linux-kernel - Re: [PATCH v3,2/3] drm/mediatek: dsi: Add dsi cmdq

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Message-ID: <14e03873-3723-8293-0190-445a71828b25@collabora.com>
Date:   Mon, 11 Sep 2023 13:03:25 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Shuijing Li <shuijing.li@...iatek.com>, chunkuang.hu@...nel.org,
        p.zabel@...gutronix.de, airlied@...il.com, daniel@...ll.ch,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        conor+dt@...nel.org, matthias.bgg@...il.com, jitao.shi@...iatek.com
Cc:     dri-devel@...ts.freedesktop.org,
        linux-mediatek@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Project_Global_Chrome_Upstream_Group@...iatek.com
Subject: Re: [PATCH v3,2/3] drm/mediatek: dsi: Add dsi cmdq_ctl to send panel
 initial code

Il 11/09/23 12:57, Shuijing Li ha scritto:
> For mt8188, add dsi cmdq reg control to send long packets to panel
> initialization. MT8188 hardware has been changed to automatically
> set the cmdq_size value by default when sending long packets.
> In this patch, the cmdq_size value is set manually instead.
> Remain consistent with previous IC.
> 
> Signed-off-by: Shuijing Li <shuijing.li@...iatek.com>
> ---
> Changes in v3:
> reorder patch 2/3 and 3/3, and describe more about why mt8188 need this
> patch,
> per suggestion from the previous thread:
> https://lore.kernel.org/lkml/411ddbf95e2c2298b84899065691d478069ec273.camel@mediatek.com/
> Changes in v2:
> use mtk_dsi_mask(dsi, DSI_CMDQ_SIZE, CMDQ_SIZE_SEL, CMDQ_SIZE_SEL); directly,
> per suggestion from the previous thread:
> https://lore.kernel.org/lkml/015f4c60-ed77-9e1f-8a6b-cda6e4f6ac93@gmail.com/
> ---
>   drivers/gpu/drm/mediatek/mtk_dsi.c | 4 ++++
>   1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
> index d8bfc2cce54d..e83705394ada 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dsi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
> @@ -86,6 +86,7 @@
>   
>   #define DSI_CMDQ_SIZE		0x60
>   #define CMDQ_SIZE			0x3f
> +#define CMDQ_SIZE_SEL		BIT(15)
>   
>   #define DSI_HSTX_CKL_WC		0x64
>   
> @@ -178,6 +179,7 @@ struct mtk_dsi_driver_data {
>   	const u32 reg_cmdq_off;
>   	bool has_shadow_ctl;
>   	bool has_size_ctl;
> +	bool cmdq_long_packet_ctl;
>   };
>   
>   struct mtk_dsi {
> @@ -996,6 +998,8 @@ static void mtk_dsi_cmdq(struct mtk_dsi *dsi, const struct mipi_dsi_msg *msg)
>   
>   	mtk_dsi_mask(dsi, reg_cmdq_off, cmdq_mask, reg_val);
>   	mtk_dsi_mask(dsi, DSI_CMDQ_SIZE, CMDQ_SIZE, cmdq_size);
> +	if (dsi->driver_data->cmdq_long_packet_ctl)

Please add a comment here, like:

		/* Disable setting cmdq_size automatically for long packets */

after which
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>

> +		mtk_dsi_mask(dsi, DSI_CMDQ_SIZE, CMDQ_SIZE_SEL, CMDQ_SIZE_SEL);
>   }
>   
>   static ssize_t mtk_dsi_host_send_cmd(struct mtk_dsi *dsi,