[PATCH 3/3] drm/panel: Enable DSC for Visionox VTDR6130 panel

[Dmitry Baryshkov]

On Thu, 28 Mar 2024 at 13:12, Jun Nie <jun.nie at linaro.org> wrote:
>
> Enable display compression (DSC v1.2) for 1080x2400 Visionox
> VTDR6130 AMOLED DSI panel. DTS property is needed to enable DSC.
> Default configuration is video mode + non-DSC for any back
> compatibility.

The changelog talks about the DSC only, while the changes also include
the CMD mode support. This should be split to a separate patch.

>
> Below modes works on SM8650. While cmd mode does not work yet.
> - video mode + DSC
> - video mode
> - cmd mode + DSC
>
> Signed-off-by: Jun Nie <jun.nie at linaro.org>
> ---
>  .../gpu/drm/panel/panel-visionox-vtdr6130.c   | 58 ++++++++++++++++++-
>  1 file changed, 57 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/panel/panel-visionox-vtdr6130.c b/drivers/gpu/drm/panel/panel-visionox-vtdr6130.c
> index 540099253e1b..d6c44816cdd0 100644
> --- a/drivers/gpu/drm/panel/panel-visionox-vtdr6130.c
> +++ b/drivers/gpu/drm/panel/panel-visionox-vtdr6130.c
> @@ -9,6 +9,7 @@
>  #include <linux/of.h>
>
>  #include <drm/display/drm_dsc.h>
> +#include <drm/display/drm_dsc_helper.h>
>  #include <drm/drm_mipi_dsi.h>
>  #include <drm/drm_modes.h>
>  #include <drm/drm_panel.h>
> @@ -17,9 +18,12 @@
>
>  struct visionox_vtdr6130 {
>         struct drm_panel panel;
> +       struct drm_dsc_config dsc;
>         struct mipi_dsi_device *dsi;
>         struct gpio_desc *reset_gpio;
>         struct regulator_bulk_data supplies[3];
> +       bool cmd_mode;
> +       bool dsc_enable;
>  };
>
>  static inline struct visionox_vtdr6130 *to_visionox_vtdr6130(struct drm_panel *panel)
> @@ -49,12 +53,20 @@ static int visionox_vtdr6130_on(struct visionox_vtdr6130 *ctx)
>         if (ret)
>                 return ret;
>
> +       if (ctx->dsc_enable)
> +               mipi_dsi_dcs_write_seq(dsi, 0x03, 0x01);

It it really MIPI_DCS_GET_COMPRESSION_MODE?
> +
>         mipi_dsi_dcs_write_seq(dsi, MIPI_DCS_WRITE_CONTROL_DISPLAY, 0x20);
>         mipi_dsi_dcs_write_seq(dsi, MIPI_DCS_SET_DISPLAY_BRIGHTNESS, 0x00, 0x00);
>         mipi_dsi_dcs_write_seq(dsi, 0x59, 0x09);
>         mipi_dsi_dcs_write_seq(dsi, 0x6c, 0x01);
>         mipi_dsi_dcs_write_seq(dsi, 0x6d, 0x00);
> -       mipi_dsi_dcs_write_seq(dsi, 0x6f, 0x01);
> +
> +       if (ctx->cmd_mode)
> +               mipi_dsi_dcs_write_seq(dsi, 0x6f, 0x02);
> +       else
> +               mipi_dsi_dcs_write_seq(dsi, 0x6f, 0x01);
> +
>         mipi_dsi_dcs_write_seq(dsi, 0x70,
>                                0x12, 0x00, 0x00, 0xab, 0x30, 0x80, 0x09, 0x60, 0x04,
>                                0x38, 0x00, 0x28, 0x02, 0x1c, 0x02, 0x1c, 0x02, 0x00,
> @@ -205,6 +217,26 @@ static const struct drm_display_mode visionox_vtdr6130_mode = {
>         .height_mm = 157,
>  };
>
> +static int visionox_vtdr6130_enable(struct drm_panel *panel)
> +{
> +       struct visionox_vtdr6130 *ctx = to_visionox_vtdr6130(panel);
> +       struct mipi_dsi_device *dsi = ctx->dsi;
> +       struct drm_dsc_picture_parameter_set pps;
> +       int ret;
> +
> +       if (!dsi->dsc)
> +               return 0;
> +
> +       drm_dsc_pps_payload_pack(&pps, dsi->dsc);
> +       ret = mipi_dsi_picture_parameter_set(dsi, &pps);
> +       if (ret) {
> +               dev_err(&dsi->dev, "Failed to set PPS\n");
> +               return ret;
> +       }
> +
> +       return 0;
> +}
> +
>  static int visionox_vtdr6130_get_modes(struct drm_panel *panel,
>                                        struct drm_connector *connector)
>  {
> @@ -228,6 +260,7 @@ static const struct drm_panel_funcs visionox_vtdr6130_panel_funcs = {
>         .prepare = visionox_vtdr6130_prepare,
>         .unprepare = visionox_vtdr6130_unprepare,
>         .get_modes = visionox_vtdr6130_get_modes,
> +       .enable = visionox_vtdr6130_enable,
>  };
>
>  static int visionox_vtdr6130_bl_update_status(struct backlight_device *bl)
> @@ -260,12 +293,32 @@ static int visionox_vtdr6130_probe(struct mipi_dsi_device *dsi)
>  {
>         struct device *dev = &dsi->dev;
>         struct visionox_vtdr6130 *ctx;
> +       struct drm_dsc_config *dsc;
>         int ret;
>
>         ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
>         if (!ctx)
>                 return -ENOMEM;
>
> +       ctx->cmd_mode = of_property_read_bool(dev->of_node, "enforce-cmd-mode");
> +       ctx->dsc_enable = of_property_read_bool(dev->of_node, "enable-dsc");
> +
> +       /* Set DSC params */
> +       if (ctx->dsc_enable) {
> +               dsc = &ctx->dsc;
> +               dsc->dsc_version_major = 0x1;
> +               dsc->dsc_version_minor = 0x2;
> +               dsc->slice_height = 40;
> +               dsc->slice_width = 540;
> +               dsc->slice_count = 2;
> +               dsc->slice_per_pkt = 1;
> +               dsc->bits_per_component = 8;
> +               dsc->bits_per_pixel = 8 << 4;
> +               dsc->block_pred_enable = true;
> +
> +               dsi->dsc = dsc;
> +       }
> +
>         ctx->supplies[0].supply = "vddio";
>         ctx->supplies[1].supply = "vci";
>         ctx->supplies[2].supply = "vdd";
> @@ -306,6 +359,9 @@ static int visionox_vtdr6130_probe(struct mipi_dsi_device *dsi)
>                 return ret;
>         }
>
> +       dev_err(&dsi->dev, "discovered with %s mode %s\n",
> +               ctx->cmd_mode ? "cmd" : "video",
> +               ctx->dsc_enable ? "and DSC enabled" : "");
>         return 0;
>  }
>
> --
> 2.34.1
>


-- 
With best wishes
Dmitry