Re: [PATCH 3/3] drm/rockchip: Add support for Rockchip Soc LVDS
From: Sean Paul
Date: Wed Aug 09 2017 - 15:58:22 EST
On Wed, Aug 09, 2017 at 06:00:59PM +0800, Sandy Huang wrote:
> This adds support for Rockchip soc lvds found on rk3288
> Based on the patches from Mark yao and Heiko Stuebner
>
> Signed-off-by: Sandy Huang <hjc@xxxxxxxxxxxxxx>
> Signed-off-by: Mark yao <mark.yao@xxxxxxxxxxxxxx>
> Signed-off-by: Heiko Stuebner <heiko@xxxxxxxxx>
> ---
> drivers/gpu/drm/rockchip/Kconfig | 9 +
> drivers/gpu/drm/rockchip/Makefile | 1 +
> drivers/gpu/drm/rockchip/rockchip_lvds.c | 734 +++++++++++++++++++++++++++++++
> drivers/gpu/drm/rockchip/rockchip_lvds.h | 112 +++++
> 4 files changed, 856 insertions(+)
> create mode 100644 drivers/gpu/drm/rockchip/rockchip_lvds.c
> create mode 100644 drivers/gpu/drm/rockchip/rockchip_lvds.h
>
> diff --git a/drivers/gpu/drm/rockchip/Kconfig b/drivers/gpu/drm/rockchip/Kconfig
> index 50c41c0..80672f4 100644
> --- a/drivers/gpu/drm/rockchip/Kconfig
> +++ b/drivers/gpu/drm/rockchip/Kconfig
> @@ -59,3 +59,12 @@ config ROCKCHIP_INNO_HDMI
> This selects support for Rockchip SoC specific extensions
> for the Innosilicon HDMI driver. If you want to enable
> HDMI on RK3036 based SoC, you should select this option.
> +
> +config ROCKCHIP_LVDS
> + bool "Rockchip LVDS support"
> + depends on DRM_ROCKCHIP
> + help
> + Choose this option to enable support for Rockchip LVDS controllers.
> + Rockchip rk3288 SoC has LVDS TX Controller can be used, and it
> + support LVDS, rgb, dual LVDS output mode. say Y to enable its
> + driver.
> diff --git a/drivers/gpu/drm/rockchip/Makefile b/drivers/gpu/drm/rockchip/Makefile
> index fa8dc9d..a881d2c 100644
> --- a/drivers/gpu/drm/rockchip/Makefile
> +++ b/drivers/gpu/drm/rockchip/Makefile
> @@ -12,5 +12,6 @@ rockchipdrm-$(CONFIG_ROCKCHIP_CDN_DP) += cdn-dp-core.o cdn-dp-reg.o
> rockchipdrm-$(CONFIG_ROCKCHIP_DW_HDMI) += dw_hdmi-rockchip.o
> rockchipdrm-$(CONFIG_ROCKCHIP_DW_MIPI_DSI) += dw-mipi-dsi.o
> rockchipdrm-$(CONFIG_ROCKCHIP_INNO_HDMI) += inno_hdmi.o
> +rockchipdrm-$(CONFIG_ROCKCHIP_LVDS) += rockchip_lvds.o
>
> obj-$(CONFIG_DRM_ROCKCHIP) += rockchipdrm.o
> diff --git a/drivers/gpu/drm/rockchip/rockchip_lvds.c b/drivers/gpu/drm/rockchip/rockchip_lvds.c
> new file mode 100644
> index 0000000..a4ad3f0
> --- /dev/null
> +++ b/drivers/gpu/drm/rockchip/rockchip_lvds.c
> @@ -0,0 +1,734 @@
> +/*
> + * Copyright (C) Fuzhou Rockchip Electronics Co.Ltd
> + * Author:
> + * Mark Yao <mark.yao@xxxxxxxxxxxxxx>
> + * Sandy huang <hjc@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_panel.h>
> +#include <drm/drm_of.h>
> +
> +#include <linux/component.h>
> +#include <linux/clk.h>
> +#include <linux/mfd/syscon.h>
> +#include <linux/of_graph.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/regmap.h>
> +#include <linux/reset.h>
> +
> +#include <video/display_timing.h>
> +
> +#include "rockchip_drm_drv.h"
> +#include "rockchip_drm_vop.h"
> +#include "rockchip_lvds.h"
> +
> +#define DISPLAY_OUTPUT_RGB 0
> +#define DISPLAY_OUTPUT_LVDS 1
> +#define DISPLAY_OUTPUT_DUAL_LVDS 2
> +
> +#define connector_to_lvds(c) \
> + container_of(c, struct rockchip_lvds, connector)
> +
> +#define encoder_to_lvds(c) \
> + container_of(c, struct rockchip_lvds, encoder)
> +#define LVDS_CHIP(lvds) ((lvds)->soc_data->chip_type)
> +
> +/*
> + * @grf_offset: offset inside the grf regmap for setting the rockchip lvds
You only document one member and it doesn't exist :(
> + */
> +struct rockchip_lvds_soc_data {
> + int chip_type;
> + int grf_soc_con6;
> + int grf_soc_con7;
> +
> + bool has_vop_sel;
> +};
> +
> +struct rockchip_lvds {
> + void *base;
> + struct device *dev;
> + void __iomem *regs;
> + struct regmap *grf;
> + struct clk *pclk;
> + const struct rockchip_lvds_soc_data *soc_data;
> +
> + int output;
> + int format;
> +
> + struct drm_device *drm_dev;
> + struct drm_panel *panel;
> + struct drm_bridge *bridge;
> + struct drm_connector connector;
> + struct drm_encoder encoder;
> +
> + struct mutex suspend_lock;
> + int suspend;
> + struct dev_pin_info *pins;
> + struct drm_display_mode mode;
> +};
> +
> +static inline void lvds_writel(struct rockchip_lvds *lvds, u32 offset, u32 val)
> +{
> + writel_relaxed(val, lvds->regs + offset);
> + if ((lvds->output != DISPLAY_OUTPUT_LVDS) &&
> + (LVDS_CHIP(lvds) == RK3288_LVDS))
Given that you only support one chip right now, it seems premature to worry
about chip version. At any rate, it seems like it'd be more useful to store
RK3288_LVDS_CHI_OFFSET in soc_data and do:
if (lvds->output == DISPLAY_OUTPUT_LVDS)
return;
writel_relaxed(val, lvds->regs + lvds->soc_data->ch1_offset + offset);
Then get rid of LVDS_CHIP and chip_type.
> + writel_relaxed(val,
> + lvds->regs + offset + RK3288_LVDS_CH1_OFFSET);
> +}
> +
> +static inline int lvds_name_to_format(const char *s)
> +{
> + if (!s)
I don't think this can ever happen (and if it can, you should be initializing
name to NULL each time before you call of_property_read_string) since
of_property_read_string returns an error if prop->value == NULL.
Same comment for lvds_name_to_output.
> + return -EINVAL;
> +
> + if (strncmp(s, "jeida", 6) == 0)
> + return LVDS_FORMAT_JEIDA;
> + else if (strncmp(s, "vesa", 5) == 0)
> + return LVDS_FORMAT_VESA;
> +
> + return -EINVAL;
> +}
> +
> +static inline int lvds_name_to_output(const char *s)
> +{
> + if (!s)
> + return -EINVAL;
> +
> + if (strncmp(s, "rgb", 3) == 0)
> + return DISPLAY_OUTPUT_RGB;
> + else if (strncmp(s, "lvds", 4) == 0)
> + return DISPLAY_OUTPUT_LVDS;
> + else if (strncmp(s, "duallvds", 8) == 0)
> + return DISPLAY_OUTPUT_DUAL_LVDS;
> +
> + return -EINVAL;
> +}
> +
> +static int rockchip_lvds_poweron(struct rockchip_lvds *lvds)
> +{
> + int ret;
> +
> + if (lvds->pclk) {
The clk_* functions check for NULL so you don't have to. Remove all
if (lvds->pclk) checks.
> + ret = clk_enable(lvds->pclk);
> + if (ret < 0) {
> + dev_err(lvds->dev, "failed to enable lvds pclk %d\n", ret);
Please use DRM_DEV_* error message logging.
> + return ret;
> + }
> + }
> + ret = pm_runtime_get_sync(lvds->dev);
> + if (ret < 0) {
> + dev_err(lvds->dev, "failed to get pm runtime: %d\n", ret);
> + return ret;
> + }
> +
> + if (lvds->output == DISPLAY_OUTPUT_RGB) {
> + lvds_writel(lvds, RK3288_LVDS_CH0_REG0,
> + RK3288_LVDS_CH0_REG0_TTL_EN |
> + RK3288_LVDS_CH0_REG0_LANECK_EN |
> + RK3288_LVDS_CH0_REG0_LANE4_EN |
> + RK3288_LVDS_CH0_REG0_LANE3_EN |
> + RK3288_LVDS_CH0_REG0_LANE2_EN |
> + RK3288_LVDS_CH0_REG0_LANE1_EN |
> + RK3288_LVDS_CH0_REG0_LANE0_EN);
> + lvds_writel(lvds, RK3288_LVDS_CH0_REG2,
> + RK3288_LVDS_PLL_FBDIV_REG2(0x46));
> +
> + lvds_writel(lvds, RK3288_LVDS_CH0_REG3,
> + RK3288_LVDS_PLL_FBDIV_REG3(0x46));
> + lvds_writel(lvds, RK3288_LVDS_CH0_REG4,
> + RK3288_LVDS_CH0_REG4_LANECK_TTL_MODE |
> + RK3288_LVDS_CH0_REG4_LANE4_TTL_MODE |
> + RK3288_LVDS_CH0_REG4_LANE3_TTL_MODE |
> + RK3288_LVDS_CH0_REG4_LANE2_TTL_MODE |
> + RK3288_LVDS_CH0_REG4_LANE1_TTL_MODE |
> + RK3288_LVDS_CH0_REG4_LANE0_TTL_MODE);
> + lvds_writel(lvds, RK3288_LVDS_CH0_REG5,
> + RK3288_LVDS_CH0_REG5_LANECK_TTL_DATA |
> + RK3288_LVDS_CH0_REG5_LANE4_TTL_DATA |
> + RK3288_LVDS_CH0_REG5_LANE3_TTL_DATA |
> + RK3288_LVDS_CH0_REG5_LANE2_TTL_DATA |
> + RK3288_LVDS_CH0_REG5_LANE1_TTL_DATA |
> + RK3288_LVDS_CH0_REG5_LANE0_TTL_DATA);
> + lvds_writel(lvds, RK3288_LVDS_CH0_REGD,
> + RK3288_LVDS_PLL_PREDIV_REGD(0x0a));
> + lvds_writel(lvds, RK3288_LVDS_CH0_REG20,
> + RK3288_LVDS_CH0_REG20_LSB);
> + } else {
> + lvds_writel(lvds, RK3288_LVDS_CH0_REG0,
> + RK3288_LVDS_CH0_REG0_LVDS_EN |
> + RK3288_LVDS_CH0_REG0_LANECK_EN |
> + RK3288_LVDS_CH0_REG0_LANE4_EN |
> + RK3288_LVDS_CH0_REG0_LANE3_EN |
> + RK3288_LVDS_CH0_REG0_LANE2_EN |
> + RK3288_LVDS_CH0_REG0_LANE1_EN |
> + RK3288_LVDS_CH0_REG0_LANE0_EN);
> + lvds_writel(lvds, RK3288_LVDS_CH0_REG1,
> + RK3288_LVDS_CH0_REG1_LANECK_BIAS |
> + RK3288_LVDS_CH0_REG1_LANE4_BIAS |
> + RK3288_LVDS_CH0_REG1_LANE3_BIAS |
> + RK3288_LVDS_CH0_REG1_LANE2_BIAS |
> + RK3288_LVDS_CH0_REG1_LANE1_BIAS |
> + RK3288_LVDS_CH0_REG1_LANE0_BIAS);
> + lvds_writel(lvds, RK3288_LVDS_CH0_REG2,
> + RK3288_LVDS_CH0_REG2_RESERVE_ON |
> + RK3288_LVDS_CH0_REG2_LANECK_LVDS_MODE |
> + RK3288_LVDS_CH0_REG2_LANE4_LVDS_MODE |
> + RK3288_LVDS_CH0_REG2_LANE3_LVDS_MODE |
> + RK3288_LVDS_CH0_REG2_LANE2_LVDS_MODE |
> + RK3288_LVDS_CH0_REG2_LANE1_LVDS_MODE |
> + RK3288_LVDS_CH0_REG2_LANE0_LVDS_MODE |
> + RK3288_LVDS_PLL_FBDIV_REG2(0x46));
> + lvds_writel(lvds, RK3288_LVDS_CH0_REG3,
> + RK3288_LVDS_PLL_FBDIV_REG3(0x46));
> + lvds_writel(lvds, RK3288_LVDS_CH0_REG4, 0x00);
> + lvds_writel(lvds, RK3288_LVDS_CH0_REG5, 0x00);
> + lvds_writel(lvds, RK3288_LVDS_CH0_REGD,
> + RK3288_LVDS_PLL_PREDIV_REGD(0x0a));
> + lvds_writel(lvds, RK3288_LVDS_CH0_REG20,
> + RK3288_LVDS_CH0_REG20_LSB);
The following register writes can be shared by both branches:
RK3288_LVDS_CH0_REG0 (aside from the enable bit, but that's easy)
RK3288_LVDS_CH0_REG3
RK3288_LVDS_CH0_REGD
RK3288_LVDS_CH0_REG20
That should hopefully trim this function down.
> + }
> +
> + writel(RK3288_LVDS_CFG_REGC_PLL_ENABLE,
> + lvds->regs + RK3288_LVDS_CFG_REGC);
> + writel(RK3288_LVDS_CFG_REG21_TX_ENABLE,
> + lvds->regs + RK3288_LVDS_CFG_REG21);
> +
> + return 0;
> +}
> +
> +static void rockchip_lvds_poweroff(struct rockchip_lvds *lvds)
> +{
> + int ret;
> +
> + writel(RK3288_LVDS_CFG_REG21_TX_DISABLE,
> + lvds->regs + RK3288_LVDS_CFG_REG21);
> + writel(RK3288_LVDS_CFG_REGC_PLL_DISABLE,
> + lvds->regs + RK3288_LVDS_CFG_REGC);
> + ret = regmap_write(lvds->grf,
> + lvds->soc_data->grf_soc_con7, 0xffff8000);
Can you expand on this value? It's quite magical right now.
> + if (ret != 0)
> + dev_err(lvds->dev, "Could not write to GRF: %d\n", ret);
> +
> + pm_runtime_put(lvds->dev);
> + if (lvds->pclk)
> + clk_disable(lvds->pclk);
> +}
> +
> +static enum drm_connector_status
> +rockchip_lvds_connector_detect(struct drm_connector *connector, bool force)
> +{
> + return connector_status_connected;
> +}
> +
> +static void rockchip_lvds_connector_destroy(struct drm_connector *connector)
> +{
> + drm_connector_cleanup(connector);
> +}
> +
> +static const struct drm_connector_funcs rockchip_lvds_connector_funcs = {
> + .dpms = drm_atomic_helper_connector_dpms,
> + .detect = rockchip_lvds_connector_detect,
> + .fill_modes = drm_helper_probe_single_connector_modes,
> + .destroy = rockchip_lvds_connector_destroy,
> + .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 rockchip_lvds_connector_get_modes(struct drm_connector *connector)
> +{
> + struct rockchip_lvds *lvds = connector_to_lvds(connector);
> + struct drm_panel *panel = lvds->panel;
> +
> + return panel->funcs->get_modes(panel);
> +}
> +
> +static struct drm_encoder *
> +rockchip_lvds_connector_best_encoder(struct drm_connector *connector)
> +{
> + struct rockchip_lvds *lvds = connector_to_lvds(connector);
> +
> + return &lvds->encoder;
> +}
> +
> +static enum drm_mode_status rockchip_lvds_connector_mode_valid(
> + struct drm_connector *connector,
> + struct drm_display_mode *mode)
> +{
> + return MODE_OK;
> +}
> +
> +static const
> +struct drm_connector_helper_funcs rockchip_lvds_connector_helper_funcs = {
> + .get_modes = rockchip_lvds_connector_get_modes,
> + .mode_valid = rockchip_lvds_connector_mode_valid,
> + .best_encoder = rockchip_lvds_connector_best_encoder,
> +};
> +
> +static void rockchip_lvds_encoder_dpms(struct drm_encoder *encoder, int mode)
Why are you using dpms mode here? Just implement the functionality directly in
enable() & disable()
> +{
> + struct rockchip_lvds *lvds = encoder_to_lvds(encoder);
> + int ret;
> +
> + mutex_lock(&lvds->suspend_lock);
What is this lock protecting against? rockchip is using the atomic helper for
suspend/resume, so locking should be handled in core.
> +
> + switch (mode) {
> + case DRM_MODE_DPMS_ON:
> + if (!lvds->suspend)
Can we rename this to enabled instead? I assume this is protecting the
pm_runtime reference?
> + goto out;
> +
> + drm_panel_prepare(lvds->panel);
> + ret = rockchip_lvds_poweron(lvds);
> + if (ret < 0) {
> + drm_panel_unprepare(lvds->panel);
> + goto out;
> + }
> + drm_panel_enable(lvds->panel);
> +
> + lvds->suspend = false;
> + break;
> + case DRM_MODE_DPMS_STANDBY:
> + case DRM_MODE_DPMS_SUSPEND:
> + case DRM_MODE_DPMS_OFF:
> + if (lvds->suspend)
> + goto out;
> +
> + drm_panel_disable(lvds->panel);
> + rockchip_lvds_poweroff(lvds);
> + drm_panel_unprepare(lvds->panel);
> +
> + lvds->suspend = true;
> + break;
> + default:
> + break;
> + }
> +
> +out:
> + mutex_unlock(&lvds->suspend_lock);
> +}
> +
> +static bool
> +rockchip_lvds_encoder_mode_fixup(struct drm_encoder *encoder,
> + const struct drm_display_mode *mode,
> + struct drm_display_mode *adjusted_mode)
> +{
> + return true;
> +}
> +
> +static void rockchip_lvds_encoder_mode_set(struct drm_encoder *encoder,
> + struct drm_display_mode *mode,
> + struct drm_display_mode *adjusted)
> +{
> + struct rockchip_lvds *lvds = encoder_to_lvds(encoder);
> +
> + drm_mode_copy(&lvds->mode, adjusted);
> +}
> +
> +static void rockchip_lvds_grf_config(struct drm_encoder *encoder,
> + struct drm_display_mode *mode)
> +{
> + struct rockchip_lvds *lvds = encoder_to_lvds(encoder);
> + u32 h_bp = mode->htotal - mode->hsync_start;
No need for the local var, just do the subtraction in () below
> + u8 pin_hsync = (mode->flags & DRM_MODE_FLAG_PHSYNC) ? 1 : 0;
> + u8 pin_dclk = (mode->flags & DRM_MODE_FLAG_PCSYNC) ? 1 : 0;
> + u32 val;
> + int ret;
> +
> + /* iomux to LCD data/sync mode */
> + if (lvds->output == DISPLAY_OUTPUT_RGB)
> + if (lvds->pins && !IS_ERR(lvds->pins->default_state))
> + pinctrl_select_state(lvds->pins->p,
> + lvds->pins->default_state);
> + val = lvds->format;
val = lvds->format | LVDS_CH0_EN;
then remove LVDS_CH0_EN from below
> + if (lvds->output == DISPLAY_OUTPUT_DUAL_LVDS)
> + val |= LVDS_DUAL | LVDS_CH0_EN | LVDS_CH1_EN;
> + else if (lvds->output == DISPLAY_OUTPUT_LVDS)
> + val |= LVDS_CH0_EN;
> + else if (lvds->output == DISPLAY_OUTPUT_RGB)
> + val |= LVDS_TTL_EN | LVDS_CH0_EN | LVDS_CH1_EN;
> +
> + if (h_bp & 0x01)
> + val |= LVDS_START_PHASE_RST_1;
> +
> + val |= (pin_dclk << 8) | (pin_hsync << 9);
> + val |= (0xffff << 16);
> + ret = regmap_write(lvds->grf, lvds->soc_data->grf_soc_con7, val);
> + if (ret != 0) {
> + dev_err(lvds->dev, "Could not write to GRF: %d\n", ret);
> + return;
> + }
> +}
> +
> +static int rockchip_lvds_set_vop_source(struct rockchip_lvds *lvds,
> + struct drm_encoder *encoder)
> +{
> + u32 val;
> + int ret;
> +
> + if (!lvds->soc_data->has_vop_sel)
> + return 0;
> +
> + ret = drm_of_encoder_active_endpoint_id(lvds->dev->of_node, encoder);
> + if (ret < 0)
> + return ret;
> +
> + if (ret)
> + val = RK3288_LVDS_SOC_CON6_SEL_VOP_LIT |
> + (RK3288_LVDS_SOC_CON6_SEL_VOP_LIT << 16);
> + else
> + val = RK3288_LVDS_SOC_CON6_SEL_VOP_LIT << 16;
val = RK3288_LVDS_SOC_CON6_SEL_VOP_LIT << 16;
if (ret)
val |= RK3288_LVDS_SOC_CON6_SEL_VOP_LIT;
> +
> + ret = regmap_write(lvds->grf, lvds->soc_data->grf_soc_con6, val);
> + if (ret < 0)
> + return ret;
> +
> + return 0;
> +}
> +
> +static int
> +rockchip_lvds_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);
> +
> +
nit: extra line
> + s->output_mode = ROCKCHIP_OUT_MODE_P888;
> + s->output_type = DRM_MODE_CONNECTOR_LVDS;
> +
> +
> + return 0;
> +}
> +
> +static void rockchip_lvds_encoder_enable(struct drm_encoder *encoder)
> +{
> + struct rockchip_lvds *lvds = encoder_to_lvds(encoder);
> +
> + rockchip_lvds_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
> + rockchip_lvds_grf_config(encoder, &lvds->mode);
> + rockchip_lvds_set_vop_source(lvds, encoder);
> +}
> +
> +static void rockchip_lvds_encoder_disable(struct drm_encoder *encoder)
> +{
> + rockchip_lvds_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
> +}
> +
> +static const
> +struct drm_encoder_helper_funcs rockchip_lvds_encoder_helper_funcs = {
> + .mode_fixup = rockchip_lvds_encoder_mode_fixup,
> + .mode_set = rockchip_lvds_encoder_mode_set,
> + .enable = rockchip_lvds_encoder_enable,
> + .disable = rockchip_lvds_encoder_disable,
> + .atomic_check = rockchip_lvds_encoder_atomic_check,
> +};
> +
> +static void rockchip_lvds_encoder_destroy(struct drm_encoder *encoder)
> +{
> + drm_encoder_cleanup(encoder);
> +}
> +
> +static const struct drm_encoder_funcs rockchip_lvds_encoder_funcs = {
> + .destroy = rockchip_lvds_encoder_destroy,
> +};
> +
> +static struct rockchip_lvds_soc_data rk3288_lvds_data = {
> + .chip_type = RK3288_LVDS,
> + .grf_soc_con6 = 0x025c,
> + .grf_soc_con7 = 0x0260,
> + .has_vop_sel = true,
> +};
> +
> +static const struct of_device_id rockchip_lvds_dt_ids[] = {
> + {
> + .compatible = "rockchip,rk3288-lvds",
> + .data = &rk3288_lvds_data
> + },
> + {}
> +};
> +MODULE_DEVICE_TABLE(of, rockchip_lvds_dt_ids);
> +
> +static int rockchip_lvds_bind(struct device *dev, struct device *master,
> + void *data)
> +{
> + struct rockchip_lvds *lvds = dev_get_drvdata(dev);
> + struct drm_device *drm_dev = data;
> + struct drm_encoder *encoder;
> + struct drm_connector *connector;
> + struct device_node *remote = NULL;
> + struct device_node *port, *endpoint;
> + int ret, i;
Looks like i is just used to read data-width from dt, can you please rename to
"width" or similar?
> + const char *name;
> +
> + lvds->drm_dev = drm_dev;
> + port = of_graph_get_port_by_id(dev->of_node, 1);
> + if (!port) {
> + dev_err(dev, "can't found port point, please init lvds panel port!\n");
> + return -EINVAL;
> + }
> +
> + for_each_child_of_node(port, endpoint) {
> + remote = of_graph_get_remote_port_parent(endpoint);
> + if (!remote) {
> + dev_err(dev, "can't found panel node, please init!\n");
> + ret = -EINVAL;
> + goto err_put_port;
> + }
> + if (!of_device_is_available(remote)) {
> + of_node_put(remote);
> + remote = NULL;
> + continue;
> + }
> + break;
> + }
> + if (!remote) {
> + dev_err(dev, "can't found remote node, please init!\n");
> + ret = -EINVAL;
> + goto err_put_port;
> + }
> +
> + lvds->panel = of_drm_find_panel(remote);
> + if (!lvds->panel)
> + lvds->bridge = of_drm_find_bridge(remote);
drm_of_find_panel_or_bridge()
> +
> + if (!lvds->panel && !lvds->bridge) {
> + DRM_ERROR("failed to find panel and bridge node\n");
> + ret = -EPROBE_DEFER;
> + goto err_put_remote;
> + }
> +
> + if (of_property_read_string(remote, "rockchip,output", &name))
> + /* default set it as output rgb */
> + lvds->output = DISPLAY_OUTPUT_RGB;
> + else
> + lvds->output = lvds_name_to_output(name);
> +
> + if (lvds->output < 0) {
> + dev_err(dev, "invalid output type [%s]\n", name);
> + ret = lvds->output;
> + goto err_put_remote;
> + }
> +
> + if (of_property_read_string(remote, "rockchip,data-mapping",
> + &name))
> + /* default set it as format jeida */
> + lvds->format = LVDS_FORMAT_JEIDA;
> + else
> + lvds->format = lvds_name_to_format(name);
> +
> + if (lvds->format < 0) {
> + dev_err(dev, "invalid data-mapping format [%s]\n", name);
> + ret = lvds->format;
> + goto err_put_remote;
> + }
> +
> + if (of_property_read_u32(remote, "rockchip,data-width", &i)) {
> + lvds->format |= LVDS_24BIT;
> + } else {
> + if (i == 24) {
> + lvds->format |= LVDS_24BIT;
> + } else if (i == 18) {
> + lvds->format |= LVDS_18BIT;
> + } else {
> + dev_err(dev,
> + "rockchip-lvds unsupport data-width[%d]\n", i);
> + ret = -EINVAL;
> + goto err_put_remote;
> + }
> + }
> +
> + encoder = &lvds->encoder;
> + encoder->possible_crtcs = drm_of_find_possible_crtcs(drm_dev,
> + dev->of_node);
> +
> + ret = drm_encoder_init(drm_dev, encoder, &rockchip_lvds_encoder_funcs,
> + DRM_MODE_ENCODER_LVDS, NULL);
> + if (ret < 0) {
> + DRM_ERROR("failed to initialize encoder with drm\n");
Here and below you switched to DRM_ERROR (instead of dev_err) and you don't
print the ret values. Can you please change to DRM_DEV_ERROR and print ret when
exiting?
> + goto err_put_remote;
> + }
> +
> + drm_encoder_helper_add(encoder, &rockchip_lvds_encoder_helper_funcs);
> +
> + if (lvds->panel) {
> + connector = &lvds->connector;
> + connector->dpms = DRM_MODE_DPMS_OFF;
> + ret = drm_connector_init(drm_dev, connector,
> + &rockchip_lvds_connector_funcs,
> + DRM_MODE_CONNECTOR_LVDS);
> + if (ret < 0) {
> + DRM_ERROR("failed to initialize connector with drm\n");
> + goto err_free_encoder;
> + }
> +
> + drm_connector_helper_add(connector,
> + &rockchip_lvds_connector_helper_funcs);
> +
> + ret = drm_mode_connector_attach_encoder(connector, encoder);
> + if (ret < 0) {
> + DRM_ERROR("failed to attach connector and encoder\n");
> + goto err_free_connector;
> + }
> +
> + ret = drm_panel_attach(lvds->panel, connector);
> + if (ret < 0) {
> + DRM_ERROR("failed to attach connector and encoder\n");
> + goto err_free_connector;
> + }
> + } else {
> + lvds->bridge->encoder = encoder;
> + ret = drm_bridge_attach(encoder, lvds->bridge, NULL);
> + if (ret) {
> + DRM_ERROR("Failed to attach bridge to drm\n");
> + goto err_free_encoder;
> + }
> + encoder->bridge = lvds->bridge;
> + }
> +
> + pm_runtime_enable(dev);
> + of_node_put(remote);
> + of_node_put(port);
> +
> + return 0;
> +
> +err_free_connector:
> + drm_connector_cleanup(connector);
> +err_free_encoder:
> + drm_encoder_cleanup(encoder);
> +err_put_remote:
> + of_node_put(remote);
> +err_put_port:
> + of_node_put(port);
> +
> + return ret;
> +}
> +
> +static void rockchip_lvds_unbind(struct device *dev, struct device *master,
> + void *data)
> +{
> + struct rockchip_lvds *lvds = dev_get_drvdata(dev);
> +
> + rockchip_lvds_encoder_dpms(&lvds->encoder, DRM_MODE_DPMS_OFF);
> +
> + drm_panel_detach(lvds->panel);
Oops if lvds->panel is NULL, which will happen if you have a bridge. Speaking of
which, you're also not handling bridge detach.
> +
> + drm_connector_cleanup(&lvds->connector);
> + drm_encoder_cleanup(&lvds->encoder);
> +
> + pm_runtime_disable(dev);
This should probably be first if you're rolling back initialization.
> +}
> +
> +static const struct component_ops rockchip_lvds_component_ops = {
> + .bind = rockchip_lvds_bind,
> + .unbind = rockchip_lvds_unbind,
> +};
> +
> +static int rockchip_lvds_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct rockchip_lvds *lvds;
> + const struct of_device_id *match;
> + struct resource *res;
> + int ret;
> +
> + if (!dev->of_node)
> + return -ENODEV;
> +
> + lvds = devm_kzalloc(&pdev->dev, sizeof(*lvds), GFP_KERNEL);
> + if (!lvds)
> + return -ENOMEM;
> +
> + lvds->dev = dev;
> + lvds->suspend = true;
> + match = of_match_node(rockchip_lvds_dt_ids, dev->of_node);
match can be NULL and you dereference it on the next line
> + lvds->soc_data = match->data;
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + lvds->regs = devm_ioremap_resource(&pdev->dev, res);
> + if (IS_ERR(lvds->regs))
> + return PTR_ERR(lvds->regs);
> +
> + lvds->pclk = devm_clk_get(&pdev->dev, "pclk_lvds");
> + if (IS_ERR(lvds->pclk)) {
> + dev_err(dev, "could not get pclk_lvds\n");
> + return PTR_ERR(lvds->pclk);
> + }
> +
> + lvds->pins = devm_kzalloc(lvds->dev, sizeof(*lvds->pins),
> + GFP_KERNEL);
> + if (!lvds->pins)
> + return -ENOMEM;
> +
> + lvds->pins->p = devm_pinctrl_get(lvds->dev);
> + if (IS_ERR(lvds->pins->p)) {
> + dev_info(lvds->dev, "no pinctrl handle\n");
> + devm_kfree(lvds->dev, lvds->pins);
> + lvds->pins = NULL;
> + } else {
> + lvds->pins->default_state =
> + pinctrl_lookup_state(lvds->pins->p, "lcdc");
> + if (IS_ERR(lvds->pins->default_state)) {
> + dev_info(lvds->dev, "no default pinctrl state\n");
> + devm_kfree(lvds->dev, lvds->pins);
> + lvds->pins = NULL;
> + }
> + }
> +
> + lvds->grf = syscon_regmap_lookup_by_phandle(dev->of_node,
> + "rockchip,grf");
> + if (IS_ERR(lvds->grf)) {
> + dev_err(dev, "missing rockchip,grf property\n");
> + return PTR_ERR(lvds->grf);
> + }
> +
> + dev_set_drvdata(dev, lvds);
> + mutex_init(&lvds->suspend_lock);
> +
> + if (lvds->pclk) {
> + ret = clk_prepare(lvds->pclk);
> + if (ret < 0) {
> + dev_err(dev, "failed to prepare pclk_lvds\n");
> + return ret;
> + }
> + }
> + ret = component_add(&pdev->dev, &rockchip_lvds_component_ops);
> + if (ret < 0) {
> + if (lvds->pclk)
> + clk_unprepare(lvds->pclk);
> + }
> +
> + return ret;
> +}
> +
> +static int rockchip_lvds_remove(struct platform_device *pdev)
> +{
> + struct rockchip_lvds *lvds = dev_get_drvdata(&pdev->dev);
> +
> + component_del(&pdev->dev, &rockchip_lvds_component_ops);
> + if (lvds->pclk)
> + clk_unprepare(lvds->pclk);
> +
> + return 0;
> +}
> +
> +struct platform_driver rockchip_lvds_driver = {
> + .probe = rockchip_lvds_probe,
> + .remove = rockchip_lvds_remove,
> + .driver = {
> + .name = "rockchip-lvds",
> + .of_match_table = of_match_ptr(rockchip_lvds_dt_ids),
> + },
> +};
> diff --git a/drivers/gpu/drm/rockchip/rockchip_lvds.h b/drivers/gpu/drm/rockchip/rockchip_lvds.h
> new file mode 100644
> index 0000000..49d2422
> --- /dev/null
> +++ b/drivers/gpu/drm/rockchip/rockchip_lvds.h
> @@ -0,0 +1,112 @@
> +/*
> + * Copyright (C) Fuzhou Rockchip Electronics Co.Ltd
> + * Author:
> + * hjc <hjc@xxxxxxxxxxxxxx>
> + * mark yao <mark.yao@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 _ROCKCHIP_LVDS_
> +#define _ROCKCHIP_LVDS_
> +
> +#define RK3288_LVDS_CH0_REG0 0x00
> +#define RK3288_LVDS_CH0_REG0_LVDS_EN BIT(7)
> +#define RK3288_LVDS_CH0_REG0_TTL_EN BIT(6)
> +#define RK3288_LVDS_CH0_REG0_LANECK_EN BIT(5)
> +#define RK3288_LVDS_CH0_REG0_LANE4_EN BIT(4)
> +#define RK3288_LVDS_CH0_REG0_LANE3_EN BIT(3)
> +#define RK3288_LVDS_CH0_REG0_LANE2_EN BIT(2)
> +#define RK3288_LVDS_CH0_REG0_LANE1_EN BIT(1)
> +#define RK3288_LVDS_CH0_REG0_LANE0_EN BIT(0)
> +
> +#define RK3288_LVDS_CH0_REG1 0x04
> +#define RK3288_LVDS_CH0_REG1_LANECK_BIAS BIT(5)
> +#define RK3288_LVDS_CH0_REG1_LANE4_BIAS BIT(4)
> +#define RK3288_LVDS_CH0_REG1_LANE3_BIAS BIT(3)
> +#define RK3288_LVDS_CH0_REG1_LANE2_BIAS BIT(2)
> +#define RK3288_LVDS_CH0_REG1_LANE1_BIAS BIT(1)
> +#define RK3288_LVDS_CH0_REG1_LANE0_BIAS BIT(0)
> +
> +#define RK3288_LVDS_CH0_REG2 0x08
> +#define RK3288_LVDS_CH0_REG2_RESERVE_ON BIT(7)
> +#define RK3288_LVDS_CH0_REG2_LANECK_LVDS_MODE BIT(6)
> +#define RK3288_LVDS_CH0_REG2_LANE4_LVDS_MODE BIT(5)
> +#define RK3288_LVDS_CH0_REG2_LANE3_LVDS_MODE BIT(4)
> +#define RK3288_LVDS_CH0_REG2_LANE2_LVDS_MODE BIT(3)
> +#define RK3288_LVDS_CH0_REG2_LANE1_LVDS_MODE BIT(2)
> +#define RK3288_LVDS_CH0_REG2_LANE0_LVDS_MODE BIT(1)
> +#define RK3288_LVDS_CH0_REG2_PLL_FBDIV8 BIT(0)
> +
> +#define RK3288_LVDS_CH0_REG3 0x0c
> +#define RK3288_LVDS_CH0_REG3_PLL_FBDIV_MASK 0xff
> +
> +#define RK3288_LVDS_CH0_REG4 0x10
> +#define RK3288_LVDS_CH0_REG4_LANECK_TTL_MODE BIT(5)
> +#define RK3288_LVDS_CH0_REG4_LANE4_TTL_MODE BIT(4)
> +#define RK3288_LVDS_CH0_REG4_LANE3_TTL_MODE BIT(3)
> +#define RK3288_LVDS_CH0_REG4_LANE2_TTL_MODE BIT(2)
> +#define RK3288_LVDS_CH0_REG4_LANE1_TTL_MODE BIT(1)
> +#define RK3288_LVDS_CH0_REG4_LANE0_TTL_MODE BIT(0)
> +
> +#define RK3288_LVDS_CH0_REG5 0x14
> +#define RK3288_LVDS_CH0_REG5_LANECK_TTL_DATA BIT(5)
> +#define RK3288_LVDS_CH0_REG5_LANE4_TTL_DATA BIT(4)
> +#define RK3288_LVDS_CH0_REG5_LANE3_TTL_DATA BIT(3)
> +#define RK3288_LVDS_CH0_REG5_LANE2_TTL_DATA BIT(2)
> +#define RK3288_LVDS_CH0_REG5_LANE1_TTL_DATA BIT(1)
> +#define RK3288_LVDS_CH0_REG5_LANE0_TTL_DATA BIT(0)
> +
> +#define RK3288_LVDS_CFG_REGC 0x30
> +#define RK3288_LVDS_CFG_REGC_PLL_ENABLE 0x00
> +#define RK3288_LVDS_CFG_REGC_PLL_DISABLE 0xff
> +
> +#define RK3288_LVDS_CH0_REGD 0x34
> +#define RK3288_LVDS_CH0_REGD_PLL_PREDIV_MASK 0x1f
> +
> +#define RK3288_LVDS_CH0_REG20 0x80
> +#define RK3288_LVDS_CH0_REG20_MSB 0x45
> +#define RK3288_LVDS_CH0_REG20_LSB 0x44
> +
> +#define RK3288_LVDS_CFG_REG21 0x84
> +#define RK3288_LVDS_CFG_REG21_TX_ENABLE 0x92
> +#define RK3288_LVDS_CFG_REG21_TX_DISABLE 0x00
> +#define RK3288_LVDS_CH1_OFFSET 0x100
> +
> +/* fbdiv value is split over 2 registers, with bit8 in reg2 */
> +#define RK3288_LVDS_PLL_FBDIV_REG2(_fbd) \
> + (_fbd & BIT(8) ? RK3288_LVDS_CH0_REG2_PLL_FBDIV8 : 0)
> +#define RK3288_LVDS_PLL_FBDIV_REG3(_fbd) \
> + (_fbd & RK3288_LVDS_CH0_REG3_PLL_FBDIV_MASK)
> +#define RK3288_LVDS_PLL_PREDIV_REGD(_pd) \
> + (_pd & RK3288_LVDS_CH0_REGD_PLL_PREDIV_MASK)
> +
> +#define RK3288_LVDS_SOC_CON6_SEL_VOP_LIT BIT(3)
> +
> +#define LVDS_FMT_MASK (0x07 << 16)
> +#define LVDS_MSB BIT(3)
> +#define LVDS_DUAL BIT(4)
> +#define LVDS_FMT_1 BIT(5)
> +#define LVDS_TTL_EN BIT(6)
> +#define LVDS_START_PHASE_RST_1 BIT(7)
> +#define LVDS_DCLK_INV BIT(8)
> +#define LVDS_CH0_EN BIT(11)
> +#define LVDS_CH1_EN BIT(12)
> +#define LVDS_PWRDN BIT(15)
> +
> +#define LVDS_24BIT (0 << 1)
> +#define LVDS_18BIT (1 << 1)
> +#define LVDS_FORMAT_VESA (0 << 0)
> +#define LVDS_FORMAT_JEIDA (1 << 0)
> +
> +enum rockchip_lvds_sub_devtype {
> + RK3288_LVDS,
> +};
> +#endif /* _ROCKCHIP_LVDS_ */
> --
> 2.7.4
>
>
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--
Sean Paul, Software Engineer, Google / Chromium OS