linux-kernel - Re: [PATCH v3 38/38] drm/msm/dp: Add MST stream support for SA8775P DP controller 0 and 1

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Message-ID: <fdwrpaa6cp47i2hvlccjwbzzr4vnhfispuyodollr4fn5oncwl@urt5vaowuz6x>
Date: Wed, 27 Aug 2025 04:19:10 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Yongxing Mou <yongxing.mou@....qualcomm.com>
Cc: Rob Clark <robin.clark@....qualcomm.com>,
        Dmitry Baryshkov <lumag@...nel.org>,
        Abhinav Kumar <abhinav.kumar@...ux.dev>,
        Jessica Zhang <jessica.zhang@....qualcomm.com>,
        Sean Paul <sean@...rly.run>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
        linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 38/38] drm/msm/dp: Add MST stream support for SA8775P
 DP controller 0 and 1

On Mon, Aug 25, 2025 at 10:16:24PM +0800, Yongxing Mou wrote:
> This change enables SA8775P support for Multi-Stream Transport (MST),
> allowing each controller to handle up to two or four DisplayPort streams.
> As all necessary code for MST support was already implemented in the
> previous series of patches.

Why do you update only SA8775P? Please update all the platforms at once.

> 
> Signed-off-by: Yongxing Mou <yongxing.mou@....qualcomm.com>
> ---
>  drivers/gpu/drm/msm/dp/dp_display.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
> index 897ef653b3cea08904bb3595e8ac10fd7fcf811f..4a94f37513c21f9a273080b572a1e50a186a45ce 100644
> --- a/drivers/gpu/drm/msm/dp/dp_display.c
> +++ b/drivers/gpu/drm/msm/dp/dp_display.c
> @@ -108,8 +108,10 @@ struct msm_dp_desc {
>  };
>  
>  static const struct msm_dp_desc msm_dp_desc_sa8775p[] = {
> -	{ .io_start = 0x0af54000, .id = MSM_DP_CONTROLLER_0, .wide_bus_supported = true },
> -	{ .io_start = 0x0af5c000, .id = MSM_DP_CONTROLLER_1, .wide_bus_supported = true },
> +	{ .io_start = 0x0af54000, .id = MSM_DP_CONTROLLER_0, .wide_bus_supported = true,
> +	  .mst_streams = 4},
> +	{ .io_start = 0x0af5c000, .id = MSM_DP_CONTROLLER_1, .wide_bus_supported = true,
> +	  .mst_streams = 2},
>  	{ .io_start = 0x22154000, .id = MSM_DP_CONTROLLER_2, .wide_bus_supported = true },
>  	{ .io_start = 0x2215c000, .id = MSM_DP_CONTROLLER_3, .wide_bus_supported = true },
>  	{}
> 
> -- 
> 2.34.1
> 

-- 
With best wishes
Dmitry