Re: [PATCH v2 06/15] drm/mediatek: Add support for MT8195 Digital Parallel Interface

["CK Hu (胡俊光)" <ck.hu@mediatek.com>]

Hi, Angelo:

On Thu, 2024-12-05 at 12:45 +0100, AngeloGioacchino Del Regno wrote:
> External email : Please do not click links or open attachments until you have verified the sender or the content.
> 
> 
> Add support for the DPI block found in the MT8195 and MT8188 SoCs.
> Inside of the SoC, this block is directly connected to the HDMI IP.

Note: there is discussion in [1].

[1] https://patchwork.kernel.org/project/linux-mediatek/patch/20241120124420.133914-7-angelogioacchino.delregno@collabora.com/

Regards,
CK

> 
> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
> ---
>  drivers/gpu/drm/mediatek/mtk_dpi.c      | 55 ++++++++++++++++++++++---
>  drivers/gpu/drm/mediatek/mtk_dpi_regs.h |  6 +++
>  drivers/gpu/drm/mediatek/mtk_drm_drv.c  |  2 +
>  3 files changed, 58 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c b/drivers/gpu/drm/mediatek/mtk_dpi.c
> index 79923d1bfbc9..f76d1c5b68bd 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dpi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
> @@ -144,6 +144,7 @@ struct mtk_dpi_factor {
>   * @csc_enable_bit: Enable bit of CSC.
>   * @pixels_per_iter: Quantity of transferred pixels per iteration.
>   * @edge_cfg_in_mmsys: If the edge configuration for DPI's output needs to be set in MMSYS.
> + * @is_internal_hdmi: Specifies whether the DPI is internally connected to the HDMI block
>   */
>  struct mtk_dpi_conf {
>         const struct mtk_dpi_factor *dpi_factor;
> @@ -164,6 +165,7 @@ struct mtk_dpi_conf {
>         u32 csc_enable_bit;
>         u32 pixels_per_iter;
>         bool edge_cfg_in_mmsys;
> +       bool is_internal_hdmi;
>  };
> 
>  static void mtk_dpi_mask(struct mtk_dpi *dpi, u32 offset, u32 val, u32 mask)
> @@ -492,6 +494,7 @@ static void mtk_dpi_power_off(struct mtk_dpi *dpi)
> 
>         mtk_dpi_disable(dpi);
>         clk_disable_unprepare(dpi->pixel_clk);
> +       clk_disable_unprepare(dpi->tvd_clk);
>         clk_disable_unprepare(dpi->engine_clk);
>  }
> 
> @@ -508,6 +511,12 @@ static int mtk_dpi_power_on(struct mtk_dpi *dpi)
>                 goto err_refcount;
>         }
> 
> +       ret = clk_prepare_enable(dpi->tvd_clk);
> +       if (ret) {
> +               dev_err(dpi->dev, "Failed to enable tvd pll: %d\n", ret);
> +               goto err_engine;
> +       }
> +
>         ret = clk_prepare_enable(dpi->pixel_clk);
>         if (ret) {
>                 dev_err(dpi->dev, "Failed to enable pixel clock: %d\n", ret);
> @@ -517,6 +526,8 @@ static int mtk_dpi_power_on(struct mtk_dpi *dpi)
>         return 0;
> 
>  err_pixel:
> +       clk_disable_unprepare(dpi->tvd_clk);
> +err_engine:
>         clk_disable_unprepare(dpi->engine_clk);
>  err_refcount:
>         dpi->refcount--;
> @@ -584,7 +595,9 @@ static int mtk_dpi_set_display_mode(struct mtk_dpi *dpi,
>         struct videomode vm = { 0 };
> 
>         drm_display_mode_to_videomode(mode, &vm);
> -       mtk_dpi_set_pixel_clk(dpi, &vm, mode->clock);
> +
> +       if (!dpi->conf->is_internal_hdmi)
> +               mtk_dpi_set_pixel_clk(dpi, &vm, mode->clock);
> 
>         dpi_pol.ck_pol = MTK_DPI_POLARITY_FALLING;
>         dpi_pol.de_pol = MTK_DPI_POLARITY_RISING;
> @@ -647,10 +660,18 @@ static int mtk_dpi_set_display_mode(struct mtk_dpi *dpi,
>         if (dpi->conf->support_direct_pin) {
>                 mtk_dpi_config_yc_map(dpi, dpi->yc_map);
>                 mtk_dpi_config_2n_h_fre(dpi);
> -               mtk_dpi_dual_edge(dpi);
> +               /* DPI can connect to either an external bridge or the internal HDMI encoder */
> +               if (dpi->conf->is_internal_hdmi) {
> +                       mtk_dpi_mask(dpi, DPI_CON, DPI_OUTPUT_1T1P_EN, DPI_OUTPUT_1T1P_EN);
> +                       mtk_dpi_mask(dpi, DPI_CON,
> +                                    dpi->conf->input_2pixel ? DPI_INPUT_2P_EN : 0,
> +                                    DPI_INPUT_2P_EN);
> +               } else {
> +                       mtk_dpi_dual_edge(dpi);
> +               }
>                 mtk_dpi_config_disable_edge(dpi);
>         }
> -       if (dpi->conf->input_2pixel) {
> +       if (dpi->conf->input_2pixel && !dpi->conf->is_internal_hdmi) {
>                 mtk_dpi_mask(dpi, DPI_CON, DPINTF_INPUT_2P_EN,
>                              DPINTF_INPUT_2P_EN);
>         }
> @@ -919,14 +940,16 @@ void mtk_dpi_start(struct device *dev)
>  {
>         struct mtk_dpi *dpi = dev_get_drvdata(dev);
> 
> -       mtk_dpi_power_on(dpi);
> +       if (!dpi->conf->is_internal_hdmi)
> +               mtk_dpi_power_on(dpi);
>  }
> 
>  void mtk_dpi_stop(struct device *dev)
>  {
>         struct mtk_dpi *dpi = dev_get_drvdata(dev);
> 
> -       mtk_dpi_power_off(dpi);
> +       if (!dpi->conf->is_internal_hdmi)
> +               mtk_dpi_power_off(dpi);
>  }
> 
>  unsigned int mtk_dpi_encoder_index(struct device *dev)
> @@ -1021,6 +1044,8 @@ static const struct mtk_dpi_factor dpi_factor_mt8195_dp_intf[] = {
>         { 70000 - 1, 4 }, { 200000 - 1, 2 }, { U32_MAX, 1 }
>  };
> 
> +static const struct mtk_dpi_factor dpi_factor_mt8195_dpi = { U32_MAX, 1 };
> +
>  static const struct mtk_dpi_conf mt8173_conf = {
>         .dpi_factor = dpi_factor_mt8173,
>         .num_dpi_factor = ARRAY_SIZE(dpi_factor_mt8173),
> @@ -1113,6 +1138,25 @@ static const struct mtk_dpi_conf mt8192_conf = {
>         .csc_enable_bit = CSC_ENABLE,
>  };
> 
> +static const struct mtk_dpi_conf mt8195_conf = {
> +       .dpi_factor = &dpi_factor_mt8195_dpi,
> +       .num_dpi_factor = 1,
> +       .max_clock_khz = 594000,
> +       .output_fmts = mt8183_output_fmts,
> +       .num_output_fmts = ARRAY_SIZE(mt8183_output_fmts),
> +       .pixels_per_iter = 1,
> +       .is_ck_de_pol = true,
> +       .swap_input_support = true,
> +       .support_direct_pin = true,
> +       .dimension_mask = HPW_MASK,
> +       .hvsize_mask = HSIZE_MASK,
> +       .channel_swap_shift = CH_SWAP,
> +       .yuv422_en_bit = YUV422_EN,
> +       .csc_enable_bit = CSC_ENABLE,
> +       .is_internal_hdmi = true,
> +       .input_2pixel = true,
> +};
> +
>  static const struct mtk_dpi_conf mt8195_dpintf_conf = {
>         .dpi_factor = dpi_factor_mt8195_dp_intf,
>         .num_dpi_factor = ARRAY_SIZE(dpi_factor_mt8195_dp_intf),
> @@ -1216,6 +1260,7 @@ static const struct of_device_id mtk_dpi_of_ids[] = {
>         { .compatible = "mediatek,mt8188-dp-intf", .data = &mt8195_dpintf_conf },
>         { .compatible = "mediatek,mt8192-dpi", .data = &mt8192_conf },
>         { .compatible = "mediatek,mt8195-dp-intf", .data = &mt8195_dpintf_conf },
> +       { .compatible = "mediatek,mt8195-dpi", .data = &mt8195_conf },
>         { /* sentinel */ },
>  };
>  MODULE_DEVICE_TABLE(of, mtk_dpi_of_ids);
> diff --git a/drivers/gpu/drm/mediatek/mtk_dpi_regs.h b/drivers/gpu/drm/mediatek/mtk_dpi_regs.h
> index a0b1d18bbbf7..3c24d9e9f241 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dpi_regs.h
> +++ b/drivers/gpu/drm/mediatek/mtk_dpi_regs.h
> @@ -40,6 +40,12 @@
>  #define FAKE_DE_LEVEN                  BIT(21)
>  #define FAKE_DE_RODD                   BIT(22)
>  #define FAKE_DE_REVEN                  BIT(23)
> +
> +/* DPI_CON: DPI instances */
> +#define DPI_OUTPUT_1T1P_EN             BIT(24)
> +#define DPI_INPUT_2P_EN                        BIT(25)
> +
> +/* DPI_CON: DPINTF instances */
>  #define DPINTF_YUV422_EN               BIT(24)
>  #define DPINTF_CSC_ENABLE              BIT(26)
>  #define DPINTF_INPUT_2P_EN             BIT(29)
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> index 9a8ef8558da9..ba4539150f52 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> @@ -807,6 +807,8 @@ static const struct of_device_id mtk_ddp_comp_dt_ids[] = {
>           .data = (void *)MTK_DPI },
>         { .compatible = "mediatek,mt8195-dp-intf",
>           .data = (void *)MTK_DP_INTF },
> +       { .compatible = "mediatek,mt8195-dpi",
> +         .data = (void *)MTK_DPI },
>         { .compatible = "mediatek,mt2701-dsi",
>           .data = (void *)MTK_DSI },
>         { .compatible = "mediatek,mt8173-dsi",
> --
> 2.47.0
>