linux-kernel - Re: [PATCH v3 35/38] drm/msm/dp: initialize dp

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <yztpuhehjydmtefynpa7gt2keysdjpsdmrke6nkjsv7jnhkvkq@cve5yzs7v2sx>
Date: Wed, 27 Aug 2025 00:27:18 +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,
        Abhinav Kumar <quic_abhinavk@...cinc.com>
Subject: Re: [PATCH v3 35/38] drm/msm/dp: initialize dp_mst module for each
 DP MST controller

On Mon, Aug 25, 2025 at 10:16:21PM +0800, Yongxing Mou wrote:
> From: Abhinav Kumar <quic_abhinavk@...cinc.com>
> 
> For each MST capable DP controller, initialize a dp_mst module to
> manage its DP MST operations. The DP MST module for each controller
> is the central entity to manage its topology related operations as
> well as interfacing with the rest of the DP driver.
> 
> Signed-off-by: Abhinav Kumar <quic_abhinavk@...cinc.com>
> Signed-off-by: Yongxing Mou <yongxing.mou@....qualcomm.com>
> ---
>  drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c | 6 ++++++
>  drivers/gpu/drm/msm/dp/dp_display.c     | 9 +++++++++
>  drivers/gpu/drm/msm/msm_drv.h           | 6 ++++++
>  3 files changed, 21 insertions(+)
> 
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
> index 0b9d9207f4f69e0d0725ff265c624828b5816a8b..4036d3445946930e635401109ac4720ed2282c2f 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
> @@ -681,6 +681,12 @@ static int _dpu_kms_initialize_displayport(struct drm_device *dev,
>  		stream_cnt = msm_dp_get_mst_max_stream(priv->kms->dp[i]);
>  
>  		if (stream_cnt > 1) {
> +			rc = msm_dp_mst_register(priv->kms->dp[i]);
> +			if (rc) {
> +				DPU_ERROR("dp_mst_init failed for DP, rc = %d\n", rc);
> +				return rc;
> +			}
> +
>  			for (stream_id = 0; stream_id < stream_cnt; stream_id++) {
>  				info.stream_id = stream_id;
>  				encoder = dpu_encoder_init(dev, DRM_MODE_ENCODER_DPMST, &info);
> diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
> index 909c84a5c97f56138d0d62c5d856d2fd18d36b8c..897ef653b3cea08904bb3595e8ac10fd7fcf811f 100644
> --- a/drivers/gpu/drm/msm/dp/dp_display.c
> +++ b/drivers/gpu/drm/msm/dp/dp_display.c
> @@ -1586,6 +1586,15 @@ int msm_dp_modeset_init(struct msm_dp *msm_dp_display, struct drm_device *dev,
>  	return 0;
>  }
>  
> +inline int msm_dp_mst_register(struct msm_dp *msm_dp_display)

Why is it inline? Also please move this to a corresponding patch (the
one which adds msm_dp_mst_init).

> +{
> +	struct msm_dp_display_private *dp;
> +
> +	dp = container_of(msm_dp_display, struct msm_dp_display_private, msm_dp_display);
> +
> +	return msm_dp_mst_init(msm_dp_display, dp->max_stream, dp->aux);
> +}
> +
>  void msm_dp_display_atomic_prepare(struct msm_dp *msm_dp_display)
>  {
>  	int rc = 0;
> diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h
> index 3e64ec7b7dbe1d1107e85def9aa80277131f40bf..c46c88cf06598df996a17c23631570fda078b371 100644
> --- a/drivers/gpu/drm/msm/msm_drv.h
> +++ b/drivers/gpu/drm/msm/msm_drv.h
> @@ -365,6 +365,7 @@ bool msm_dp_wide_bus_available(const struct msm_dp *dp_display);
>  
>  int msm_dp_get_mst_max_stream(struct msm_dp *dp_display);
>  int msm_dp_mst_drm_bridge_init(struct msm_dp *dp_display, struct drm_encoder *encoder);
> +int msm_dp_mst_register(struct msm_dp *dp_display);
>  
>  #else
>  static inline int __init msm_dp_register(void)
> @@ -392,6 +393,11 @@ static inline int msm_dp_mst_drm_bridge_init(struct msm_dp *dp_display, struct d
>  	return -EINVAL;
>  }
>  
> +static inline int msm_dp_mst_register(struct msm_dp *dp_display)
> +{
> +	return -EINVAL;
> +}
> +
>  static inline void msm_dp_snapshot(struct msm_disp_state *disp_state, struct msm_dp *dp_display)
>  {
>  }
> 
> -- 
> 2.34.1
> 

-- 
With best wishes
Dmitry