Re: [PATCH 2/3] drm/mediatek: CMDQ reg address of mt8173 is different with mt2701

[Nicolas Boichat]

On Thu, Feb 14, 2019 at 12:42 PM Jitao Shi <jitao.shi@xxxxxxxxxxxx> wrote:
>
> Config the different CMDQ reg address in driver data.
>
> Signed-off-by: Jitao Shi <jitao.shi@xxxxxxxxxxxx>
> ---
>  drivers/gpu/drm/mediatek/mtk_dsi.c | 39 ++++++++++++++++++++++++------
>  1 file changed, 31 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
> index 93fa255b4aad..80db02a25cb0 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dsi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
> @@ -156,6 +156,10 @@
>
>  struct phy;
>
> +struct mtk_dsi_driver_data {
> +       const u32 reg_cmdq_off;
> +};
> +
>  struct mtk_dsi {
>         struct mtk_ddp_comp ddp_comp;
>         struct device *dev;
> @@ -182,6 +186,7 @@ struct mtk_dsi {
>         bool enabled;
>         u32 irq_data;
>         wait_queue_head_t irq_wait_queue;
> +       struct mtk_dsi_driver_data *driver_data;
>  };
>
>  static inline struct mtk_dsi *encoder_to_dsi(struct drm_encoder *e)
> @@ -934,6 +939,7 @@ static void mtk_dsi_cmdq(struct mtk_dsi *dsi, const struct mipi_dsi_msg *msg)
>         const char *tx_buf = msg->tx_buf;
>         u8 config, cmdq_size, cmdq_off, type = msg->type;
>         u32 reg_val, cmdq_mask, i;
> +       u32 reg_cmdq_off = dsi->driver_data->reg_cmdq_off;
>
>         if (MTK_DSI_HOST_IS_READ(type))
>                 config = BTA;
> @@ -953,9 +959,11 @@ static void mtk_dsi_cmdq(struct mtk_dsi *dsi, const struct mipi_dsi_msg *msg)
>         }
>
>         for (i = 0; i < msg->tx_len; i++)
> -               writeb(tx_buf[i], dsi->regs + DSI_CMDQ0 + cmdq_off + i);
> +               mtk_dsi_mask(dsi, (reg_cmdq_off + cmdq_off + i) & (~0x3U),
> +                            (0xffUL << (((i + cmdq_off) & 3U) * 8U)),
> +                            tx_buf[i] << (((i + cmdq_off) & 3U) * 8U));

I found the writeb call _much_ clearer ... Either switch back to that,
or create a new mtk_disk_mask_byte function maybe?

>
> -       mtk_dsi_mask(dsi, DSI_CMDQ0, cmdq_mask, reg_val);
> +       mtk_dsi_mask(dsi, reg_cmdq_off, cmdq_mask, reg_val);

You're removing DSI_CMDQ0 usage in this patch, so remove the #define
in this patch too (instead of doing that in 3/3).

>         mtk_dsi_mask(dsi, DSI_CMDQ_SIZE, CMDQ_SIZE, cmdq_size);
>  }
>
> @@ -1074,10 +1082,27 @@ static const struct component_ops mtk_dsi_component_ops = {
>         .unbind = mtk_dsi_unbind,
>  };
>
> +static const struct mtk_dsi_driver_data mt8173_dsi_driver_data = {
> +       .reg_cmdq_off = 0x200,
> +};
> +
> +static const struct mtk_dsi_driver_data mt2701_dsi_driver_data = {
> +       .reg_cmdq_off = 0x180,
> +};
> +
> +static const struct of_device_id mtk_dsi_of_match[] = {
> +       { .compatible = "mediatek,mt2701-dsi",
> +         .data = &mt2701_dsi_driver_data },
> +       { .compatible = "mediatek,mt8173-dsi",
> +         .data = &mt8173_dsi_driver_data },
> +       { },
> +};
> +
>  static int mtk_dsi_probe(struct platform_device *pdev)
>  {
>         struct mtk_dsi *dsi;
>         struct device *dev = &pdev->dev;
> +       const struct of_device_id *of_id;
>         struct resource *regs;
>         int irq_num;
>         int comp_id;
> @@ -1101,6 +1126,10 @@ static int mtk_dsi_probe(struct platform_device *pdev)
>         if (ret)
>                 goto err_unregister_host;
>
> +       of_id = of_match_device(mtk_dsi_of_match, &pdev->dev);
> +       dsi->driver_data = (struct mtk_dsi_driver_data *)
> +                           of_id->data;

This fits in 80 chars. Also, of_id->data is a void*, so no cast needed.

> +
>         dsi->engine_clk = devm_clk_get(dev, "engine");
>         if (IS_ERR(dsi->engine_clk)) {
>                 ret = PTR_ERR(dsi->engine_clk);
> @@ -1194,12 +1223,6 @@ static int mtk_dsi_remove(struct platform_device *pdev)
>         return 0;
>  }
>
> -static const struct of_device_id mtk_dsi_of_match[] = {
> -       { .compatible = "mediatek,mt2701-dsi" },
> -       { .compatible = "mediatek,mt8173-dsi" },
> -       { },
> -};

Any reason you moved this up?

> -
>  struct platform_driver mtk_dsi_driver = {
>         .probe = mtk_dsi_probe,
>         .remove = mtk_dsi_remove,
> --
> 2.20.1
>