Re: [PATCH 6/6] drm/meson: add support for MIPI-DSI transceiver

From: Daniel Vetter
Date: Tue Sep 08 2020 - 04:47:02 EST

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On Tue, Sep 08, 2020 at 10:06:03AM +0200, Neil Armstrong wrote:
> Hi,
>
> On 07/09/2020 20:03, Daniel Vetter wrote:
> > On Mon, Sep 07, 2020 at 11:03:29AM +0200, Neil Armstrong wrote:
> >> On 07/09/2020 10:44, Daniel Vetter wrote:
> >>> On Mon, Sep 07, 2020 at 10:43:51AM +0200, Daniel Vetter wrote:
> >>>> On Mon, Sep 07, 2020 at 10:18:25AM +0200, Neil Armstrong wrote:
> >>>>> The Amlogic AXg SoCs embeds a Synopsys DW-MIPI-DSI transceiver (ver 1.21a), with a custom
> >>>>> glue managing the IP resets, clock and data input similar to the DW-HDMI Glue on other
> >>>>> Amlogic SoCs.
> >>>>>
> >>>>> This adds support for the Glue managing the transceiver, mimicing the init flow provided
> >>>>> by Amlogic to setup the ENCl encoder, the glue, the transceiver, the digital D-PHY and the
> >>>>> Analog PHY in the proper way.
> >>>>>
> >>>>> The DW-MIPI-DSI transceiver + D-PHY are directly clocked by the VCLK2 clock, which pixel clock
> >>>>> is derived and feeds the ENCL encoder and the VIU pixel reader.
> >>>>>
> >>>>> An optional "MEAS" clock can be enabled to measure the delay between each vsync feeding the
> >>>>> DW-MIPI-DSI transceiver.
> >>>>>
> >>>>> Signed-off-by: Neil Armstrong <narmstrong@xxxxxxxxxxxx>
> >>>>
> >>>> More dw-hdmi drivers which aren't bridges but components, and the thing is
> >>>> still midlayer-y as heck :-/
> >>>
> >>> *dw-dsi, but really they both work the same way and should both be fixed
> >>> ...
> >>
> >> They are bridges but since they have platform-dependent code due to theirs's generic IP
> >> nature, they need to be intanciated by components to sync with the platform code.
> >
> > Yeah that's how it currently works, but there's not much reason why it
> > needs to work like that. That platform glue code can also be put behind
> > the drm_bridge abstraction, and we could use the normal dt based bridge
> > lookup like for everything else.
> >
> > Afaiui the only reason dw-* bridge drivers work like that is because for
> > historical reasons we only had component.c at first, and none of the more
> > fancy dynamic bridge lookup. So would be really good to switch this all
> > over to a proper&clean bridge abstraction, and not leak everything around.
>
> Does it mean we should avoit using components, right ?

Yup, at least when there's an established specific mechanism to handle
cross-driver interactions/EPROBE_DEFER.

So if you want a drm_panel or drm_bridge or a clock or i2c or anything
else standardized like that, no component.c please. That's just for the
driver-specific glue when you have entirely IP-specific way of building up
a driver from components, which will never be reused outside of that
overall driver.

Hence why dw-* using components is rather uncool.

> > I've typed up what I think should be the way forward a few times already,
> > but thus far not even the todo.rst entry materialized:
> >
> > https://lore.kernel.org/dri-devel/20200430135841.GE10381@phenom.ffwll.local/
> >
> > If everyone is always about "not in my patch series" it'll never happen.
>
> Today, the dw-mipi-dsi and dw-mipi-hdmi has mandatory callbacks to implement
> vendor specific features, like :
> - hdmi/dsi phy handling when mixed into the glue/custom/synopsys but with platform specific values
> - platform specific mode validation
> - hpd setup => could use laurent's work here with no_connector, but how do we handle rxsense ???
> - dsi timings/lane mbps ? these are platform phy specific
>
> For amlogic, I can split the "component" code handling venc/vclk into a primary bridge and add a
> secondary driver only handling the glue around dw-mipi-dsi/dw-mipi-hdmi, would that be a good start ?

I think what we should do here:

- type up todo.rst with the overall structure we want to aim for, i.e.
where is the code, who sets up what, how are the bridges bound into the
overall driver.

- demidlayer dw-* enough so that the callbacks are gone, and it becomes
more a toolbox/library for building a dw-* driver. Maybe we're there
already.

- All new drivers then need to use the toolbox and have everything behind
a drm_bridge driver in drm/bridge/, with just default binding exposed to
drivers, no EXPORT_SYMBOL at all. Also no exported symbols used, this
should all be directly linked into the dw-*.ko imo and treated as
internals.

- We might need to split the header files to make that clean enough.

- Once all existing dw-* users are converted, we ditch the EXPORT_SYMBOL
stuff completely (since I expect we'll just have one overall dw-dsi.ko
module with all bridge driver variants).

Cheers, Daniel

>
> Neil
>
> >
> > Cheers, Daniel
> >
> >
> >>
> >> Neil
> >>
> >>>
> >>>>
> >>>> Can we try to fix this? There's a ton of this going on, and the more we
> >>>> add the old fashioned way the harder this gets to fix up for real.
> >>>> -Daniel
> >>>>
> >>>>> ---
> >>>>> drivers/gpu/drm/meson/Kconfig | 7 +
> >>>>> drivers/gpu/drm/meson/Makefile | 1 +
> >>>>> drivers/gpu/drm/meson/meson_dw_mipi_dsi.c | 562 ++++++++++++++++++++++
> >>>>> 3 files changed, 570 insertions(+)
> >>>>> create mode 100644 drivers/gpu/drm/meson/meson_dw_mipi_dsi.c
> >>>>>
> >>>>> diff --git a/drivers/gpu/drm/meson/Kconfig b/drivers/gpu/drm/meson/Kconfig
> >>>>> index 9f9281dd49f8..385f6f23839b 100644
> >>>>> --- a/drivers/gpu/drm/meson/Kconfig
> >>>>> +++ b/drivers/gpu/drm/meson/Kconfig
> >>>>> @@ -16,3 +16,10 @@ config DRM_MESON_DW_HDMI
> >>>>> default y if DRM_MESON
> >>>>> select DRM_DW_HDMI
> >>>>> imply DRM_DW_HDMI_I2S_AUDIO
> >>>>> +
> >>>>> +config DRM_MESON_DW_MIPI_DSI
> >>>>> + tristate "MIPI DSI Synopsys Controller support for Amlogic Meson Display"
> >>>>> + depends on DRM_MESON
> >>>>> + default y if DRM_MESON
> >>>>> + select DRM_DW_MIPI_DSI
> >>>>> + select GENERIC_PHY_MIPI_DPHY
> >>>>> diff --git a/drivers/gpu/drm/meson/Makefile b/drivers/gpu/drm/meson/Makefile
> >>>>> index 28a519cdf66b..2cc870e91182 100644
> >>>>> --- a/drivers/gpu/drm/meson/Makefile
> >>>>> +++ b/drivers/gpu/drm/meson/Makefile
> >>>>> @@ -5,3 +5,4 @@ meson-drm-y += meson_rdma.o meson_osd_afbcd.o
> >>>>>
> >>>>> obj-$(CONFIG_DRM_MESON) += meson-drm.o
> >>>>> obj-$(CONFIG_DRM_MESON_DW_HDMI) += meson_dw_hdmi.o
> >>>>> +obj-$(CONFIG_DRM_MESON_DW_MIPI_DSI) += meson_dw_mipi_dsi.o
> >>>>> diff --git a/drivers/gpu/drm/meson/meson_dw_mipi_dsi.c b/drivers/gpu/drm/meson/meson_dw_mipi_dsi.c
> >>>>> new file mode 100644
> >>>>> index 000000000000..bbe1294fce7c
> >>>>> --- /dev/null
> >>>>> +++ b/drivers/gpu/drm/meson/meson_dw_mipi_dsi.c
> >>>>> @@ -0,0 +1,562 @@
> >>>>> +// SPDX-License-Identifier: GPL-2.0-or-later
> >>>>> +/*
> >>>>> + * Copyright (C) 2016 BayLibre, SAS
> >>>>> + * Author: Neil Armstrong <narmstrong@xxxxxxxxxxxx>
> >>>>> + * Copyright (C) 2015 Amlogic, Inc. All rights reserved.
> >>>>> + */
> >>>>> +
> >>>>> +#include <linux/clk.h>
> >>>>> +#include <linux/component.h>
> >>>>> +#include <linux/kernel.h>
> >>>>> +#include <linux/module.h>
> >>>>> +#include <linux/of_device.h>
> >>>>> +#include <linux/of_graph.h>
> >>>>> +#include <linux/reset.h>
> >>>>> +#include <linux/phy/phy.h>
> >>>>> +
> >>>>> +#include <video/mipi_display.h>
> >>>>> +
> >>>>> +#include <drm/bridge/dw_mipi_dsi.h>
> >>>>> +#include <drm/drm_mipi_dsi.h>
> >>>>> +
> >>>>> +#include <drm/drm_atomic_helper.h>
> >>>>> +#include <drm/drm_device.h>
> >>>>> +#include <drm/drm_probe_helper.h>
> >>>>> +#include <drm/drm_print.h>
> >>>>> +
> >>>>> +#include "meson_drv.h"
> >>>>> +#include "meson_dw_mipi_dsi.h"
> >>>>> +#include "meson_registers.h"
> >>>>> +#include "meson_venc.h"
> >>>>> +
> >>>>> +#define DRIVER_NAME "meson-dw-mipi-dsi"
> >>>>> +#define DRIVER_DESC "Amlogic Meson MIPI-DSI DRM driver"
> >>>>> +
> >>>>> +/* MIPI DSI/VENC Color Format Definitions */
> >>>>> +#define MIPI_DSI_VENC_COLOR_30B 0x0
> >>>>> +#define MIPI_DSI_VENC_COLOR_24B 0x1
> >>>>> +#define MIPI_DSI_VENC_COLOR_18B 0x2
> >>>>> +#define MIPI_DSI_VENC_COLOR_16B 0x3
> >>>>> +
> >>>>> +#define COLOR_16BIT_CFG_1 0x0
> >>>>> +#define COLOR_16BIT_CFG_2 0x1
> >>>>> +#define COLOR_16BIT_CFG_3 0x2
> >>>>> +#define COLOR_18BIT_CFG_1 0x3
> >>>>> +#define COLOR_18BIT_CFG_2 0x4
> >>>>> +#define COLOR_24BIT 0x5
> >>>>> +#define COLOR_20BIT_LOOSE 0x6
> >>>>> +#define COLOR_24_BIT_YCBCR 0x7
> >>>>> +#define COLOR_16BIT_YCBCR 0x8
> >>>>> +#define COLOR_30BIT 0x9
> >>>>> +#define COLOR_36BIT 0xa
> >>>>> +#define COLOR_12BIT 0xb
> >>>>> +#define COLOR_RGB_111 0xc
> >>>>> +#define COLOR_RGB_332 0xd
> >>>>> +#define COLOR_RGB_444 0xe
> >>>>> +
> >>>>> +/* MIPI DSI Relative REGISTERs Definitions */
> >>>>> +/* For MIPI_DSI_TOP_CNTL */
> >>>>> +#define BIT_DPI_COLOR_MODE 20
> >>>>> +#define BIT_IN_COLOR_MODE 16
> >>>>> +#define BIT_CHROMA_SUBSAMPLE 14
> >>>>> +#define BIT_COMP2_SEL 12
> >>>>> +#define BIT_COMP1_SEL 10
> >>>>> +#define BIT_COMP0_SEL 8
> >>>>> +#define BIT_DE_POL 6
> >>>>> +#define BIT_HSYNC_POL 5
> >>>>> +#define BIT_VSYNC_POL 4
> >>>>> +#define BIT_DPICOLORM 3
> >>>>> +#define BIT_DPISHUTDN 2
> >>>>> +#define BIT_EDPITE_INTR_PULSE 1
> >>>>> +#define BIT_ERR_INTR_PULSE 0
> >>>>> +
> >>>>> +/* HHI Registers */
> >>>>> +#define HHI_VIID_CLK_DIV 0x128 /* 0x4a offset in data sheet */
> >>>>> +#define VCLK2_DIV_MASK 0xff
> >>>>> +#define VCLK2_DIV_EN BIT(16)
> >>>>> +#define VCLK2_DIV_RESET BIT(17)
> >>>>> +#define CTS_ENCL_SEL_MASK (0xf << 12)
> >>>>> +#define CTS_ENCL_SEL_SHIFT 12
> >>>>> +#define HHI_VIID_CLK_CNTL 0x12c /* 0x4b offset in data sheet */
> >>>>> +#define VCLK2_EN BIT(19)
> >>>>> +#define VCLK2_SEL_MASK (0x7 << 16)
> >>>>> +#define VCLK2_SEL_SHIFT 16
> >>>>> +#define VCLK2_SOFT_RESET BIT(15)
> >>>>> +#define VCLK2_DIV1_EN BIT(0)
> >>>>> +#define HHI_VID_CLK_CNTL2 0x194 /* 0x65 offset in data sheet */
> >>>>> +#define CTS_ENCL_EN BIT(3)
> >>>>> +
> >>>>> +/**
> >>>>> + * DOC: MIPI DSI
> >>>>> + *
> >>>>> + */
> >>>>> +
> >>>>> +struct meson_dw_mipi_dsi {
> >>>>> + struct drm_encoder encoder;
> >>>>> + struct meson_drm *priv;
> >>>>> + struct device *dev;
> >>>>> + void __iomem *base;
> >>>>> + struct phy *phy;
> >>>>> + union phy_configure_opts phy_opts;
> >>>>> + struct dw_mipi_dsi *dmd;
> >>>>> + struct dw_mipi_dsi_plat_data pdata;
> >>>>> + struct mipi_dsi_device *dsi_device;
> >>>>> + unsigned long mode_flags;
> >>>>> + struct clk *px_clk;
> >>>>> +};
> >>>>> +#define encoder_to_meson_dw_mipi_dsi(x) \
> >>>>> + container_of(x, struct meson_dw_mipi_dsi, encoder)
> >>>>> +
> >>>>> +static void dw_mipi_dsi_set_vclk(struct meson_dw_mipi_dsi *mipi_dsi,
> >>>>> + struct drm_display_mode *mode)
> >>>>> +{
> >>>>> + struct meson_drm *priv = mipi_dsi->priv;
> >>>>> + unsigned int vclk2_div;
> >>>>> + unsigned int pll_rate;
> >>>>> + int ret;
> >>>>> +
> >>>>> + pll_rate = mipi_dsi->phy_opts.mipi_dphy.hs_clk_rate;
> >>>>> + vclk2_div = pll_rate / (mode->clock * 1000);
> >>>>> +
> >>>>> + ret = clk_set_rate(mipi_dsi->px_clk, pll_rate);
> >>>>> + if (ret) {
> >>>>> + pr_err("Failed to set DSI PLL rate %lu\n",
> >>>>> + mipi_dsi->phy_opts.mipi_dphy.hs_clk_rate);
> >>>>> +
> >>>>> + return;
> >>>>> + }
> >>>>> +
> >>>>> + /* Disable VCLK2 */
> >>>>> + regmap_update_bits(priv->hhi, HHI_VIID_CLK_CNTL, VCLK2_EN, 0);
> >>>>> +
> >>>>> + /* Setup the VCLK2 divider value */
> >>>>> + regmap_update_bits(priv->hhi, HHI_VIID_CLK_DIV,
> >>>>> + VCLK2_DIV_MASK, (vclk2_div - 1));
> >>>>> +
> >>>>> + /* select gp0 for vclk2 */
> >>>>> + regmap_update_bits(priv->hhi, HHI_VIID_CLK_CNTL,
> >>>>> + VCLK2_SEL_MASK, (0 << VCLK2_SEL_SHIFT));
> >>>>> +
> >>>>> + /* enable vclk2 gate */
> >>>>> + regmap_update_bits(priv->hhi, HHI_VIID_CLK_CNTL, VCLK2_EN, VCLK2_EN);
> >>>>> +
> >>>>> + /* select vclk2_div1 for encl */
> >>>>> + regmap_update_bits(priv->hhi, HHI_VIID_CLK_DIV,
> >>>>> + CTS_ENCL_SEL_MASK, (8 << CTS_ENCL_SEL_SHIFT));
> >>>>> +
> >>>>> + /* release vclk2_div_reset and enable vclk2_div */
> >>>>> + regmap_update_bits(priv->hhi, HHI_VIID_CLK_DIV,
> >>>>> + VCLK2_DIV_EN | VCLK2_DIV_RESET, VCLK2_DIV_EN);
> >>>>> +
> >>>>> + /* enable vclk2_div1 gate */
> >>>>> + regmap_update_bits(priv->hhi, HHI_VIID_CLK_CNTL,
> >>>>> + VCLK2_DIV1_EN, VCLK2_DIV1_EN);
> >>>>> +
> >>>>> + /* reset vclk2 */
> >>>>> + regmap_update_bits(priv->hhi, HHI_VIID_CLK_CNTL,
> >>>>> + VCLK2_SOFT_RESET, VCLK2_SOFT_RESET);
> >>>>> + regmap_update_bits(priv->hhi, HHI_VIID_CLK_CNTL,
> >>>>> + VCLK2_SOFT_RESET, 0);
> >>>>> +
> >>>>> + /* enable encl_clk */
> >>>>> + regmap_update_bits(priv->hhi, HHI_VID_CLK_CNTL2,
> >>>>> + CTS_ENCL_EN, CTS_ENCL_EN);
> >>>>> +
> >>>>> + usleep_range(10000, 11000);
> >>>>> +}
> >>>>> +
> >>>>> +static int dw_mipi_dsi_phy_init(void *priv_data)
> >>>>> +{
> >>>>> + struct meson_dw_mipi_dsi *mipi_dsi = priv_data;
> >>>>> + struct meson_drm *priv = mipi_dsi->priv;
> >>>>> +
> >>>>> +
> >>>>> + phy_power_on(mipi_dsi->phy);
> >>>>> +
> >>>>> + writel_relaxed(1, priv->io_base + _REG(ENCL_VIDEO_EN));
> >>>>> +
> >>>>> + return 0;
> >>>>> +}
> >>>>> +
> >>>>> +static void dw_mipi_dsi_phy_power_off(void *priv_data)
> >>>>> +{
> >>>>> + struct meson_dw_mipi_dsi *mipi_dsi = priv_data;
> >>>>> +
> >>>>> + phy_power_off(mipi_dsi->phy);
> >>>>> +}
> >>>>> +
> >>>>> +static int
> >>>>> +dw_mipi_dsi_get_lane_mbps(void *priv_data, const struct drm_display_mode *mode,
> >>>>> + unsigned long mode_flags, u32 lanes, u32 format,
> >>>>> + unsigned int *lane_mbps)
> >>>>> +{
> >>>>> + struct meson_dw_mipi_dsi *mipi_dsi = priv_data;
> >>>>> +
> >>>>> + *lane_mbps = mipi_dsi->phy_opts.mipi_dphy.hs_clk_rate / 1000000;
> >>>>> +
> >>>>> + return 0;
> >>>>> +}
> >>>>> +
> >>>>> +static int
> >>>>> +dw_mipi_dsi_phy_get_timing(void *priv_data, unsigned int lane_mbps,
> >>>>> + struct dw_mipi_dsi_dphy_timing *timing)
> >>>>> +{
> >>>>> + /* TOFIX handle other cases */
> >>>>> +
> >>>>> + timing->clk_lp2hs = 37;
> >>>>> + timing->clk_hs2lp = 135;
> >>>>> + timing->data_lp2hs = 50;
> >>>>> + timing->data_hs2lp = 3;
> >>>>> +
> >>>>> + return 0;
> >>>>> +}
> >>>>> +
> >>>>> +static int
> >>>>> +dw_mipi_dsi_get_esc_clk_rate(void *priv_data, unsigned int *esc_clk_rate)
> >>>>> +{
> >>>>> + *esc_clk_rate = 4; /* Mhz */
> >>>>> +
> >>>>> + return 0;
> >>>>> +}
> >>>>> +
> >>>>> +static const struct dw_mipi_dsi_phy_ops meson_dw_mipi_dsi_phy_ops = {
> >>>>> + .init = dw_mipi_dsi_phy_init,
> >>>>> + .power_off = dw_mipi_dsi_phy_power_off,
> >>>>> + .get_lane_mbps = dw_mipi_dsi_get_lane_mbps,
> >>>>> + .get_timing = dw_mipi_dsi_phy_get_timing,
> >>>>> + .get_esc_clk_rate = dw_mipi_dsi_get_esc_clk_rate,
> >>>>> +};
> >>>>> +
> >>>>> +/* Encoder */
> >>>>> +
> >>>>> +static void meson_mipi_dsi_encoder_destroy(struct drm_encoder *encoder)
> >>>>> +{
> >>>>> + drm_encoder_cleanup(encoder);
> >>>>> +}
> >>>>> +
> >>>>> +static const struct drm_encoder_funcs meson_mipi_dsi_encoder_funcs = {
> >>>>> + .destroy = meson_mipi_dsi_encoder_destroy,
> >>>>> +};
> >>>>> +
> >>>>> +static int meson_mipi_dsi_encoder_atomic_check(struct drm_encoder *encoder,
> >>>>> + struct drm_crtc_state *crtc_state,
> >>>>> + struct drm_connector_state *conn_state)
> >>>>> +{
> >>>>> + struct meson_dw_mipi_dsi *mipi_dsi =
> >>>>> + encoder_to_meson_dw_mipi_dsi(encoder);
> >>>>> +
> >>>>> + switch (mipi_dsi->dsi_device->format) {
> >>>>> + case MIPI_DSI_FMT_RGB888:
> >>>>> + break;
> >>>>> + case MIPI_DSI_FMT_RGB666:
> >>>>> + break;
> >>>>> + case MIPI_DSI_FMT_RGB666_PACKED:
> >>>>> + case MIPI_DSI_FMT_RGB565:
> >>>>> + default:
> >>>>> + DRM_DEV_ERROR(mipi_dsi->dev,
> >>>>> + "invalid pixel format %d\n",
> >>>>> + mipi_dsi->dsi_device->format);
> >>>>> + return -EINVAL;
> >>>>> + };
> >>>>> +
> >>>>> + return 0;
> >>>>> +}
> >>>>> +
> >>>>> +static void meson_mipi_dsi_encoder_disable(struct drm_encoder *encoder)
> >>>>> +{
> >>>>> + struct meson_dw_mipi_dsi *mipi_dsi =
> >>>>> + encoder_to_meson_dw_mipi_dsi(encoder);
> >>>>> + struct meson_drm *priv = mipi_dsi->priv;
> >>>>> +
> >>>>> + writel_relaxed(0, priv->io_base + _REG(ENCL_VIDEO_EN));
> >>>>> +}
> >>>>> +
> >>>>> +static void meson_mipi_dsi_encoder_enable(struct drm_encoder *encoder)
> >>>>> +{
> >>>>> + struct meson_dw_mipi_dsi *mipi_dsi =
> >>>>> + encoder_to_meson_dw_mipi_dsi(encoder);
> >>>>> + struct meson_drm *priv = mipi_dsi->priv;
> >>>>> +
> >>>>> + writel_bits_relaxed(BIT(3), BIT(3),
> >>>>> + priv->io_base + _REG(ENCL_VIDEO_MODE_ADV));
> >>>>> + writel_relaxed(0, priv->io_base + _REG(ENCL_TST_EN));
> >>>>> +}
> >>>>> +
> >>>>> +static void meson_dw_mipi_dsi_init(struct meson_dw_mipi_dsi *mipi_dsi)
> >>>>> +{
> >>>>> + writel_relaxed((1 << 4) | (1 << 5) | (0 << 6),
> >>>>> + mipi_dsi->base + MIPI_DSI_TOP_CNTL);
> >>>>> +
> >>>>> + writel_bits_relaxed(0xf, 0xf,
> >>>>> + mipi_dsi->base + MIPI_DSI_TOP_SW_RESET);
> >>>>> + writel_bits_relaxed(0xf, 0,
> >>>>> + mipi_dsi->base + MIPI_DSI_TOP_SW_RESET);
> >>>>> +
> >>>>> + writel_bits_relaxed(0x3, 0x3,
> >>>>> + mipi_dsi->base + MIPI_DSI_TOP_CLK_CNTL);
> >>>>> +
> >>>>> + writel_relaxed(0, mipi_dsi->base + MIPI_DSI_TOP_MEM_PD);
> >>>>> +}
> >>>>> +
> >>>>> +static void meson_mipi_dsi_encoder_mode_set(struct drm_encoder *encoder,
> >>>>> + struct drm_display_mode *mode,
> >>>>> + struct drm_display_mode *adjusted_mode)
> >>>>> +{
> >>>>> + struct meson_dw_mipi_dsi *mipi_dsi = encoder_to_meson_dw_mipi_dsi(encoder);
> >>>>> + unsigned int dpi_data_format, venc_data_width;
> >>>>> + struct meson_drm *priv = mipi_dsi->priv;
> >>>>> + int bpp;
> >>>>> + u32 reg;
> >>>>> +
> >>>>> + mipi_dsi->mode_flags = mode->flags;
> >>>>> +
> >>>>> + bpp = mipi_dsi_pixel_format_to_bpp(mipi_dsi->dsi_device->format);
> >>>>> +
> >>>>> + phy_mipi_dphy_get_default_config(mode->clock * 1000,
> >>>>> + bpp, mipi_dsi->dsi_device->lanes,
> >>>>> + &mipi_dsi->phy_opts.mipi_dphy);
> >>>>> +
> >>>>> + phy_configure(mipi_dsi->phy, &mipi_dsi->phy_opts);
> >>>>> +
> >>>>> + switch (mipi_dsi->dsi_device->format) {
> >>>>> + case MIPI_DSI_FMT_RGB888:
> >>>>> + dpi_data_format = COLOR_24BIT;
> >>>>> + venc_data_width = MIPI_DSI_VENC_COLOR_24B;
> >>>>> + break;
> >>>>> + case MIPI_DSI_FMT_RGB666:
> >>>>> + dpi_data_format = COLOR_18BIT_CFG_2;
> >>>>> + venc_data_width = MIPI_DSI_VENC_COLOR_18B;
> >>>>> + break;
> >>>>> + case MIPI_DSI_FMT_RGB666_PACKED:
> >>>>> + case MIPI_DSI_FMT_RGB565:
> >>>>> + /* invalid */
> >>>>> + break;
> >>>>> + };
> >>>>> +
> >>>>> + dw_mipi_dsi_set_vclk(mipi_dsi, mode);
> >>>>> + meson_venc_mipi_dsi_mode_set(priv, mode);
> >>>>> +
> >>>>> + meson_encl_load_gamma(priv);
> >>>>> +
> >>>>> + writel_relaxed(0, priv->io_base + _REG(ENCL_VIDEO_EN));
> >>>>> +
> >>>>> + meson_dw_mipi_dsi_init(mipi_dsi);
> >>>>> +
> >>>>> + /* Configure Set color format for DPI register */
> >>>>> + reg = readl_relaxed(mipi_dsi->base + MIPI_DSI_TOP_CNTL) &
> >>>>> + ~(0xf<<BIT_DPI_COLOR_MODE) &
> >>>>> + ~(0x7<<BIT_IN_COLOR_MODE) &
> >>>>> + ~(0x3<<BIT_CHROMA_SUBSAMPLE);
> >>>>> +
> >>>>> + writel_relaxed(reg |
> >>>>> + (dpi_data_format << BIT_DPI_COLOR_MODE) |
> >>>>> + (venc_data_width << BIT_IN_COLOR_MODE) |
> >>>>> + 0 << BIT_COMP0_SEL |
> >>>>> + 1 << BIT_COMP1_SEL |
> >>>>> + 2 << BIT_COMP2_SEL |
> >>>>> + (mipi_dsi->mode_flags & DRM_MODE_FLAG_NHSYNC ? 0 : BIT(BIT_HSYNC_POL)) |
> >>>>> + (mipi_dsi->mode_flags & DRM_MODE_FLAG_NVSYNC ? 0 : BIT(BIT_VSYNC_POL)),
> >>>>> + mipi_dsi->base + MIPI_DSI_TOP_CNTL);
> >>>>> +}
> >>>>> +
> >>>>> +static const struct drm_encoder_helper_funcs
> >>>>> + meson_mipi_dsi_encoder_helper_funcs = {
> >>>>> + .atomic_check = meson_mipi_dsi_encoder_atomic_check,
> >>>>> + .disable = meson_mipi_dsi_encoder_disable,
> >>>>> + .enable = meson_mipi_dsi_encoder_enable,
> >>>>> + .mode_set = meson_mipi_dsi_encoder_mode_set,
> >>>>> +};
> >>>>> +
> >>>>> +static int meson_dw_mipi_dsi_bind(struct device *dev, struct device *master,
> >>>>> + void *data)
> >>>>> +{
> >>>>> + struct meson_dw_mipi_dsi *mipi_dsi = dev_get_drvdata(dev);
> >>>>> + struct drm_device *drm = data;
> >>>>> + struct meson_drm *priv = drm->dev_private;
> >>>>> + struct drm_encoder *encoder;
> >>>>> + int ret;
> >>>>> +
> >>>>> + /* Check before if we are supposed to have a sub-device... */
> >>>>> + if (!mipi_dsi->dsi_device)
> >>>>> + return -EPROBE_DEFER;
> >>>>> +
> >>>>> + encoder = &mipi_dsi->encoder;
> >>>>> + mipi_dsi->priv = priv;
> >>>>> +
> >>>>> + /* Encoder */
> >>>>> + ret = drm_encoder_init(drm, encoder, &meson_mipi_dsi_encoder_funcs,
> >>>>> + DRM_MODE_ENCODER_DSI, "meson_mipi_dsi");
> >>>>> + if (ret) {
> >>>>> + dev_err(priv->dev, "Failed to init DSI encoder\n");
> >>>>> + return ret;
> >>>>> + }
> >>>>> +
> >>>>> + drm_encoder_helper_add(encoder, &meson_mipi_dsi_encoder_helper_funcs);
> >>>>> +
> >>>>> + encoder->possible_crtcs = BIT(0);
> >>>>> +
> >>>>> + ret = dw_mipi_dsi_bind(mipi_dsi->dmd, encoder);
> >>>>> + if (ret) {
> >>>>> + DRM_DEV_ERROR(dev, "Failed to bind: %d\n", ret);
> >>>>> + return ret;
> >>>>> + }
> >>>>> +
> >>>>> + phy_init(mipi_dsi->phy);
> >>>>> +
> >>>>> + return 0;
> >>>>> +}
> >>>>> +
> >>>>> +static void meson_dw_mipi_dsi_unbind(struct device *dev, struct device *master,
> >>>>> + void *data)
> >>>>> +{
> >>>>> + struct meson_dw_mipi_dsi *mipi_dsi = dev_get_drvdata(dev);
> >>>>> +
> >>>>> + dw_mipi_dsi_remove(mipi_dsi->dmd);
> >>>>> +
> >>>>> + phy_exit(mipi_dsi->phy);
> >>>>> +}
> >>>>> +
> >>>>> +static const struct component_ops meson_dw_mipi_dsi_ops = {
> >>>>> + .bind = meson_dw_mipi_dsi_bind,
> >>>>> + .unbind = meson_dw_mipi_dsi_unbind,
> >>>>> +};
> >>>>> +
> >>>>> +static int meson_dw_mipi_dsi_host_attach(void *priv_data,
> >>>>> + struct mipi_dsi_device *device)
> >>>>> +{
> >>>>> + struct meson_dw_mipi_dsi *mipi_dsi = priv_data;
> >>>>> +
> >>>>> + mipi_dsi->dsi_device = device;
> >>>>> +
> >>>>> + return 0;
> >>>>> +}
> >>>>> +
> >>>>> +static int meson_dw_mipi_dsi_host_detach(void *priv_data,
> >>>>> + struct mipi_dsi_device *device)
> >>>>> +{
> >>>>> + struct meson_dw_mipi_dsi *mipi_dsi = priv_data;
> >>>>> +
> >>>>> + if (device == mipi_dsi->dsi_device)
> >>>>> + mipi_dsi->dsi_device = NULL;
> >>>>> + else
> >>>>> + return -EINVAL;
> >>>>> +
> >>>>> + return 0;
> >>>>> +}
> >>>>> +
> >>>>> +static const struct dw_mipi_dsi_host_ops meson_dw_mipi_dsi_host_ops = {
> >>>>> + .attach = meson_dw_mipi_dsi_host_attach,
> >>>>> + .detach = meson_dw_mipi_dsi_host_detach,
> >>>>> +};
> >>>>> +
> >>>>> +static int meson_dw_mipi_dsi_probe(struct platform_device *pdev)
> >>>>> +{
> >>>>> + struct meson_dw_mipi_dsi *mipi_dsi;
> >>>>> + struct reset_control *top_rst;
> >>>>> + struct resource *res;
> >>>>> + int ret;
> >>>>> +
> >>>>> + mipi_dsi = devm_kzalloc(&pdev->dev, sizeof(*mipi_dsi), GFP_KERNEL);
> >>>>> + if (!mipi_dsi)
> >>>>> + return -ENOMEM;
> >>>>> +
> >>>>> + mipi_dsi->dev = &pdev->dev;
> >>>>> +
> >>>>> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> >>>>> + mipi_dsi->base = devm_ioremap_resource(&pdev->dev, res);
> >>>>> + if (IS_ERR(mipi_dsi->base))
> >>>>> + return PTR_ERR(mipi_dsi->base);
> >>>>> +
> >>>>> + mipi_dsi->phy = devm_phy_get(&pdev->dev, "dphy");
> >>>>> + if (IS_ERR(mipi_dsi->phy)) {
> >>>>> + ret = PTR_ERR(mipi_dsi->phy);
> >>>>> + dev_err(&pdev->dev, "failed to get mipi dphy: %d\n", ret);
> >>>>> + return ret;
> >>>>> + }
> >>>>> +
> >>>>> + mipi_dsi->px_clk = devm_clk_get(&pdev->dev, "px_clk");
> >>>>> + if (IS_ERR(mipi_dsi->px_clk)) {
> >>>>> + dev_err(&pdev->dev, "Unable to get PLL clk\n");
> >>>>> + return PTR_ERR(mipi_dsi->px_clk);
> >>>>> + }
> >>>>> +
> >>>>> + /*
> >>>>> + * We use a TOP reset signal because the APB reset signal
> >>>>> + * is handled by the TOP control registers.
> >>>>> + */
> >>>>> + top_rst = devm_reset_control_get_exclusive(&pdev->dev, "top");
> >>>>> + if (IS_ERR(top_rst)) {
> >>>>> + ret = PTR_ERR(top_rst);
> >>>>> +
> >>>>> + if (ret != -EPROBE_DEFER)
> >>>>> + dev_err(&pdev->dev, "Unable to get reset control: %d\n", ret);
> >>>>> +
> >>>>> + return ret;
> >>>>> + }
> >>>>> +
> >>>>> + ret = clk_prepare_enable(mipi_dsi->px_clk);
> >>>>> + if (ret) {
> >>>>> + dev_err(&pdev->dev, "Unable to prepare/enable PX clock\n");
> >>>>> + goto err_clkdisable;
> >>>>> + }
> >>>>> +
> >>>>> + reset_control_assert(top_rst);
> >>>>> + usleep_range(10, 20);
> >>>>> + reset_control_deassert(top_rst);
> >>>>> +
> >>>>> + /* MIPI DSI Controller */
> >>>>> +
> >>>>> + mipi_dsi->pdata.base = mipi_dsi->base;
> >>>>> + mipi_dsi->pdata.max_data_lanes = 4;
> >>>>> + mipi_dsi->pdata.phy_ops = &meson_dw_mipi_dsi_phy_ops;
> >>>>> + mipi_dsi->pdata.host_ops = &meson_dw_mipi_dsi_host_ops;
> >>>>> + mipi_dsi->pdata.priv_data = mipi_dsi;
> >>>>> + platform_set_drvdata(pdev, mipi_dsi);
> >>>>> +
> >>>>> + mipi_dsi->dmd = dw_mipi_dsi_probe(pdev, &mipi_dsi->pdata);
> >>>>> + if (IS_ERR(mipi_dsi->dmd)) {
> >>>>> + ret = PTR_ERR(mipi_dsi->dmd);
> >>>>> + if (ret != -EPROBE_DEFER)
> >>>>> + dev_err(&pdev->dev,
> >>>>> + "Failed to probe dw_mipi_dsi: %d\n", ret);
> >>>>> + goto err_clkdisable;
> >>>>> + }
> >>>>> +
> >>>>> + return component_add(mipi_dsi->dev, &meson_dw_mipi_dsi_ops);
> >>>>> +
> >>>>> +err_clkdisable:
> >>>>> + clk_disable_unprepare(mipi_dsi->px_clk);
> >>>>> +
> >>>>> + return ret;
> >>>>> +}
> >>>>> +
> >>>>> +static int meson_dw_mipi_dsi_remove(struct platform_device *pdev)
> >>>>> +{
> >>>>> + struct meson_dw_mipi_dsi *mipi_dsi = dev_get_drvdata(&pdev->dev);
> >>>>> +
> >>>>> + component_del(mipi_dsi->dev, &meson_dw_mipi_dsi_ops);
> >>>>> +
> >>>>> + clk_disable_unprepare(mipi_dsi->px_clk);
> >>>>> +
> >>>>> + return 0;
> >>>>> +}
> >>>>> +
> >>>>> +static const struct of_device_id meson_dw_mipi_dsi_of_table[] = {
> >>>>> + { .compatible = "amlogic,meson-axg-dw-mipi-dsi", },
> >>>>> + { }
> >>>>> +};
> >>>>> +MODULE_DEVICE_TABLE(of, meson_dw_mipi_dsi_of_table);
> >>>>> +
> >>>>> +static struct platform_driver meson_dw_mipi_dsi_platform_driver = {
> >>>>> + .probe = meson_dw_mipi_dsi_probe,
> >>>>> + .remove = meson_dw_mipi_dsi_remove,
> >>>>> + .driver = {
> >>>>> + .name = DRIVER_NAME,
> >>>>> + .of_match_table = meson_dw_mipi_dsi_of_table,
> >>>>> + },
> >>>>> +};
> >>>>> +module_platform_driver(meson_dw_mipi_dsi_platform_driver);
> >>>>> +
> >>>>> +MODULE_AUTHOR("Neil Armstrong <narmstrong@xxxxxxxxxxxx>");
> >>>>> +MODULE_DESCRIPTION(DRIVER_DESC);
> >>>>> +MODULE_LICENSE("GPL");
> >>>>> --
> >>>>> 2.22.0
> >>>>>
> >>>>
> >>>> --
> >>>> Daniel Vetter
> >>>> Software Engineer, Intel Corporation
> >>>> http://blog.ffwll.ch
> >>>
> >>
> >> _______________________________________________
> >> dri-devel mailing list
> >> dri-devel@xxxxxxxxxxxxxxxxxxxxx
> >> https://lists.freedesktop.org/mailman/listinfo/dri-devel
> >
>
> _______________________________________________
> dri-devel mailing list
> dri-devel@xxxxxxxxxxxxxxxxxxxxx
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch

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