linux-kernel - Re: [Freedreno] [PATCH v3 2/5] drm/msm/dp: Modify prototype of encoder based API

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Date:   Tue, 05 Oct 2021 13:13:08 -0700
From:   abhinavk@...eaurora.org
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Kalyan Thota <kalyan_t@...eaurora.org>,
        Kuogee Hsieh <khsieh@...eaurora.org>,
        Rob Herring <robh+dt@...nel.org>,
        Stephen Boyd <swboyd@...omium.org>,
        linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [Freedreno] [PATCH v3 2/5] drm/msm/dp: Modify prototype of
 encoder based API

On 2021-10-01 11:00, Bjorn Andersson wrote:
> Functions in the DisplayPort code that relates to individual instances
> (encoders) are passed both the struct msm_dp and the struct 
> drm_encoder. But
> in a situation where multiple DP instances would exist this means that
> the caller need to resolve which struct msm_dp relates to the struct
> drm_encoder at hand.
> 
> Store a reference to the struct msm_dp associated with each
> dpu_encoder_virt to allow the particular instance to be associate with
> the encoder in the following patch.
> 
> Reviewed-by: Stephen Boyd <swboyd@...omium.org>
> Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
Reviewed-by: Abhinav Kumar <abhinavk@...eaurora.org>
> ---
> 
> Changes since v2:
> - None
> 
>  drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 23 ++++++++++++---------
>  1 file changed, 13 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> index 0e9d3fa1544b..b7f33da2799c 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> @@ -168,6 +168,7 @@ enum dpu_enc_rc_states {
>   * @vsync_event_work:		worker to handle vsync event for autorefresh
>   * @topology:                   topology of the display
>   * @idle_timeout:		idle timeout duration in milliseconds
> + * @dp:				msm_dp pointer, for DP encoders
>   */
>  struct dpu_encoder_virt {
>  	struct drm_encoder base;
> @@ -206,6 +207,8 @@ struct dpu_encoder_virt {
>  	struct msm_display_topology topology;
> 
>  	u32 idle_timeout;
> +
> +	struct msm_dp *dp;
>  };
> 
>  #define to_dpu_encoder_virt(x) container_of(x, struct 
> dpu_encoder_virt, base)
> @@ -1000,8 +1003,8 @@ static void dpu_encoder_virt_mode_set(struct
> drm_encoder *drm_enc,
> 
>  	trace_dpu_enc_mode_set(DRMID(drm_enc));
> 
> -	if (drm_enc->encoder_type == DRM_MODE_ENCODER_TMDS && priv->dp)
> -		msm_dp_display_mode_set(priv->dp, drm_enc, mode, adj_mode);
> +	if (drm_enc->encoder_type == DRM_MODE_ENCODER_TMDS)
> +		msm_dp_display_mode_set(dpu_enc->dp, drm_enc, mode, adj_mode);
> 
>  	list_for_each_entry(conn_iter, connector_list, head)
>  		if (conn_iter->encoder == drm_enc)
> @@ -1182,9 +1185,8 @@ static void dpu_encoder_virt_enable(struct
> drm_encoder *drm_enc)
> 
>  	_dpu_encoder_virt_enable_helper(drm_enc);
> 
> -	if (drm_enc->encoder_type == DRM_MODE_ENCODER_TMDS && priv->dp) {
> -		ret = msm_dp_display_enable(priv->dp,
> -						drm_enc);
> +	if (drm_enc->encoder_type == DRM_MODE_ENCODER_TMDS) {
> +		ret = msm_dp_display_enable(dpu_enc->dp, drm_enc);
>  		if (ret) {
>  			DPU_ERROR_ENC(dpu_enc, "dp display enable failed: %d\n",
>  				ret);
> @@ -1224,8 +1226,8 @@ static void dpu_encoder_virt_disable(struct
> drm_encoder *drm_enc)
>  	/* wait for idle */
>  	dpu_encoder_wait_for_event(drm_enc, MSM_ENC_TX_COMPLETE);
> 
> -	if (drm_enc->encoder_type == DRM_MODE_ENCODER_TMDS && priv->dp) {
> -		if (msm_dp_display_pre_disable(priv->dp, drm_enc))
> +	if (drm_enc->encoder_type == DRM_MODE_ENCODER_TMDS) {
> +		if (msm_dp_display_pre_disable(dpu_enc->dp, drm_enc))
>  			DPU_ERROR_ENC(dpu_enc, "dp display push idle failed\n");
>  	}
> 
> @@ -1253,8 +1255,8 @@ static void dpu_encoder_virt_disable(struct
> drm_encoder *drm_enc)
> 
>  	DPU_DEBUG_ENC(dpu_enc, "encoder disabled\n");
> 
> -	if (drm_enc->encoder_type == DRM_MODE_ENCODER_TMDS && priv->dp) {
> -		if (msm_dp_display_disable(priv->dp, drm_enc))
> +	if (drm_enc->encoder_type == DRM_MODE_ENCODER_TMDS) {
> +		if (msm_dp_display_disable(dpu_enc->dp, drm_enc))
>  			DPU_ERROR_ENC(dpu_enc, "dp display disable failed\n");
>  	}
> 
> @@ -2170,7 +2172,8 @@ int dpu_encoder_setup(struct drm_device *dev,
> struct drm_encoder *enc,
>  		timer_setup(&dpu_enc->vsync_event_timer,
>  				dpu_encoder_vsync_event_handler,
>  				0);
> -
> +	else if (disp_info->intf_type == DRM_MODE_ENCODER_TMDS)
> +		dpu_enc->dp = priv->dp;
> 
>  	INIT_DELAYED_WORK(&dpu_enc->delayed_off_work,
>  			dpu_encoder_off_work);