Re: [v1,4/4] drm/rockchip: cdn-dp: add cdn DP support for rk3399

From: Guenter Roeck
Date: Wed Jun 08 2016 - 18:14:20 EST

On Fri, Jun 03, 2016 at 11:15:11PM +0800, Chris Zhong wrote:
> Add support for cdn DP controller which is embedded in the rk3399
> SoCs. The DP is compliant with DisplayPort Specification,
> Version 1.3, This IP is compatible with the rockchip type-c PHY IP.
> There is a uCPU in DP controller, it need a firmware to work,
> please put the firmware file to /lib/firmware/cdn/dptx.bin. The
> uCPU in charge of aux communication and link training, the host use
> mailbox to communicate with the ucpu.
> The dclk pin_pol of vop must not be invert for DP.
>
> Signed-off-by: Chris Zhong <zyw@xxxxxxxxxxxxxx>

Disclaimer: I am not familiar with drm code, so this is a very generic review,
and it may miss some (or lots of) problems.

> ---
>
> Changes in v1:
> - use extcon API
> - use hdmi-codec for the DP Asoc
> - do not initialize the "ret"
> - printk a err log when drm_of_encoder_active_endpoint_id
> - modify the dclk pin_pol to a single line
>
> drivers/gpu/drm/rockchip/Kconfig | 9 +
> drivers/gpu/drm/rockchip/Makefile | 1 +
> drivers/gpu/drm/rockchip/cdn-dp-core.c | 709 +++++++++++++++++++++++++++
> drivers/gpu/drm/rockchip/cdn-dp-core.h | 110 +++++
> drivers/gpu/drm/rockchip/cdn-dp-reg.c | 721 ++++++++++++++++++++++++++++
> drivers/gpu/drm/rockchip/cdn-dp-reg.h | 404 ++++++++++++++++
> drivers/gpu/drm/rockchip/rockchip_drm_vop.c | 6 +-
> drivers/gpu/drm/rockchip/rockchip_drm_vop.h | 2 +
> drivers/gpu/drm/rockchip/rockchip_vop_reg.c | 2 +
> 9 files changed, 1963 insertions(+), 1 deletion(-)
> create mode 100644 drivers/gpu/drm/rockchip/cdn-dp-core.c
> create mode 100644 drivers/gpu/drm/rockchip/cdn-dp-core.h
> create mode 100644 drivers/gpu/drm/rockchip/cdn-dp-reg.c
> create mode 100644 drivers/gpu/drm/rockchip/cdn-dp-reg.h
>
> diff --git a/drivers/gpu/drm/rockchip/Kconfig b/drivers/gpu/drm/rockchip/Kconfig
> index d30bdc3..20da9a8 100644
> --- a/drivers/gpu/drm/rockchip/Kconfig
> +++ b/drivers/gpu/drm/rockchip/Kconfig
> @@ -25,6 +25,15 @@ config ROCKCHIP_ANALOGIX_DP
> for the Analogix Core DP driver. If you want to enable DP
> on RK3288 based SoC, you should selet this option.
>
> +config ROCKCHIP_CDN_DP
> + tristate "Rockchip cdn DP"
> + depends on DRM_ROCKCHIP
> + help
> + This selects support for Rockchip SoC specific extensions
> + for the cdn Dp driver. If you want to enable Dp on
> + RK3399 based SoC, you should selet this
> + option.
> +
> config ROCKCHIP_DW_HDMI
> tristate "Rockchip specific extensions for Synopsys DW HDMI"
> depends on DRM_ROCKCHIP
> diff --git a/drivers/gpu/drm/rockchip/Makefile b/drivers/gpu/drm/rockchip/Makefile
> index 05d0713..abdecd5 100644
> --- a/drivers/gpu/drm/rockchip/Makefile
> +++ b/drivers/gpu/drm/rockchip/Makefile
> @@ -7,6 +7,7 @@ rockchipdrm-y := rockchip_drm_drv.o rockchip_drm_fb.o \
> rockchipdrm-$(CONFIG_DRM_FBDEV_EMULATION) += rockchip_drm_fbdev.o
>
> obj-$(CONFIG_ROCKCHIP_ANALOGIX_DP) += analogix_dp-rockchip.o
> +obj-$(CONFIG_ROCKCHIP_CDN_DP) += cdn-dp-core.o cdn-dp-reg.o
>
> Please make sure that this builds with CONFIG_ROCKCHIP_CDN_DP=m.
> Hint: Probably it won't build, because it will generate two modules,
> and the global functions are not exported.
>
> obj-$(CONFIG_ROCKCHIP_DW_HDMI) += dw_hdmi-rockchip.o
> obj-$(CONFIG_ROCKCHIP_DW_MIPI_DSI) += dw-mipi-dsi.o
> obj-$(CONFIG_ROCKCHIP_INNO_HDMI) += inno_hdmi.o
> diff --git a/drivers/gpu/drm/rockchip/cdn-dp-core.c b/drivers/gpu/drm/rockchip/cdn-dp-core.c
> new file mode 100644
> index 0000000..d51e65a
> --- /dev/null
> +++ b/drivers/gpu/drm/rockchip/cdn-dp-core.c
> @@ -0,0 +1,709 @@
> +/*
> + * Copyright (C) Fuzhou Rockchip Electronics Co.Ltd
> + * Author: Chris Zhong <zyw@xxxxxxxxxxxxxx>
> + *
> + * This software is licensed under the terms of the GNU General Public
> + * License version 2, as published by the Free Software Foundation, and
> + * may be copied, distributed, and modified under those terms.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <drm/drmP.h>
> +#include <drm/drm_atomic_helper.h>
> +#include <drm/drm_crtc_helper.h>
> +#include <drm/drm_dp_helper.h>
> +#include <drm/drm_edid.h>
> +#include <drm/drm_of.h>
> +
> +#include <linux/component.h>
> +#include <linux/clk.h>

Alphabetic order

> +#include <linux/extcon.h>
> +#include <linux/firmware.h>
> +#include <linux/mfd/syscon.h>
> +#include <linux/phy/phy.h>
> +#include <linux/phy/phy-rockchip-typec.h>
> +#include <linux/regmap.h>
> +#include <linux/reset.h>
> +#include <sound/hdmi-codec.h>
> +
> +#include <video/of_videomode.h>
> +#include <video/videomode.h>
> +
> +#include "rockchip_drm_vop.h"
> +#include "cdn-dp-reg.h"
> +#include "cdn-dp-core.h"
> +

Alphabetic order

> +#define connector_to_dp(c) \
> + container_of(c, struct cdn_dp_device, connector)
> +
> +#define encoder_to_dp(c) \
> + container_of(c, struct cdn_dp_device, encoder)
> +
> +/* dp grf register offset */
> +#define DP_VOP_SEL 0x6224
> +#define DP_SEL_VOP_LIT BIT(12)
> +
> +static int cdn_dp_clk_enable(struct cdn_dp_device *dp)
> +{
> + int ret;
> + int clk_rate = 200000000;
> +
> + ret = clk_prepare_enable(dp->pclk);
> + if (ret < 0) {
> + dev_err(dp->dev, "cannot enable dp pclk %d\n", ret);

This results in double error message. Either log here or in the calling code,
but not in both places.

> + goto err_pclk;
> + }
> +
> + ret = clk_prepare_enable(dp->core_clk);
> + if (ret < 0) {
> + dev_err(dp->dev, "cannot enable core_clk %d\n", ret);
> + goto err_core_clk;
> + }
> +
> + ret = clk_set_rate(dp->core_clk, clk_rate);
> + if (ret < 0) {
> + dev_err(dp->dev, "cannot set dp core clk to %d %d\n",
> + clk_rate, ret);
> + goto err_set_rate;
> + }
> +
> + /* notice fw the clk freq value */
> + cdn_dp_set_fw_clk(dp, clk_rate);
> +

I would suggest to use a define instead of a variable for clk_rate.

> + return 0;
> +
> +err_set_rate:
> + clk_disable_unprepare(dp->core_clk);
> +err_core_clk:
> + clk_disable_unprepare(dp->pclk);
> +err_pclk:
> + return ret;
> +}
> +
> +static enum drm_connector_status
> +cdn_dp_connector_detect(struct drm_connector *connector, bool force)
> +{
> + struct cdn_dp_device *dp = connector_to_dp(connector);
> + int ret;
> +
> + if (!dp->fw_loaded)
> + return connector_status_unknown;
> +
> + ret = cdn_dp_get_hpd_status(dp);
> + if (ret < 0)
> + return connector_status_unknown;
> +
> + return ret ? connector_status_connected : connector_status_disconnected;
> +}
> +
> +static void cdn_dp_connector_destroy(struct drm_connector *connector)
> +{
> + drm_connector_unregister(connector);
> + drm_connector_cleanup(connector);
> +}
> +
> +static struct drm_connector_funcs cdn_dp_atomic_connector_funcs = {
> + .dpms = drm_atomic_helper_connector_dpms,
> + .detect = cdn_dp_connector_detect,
> + .destroy = cdn_dp_connector_destroy,
> + .fill_modes = drm_helper_probe_single_connector_modes,
> + .reset = drm_atomic_helper_connector_reset,
> + .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
> + .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
> +};
> +
> +static int cdn_dp_connector_get_modes(struct drm_connector *connector)
> +{
> + struct cdn_dp_device *dp = connector_to_dp(connector);
> + struct edid *edid;
> + int ret;
> +
> + if (!dp->fw_loaded)
> + return 0;
> +
> + ret = cdn_dp_set_host_cap(dp);
> + if (ret) {
> + dev_err(dp->dev, "set host capabilities failed:%d\n", ret);
> + return ret;
> + }
> +
> + edid = drm_do_get_edid(connector, cdn_dp_get_edid_block, dp);
> + if (edid) {
> + dev_dbg(dp->dev, "got edid: width[%d] x height[%d]\n",
> + edid->width_cm, edid->height_cm);
> +
> + dp->sink_has_audio = drm_detect_monitor_audio(edid);
> + drm_mode_connector_update_edid_property(connector, edid);
> + drm_add_edid_modes(connector, edid);
> + /* Store the ELD */
> + drm_edid_to_eld(connector, edid);
> + kfree(edid);
> + } else {
> + dev_dbg(dp->dev, "failed to get edid\n");
> + }
> +
> + /*
> + * put the training process here, since the mode_valid need the
> + * training result to check if the resolution is support.
> + */
> + ret = cdn_dp_training_start(dp);
> + if (ret) {
> + dev_err(dp->dev, "hw lt err:%d\n", ret);
> + return ret;
> + }
> +
> + ret = cdn_dp_get_lt_status(dp);
> + if (ret) {
> + dev_err(dp->dev, "hw lt get status err:%d\n", ret);
> + return ret;
> + }
> +
> + dev_info(dp->dev, "rate:%d, lanes:%d\n",
> + dp->link.rate, dp->link.num_lanes);
> + return 0;
> +}
> +
> +static struct drm_encoder *
> + cdn_dp_connector_best_encoder(struct drm_connector *connector)
> +{
> + struct cdn_dp_device *dp = connector_to_dp(connector);
> +
> + return &dp->encoder;
> +}
> +
> +static int cdn_dp_connector_mode_valid(struct drm_connector *connector,
> + struct drm_display_mode *mode)
> +{
> + struct cdn_dp_device *dp = connector_to_dp(connector);
> + struct drm_display_info *display_info = &dp->connector.display_info;
> + long requested = mode->clock * display_info->bpc * 3 / 1000;
> + long actual, rate;
> +
> + rate = drm_dp_bw_code_to_link_rate(dp->link.rate);
> + actual = rate * dp->link.num_lanes / 100;
> +
> + /* efficiency is about 0.8 */
> + actual = actual * 8 / 10;
> +
> + if (requested > actual) {
> + dev_dbg(dp->dev, "requested=%ld, actual=%ld, clock=%d, bpc= %d\n",
> + requested, actual, mode->clock, display_info->bpc);
> + return MODE_H_ILLEGAL;
> + }
> +
> + return MODE_OK;
> +}
> +
> +static struct drm_connector_helper_funcs cdn_dp_connector_helper_funcs = {
> + .get_modes = cdn_dp_connector_get_modes,
> + .best_encoder = cdn_dp_connector_best_encoder,
> + .mode_valid = cdn_dp_connector_mode_valid,
> +};
> +
> +static int cdn_dp_commit(struct drm_encoder *encoder)
> +{

Return value is not checked.

> + struct cdn_dp_device *dp = encoder_to_dp(encoder);
> + int ret;
> +
> + cdn_dp_set_video_status(dp, CONTROL_VIDEO_IDLE);
> +
> + ret = cdn_dp_config_video(dp);
> + if (ret) {
> + dev_err(dp->dev, "unable to config video\n");
> + return ret;
> + }

The called code never returns an error, and the return value isn't checked.
So neither the error message nor the error return add any value.

> +
> + cdn_dp_set_video_status(dp, CONTROL_VIDEO_VALID);
> + dp->dpms_mode = DRM_MODE_DPMS_ON;
> +
> + return ret;
> +}
> +
> +static void cdn_dp_encoder_mode_set(struct drm_encoder *encoder,
> + struct drm_display_mode *mode,
> + struct drm_display_mode *adjusted)
> +{
> + struct cdn_dp_device *dp = encoder_to_dp(encoder);
> + struct drm_display_info *display_info = &dp->connector.display_info;
> + struct rockchip_crtc_state *state;
> + struct video_info *video = &dp->video_info;
> + int ret, val;
> +
> + switch (display_info->bpc) {
> + case 16:
> + case 12:
> + case 10:
> + video->color_depth = 10;
> + break;
> + case 6:
> + video->color_depth = 6;
> + break;
> + default:
> + video->color_depth = 8;
> + break;
> + }
> +
> + video->color_fmt = PXL_RGB;
> +
> + video->v_sync_polarity = !!(mode->flags & DRM_MODE_FLAG_NVSYNC);
> + video->h_sync_polarity = !!(mode->flags & DRM_MODE_FLAG_NHSYNC);
> +
> + ret = drm_of_encoder_active_endpoint_id(dp->dev->of_node, encoder);
> + if (ret < 0) {
> + dev_err(dp->dev, "Could not get vop id, %d", ret);
> + return;
> + }
> +
> + state = to_rockchip_crtc_state(encoder->crtc->state);
> + if (ret) {
> + val = DP_SEL_VOP_LIT | (DP_SEL_VOP_LIT << 16);
> + state->output_mode = ROCKCHIP_OUT_MODE_P888;
> + } else {
> + val = DP_SEL_VOP_LIT << 16;
> + state->output_mode = ROCKCHIP_OUT_MODE_AAAA;
> + }
> + ret = regmap_write(dp->grf, DP_VOP_SEL, val);
> + if (ret != 0)
> + dev_err(dp->dev, "Could not write to GRF: %d\n", ret);
> +
> + memcpy(&dp->mode, adjusted, sizeof(*mode));
> +}
> +
> +static void cdn_dp_encoder_enable(struct drm_encoder *encoder)
> +{
> + struct cdn_dp_device *dp = encoder_to_dp(encoder);
> +
> + if (dp->dpms_mode == DRM_MODE_DPMS_ON)
> + return;
> +
> + cdn_dp_commit(encoder);

Or
if (dp->dpms_mode != DRM_MODE_DPMS_ON)
cdn_dp_commit(encoder);

> +}
> +
> +static void cdn_dp_encoder_disable(struct drm_encoder *encoder)
> +{
> + struct cdn_dp_device *dp = encoder_to_dp(encoder);
> +
> + if (dp->dpms_mode != DRM_MODE_DPMS_ON)
> + return;
> +
> + cdn_dp_set_video_status(dp, CONTROL_VIDEO_IDLE);
> +
> + dp->dpms_mode = DRM_MODE_DPMS_OFF;

Same as above.

> +}
> +
> +static int
> +cdn_dp_encoder_atomic_check(struct drm_encoder *encoder,
> + struct drm_crtc_state *crtc_state,
> + struct drm_connector_state *conn_state)
> +{
> + struct rockchip_crtc_state *s = to_rockchip_crtc_state(crtc_state);
> +
> + s->output_mode = ROCKCHIP_OUT_MODE_AAAA;
> + s->output_type = DRM_MODE_CONNECTOR_DisplayPort;
> +
> + return 0;
> +}
> +
> +static struct drm_encoder_helper_funcs cdn_dp_encoder_helper_funcs = {
> + .mode_set = cdn_dp_encoder_mode_set,
> + .enable = cdn_dp_encoder_enable,
> + .disable = cdn_dp_encoder_disable,
> + .atomic_check = cdn_dp_encoder_atomic_check,
> +};
> +
> +static struct drm_encoder_funcs cdn_dp_encoder_funcs = {
> + .destroy = drm_encoder_cleanup,
> +};
> +
> +static int cdn_dp_firmware_init(struct cdn_dp_device *dp)
> +{
> + int ret;
> + const u32 *iram_data, *dram_data;
> + const struct firmware *fw;
> + const struct cdn_firmware_header *hdr;
> +
> + if (dp->fw_loaded)
> + return 0;
> +
> + ret = request_firmware(&fw, "cdn/dptx.bin", dp->dev);
> + if (ret < 0) {
> + dev_err(dp->dev, "failed to request firmware %d\n", ret);
> + return ret;
> + }
> +
> + hdr = (struct cdn_firmware_header *)fw->data;
> + if (fw->size != le32_to_cpu(hdr->size_bytes))
> + return -EINVAL;
> +
> + ret = cdn_dp_clk_enable(dp);
> + if (ret < 0) {
> + dev_err(dp->dev, "cannot enable dp clk %d\n", ret);
> + return ret;
> + }
> +
> + dp_clock_reset_seq(dp);
> +
> + iram_data = (const u32 *)(fw->data + hdr->header_size);
> + dram_data = (const u32 *)(fw->data + hdr->header_size + hdr->iram_size);

No need for endianness conversion here ?

> +
> + ret = cdn_dp_load_firmware(dp,
> + iram_data, hdr->iram_size,
> + dram_data, hdr->dram_size);
> +
> + ret = cdn_dp_active(dp, true);
> + if (ret) {
> + dev_err(dp->dev, "active ucpu failed: %d\n", ret);
> + return ret;
> + }
> +
> + cdn_dp_event_config(dp);
> +

Ignored error return code.

> + return 0;
> +}
> +
> +static int cdn_dp_init(struct cdn_dp_device *dp)
> +{
> + struct device *dev = dp->dev;
> + struct device_node *np = dev->of_node;
> + struct platform_device *pdev = to_platform_device(dev);
> + struct resource *res;
> +
> + dp->grf = syscon_regmap_lookup_by_phandle(np, "rockchip,grf");
> + if (IS_ERR(dp->grf)) {
> + dev_err(dev, "cdn-dp needs rockchip,grf property\n");
> + return PTR_ERR(dp->grf);
> + }
> +
> + dp->irq = platform_get_irq(pdev, 0);
> + if (dp->irq < 0) {
> + dev_err(dev, "cdn-dp can not get irq\n");
> + return dp->irq;
> + }
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + dp->regs = devm_ioremap_resource(dev, res);
> + if (IS_ERR(dp->regs)) {
> + dev_err(dev, "ioremap reg failed\n");
> + return PTR_ERR(dp->regs);
> + }
> +
> + dp->core_clk = devm_clk_get(dev, "core_clk");
> + if (IS_ERR(dp->core_clk)) {
> + dev_err(dev, "cannot get core_clk_dp\n");
> + return PTR_ERR(dp->core_clk);
> + }
> +
> + dp->pclk = devm_clk_get(dev, "pclk");
> + if (IS_ERR(dp->pclk)) {
> + dev_err(dev, "cannot get pclk\n");
> + return PTR_ERR(dp->pclk);
> + }
> +
> + dp->spdif_clk = devm_clk_get(dev, "spdif");
> + if (IS_ERR(dp->spdif_clk)) {
> + dev_err(dev, "cannot get spdif_clk\n");
> + return PTR_ERR(dp->spdif_clk);
> + }
> +
> + dp->dpms_mode = DRM_MODE_DPMS_OFF;
> +
> + dev_set_name(dp->dev, "cdn-dp");
> +

Unusual. Why is this necessary ?

> + return 0;
> +}
> +
> +static int cdn_dp_audio_hw_params(struct device *dev,
> + struct hdmi_codec_daifmt *daifmt,
> + struct hdmi_codec_params *params)
> +{
> + struct cdn_dp_device *dp = dev_get_drvdata(dev);
> + int ret;
> + struct audio_info audio = {
> + .sample_width = params->sample_width,
> + .sample_rate = params->sample_rate,
> + .channels = params->channels,
> + };
> +
> + if (!dp->encoder.crtc)
> + return -ENODEV;
> +
> + switch (daifmt->fmt) {
> + case HDMI_I2S:
> + audio.format = AFMT_I2S;
> + break;
> + case HDMI_SPDIF:
> + audio.format = AFMT_SPDIF;
> + break;
> + default:
> + dev_err(dev, "%s: Invalid format %d\n", __func__, daifmt->fmt);
> + return -EINVAL;
> + }
> +
> + ret = cdn_dp_audio_config_set(dp, &audio);
> + if (ret == 0)
> + dp->audio_info = audio;
> +
> + return ret;
> +}
> +
> +static void cdn_dp_audio_shutdown(struct device *dev)
> +{
> + struct cdn_dp_device *dp = dev_get_drvdata(dev);
> +
> + cdn_dp_audio_stop(dp, &dp->audio_info);
> +
> + dp->audio_info.format = AFMT_UNUSED;
> +}
> +
> +static int cdn_dp_audio_digital_mute(struct device *dev, bool enable)
> +{
> + struct cdn_dp_device *dp = dev_get_drvdata(dev);
> +
> + cdn_dp_audio_mute(dp, enable);
> +
> + return 0;
> +}
> +
> +static int cdn_dp_audio_get_eld(struct device *dev, uint8_t *buf, size_t len)
> +{
> + struct cdn_dp_device *dp = dev_get_drvdata(dev);
> + struct drm_mode_config *config = &dp->encoder.dev->mode_config;
> + struct drm_connector *connector;
> + int ret = -ENODEV;
> +
> + mutex_lock(&config->mutex);
> + list_for_each_entry(connector, &config->connector_list, head) {
> + if (&dp->encoder == connector->encoder) {
> + memcpy(buf, connector->eld,
> + min(sizeof(connector->eld), len));
> + ret = 0;
> + }
> + }
> + mutex_unlock(&config->mutex);
> +
> + return ret;
> +}
> +
> +static const struct hdmi_codec_ops audio_codec_ops = {
> + .hw_params = cdn_dp_audio_hw_params,
> + .audio_shutdown = cdn_dp_audio_shutdown,
> + .digital_mute = cdn_dp_audio_digital_mute,
> + .get_eld = cdn_dp_audio_get_eld,
> +};
> +
> +static int cdn_dp_audio_codec_init(struct cdn_dp_device *dp,
> + struct device *dev)
> +{
> + struct hdmi_codec_pdata codec_data = {
> + .i2s = 1,
> + .spdif = 1,
> + .ops = &audio_codec_ops,
> + .max_i2s_channels = 8,
> + };
> +
> + dp->audio_pdev = platform_device_register_data(
> + dev, HDMI_CODEC_DRV_NAME, PLATFORM_DEVID_AUTO,
> + &codec_data, sizeof(codec_data));
> +
> + return PTR_ERR_OR_ZERO(dp->audio_pdev);
> +}
> +
> +static int cdn_dp_pd_event(struct notifier_block *nb,
> + unsigned long event, void *priv)
> +{
> + struct cdn_dp_device *dp;
> + struct extcon_dev *edev = (struct extcon_dev *)priv;
> + int value = edev->state;
> + u8 map;
> +
> + dp = container_of(nb, struct cdn_dp_device, event_nb);
> +
> + map = GET_PIN_MAP(value);
> +
> + /*
> + * if the old state is not plugged, and the map is 0, the device is
> + * certainly not DP.
> + */
> + if (!map && !dp->plugged)
> + return 0;
> +
> + dp->plugged = GET_PLUGGED(value);
> + dp->flip = GET_FLIP(value);
> +
> + if (map & (PIN_MAP_B | PIN_MAP_D | PIN_MAP_F))
> + dp->cap_lanes = 2;
> + else
> + dp->cap_lanes = 4;
> +
> + schedule_delayed_work_on(0, &dp->event_wq, 100);

Hardcoded time (in jiffies) is unusual. Better would be a time relative to HZ.

> +
> + return 0;
> +}
> +
> +static void cdn_dp_pd_event_wq(struct work_struct *work)
> +{
> + struct cdn_dp_device *dp;
> +
> + dp = container_of(work, struct cdn_dp_device, event_wq.work);
> +
> + if (cdn_dp_firmware_init(dp))
> + return;
> +
> + if ((cdn_dp_get_event(dp) & DPTX_HPD_EVENT) && (dp->drm_dev))

Unnecessary () around dp->drm_dev

> + drm_helper_hpd_irq_event(dp->drm_dev);
> +}
> +
> +static int cdn_dp_bind(struct device *dev, struct device *master,
> + void *data)
> +{
> + struct cdn_dp_device *dp = dev_get_drvdata(dev);
> + struct device_node *np = dev->of_node;
> + struct drm_encoder *encoder;
> + struct drm_connector *connector;
> + struct drm_device *drm_dev = data;
> + struct phy *phy = devm_of_phy_get_by_index(dev, np, 0);
> + int ret;
> +
> + if (IS_ERR(phy))
> + return -EPROBE_DEFER;
> +
> + dp->phy = phy;
> +
> + ret = cdn_dp_init(dp);
> + if (ret < 0)
> + return ret;
> +
> + dp->drm_dev = drm_dev;
> +
> + encoder = &dp->encoder;
> +
> + encoder->possible_crtcs = drm_of_find_possible_crtcs(drm_dev,
> + dev->of_node);
> + DRM_DEBUG_KMS("possible_crtcs = 0x%x\n", encoder->possible_crtcs);
> +
> + ret = drm_encoder_init(drm_dev, encoder, &cdn_dp_encoder_funcs,
> + DRM_MODE_ENCODER_TMDS, NULL);
> + if (ret) {
> + DRM_ERROR("failed to initialize encoder with drm\n");
> + return ret;
> + }
> +
> + drm_encoder_helper_add(encoder, &cdn_dp_encoder_helper_funcs);
> +
> + connector = &dp->connector;
> + connector->polled = DRM_CONNECTOR_POLL_HPD;
> + connector->dpms = DRM_MODE_DPMS_OFF;
> +
> + ret = drm_connector_init(drm_dev, connector,
> + &cdn_dp_atomic_connector_funcs,
> + DRM_MODE_CONNECTOR_DisplayPort);
> + if (ret) {
> + DRM_ERROR("failed to initialize connector with drm\n");
> + goto err_free_encoder;
> + }
> +
> + drm_connector_helper_add(connector, &cdn_dp_connector_helper_funcs);
> +
> + ret = drm_mode_connector_attach_encoder(connector, encoder);
> + if (ret) {
> + DRM_ERROR("failed to attach connector and encoder\n");
> + goto err_free_connector;
> + }
> +
> + cdn_dp_audio_codec_init(dp, dev);
> +
> + dp->event_nb.notifier_call = cdn_dp_pd_event;
> + INIT_DELAYED_WORK(&dp->event_wq, cdn_dp_pd_event_wq);
> + ret = extcon_register_notifier(dp->extcon, EXTCON_USB,
> + &dp->event_nb);
> + if (ret) {
> + dev_err(dev, "regitster notifer failed\n");
> + return ret;
> + }
> +
> + return 0;
> +
> +err_free_connector:
> + drm_connector_cleanup(connector);
> +err_free_encoder:
> + drm_encoder_cleanup(encoder);
> + return ret;
> +}
> +
> +static void cdn_dp_unbind(struct device *dev, struct device *master, void *data)
> +{
> + struct cdn_dp_device *dp = dev_get_drvdata(dev);
> + struct drm_encoder *encoder = &dp->encoder;
> +
> + platform_device_unregister(dp->audio_pdev);
> + cdn_dp_encoder_disable(encoder);
> + encoder->funcs->destroy(encoder);
> + drm_connector_unregister(&dp->connector);
> + drm_connector_cleanup(&dp->connector);
> + drm_encoder_cleanup(encoder);
> +
> + extcon_unregister_notifier(dp->extcon, EXTCON_USB,
> + &dp->event_nb);
> +}
> +
> +static const struct component_ops cdn_dp_component_ops = {
> + .bind = cdn_dp_bind,
> + .unbind = cdn_dp_unbind,
> +};
> +
> +static int cdn_dp_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct cdn_dp_device *dp;
> +
> + dp = devm_kzalloc(dev, sizeof(*dp), GFP_KERNEL);
> + if (!dp)
> + return -ENOMEM;
> + dp->dev = dev;
> +
> + dp->extcon = extcon_get_edev_by_phandle(dev, 0);
> + if (IS_ERR(dp->extcon)) {
> + if (PTR_ERR(dp->extcon) == -EPROBE_DEFER)
> + return -EPROBE_DEFER;
> + dev_err(dev, "Invalid or missing extcon\n");
> + return PTR_ERR(dp->extcon);
> + }
> +
> + platform_set_drvdata(pdev, dp);
> +

There is no platform_get_drvdata(). Is this needed ?

> + return component_add(dev, &cdn_dp_component_ops);
> +}
> +
> +static int cdn_dp_remove(struct platform_device *pdev)
> +{
> + component_del(&pdev->dev, &cdn_dp_component_ops);
> +
> + return 0;
> +}
> +
> +static const struct of_device_id cdn_dp_dt_ids[] = {
> + {.compatible = "rockchip,cdn-dp",},
> + {}
> +};
> +
> +MODULE_DEVICE_TABLE(of, cdn_dp_dt_ids);
> +
> +static struct platform_driver cdn_dp_driver = {
> + .probe = cdn_dp_probe,
> + .remove = cdn_dp_remove,
> + .driver = {
> + .name = "cdn-dp",
> + .owner = THIS_MODULE,
> + .of_match_table = of_match_ptr(cdn_dp_dt_ids),
> + },
> +};
> +
> +module_platform_driver(cdn_dp_driver);
> +
> +MODULE_AUTHOR("Chris Zhong <zyw@xxxxxxxxxxxxxx>");
> +MODULE_DESCRIPTION("cdn DP Driver");
> +MODULE_LICENSE("GPL v2");
> diff --git a/drivers/gpu/drm/rockchip/cdn-dp-core.h b/drivers/gpu/drm/rockchip/cdn-dp-core.h
> new file mode 100644
> index 0000000..3741c92
> --- /dev/null
> +++ b/drivers/gpu/drm/rockchip/cdn-dp-core.h
> @@ -0,0 +1,110 @@
> +/*
> + * Copyright (C) 2016 Chris Zhong <zyw@xxxxxxxxxxxxxx>
> + * Copyright (C) 2016 ROCKCHIP, Inc.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#ifndef _ROCKCHIP_EDP_CORE_H
> +#define _ROCKCHIP_EDP_CORE_H
> +
> +#include <drm/drmP.h>
> +#include <drm/drm_crtc_helper.h>
> +#include <drm/drm_dp_helper.h>
> +#include <drm/drm_panel.h>
> +#include "rockchip_drm_drv.h"
> +#include "cdn-dp-reg.h"
> +
> +enum AUDIO_FORMAT {
> + AFMT_I2S = 0,
> + AFMT_SPDIF = 1,
> + AFMT_UNUSED,
> +};
> +
> +struct audio_info {
> + enum AUDIO_FORMAT format;
> + int sample_rate;
> + int channels;
> + int sample_width;
> +};
> +
> +struct video_info {
> + bool h_sync_polarity;
> + bool v_sync_polarity;
> + bool interlaced;
> + int color_depth;
> + enum VIC_PXL_ENCODING_FORMAT color_fmt;
> +};
> +
> +struct cdn_firmware_header {
> + u32 size_bytes; /* size of the entire header+image(s) in bytes */
> + u32 header_size; /* size of just the header in bytes */
> + u32 iram_size; /* size of iram */
> + u32 dram_size; /* size of dram */
> +};
> +
> +struct cdn_dp_device {
> + struct device *dev;
> + struct drm_device *drm_dev;
> + struct drm_connector connector;
> + struct drm_encoder encoder;
> + struct drm_display_mode mode;
> + struct delayed_work hotplug_work;
> + struct platform_device *audio_pdev;
> + bool plugged;
> +
> + const struct firmware *fw; /* cdn dp firmware */
> + unsigned int fw_version; /* cdn fw version */
> + bool fw_loaded;
> + void __iomem *regs;
> + void __iomem *phy_regs;
> + struct regmap *grf;
> + unsigned int irq;
> + struct clk *core_clk;
> + struct clk *pclk;
> + struct clk *spdif_clk;
> + struct audio_info audio_info;
> + struct video_info video_info;
> + struct phy *phy;
> + struct extcon_dev *extcon;
> + struct notifier_block event_nb;
> + struct delayed_work event_wq;
> +
> + int cap_lanes;
> + bool flip;
> +
> + int dpms_mode;
> + struct drm_dp_link link;
> + bool sink_has_audio;
> +};
> +
> +void dp_clock_reset_seq(struct cdn_dp_device *dp);
> +
> +void cdn_dp_set_fw_clk(struct cdn_dp_device *dp, int clk);
> +int cdn_dp_load_firmware(struct cdn_dp_device *dp, const u32 *i_mem,
> + u32 i_size, const u32 *d_mem, u32 d_size);
> +int cdn_dp_active(struct cdn_dp_device *dp, u8 enable);
> +int cdn_dp_set_host_cap(struct cdn_dp_device *dp);
> +int cdn_dp_event_config(struct cdn_dp_device *dp);
> +int cdn_dp_get_event(struct cdn_dp_device *dp);
> +int cdn_dp_get_hpd_status(struct cdn_dp_device *dp);
> +int cdn_dp_dpcd_write(struct cdn_dp_device *dp, u32 addr, u8 value);
> +int cdn_dp_dpcd_read(struct cdn_dp_device *dp, u32 addr);
> +int cdn_dp_get_edid_block(void *dp, u8 *edid,
> + unsigned int block, size_t length);
> +int cdn_dp_training_start(struct cdn_dp_device *dp);
> +int cdn_dp_get_lt_status(struct cdn_dp_device *dp);
> +int cdn_dp_set_video_status(struct cdn_dp_device *dp, int active);
> +int cdn_dp_config_video(struct cdn_dp_device *dp);
> +int cdn_dp_audio_stop(struct cdn_dp_device *dp, struct audio_info *audio);
> +int cdn_dp_audio_mute(struct cdn_dp_device *dp, bool enable);
> +int cdn_dp_audio_config_set(struct cdn_dp_device *dp, struct audio_info *audio);
> +
> +#endif /* _ROCKCHIP_EDP_CORE_H */
> diff --git a/drivers/gpu/drm/rockchip/cdn-dp-reg.c b/drivers/gpu/drm/rockchip/cdn-dp-reg.c
> new file mode 100644
> index 0000000..3b64e95
> --- /dev/null
> +++ b/drivers/gpu/drm/rockchip/cdn-dp-reg.c
> @@ -0,0 +1,721 @@
> +/*
> + * Copyright (C) Fuzhou Rockchip Electronics Co.Ltd
> + * Author: Chris Zhong <zyw@xxxxxxxxxxxxxx>
> + *
> + * This software is licensed under the terms of the GNU General Public
> + * License version 2, as published by the Free Software Foundation, and
> + * may be copied, distributed, and modified under those terms.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/device.h>
> +#include <linux/delay.h>
> +#include <linux/io.h>
> +#include <linux/iopoll.h>
> +#include <linux/reset.h>
> +
> +#include "cdn-dp-core.h"
> +#include "cdn-dp-reg.h"
> +
> +#define FW_ALIVE_TIMEOUT_US 1000000
> +#define MAILBOX_TIMEOUT_US 5000000
> +
> +/* the max size of read buff is 134 */
> +static u8 rx_buff[134];
> +

Are all accesses to this buffer mutex or spinlock protected,
or guaranteed to be sequential ?

> +void cdn_dp_set_fw_clk(struct cdn_dp_device *dp, int clk)
> +{
> + writel(clk / 1000000, dp->regs + SW_CLK_H);
> +}
> +
> +void dp_clock_reset_seq(struct cdn_dp_device *dp)
> +{
> + writel(0xfff, dp->regs + SOURCE_DPTX_CAR);
> + writel(0x7, dp->regs + SOURCE_PHY_CAR);
> + writel(0xf, dp->regs + SOURCE_PKT_CAR);
> + writel(0xff, dp->regs + SOURCE_AIF_CAR);
> + writel(0xf, dp->regs + SOURCE_CIPHER_CAR);
> + writel(0x3, dp->regs + SOURCE_CRYPTO_CAR);
> + writel(0, dp->regs + APB_INT_MASK);
> +}
> +
> +static u8 cdn_dp_mailbox_read(struct cdn_dp_device *dp)
> +{
> + int val, ret;
> +
> + if (!dp->fw_loaded)
> + return 0;
> +
> + ret = readx_poll_timeout(readl, dp->regs + MAILBOX_EMPTY_ADDR,
> + val, !val, 1000, MAILBOX_TIMEOUT_US);
> + if (ret < 0) {
> + dev_err(dp->dev, "failed to read mailbox, keep alive = %x\n",
> + readl(dp->regs + KEEP_ALIVE));
> + return 0;

Is it ok to ignore this error ?

> + }
> +
> + return readl(dp->regs + MAILBOX0_RD_DATA) & 0xff;
> +}
> +
> +static void cdp_dp_mailbox_write(struct cdn_dp_device *dp, u8 val)
> +{
> + int ret, full;
> +
> + if (!dp->fw_loaded)
> + return;
> +
> + ret = readx_poll_timeout(readl, dp->regs + MAILBOX_FULL_ADDR,
> + full, !full, 1000, MAILBOX_TIMEOUT_US);
> + if (ret < 0) {
> + dev_err(dp->dev, "mailbox is full, keep alive = %x\n",
> + readl(dp->regs + KEEP_ALIVE));
> + return;

Is it ok to ignore errors ? The calling code supports returning errors.

> + }
> +
> + writel(val, dp->regs + MAILBOX0_WR_DATA);
> +}
> +
> +/* return the size of message */
> +int cdn_dp_mailbox_response(struct cdn_dp_device *dp, u8 module_id,
> + u8 opcode, u8 **message)
> +{
> + int size, i = 0;
> +
> + memset(rx_buff, 0, 4);
> +
> + while (i < sizeof(rx_buff)) {
> + if (i < sizeof(rx_buff))

"i < sizeof(rx_buff)" is checked twice in a row.

> + rx_buff[i++] = cdn_dp_mailbox_read(dp);
> +
> + size = ((rx_buff[2] << 8) | rx_buff[3]) + 4;
> + if (i >= size)
> + break;

Hmm ... the loop starts with index 0, so the size is filled in
the first four iterations. This should work, but it is a bit odd.

> + }
> +
> + if ((opcode != rx_buff[0]) || (module_id != rx_buff[1]))

Unnecessary ( ).

> + return -EINVAL;
> +
> + size = (rx_buff[2] << 8) | rx_buff[3];
> +
> + *message = &rx_buff[4];
> +
> + return size;
> +}
> +
> +int cdn_dp_mailbox_send(struct cdn_dp_device *dp, u8 module_id, u8 opcode,
> + u16 size, u8 *message)
> +{
> + cdp_dp_mailbox_write(dp, opcode);
> + cdp_dp_mailbox_write(dp, module_id);
> + cdp_dp_mailbox_write(dp, size >> 8);
> + cdp_dp_mailbox_write(dp, size & 0xff);
> +
> + while (size--)
> + cdp_dp_mailbox_write(dp, *message++);
> +
> + return 0;
> +}
> +
> +int cdn_dp_load_firmware(struct cdn_dp_device *dp, const u32 *i_mem,
> + u32 i_size, const u32 *d_mem, u32 d_size)
> +{
> + int i, reg, ret;
> +
> + /* reset ucpu before load firmware*/
> + writel(APB_IRAM_PATH | APB_DRAM_PATH | APB_XT_RESET,
> + dp->regs + APB_CTRL);
> +
> + for (i = 0; i < i_size; i += 4)
> + writel(*i_mem++, dp->regs + ADDR_IMEM + i);
> +
> + for (i = 0; i < d_size; i += 4)
> + writel(*d_mem++, dp->regs + ADDR_DMEM + i);
> +
> + /* un-reset ucpu */
> + writel(0, dp->regs + APB_CTRL);
> +
> + /* check the keep alive register to make sure fw working */
> + ret = readx_poll_timeout(readl, dp->regs + KEEP_ALIVE,
> + reg, reg, 2000, FW_ALIVE_TIMEOUT_US);
> + if (ret < 0) {
> + dev_err(dp->dev, "failed to loaded the FW reg = %x\n", reg);
> + return -EINVAL;
> + }
> +
> + reg = readl(dp->regs + VER_L) & 0xff;
> + dp->fw_version = reg;
> + reg = readl(dp->regs + VER_H) & 0xff;
> + dp->fw_version |= reg << 8;
> + reg = readl(dp->regs + VER_LIB_L_ADDR) & 0xff;
> + dp->fw_version |= reg << 16;
> + reg = readl(dp->regs + VER_LIB_H_ADDR) & 0xff;
> + dp->fw_version |= reg << 24;
> +
> + dp->fw_loaded = 1;
> +
> + return 0;
> +}
> +
> +int cdn_dp_reg_write(struct cdn_dp_device *dp, u16 addr, u32 val)
> +{
> + u8 msg[6];
> +
> + msg[0] = (addr >> 8) & 0xff;
> + msg[1] = addr & 0xff;
> + msg[2] = (val >> 24) & 0xff;
> + msg[3] = (val >> 16) & 0xff;
> + msg[4] = (val >> 8) & 0xff;
> + msg[5] = val & 0xff;
> + return cdn_dp_mailbox_send(dp, MB_MODULE_ID_DP_TX, DPTX_WRITE_REGISTER,
> + ARRAY_SIZE(msg), msg);
> +}
> +
> +int cdn_dp_reg_read(struct cdn_dp_device *dp, u16 addr)

Never called ?

> +{
> + u8 msg[2], *reg = NULL;
> + u16 size;
> +
> + msg[0] = (addr >> 8) & 0xff;
> + msg[1] = addr & 0xff;
> + cdn_dp_mailbox_send(dp, MB_MODULE_ID_DP_TX, DPTX_READ_REGISTER,
> + ARRAY_SIZE(msg), msg);

Sometimes the return value from this function is checked, sometimes not.
Please be consistent.

> +
> + size = cdn_dp_mailbox_response(dp, MB_MODULE_ID_DP_TX,
> + DPTX_READ_REGISTER, &reg);
> + if (size != 6)
> + return -EINVAL;

cdn_dp_mailbox_response() does return an error code, so this may result in
static checker complaints about ignored error codes.

> +
> + if ((msg[0] == reg[0]) && (msg[1] == reg[1]))
> + return (reg[2] << 24) | (reg[3] << 16) | (reg[4] << 8) | reg[5];

Unnecessary ( ).

> +
> + return -EINVAL;
> +}
> +
> +int cdn_dp_reg_write_bit(struct cdn_dp_device *dp, u16 addr, u8 start_bit,
> + u8 bits_no, u32 val)
> +{
> + u8 field[8];
> +
> + field[0] = (addr >> 8) & 0xff;
> + field[1] = addr & 0xff;
> + field[2] = start_bit;
> + field[3] = bits_no;
> + field[4] = (val >> 24) & 0xff;
> + field[5] = (val >> 16) & 0xff;
> + field[6] = (val >> 8) & 0xff;
> + field[7] = val & 0xff;
> +
> + return cdn_dp_mailbox_send(dp, MB_MODULE_ID_DP_TX, DPTX_WRITE_FIELD,
> + sizeof(field), field);
> +}
> +
> +int cdn_dp_dpcd_write(struct cdn_dp_device *dp, u32 addr, u8 value)
> +{

Never called ?

> + u8 msg[6], *reg = NULL;
> + u16 size;
> +
> + msg[0] = 0;
> + msg[1] = 1;
> + msg[2] = (addr >> 16) & 0xff;
> + msg[3] = (addr >> 8) & 0xff;
> + msg[4] = addr & 0xff;
> + msg[5] = value;
> + cdn_dp_mailbox_send(dp, MB_MODULE_ID_DP_TX, DPTX_WRITE_DPCD,
> + ARRAY_SIZE(msg), msg);
> +
> + size = cdn_dp_mailbox_response(dp, MB_MODULE_ID_DP_TX,
> + DPTX_WRITE_DPCD, &reg);
> + if (size != 5)
> + return -EINVAL;
> +
> + if ((msg[2] == reg[2]) && (msg[3] == reg[3]) && (msg[4] == reg[4]))

Unnecessary ( ).

> + return 0;
> +
> + return -EINVAL;
> +}
> +
> +int cdn_dp_dpcd_read(struct cdn_dp_device *dp, u32 addr)

Never called ?

> +{
> + u8 msg[5], *reg = NULL;
> + u16 size;
> +
> + msg[0] = 0;
> + msg[1] = 1;
> + msg[2] = (addr >> 16) & 0xff;
> + msg[3] = (addr >> 8) & 0xff;
> + msg[4] = addr & 0xff;
> + cdn_dp_mailbox_send(dp, MB_MODULE_ID_DP_TX, DPTX_READ_DPCD,
> + ARRAY_SIZE(msg), msg);
> +
> + size = cdn_dp_mailbox_response(dp, MB_MODULE_ID_DP_TX,
> + DPTX_READ_DPCD, &reg);
> + if (size != 6)
> + return -EINVAL;
> +
> + if ((msg[2] == reg[2]) && (msg[3] == reg[3]) && (msg[4] == reg[4]))

Unnecessary ( ).

> + return reg[5];
> +
> + return -EINVAL;
> +}
> +
> +int cdn_dp_active(struct cdn_dp_device *dp, u8 enable)

bool enable

> +{
> + u8 active = enable ? 1 : 0;
> + u8 *resp = NULL;
> + int size;
> +
> + /* set firmware status, 1: avtive; 0: standby */
> + cdn_dp_mailbox_send(dp, MB_MODULE_ID_GENERAL, GENERAL_MAIN_CONTROL,
> + 1, &active);
> +
> + size = cdn_dp_mailbox_response(dp, MB_MODULE_ID_GENERAL,
> + GENERAL_MAIN_CONTROL, &resp);
> + if (size != 1)
> + return -EINVAL;
> +
> + return *resp ? 0 : -EINVAL;
> +}
> +
> +int cdn_dp_set_host_cap(struct cdn_dp_device *dp)
> +{
> + u8 msg[8];
> +
> + msg[0] = DP_LINK_BW_5_4;
> + msg[1] = dp->cap_lanes;
> + msg[2] = VOLTAGE_LEVEL_2;
> + msg[3] = PRE_EMPHASIS_LEVEL_3;
> + msg[4] = PRBS7 | D10_2 | TRAINING_PTN1 | TRAINING_PTN2;
> + msg[5] = FAST_LT_NOT_SUPPORT;
> + msg[6] = LANE_MAPPING_NORMAL;
> + msg[7] = ENHANCED;
> +
> + cdn_dp_mailbox_send(dp, MB_MODULE_ID_DP_TX,
> + DPTX_SET_HOST_CAPABILITIES,
> + ARRAY_SIZE(msg), msg);
> +
> + cdn_dp_reg_write(dp, DP_AUX_SWAP_INVERSION_CONTROL, AUX_HOST_INVERT);
> +
> + return 0;
> +}
> +
> +int cdn_dp_event_config(struct cdn_dp_device *dp)
> +{
> + u8 msg[5];
> +
> + msg[0] = DPTX_EVENT_ENABLE_HPD | DPTX_EVENT_ENABLE_TRAINING;
> +
> + return cdn_dp_mailbox_send(dp, MB_MODULE_ID_DP_TX, DPTX_ENABLE_EVENT,
> + ARRAY_SIZE(msg), msg);

This sends 4 bytes of random data.

> +}
> +
> +int cdn_dp_get_event(struct cdn_dp_device *dp)
> +{
> + return readl(dp->regs + SW_EVENTS0);
> +}
> +
> +int cdn_dp_get_hpd_status(struct cdn_dp_device *dp)
> +{
> + u8 *status = NULL;
> + int size;
> +
> + cdn_dp_mailbox_send(dp, MB_MODULE_ID_DP_TX, DPTX_HPD_STATE,
> + 0, NULL);
> +
> + size = cdn_dp_mailbox_response(dp, MB_MODULE_ID_DP_TX,
> + DPTX_HPD_STATE, &status);
> + if (size != 1)
> + return -EINVAL;
> +
> + return *status;
> +}
> +
> +int cdn_dp_get_edid_block(void *data, u8 *edid,
> + unsigned int block, size_t length)
> +{
> + struct cdn_dp_device *dp = data;
> + int size;
> + u8 msg[2], *reg = NULL;
> +
> + if (length != EDID_BLOCK_SIZE)
> + return -EINVAL;
> +
> + msg[0] = block / 2;
> + msg[1] = block % 2;
> +
> + cdn_dp_mailbox_send(dp, MB_MODULE_ID_DP_TX, DPTX_GET_EDID,
> + 2, msg);
> +
> + size = cdn_dp_mailbox_response(dp, MB_MODULE_ID_DP_TX,
> + DPTX_GET_EDID, &reg);
> +
> + if (size != EDID_DATA + EDID_BLOCK_SIZE) {
> + dev_err(dp->dev, "read edid failed\n");
> + return -EINVAL;
> + }
> +
> + if ((reg[EDID_LENGTH_BYTE] != EDID_BLOCK_SIZE) ||
> + (reg[EDID_SEGMENT_BUMBER] != block / 2)) {

Unnecessary ( ).

> + dev_err(dp->dev, "edid block size err\n");
> + return -EINVAL;
> + }
> +
> + memcpy(edid, &reg[EDID_DATA], EDID_BLOCK_SIZE);
> +
> + return 0;
> +}
> +
> +int cdn_dp_training_start(struct cdn_dp_device *dp)
> +{
> + int size;
> + u8 msg, *event = NULL;
> + unsigned long timeout;
> +
> + msg = LINK_TRAINING_RUN;
> +
> + /* start training */
> + cdn_dp_mailbox_send(dp, MB_MODULE_ID_DP_TX, DPTX_TRAINING_CONTROL,
> + 1, &msg);
> +
> + /* the whole training should finish in 500ms */
> + timeout = jiffies + msecs_to_jiffies(500);
> + while (1) {
> + msleep(20);
> + cdn_dp_mailbox_send(dp, MB_MODULE_ID_DP_TX, DPTX_READ_EVENT,
> + 0, NULL);
> +
> + size = cdn_dp_mailbox_response(dp, MB_MODULE_ID_DP_TX,
> + DPTX_READ_EVENT, &event);
> + if (size != 2)
> + return -EINVAL;
> +
> + if (event[1] & EQ_PHASE_FINISHED)
> + break;
> +
> + if (time_after(jiffies, timeout))
> + return -ETIMEDOUT;
> + }
> +
> + return 0;
> +}
> +
> +int cdn_dp_get_lt_status(struct cdn_dp_device *dp)
> +{
> + u8 *status = NULL;
> + int size;
> +
> + cdn_dp_mailbox_send(dp, MB_MODULE_ID_DP_TX, DPTX_READ_LINK_STAT,
> + 0, NULL);
> +
> + size = cdn_dp_mailbox_response(dp, MB_MODULE_ID_DP_TX,
> + DPTX_READ_LINK_STAT, &status);
> +
> + if (size != 10)
> + return -EINVAL;
> +
> + dp->link.rate = status[0];
> + dp->link.num_lanes = status[1];
> +
> + return 0;
> +}
> +
> +int cdn_dp_set_video_status(struct cdn_dp_device *dp, int active)
> +{

Return value isn't checked, and the function never returns an error...

> + u8 msg;
> +
> + msg = !!active;
> +
> + cdn_dp_mailbox_send(dp, MB_MODULE_ID_DP_TX, DPTX_SET_VIDEO,
> + 1, &msg);

... because the return value from cdn_dp_mailbox_send() isn't checked.
> +
> + return 0;
> +}
> +
> +int cdn_dp_set_audio_status(struct cdn_dp_device *dp, int active)
> +{

Never called. Please check and ensure that all functions are either needed
or dropped. If the plan is to use the functions later, please introduce them
when needed / called.

> + u8 msg;
> +
> + msg = !!active;
> +
> + cdn_dp_mailbox_send(dp, MB_MODULE_ID_DP_TX, DPTX_SET_AUDIO,
> + 1, &msg);
> +
> + return 0;
> +}
> +
> +static int cdn_dp_get_msa_misc(struct video_info *video,
> + struct drm_display_mode *mode)
> +{
> + u8 val0, val1;
> + u32 msa_misc;
> +
> + switch (video->color_fmt) {
> + case PXL_RGB:
> + case Y_ONLY:
> + val0 = 0;
> + break;
> + case YCBCR_4_4_4:
> + val0 = 6;
> + break;
> + case YCBCR_4_2_2:
> + val0 = 5;
> + break;
> + case YCBCR_4_2_0:
> + val0 = 5;
> + break;
> + };
> +
> + switch (video->color_depth) {
> + case 6:
> + val1 = 0;
> + break;
> + case 8:
> + val1 = 1;
> + break;
> + case 10:
> + val1 = 2;
> + break;
> + case 12:
> + val1 = 3;
> + break;
> + case 16:
> + val1 = 4;
> + break;
> + };
> +
> + msa_misc = 2 * val0 + 32 * val1 +
> + ((video->color_fmt == Y_ONLY) ? (1 << 14) : 0);
> +
> + return msa_misc;
> +}
> +
> +int cdn_dp_config_video(struct cdn_dp_device *dp)
> +{
> + struct video_info *video = &dp->video_info;
> + struct drm_display_mode *mode = &dp->mode;
> + u32 val, link_rate;
> + u8 bit_per_pix;
> +
> + bit_per_pix = (video->color_fmt == YCBCR_4_2_2) ?
> + (video->color_depth * 2) : (video->color_depth * 3);
> +
> + val = VIF_BYPASS_INTERLACE;
> +
> + cdn_dp_reg_write(dp, BND_HSYNC2VSYNC, val);
> +
> + cdn_dp_reg_write(dp, HSYNC2VSYNC_POL_CTRL, 0);
> +
> + link_rate = drm_dp_bw_code_to_link_rate(dp->link.rate) / 1000;
> +
> + val = TU_SIZE * mode->clock * bit_per_pix;
> + val /= dp->link.num_lanes * link_rate * 8 * 1000;
> + val += TU_SIZE << 8;
> +
> + cdn_dp_reg_write(dp, DP_FRAMER_TU, val);
> +
> + switch (video->color_depth) {
> + case 6:
> + val = BCS_6;
> + break;
> + case 8:
> + val = BCS_8;
> + break;
> + case 10:
> + val = BCS_10;
> + break;
> + case 12:
> + val = BCS_12;
> + break;
> + case 16:
> + val = BCS_16;
> + break;
> + };
> +
> + val += video->color_fmt << 8;
> + cdn_dp_reg_write(dp, DP_FRAMER_PXL_REPR, val);
> +
> + val = video->h_sync_polarity ? DP_FRAMER_SP_HSP : 0;
> + val |= video->v_sync_polarity ? DP_FRAMER_SP_VSP : 0;
> + cdn_dp_reg_write(dp, DP_FRAMER_SP, val);
> +
> + val = (mode->hsync_start - mode->hdisplay) << 16;
> + val |= mode->htotal - mode->hsync_end;
> + cdn_dp_reg_write(dp, DP_FRONT_BACK_PORCH, val);
> +
> + val = mode->hdisplay * bit_per_pix / 8;
> + cdn_dp_reg_write(dp, DP_BYTE_COUNT, val);
> +
> + val = mode->htotal | ((mode->htotal - mode->hsync_start) << 16);
> + cdn_dp_reg_write(dp, MSA_HORIZONTAL_0, val);
> +
> + val = mode->hsync_end - mode->hsync_start;
> + val |= (mode->hdisplay << 16) | (video->h_sync_polarity << 15);
> + cdn_dp_reg_write(dp, MSA_HORIZONTAL_1, val);
> +
> + val = mode->vtotal;
> + val |= ((mode->vtotal - mode->vsync_start) << 16);
> +
> + cdn_dp_reg_write(dp, MSA_VERTICAL_0, val);
> +
> + val = mode->vsync_end - mode->vsync_start;
> + val |= mode->vdisplay << 16;
> + val |= (video->v_sync_polarity << 15);
> + cdn_dp_reg_write(dp, MSA_VERTICAL_1, val);
> +
> + val = cdn_dp_get_msa_misc(video, mode);
> + cdn_dp_reg_write(dp, MSA_MISC, val);
> +
> + cdn_dp_reg_write(dp, STREAM_CONFIG, 1);
> +
> + val = mode->hsync_end - mode->hsync_start;
> + val |= (mode->hdisplay << 16);
> + cdn_dp_reg_write(dp, DP_HORIZONTAL, val);
> +
> + val = mode->vtotal;
> + val -= (mode->vtotal - mode->vdisplay);
> + val |= (mode->vtotal - mode->vsync_start) << 16;
> +
> + cdn_dp_reg_write(dp, DP_VERTICAL_0, val);
> +
> + val = mode->vtotal;
> + cdn_dp_reg_write(dp, DP_VERTICAL_1, val);
> +
> + val = 0;
> + cdn_dp_reg_write_bit(dp, DP_VB_ID, 2, 1, val);
> +

Error returns from alled functions are quite persistently ignored.
Please either have functions not return errors, or check the returned
error values.

> + return 0;
> +}
> +
> +int cdn_dp_audio_stop(struct cdn_dp_device *dp, struct audio_info *audio)
> +{
> + cdn_dp_reg_write(dp, AUDIO_PACK_CONTROL, AUDIO_PACK_EN(0));
> +
> + if (audio->format == AFMT_SPDIF)
> + clk_disable_unprepare(dp->spdif_clk);
> +
> + return 0;
> +}
> +
> +int cdn_dp_audio_mute(struct cdn_dp_device *dp, bool enable)
> +{
> + cdn_dp_reg_write_bit(dp, DP_VB_ID, 4, 1, enable);
> +
> + return 0;
> +}
> +
> +int cdn_dp_audio_config_set(struct cdn_dp_device *dp, struct audio_info *audio)
> +{
> + int lanes_param, i2s_port_en_val, val, i;
> +
> + if ((audio->channels == 2) && (dp->link.num_lanes == 1))

Unnecessary ( )

> + lanes_param = 1;
> + else if (audio->channels == 2)
> + lanes_param = 3;
> + else
> + lanes_param = 0;
> +
> + if (audio->channels == 2)
> + i2s_port_en_val = 1;
> + else if (audio->channels == 4)
> + i2s_port_en_val = 3;
> + else
> + i2s_port_en_val = 0xf;
> +
> + cdn_dp_reg_write(dp, CM_LANE_CTRL, 0x8000);
> +
> + cdn_dp_reg_write(dp, CM_CTRL, 0);
> +
> + if (audio->format == AFMT_I2S) {
> + writel(0x0, dp->regs + SPDIF_CTRL_ADDR);
> +
> + writel(SYNC_WR_TO_CH_ZERO, dp->regs + FIFO_CNTL);
> +
> + val = audio->channels - 1;
> + val |= (audio->channels / 2 - 1) << 5;
> + val |= BIT(8);
> + val |= lanes_param << 11;
> + writel(val, dp->regs + SMPL2PKT_CNFG);
> +
> + if (audio->sample_width == 16)
> + val = 0;
> + else if (audio->sample_width == 24)
> + val = 1 << 9;
> + else
> + val = 2 << 9;
> +
> + val |= (audio->channels - 1) << 2;
> + val |= i2s_port_en_val << 17;
> + val |= 2 << 11;
> + writel(val, dp->regs + AUDIO_SRC_CNFG);
> +
> + for (i = 0; i < (audio->channels + 1) / 2; i++) {
> + if (audio->sample_width == 16)
> + val = (0x08 << 8) | (0x08 << 20);
> + else if (audio->sample_width == 24)
> + val = (0x0b << 8) | (0x0b << 20);
> +
> + val |= ((2 * i) << 4) | ((2 * i + 1) << 16);
> + writel(val, dp->regs + STTS_BIT_CH(i));
> + }
> +
> + switch (audio->sample_rate) {
> + case 32000:
> + val = SAMPLING_FREQ(3) |
> + ORIGINAL_SAMP_FREQ(0xc);
> + break;
> + case 44100:
> + val = SAMPLING_FREQ(0) |
> + ORIGINAL_SAMP_FREQ(0xf);
> + break;
> + case 48000:
> + val = SAMPLING_FREQ(2) |
> + ORIGINAL_SAMP_FREQ(0xd);
> + break;
> + case 88200:
> + val = SAMPLING_FREQ(8) |
> + ORIGINAL_SAMP_FREQ(0x7);
> + break;
> + case 96000:
> + val = SAMPLING_FREQ(0xa) |
> + ORIGINAL_SAMP_FREQ(5);
> + break;
> + case 176400:
> + val = SAMPLING_FREQ(0xc) |
> + ORIGINAL_SAMP_FREQ(3);
> + break;
> + case 192000:
> + val = SAMPLING_FREQ(0xe) |
> + ORIGINAL_SAMP_FREQ(1);
> + break;
> + }
> + val |= 4;
> + writel(val, dp->regs + COM_CH_STTS_BITS);
> +
> + writel(2, dp->regs + SMPL2PKT_CNTL);
> + writel(2, dp->regs + AUDIO_SRC_CNTL);
> + cdn_dp_reg_write_bit(dp, DP_VB_ID, 4, 1, 0);
> + } else {
> + val = 0x1F0707;
> + writel(val, dp->regs + SPDIF_CTRL_ADDR);
> +
> + writel(SYNC_WR_TO_CH_ZERO, dp->regs + FIFO_CNTL);
> +
> + val = 0x101 | (3 << 11);
> + writel(val, dp->regs + SMPL2PKT_CNFG);
> + writel(2, dp->regs + SMPL2PKT_CNTL);
> +
> + val = 0x3F0707;
> + writel(val, dp->regs + SPDIF_CTRL_ADDR);
> + }
> +
> + if (audio->format == AFMT_SPDIF) {
> + clk_prepare_enable(dp->spdif_clk);
> + clk_set_rate(dp->spdif_clk, 400000000);
> + }
> +
> + return cdn_dp_reg_write(dp, AUDIO_PACK_CONTROL, AUDIO_PACK_EN(1));
> +}
> diff --git a/drivers/gpu/drm/rockchip/cdn-dp-reg.h b/drivers/gpu/drm/rockchip/cdn-dp-reg.h
> new file mode 100644
> index 0000000..da6a1cc
> --- /dev/null
> +++ b/drivers/gpu/drm/rockchip/cdn-dp-reg.h
> @@ -0,0 +1,404 @@
> +/*
> + * Copyright (C) Fuzhou Rockchip Electronics Co.Ltd
> + * Author: Chris Zhong <zyw@xxxxxxxxxxxxxx>
> + *
> + * This software is licensed under the terms of the GNU General Public
> + * License version 2, as published by the Free Software Foundation, and
> + * may be copied, distributed, and modified under those terms.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#ifndef _CDN_DP_REG_H
> +#define _CDN_DP_REG_H
> +
> +#include <linux/bitops.h>
> +
> +#define ADDR_IMEM 0x10000
> +#define ADDR_DMEM 0x20000
> +
> +/* APB CFG addr */
> +#define APB_CTRL 0
> +#define XT_INT_CTRL 0x04
> +#define MAILBOX_FULL_ADDR 0x08
> +#define MAILBOX_EMPTY_ADDR 0x0c
> +#define MAILBOX0_WR_DATA 0x10
> +#define MAILBOX0_RD_DATA 0x14
> +#define KEEP_ALIVE 0x18
> +#define VER_L 0x1c
> +#define VER_H 0x20
> +#define VER_LIB_L_ADDR 0x24
> +#define VER_LIB_H_ADDR 0x28
> +#define SW_DEBUG_L 0x2c
> +#define SW_DEBUG_H 0x30
> +#define MAILBOX_INT_MASK 0x34
> +#define MAILBOX_INT_STATUS 0x38
> +#define SW_CLK_L 0x3c
> +#define SW_CLK_H 0x40
> +#define SW_EVENTS0 0x44
> +#define SW_EVENTS1 0x48
> +#define SW_EVENTS2 0x4c
> +#define SW_EVENTS3 0x50
> +#define XT_OCD_CTRL 0x60
> +#define APB_INT_MASK 0x6c
> +#define APB_STATUS_MASK 0x70
> +
> +/* audio decoder addr */
> +#define AUDIO_SRC_CNTL 0x30000
> +#define AUDIO_SRC_CNFG 0x30004
> +#define COM_CH_STTS_BITS 0x30008
> +#define STTS_BIT_CH(x) (0x3000c + (x << 2))

(x)

> +#define SPDIF_CTRL_ADDR 0x3004c
> +#define SPDIF_CH1_CS_3100_ADDR 0x30050
> +#define SPDIF_CH1_CS_6332_ADDR 0x30054
> +#define SPDIF_CH1_CS_9564_ADDR 0x30058
> +#define SPDIF_CH1_CS_12796_ADDR 0x3005c
> +#define SPDIF_CH1_CS_159128_ADDR 0x30060
> +#define SPDIF_CH1_CS_191160_ADDR 0x30064
> +#define SPDIF_CH2_CS_3100_ADDR 0x30068
> +#define SPDIF_CH2_CS_6332_ADDR 0x3006c
> +#define SPDIF_CH2_CS_9564_ADDR 0x30070
> +#define SPDIF_CH2_CS_12796_ADDR 0x30074
> +#define SPDIF_CH2_CS_159128_ADDR 0x30078
> +#define SPDIF_CH2_CS_191160_ADDR 0x3007c
> +#define SMPL2PKT_CNTL 0x30080
> +#define SMPL2PKT_CNFG 0x30084
> +#define FIFO_CNTL 0x30088
> +#define FIFO_STTS 0x3008c
> +
> +/* source pif addr */
> +#define SOURCE_PIF_WR_ADDR 0x30800
> +#define SOURCE_PIF_WR_REQ 0x30804
> +#define SOURCE_PIF_RD_ADDR 0x30808
> +#define SOURCE_PIF_RD_REQ 0x3080c
> +#define SOURCE_PIF_DATA_WR 0x30810
> +#define SOURCE_PIF_DATA_RD 0x30814
> +#define SOURCE_PIF_FIFO1_FLUSH 0x30818
> +#define SOURCE_PIF_FIFO2_FLUSH 0x3081c
> +#define SOURCE_PIF_STATUS 0x30820
> +#define SOURCE_PIF_INTERRUPT_SOURCE 0x30824
> +#define SOURCE_PIF_INTERRUPT_MASK 0x30828
> +#define SOURCE_PIF_PKT_ALLOC_REG 0x3082c
> +#define SOURCE_PIF_PKT_ALLOC_WR_EN 0x30830
> +#define SOURCE_PIF_SW_RESET 0x30834
> +
> +/* bellow registers need access by mailbox */
> +/* source car addr */
> +#define SOURCE_HDTX_CAR 0x0900
> +#define SOURCE_DPTX_CAR 0x0904
> +#define SOURCE_PHY_CAR 0x0908
> +#define SOURCE_CEC_CAR 0x090c
> +#define SOURCE_CBUS_CAR 0x0910
> +#define SOURCE_PKT_CAR 0x0918
> +#define SOURCE_AIF_CAR 0x091c
> +#define SOURCE_CIPHER_CAR 0x0920
> +#define SOURCE_CRYPTO_CAR 0x0924
> +
> +/* clock meters addr */
> +#define CM_CTRL 0x0a00
> +#define CM_I2S_CTRL 0x0a04
> +#define CM_SPDIF_CTRL 0x0a08
> +#define CM_VID_CTRL 0x0a0c
> +#define CM_LANE_CTRL 0x0a10
> +#define I2S_NM_STABLE 0x0a14
> +#define I2S_NCTS_STABLE 0x0a18
> +#define SPDIF_NM_STABLE 0x0a1c
> +#define SPDIF_NCTS_STABLE 0x0a20
> +#define NMVID_MEAS_STABLE 0x0a24
> +#define I2S_MEAS 0x0a40
> +#define SPDIF_MEAS 0x0a80
> +#define NMVID_MEAS 0x0ac0
> +
> +/* source vif addr */
> +#define BND_HSYNC2VSYNC 0x0b00
> +#define HSYNC2VSYNC_F1_L1 0x0b04
> +#define HSYNC2VSYNC_F2_L1 0x0b08
> +#define HSYNC2VSYNC_STATUS 0x0b0c
> +#define HSYNC2VSYNC_POL_CTRL 0x0b10
> +
> +/* dptx phy addr */
> +#define DP_TX_PHY_CONFIG_REG 0x2000
> +#define DP_TX_PHY_STATUS_REG 0x2004
> +#define DP_TX_PHY_SW_RESET 0x2008
> +#define DP_TX_PHY_SCRAMBLER_SEED 0x200c
> +#define DP_TX_PHY_TRAINING_01_04 0x2010
> +#define DP_TX_PHY_TRAINING_05_08 0x2014
> +#define DP_TX_PHY_TRAINING_09_10 0x2018
> +#define TEST_COR 0x23fc
> +
> +/* dptx hpd addr */
> +#define HPD_IRQ_DET_MIN_TIMER 0x2100
> +#define HPD_IRQ_DET_MAX_TIMER 0x2104
> +#define HPD_UNPLGED_DET_MIN_TIMER 0x2108
> +#define HPD_STABLE_TIMER 0x210c
> +#define HPD_FILTER_TIMER 0x2110
> +#define HPD_EVENT_MASK 0x211c
> +#define HPD_EVENT_DET 0x2120
> +
> +/* dpyx framer addr */
> +#define DP_FRAMER_GLOBAL_CONFIG 0x2200
> +#define DP_SW_RESET 0x2204
> +#define DP_FRAMER_TU 0x2208
> +#define DP_FRAMER_PXL_REPR 0x220c
> +#define DP_FRAMER_SP 0x2210
> +#define AUDIO_PACK_CONTROL 0x2214
> +#define DP_VC_TABLE(x) (0x2218 + (x << 2))

(x)

> +#define DP_VB_ID 0x2258
> +#define DP_MTPH_LVP_CONTROL 0x225c
> +#define DP_MTPH_SYMBOL_VALUES 0x2260
> +#define DP_MTPH_ECF_CONTROL 0x2264
> +#define DP_MTPH_ACT_CONTROL 0x2268
> +#define DP_MTPH_STATUS 0x226c
> +#define DP_INTERRUPT_SOURCE 0x2270
> +#define DP_INTERRUPT_MASK 0x2274
> +#define DP_FRONT_BACK_PORCH 0x2278
> +#define DP_BYTE_COUNT 0x227c
> +
> +/* dptx stream addr */
> +#define MSA_HORIZONTAL_0 0x2280
> +#define MSA_HORIZONTAL_1 0x2284
> +#define MSA_VERTICAL_0 0x2288
> +#define MSA_VERTICAL_1 0x228c
> +#define MSA_MISC 0x2290
> +#define STREAM_CONFIG 0x2294
> +#define AUDIO_PACK_STATUS 0x2298
> +#define VIF_STATUS 0x229c
> +#define PCK_STUFF_STATUS_0 0x22a0
> +#define PCK_STUFF_STATUS_1 0x22a4
> +#define INFO_PACK_STATUS 0x22a8
> +#define RATE_GOVERNOR_STATUS 0x22ac
> +#define DP_HORIZONTAL 0x22b0
> +#define DP_VERTICAL_0 0x22b4
> +#define DP_VERTICAL_1 0x22b8
> +#define DP_BLOCK_SDP 0x22bc
> +
> +/* dptx glbl addr */
> +#define DPTX_LANE_EN 0x2300
> +#define DPTX_ENHNCD 0x2304
> +#define DPTX_INT_MASK 0x2308
> +#define DPTX_INT_STATUS 0x230c
> +
> +/* dp aux addr */
> +#define DP_AUX_HOST_CONTROL 0x2800
> +#define DP_AUX_INTERRUPT_SOURCE 0x2804
> +#define DP_AUX_INTERRUPT_MASK 0x2808
> +#define DP_AUX_SWAP_INVERSION_CONTROL 0x280c
> +#define DP_AUX_SEND_NACK_TRANSACTION 0x2810
> +#define DP_AUX_CLEAR_RX 0x2814
> +#define DP_AUX_CLEAR_TX 0x2818
> +#define DP_AUX_TIMER_STOP 0x281c
> +#define DP_AUX_TIMER_CLEAR 0x2820
> +#define DP_AUX_RESET_SW 0x2824
> +#define DP_AUX_DIVIDE_2M 0x2828
> +#define DP_AUX_TX_PREACHARGE_LENGTH 0x282c
> +#define DP_AUX_FREQUENCY_1M_MAX 0x2830
> +#define DP_AUX_FREQUENCY_1M_MIN 0x2834
> +#define DP_AUX_RX_PRE_MIN 0x2838
> +#define DP_AUX_RX_PRE_MAX 0x283c
> +#define DP_AUX_TIMER_PRESET 0x2840
> +#define DP_AUX_NACK_FORMAT 0x2844
> +#define DP_AUX_TX_DATA 0x2848
> +#define DP_AUX_RX_DATA 0x284c
> +#define DP_AUX_TX_STATUS 0x2850
> +#define DP_AUX_RX_STATUS 0x2854
> +#define DP_AUX_RX_CYCLE_COUNTER 0x2858
> +#define DP_AUX_MAIN_STATES 0x285c
> +#define DP_AUX_MAIN_TIMER 0x2860
> +#define DP_AUX_AFE_OUT 0x2864
> +
> +/* crypto addr */
> +#define CRYPTO_HDCP_REVISION 0x5800
> +#define HDCP_CRYPTO_CONFIG 0x5804
> +#define CRYPTO_INTERRUPT_SOURCE 0x5808
> +#define CRYPTO_INTERRUPT_MASK 0x580c
> +#define CRYPTO22_CONFIG 0x5818
> +#define CRYPTO22_STATUS 0x581c
> +#define SHA_256_DATA_IN 0x583c
> +#define SHA_256_DATA_OUT_(x) (0x5850 + (x << 2))
> +#define AES_32_KEY_(x) (0x5870 + (x << 2))
> +#define AES_32_DATA_IN 0x5880
> +#define AES_32_DATA_OUT_(x) (0x5884 + (x << 2))

(x)

> +#define CRYPTO14_CONFIG 0x58a0
> +#define CRYPTO14_STATUS 0x58a4
> +#define CRYPTO14_PRNM_OUT 0x58a8
> +#define CRYPTO14_KM_0 0x58ac
> +#define CRYPTO14_KM_1 0x58b0
> +#define CRYPTO14_AN_0 0x58b4
> +#define CRYPTO14_AN_1 0x58b8
> +#define CRYPTO14_YOUR_KSV_0 0x58bc
> +#define CRYPTO14_YOUR_KSV_1 0x58c0
> +#define CRYPTO14_MI_0 0x58c4
> +#define CRYPTO14_MI_1 0x58c8
> +#define CRYPTO14_TI_0 0x58cc
> +#define CRYPTO14_KI_0 0x58d0
> +#define CRYPTO14_KI_1 0x58d4
> +#define CRYPTO14_BLOCKS_NUM 0x58d8
> +#define CRYPTO14_KEY_MEM_DATA_0 0x58dc
> +#define CRYPTO14_KEY_MEM_DATA_1 0x58e0
> +#define CRYPTO14_SHA1_MSG_DATA 0x58e4
> +#define CRYPTO14_SHA1_V_VALUE_(x) (0x58e8 + (x << 2))

(x)

> +#define TRNG_CTRL 0x58fc
> +#define TRNG_DATA_RDY 0x5900
> +#define TRNG_DATA 0x5904
> +
> +/* cipher addr */
> +#define HDCP_REVISION 0x60000
> +#define INTERRUPT_SOURCE 0x60004
> +#define INTERRUPT_MASK 0x60008
> +#define HDCP_CIPHER_CONFIG 0x6000c
> +#define AES_128_KEY_0 0x60010
> +#define AES_128_KEY_1 0x60014
> +#define AES_128_KEY_2 0x60018
> +#define AES_128_KEY_3 0x6001c
> +#define AES_128_RANDOM_0 0x60020
> +#define AES_128_RANDOM_1 0x60024
> +#define CIPHER14_KM_0 0x60028
> +#define CIPHER14_KM_1 0x6002c
> +#define CIPHER14_STATUS 0x60030
> +#define CIPHER14_RI_PJ_STATUS 0x60034
> +#define CIPHER_MODE 0x60038
> +#define CIPHER14_AN_0 0x6003c
> +#define CIPHER14_AN_1 0x60040
> +#define CIPHER22_AUTH 0x60044
> +#define CIPHER14_R0_DP_STATUS 0x60048
> +#define CIPHER14_BOOTSTRAP 0x6004c
> +
> +#define APB_IRAM_PATH BIT(2)
> +#define APB_DRAM_PATH BIT(1)
> +#define APB_XT_RESET BIT(0)
> +
> +/* mailbox */
> +#define MB_OPCODE_ID 0
> +#define MB_MODULE_ID 1
> +#define MB_SIZE_MSB_ID 2
> +#define MB_SIZE_LSB_ID 3
> +#define MB_DATA_ID 4
> +
> +#define MB_MODULE_ID_DP_TX 0x01
> +#define MB_MODULE_ID_HDCP_TX 0x07
> +#define MB_MODULE_ID_HDCP_RX 0x08
> +#define MB_MODULE_ID_HDCP_GENERAL 0x09
> +#define MB_MODULE_ID_GENERAL 0x0a
> +
> +/* general opcode */
> +#define GENERAL_MAIN_CONTROL 0x01
> +#define GENERAL_TEST_ECHO 0x02
> +#define GENERAL_BUS_SETTINGS 0x03
> +#define GENERAL_TEST_ACCESS 0x04
> +
> +#define DPTX_SET_POWER_MNG 0x00
> +#define DPTX_SET_HOST_CAPABILITIES 0x01
> +#define DPTX_GET_EDID 0x02
> +#define DPTX_READ_DPCD 0x03
> +#define DPTX_WRITE_DPCD 0x04
> +#define DPTX_ENABLE_EVENT 0x05
> +#define DPTX_WRITE_REGISTER 0x06
> +#define DPTX_READ_REGISTER 0x07
> +#define DPTX_WRITE_FIELD 0x08
> +#define DPTX_TRAINING_CONTROL 0x09
> +#define DPTX_READ_EVENT 0x0a
> +#define DPTX_READ_LINK_STAT 0x0b
> +#define DPTX_SET_VIDEO 0x0c
> +#define DPTX_SET_AUDIO 0x0d
> +#define DPTX_GET_LAST_AUX_STAUS 0x0e
> +#define DPTX_SET_LINK_BREAK_POINT 0x0f
> +#define DPTX_FORCE_LANES 0x10
> +#define DPTX_HPD_STATE 0x11
> +
> +#define DPTX_EVENT_ENABLE_HPD BIT(0)
> +#define DPTX_EVENT_ENABLE_TRAINING BIT(1)
> +
> +#define LINK_TRAINING_NOT_ACTIVE 0
> +#define LINK_TRAINING_RUN 1
> +#define LINK_TRAINING_RESTART 2
> +
> +#define CONTROL_VIDEO_IDLE 0
> +#define CONTROL_VIDEO_VALID 1
> +
> +#define VIF_BYPASS_INTERLACE BIT(13)
> +#define INTERLACE_FMT_DET BIT(12)
> +#define INTERLACE_DTCT_WIN 0x20
> +
> +#define DP_FRAMER_SP_INTERLACE_EN BIT(2)
> +#define DP_FRAMER_SP_HSP BIT(1)
> +#define DP_FRAMER_SP_VSP BIT(0)
> +
> +/* capability */
> +#define AUX_HOST_INVERT 3
> +#define FAST_LT_SUPPORT 1
> +#define FAST_LT_NOT_SUPPORT 0
> +#define LANE_MAPPING_NORMAL 0xe4
> +#define LANE_MAPPING_FLIPPED 0x1b
> +#define ENHANCED 1
> +
> +#define FULL_LT_STARTED BIT(0)
> +#define FASE_LT_STARTED BIT(1)
> +#define CLK_RECOVERY_FINISHED BIT(2)
> +#define EQ_PHASE_FINISHED BIT(3)
> +#define FASE_LT_START_FINISHED BIT(4)
> +#define CLK_RECOVERY_FAILED BIT(5)
> +#define EQ_PHASE_FAILED BIT(6)
> +#define FASE_LT_FAILED BIT(7)
> +
> +#define DPTX_HPD_EVENT BIT(0)
> +#define DPTX_TRAINING_EVENT BIT(1)
> +#define HDCP_TX_STATUS_EVENT BIT(4)
> +#define HDCP2_TX_IS_KM_STORED_EVENT BIT(5)
> +#define HDCP2_TX_STORE_KM_EVENT BIT(6)
> +#define HDCP_TX_IS_RECEIVER_ID_VALID_EVENT BIT(7)
> +
> +#define EDID_LENGTH_BYTE 0
> +#define EDID_SEGMENT_BUMBER 1
> +#define EDID_DATA 2
> +#define EDID_BLOCK_SIZE 128
> +
> +#define TU_SIZE 64
> +
> +/* audio */
> +#define AUDIO_PACK_EN(x) (x << 8)
> +#define SAMPLING_FREQ(x) (x << 16)
> +#define ORIGINAL_SAMP_FREQ(x) (x << 24)

(x)

> +#define SYNC_WR_TO_CH_ZERO BIT(1)
> +
> +enum voltage_swing_level {
> + VOLTAGE_LEVEL_0,
> + VOLTAGE_LEVEL_1,
> + VOLTAGE_LEVEL_2,
> + VOLTAGE_LEVEL_3,
> +};
> +
> +enum pre_emphasis_level {
> + PRE_EMPHASIS_LEVEL_0,
> + PRE_EMPHASIS_LEVEL_1,
> + PRE_EMPHASIS_LEVEL_2,
> + PRE_EMPHASIS_LEVEL_3,
> +};
> +
> +enum pattern_set {
> + PRBS7 = BIT(0),
> + D10_2 = BIT(1),
> + TRAINING_PTN1 = BIT(2),
> + TRAINING_PTN2 = BIT(3),
> + DP_NONE = BIT(4)
> +};
> +
> +enum VIC_PXL_ENCODING_FORMAT {
> + PXL_RGB = 0x1,
> + YCBCR_4_4_4 = 0x2,
> + YCBCR_4_2_2 = 0x4,
> + YCBCR_4_2_0 = 0x8,
> + Y_ONLY = 0x10,
> +};
> +
> +enum VIC_COLOR_DEPTH {
> + BCS_6 = 0x1,
> + BCS_8 = 0x2,
> + BCS_10 = 0x4,
> + BCS_12 = 0x8,
> + BCS_16 = 0x10,
> +};
> +
> +#endif /* _CDN_DP_REG_H */
> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
> index edd7ec2..98302b3 100644
> --- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
> @@ -969,7 +969,7 @@ static void vop_crtc_enable(struct drm_crtc *crtc)
> vop_dsp_hold_valid_irq_disable(vop);
> }
>
> - pin_pol = 0x8;
> + pin_pol = (s->output_type == DRM_MODE_CONNECTOR_DisplayPort) ? 0 : 0x8;
> pin_pol |= (adjusted_mode->flags & DRM_MODE_FLAG_NHSYNC) ? 0 : 1;
> pin_pol |= (adjusted_mode->flags & DRM_MODE_FLAG_NVSYNC) ? 0 : (1 << 1);
> VOP_CTRL_SET(vop, pin_pol, pin_pol);
> @@ -991,6 +991,10 @@ static void vop_crtc_enable(struct drm_crtc *crtc)
> VOP_CTRL_SET(vop, mipi_pin_pol, pin_pol);
> VOP_CTRL_SET(vop, mipi_en, 1);
> break;
> + case DRM_MODE_CONNECTOR_DisplayPort:
> + VOP_CTRL_SET(vop, dp_pin_pol, pin_pol);
> + VOP_CTRL_SET(vop, dp_en, 1);
> + break;
> default:
> DRM_ERROR("unsupport connector_type[%d]\n", s->output_type);
> }
> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop.h b/drivers/gpu/drm/rockchip/rockchip_drm_vop.h
> index ff4f52e..50a045c 100644
> --- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.h
> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.h
> @@ -45,6 +45,7 @@ struct vop_ctrl {
> struct vop_reg edp_en;
> struct vop_reg hdmi_en;
> struct vop_reg mipi_en;
> + struct vop_reg dp_en;
> struct vop_reg out_mode;
> struct vop_reg dither_down;
> struct vop_reg dither_up;
> @@ -53,6 +54,7 @@ struct vop_ctrl {
> struct vop_reg hdmi_pin_pol;
> struct vop_reg edp_pin_pol;
> struct vop_reg mipi_pin_pol;
> + struct vop_reg dp_pin_pol;
>
> struct vop_reg htotal_pw;
> struct vop_reg hact_st_end;
> diff --git a/drivers/gpu/drm/rockchip/rockchip_vop_reg.c b/drivers/gpu/drm/rockchip/rockchip_vop_reg.c
> index 5b1ae1f..dcf172e 100644
> --- a/drivers/gpu/drm/rockchip/rockchip_vop_reg.c
> +++ b/drivers/gpu/drm/rockchip/rockchip_vop_reg.c
> @@ -281,6 +281,7 @@ static const struct vop_data rk3288_vop = {
> static const struct vop_ctrl rk3399_ctrl_data = {
> .standby = VOP_REG(RK3399_SYS_CTRL, 0x1, 22),
> .gate_en = VOP_REG(RK3399_SYS_CTRL, 0x1, 23),
> + .dp_en = VOP_REG(RK3399_SYS_CTRL, 0x1, 11),
> .rgb_en = VOP_REG(RK3399_SYS_CTRL, 0x1, 12),
> .hdmi_en = VOP_REG(RK3399_SYS_CTRL, 0x1, 13),
> .edp_en = VOP_REG(RK3399_SYS_CTRL, 0x1, 14),
> @@ -290,6 +291,7 @@ static const struct vop_ctrl rk3399_ctrl_data = {
> .data_blank = VOP_REG(RK3399_DSP_CTRL0, 0x1, 19),
> .out_mode = VOP_REG(RK3399_DSP_CTRL0, 0xf, 0),
> .rgb_pin_pol = VOP_REG(RK3399_DSP_CTRL1, 0xf, 16),
> + .dp_pin_pol = VOP_REG(RK3399_DSP_CTRL1, 0xf, 16),
> .hdmi_pin_pol = VOP_REG(RK3399_DSP_CTRL1, 0xf, 20),
> .edp_pin_pol = VOP_REG(RK3399_DSP_CTRL1, 0xf, 24),
> .mipi_pin_pol = VOP_REG(RK3399_DSP_CTRL1, 0xf, 28),