linux-kernel - Re: [PATCH v2 38/38] drm/msm/dp: Add MST stream support for SA8775P DP controller 0 and 1

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Message-ID: <xx6v4lfd5cv24ce2kqtt7kverk36snydypeaq7h2hgjti5iadq@japcugke524t>
Date: Mon, 9 Jun 2025 17:47:47 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Yongxing Mou <quic_yongmou@...cinc.com>
Cc: Rob Clark <robin.clark@....qualcomm.com>,
        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 v2 38/38] drm/msm/dp: Add MST stream support for SA8775P
 DP controller 0 and 1

On Mon, Jun 09, 2025 at 08:21:57PM +0800, Yongxing Mou wrote:
> This change enables support for Multi-Stream Transport (MST), allowing
> each controller to handle up to two DisplayPort streams. As all
> necessary code for MST support was already implemented in the previous
> series of patches.
> 
> Signed-off-by: Yongxing Mou <quic_yongmou@...cinc.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 75f2fd7c75eae81e5c843f8ae2d1ce12ad0cad7e..16196dcc9ff4ac6a35b6bcd8d433b08f7d18fe5b 100644
> --- a/drivers/gpu/drm/msm/dp/dp_display.c
> +++ b/drivers/gpu/drm/msm/dp/dp_display.c
> @@ -127,8 +127,10 @@ 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 = 2},

I thought few patches ago you wrote that this controller should support
4 MST streams.

> +	{ .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