diff mbox series

drm/mediatek: fine tune the data lane trail by project dts

Message ID 20210201034755.15793-1-jitao.shi@mediatek.com (mailing list archive)
State New
Headers show
Series drm/mediatek: fine tune the data lane trail by project dts | expand

Commit Message

Jitao Shi Feb. 1, 2021, 3:47 a.m. UTC
Some panels or bridges require customized hs_da_trail time.
So add a property in devicetree for this panels and bridges.

Signed-off-by: Jitao Shi <jitao.shi@mediatek.com>
---
 drivers/gpu/drm/mediatek/mtk_dsi.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

Comments

Nicolas Boichat Feb. 3, 2021, 4:02 a.m. UTC | #1
On Mon, Feb 1, 2021 at 11:48 AM Jitao Shi <jitao.shi@mediatek.com> wrote:
>
> Some panels or bridges require customized hs_da_trail time.
> So add a property in devicetree for this panels and bridges.

Since this changes the device tree, you also need to upload a binding
document change.

>
> Signed-off-by: Jitao Shi <jitao.shi@mediatek.com>
> ---
>  drivers/gpu/drm/mediatek/mtk_dsi.c | 10 +++++++++-
>  1 file changed, 9 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
> index 8c70ec39bfe1..6e7092fa2fee 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dsi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
> @@ -194,6 +194,7 @@ struct mtk_dsi {
>         struct clk *hs_clk;
>
>         u32 data_rate;
> +       u32 da_trail_delta;
>
>         unsigned long mode_flags;
>         enum mipi_dsi_pixel_format format;
> @@ -234,7 +235,7 @@ static void mtk_dsi_phy_timconfig(struct mtk_dsi *dsi)
>         timing->da_hs_prepare = (80 * data_rate_mhz + 4 * 1000) / 8000;
>         timing->da_hs_zero = (170 * data_rate_mhz + 10 * 1000) / 8000 + 1 -
>                              timing->da_hs_prepare;
> -       timing->da_hs_trail = timing->da_hs_prepare + 1;
> +       timing->da_hs_trail = timing->da_hs_prepare + 1 + dsi->da_trail_delta;
>
>         timing->ta_go = 4 * timing->lpx - 2;
>         timing->ta_sure = timing->lpx + 2;
> @@ -1094,6 +1095,13 @@ static int mtk_dsi_probe(struct platform_device *pdev)
>                 goto err_unregister_host;
>         }
>
> +       ret = of_property_read_u32_index(dev->of_node, "da_trail_delta", 0,
> +                                        &dsi->da_trail_delta);
> +       if (ret) {
> +               dev_info(dev, "Can't get da_trail_delta, keep it as 0: %d\n", ret);
> +               dsi->da_trail_delta = 0;
> +       }
> +
>         comp_id = mtk_ddp_comp_get_id(dev->of_node, MTK_DSI);
>         if (comp_id < 0) {
>                 dev_err(dev, "Failed to identify by alias: %d\n", comp_id);
> --
> 2.12.5
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel
Chun-Kuang Hu March 18, 2021, 12:31 a.m. UTC | #2
Hi, Jitao:

Jitao Shi <jitao.shi@mediatek.com> 於 2021年2月1日 週一 上午11:48寫道:
>
> Some panels or bridges require customized hs_da_trail time.
> So add a property in devicetree for this panels and bridges.
>
> Signed-off-by: Jitao Shi <jitao.shi@mediatek.com>
> ---
>  drivers/gpu/drm/mediatek/mtk_dsi.c | 10 +++++++++-
>  1 file changed, 9 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
> index 8c70ec39bfe1..6e7092fa2fee 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dsi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
> @@ -194,6 +194,7 @@ struct mtk_dsi {
>         struct clk *hs_clk;
>
>         u32 data_rate;
> +       u32 da_trail_delta;
>
>         unsigned long mode_flags;
>         enum mipi_dsi_pixel_format format;
> @@ -234,7 +235,7 @@ static void mtk_dsi_phy_timconfig(struct mtk_dsi *dsi)
>         timing->da_hs_prepare = (80 * data_rate_mhz + 4 * 1000) / 8000;
>         timing->da_hs_zero = (170 * data_rate_mhz + 10 * 1000) / 8000 + 1 -
>                              timing->da_hs_prepare;
> -       timing->da_hs_trail = timing->da_hs_prepare + 1;
> +       timing->da_hs_trail = timing->da_hs_prepare + 1 + dsi->da_trail_delta;
>
>         timing->ta_go = 4 * timing->lpx - 2;
>         timing->ta_sure = timing->lpx + 2;
> @@ -1094,6 +1095,13 @@ static int mtk_dsi_probe(struct platform_device *pdev)
>                 goto err_unregister_host;
>         }
>
> +       ret = of_property_read_u32_index(dev->of_node, "da_trail_delta", 0,
> +                                        &dsi->da_trail_delta);

This value depends on panel, so I think we should get some value from
panel's device node to calculate this value.

Regards,
Chun-Kuang.

> +       if (ret) {
> +               dev_info(dev, "Can't get da_trail_delta, keep it as 0: %d\n", ret);
> +               dsi->da_trail_delta = 0;
> +       }
> +
>         comp_id = mtk_ddp_comp_get_id(dev->of_node, MTK_DSI);
>         if (comp_id < 0) {
>                 dev_err(dev, "Failed to identify by alias: %d\n", comp_id);
> --
> 2.12.5
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel
diff mbox series

Patch

diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
index 8c70ec39bfe1..6e7092fa2fee 100644
--- a/drivers/gpu/drm/mediatek/mtk_dsi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
@@ -194,6 +194,7 @@  struct mtk_dsi {
 	struct clk *hs_clk;
 
 	u32 data_rate;
+	u32 da_trail_delta;
 
 	unsigned long mode_flags;
 	enum mipi_dsi_pixel_format format;
@@ -234,7 +235,7 @@  static void mtk_dsi_phy_timconfig(struct mtk_dsi *dsi)
 	timing->da_hs_prepare = (80 * data_rate_mhz + 4 * 1000) / 8000;
 	timing->da_hs_zero = (170 * data_rate_mhz + 10 * 1000) / 8000 + 1 -
 			     timing->da_hs_prepare;
-	timing->da_hs_trail = timing->da_hs_prepare + 1;
+	timing->da_hs_trail = timing->da_hs_prepare + 1 + dsi->da_trail_delta;
 
 	timing->ta_go = 4 * timing->lpx - 2;
 	timing->ta_sure = timing->lpx + 2;
@@ -1094,6 +1095,13 @@  static int mtk_dsi_probe(struct platform_device *pdev)
 		goto err_unregister_host;
 	}
 
+	ret = of_property_read_u32_index(dev->of_node, "da_trail_delta", 0,
+					 &dsi->da_trail_delta);
+	if (ret) {
+		dev_info(dev, "Can't get da_trail_delta, keep it as 0: %d\n", ret);
+		dsi->da_trail_delta = 0;
+	}
+
 	comp_id = mtk_ddp_comp_get_id(dev->of_node, MTK_DSI);
 	if (comp_id < 0) {
 		dev_err(dev, "Failed to identify by alias: %d\n", comp_id);