linux-kernel - Re: [PATCH v3 11/13] drm/msm/dsi: add mode valid callback for dsi

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Date:   Wed, 24 Nov 2021 23:33:32 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Vinod Koul <vkoul@...nel.org>, Rob Clark <robdclark@...il.com>
Cc:     linux-arm-msm@...r.kernel.org,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Jonathan Marek <jonathan@...ek.ca>,
        Abhinav Kumar <abhinavk@...eaurora.org>,
        Jeffrey Hugo <jeffrey.l.hugo@...il.com>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org
Subject: Re: [PATCH v3 11/13] drm/msm/dsi: add mode valid callback for dsi_mgr

On 16/11/2021 09:22, Vinod Koul wrote:
> Add a mode valid callback for dsi_mgr for checking mode being valid in
> case of DSC. For DSC the height and width needs to be multiple of slice,
> so we check that here
> 
> Signed-off-by: Vinod Koul <vkoul@...nel.org>

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>

> ---
>   drivers/gpu/drm/msm/dsi/dsi.h         |  2 ++
>   drivers/gpu/drm/msm/dsi/dsi_host.c    | 26 ++++++++++++++++++++++++++
>   drivers/gpu/drm/msm/dsi/dsi_manager.c | 12 ++++++++++++
>   3 files changed, 40 insertions(+)
> 
> diff --git a/drivers/gpu/drm/msm/dsi/dsi.h b/drivers/gpu/drm/msm/dsi/dsi.h
> index 569c8ff062ba..e7affab2fc1e 100644
> --- a/drivers/gpu/drm/msm/dsi/dsi.h
> +++ b/drivers/gpu/drm/msm/dsi/dsi.h
> @@ -115,6 +115,8 @@ int msm_dsi_host_power_on(struct mipi_dsi_host *host,
>   int msm_dsi_host_power_off(struct mipi_dsi_host *host);
>   int msm_dsi_host_set_display_mode(struct mipi_dsi_host *host,
>   				  const struct drm_display_mode *mode);
> +enum drm_mode_status msm_dsi_host_check_dsc(struct mipi_dsi_host *host,
> +					    const struct drm_display_mode *mode);
>   struct drm_panel *msm_dsi_host_get_panel(struct mipi_dsi_host *host);
>   unsigned long msm_dsi_host_get_mode_flags(struct mipi_dsi_host *host);
>   struct drm_bridge *msm_dsi_host_get_bridge(struct mipi_dsi_host *host);
> diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c
> index 30c1e299aa52..31d385d8d834 100644
> --- a/drivers/gpu/drm/msm/dsi/dsi_host.c
> +++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
> @@ -2588,6 +2588,32 @@ int msm_dsi_host_set_display_mode(struct mipi_dsi_host *host,
>   	return 0;
>   }
>   
> +enum drm_mode_status msm_dsi_host_check_dsc(struct mipi_dsi_host *host,
> +					    const struct drm_display_mode *mode)
> +{
> +	struct msm_dsi_host *msm_host = to_msm_dsi_host(host);
> +	struct msm_display_dsc_config *dsc = msm_host->dsc;
> +	int pic_width = mode->hdisplay;
> +	int pic_height = mode->vdisplay;
> +
> +	if (!msm_host->dsc)
> +		return MODE_OK;
> +
> +	if (pic_width % dsc->drm->slice_width) {
> +		pr_err("DSI: pic_width %d has to be multiple of slice %d\n",
> +		       pic_width, dsc->drm->slice_width);
> +		return MODE_H_ILLEGAL;
> +	}
> +
> +	if (pic_height % dsc->drm->slice_height) {
> +		pr_err("DSI: pic_height %d has to be multiple of slice %d\n",
> +		       pic_height, dsc->drm->slice_height);
> +		return MODE_V_ILLEGAL;
> +	}
> +
> +	return MODE_OK;
> +}
> +
>   struct drm_panel *msm_dsi_host_get_panel(struct mipi_dsi_host *host)
>   {
>   	return of_drm_find_panel(to_msm_dsi_host(host)->device_node);
> diff --git a/drivers/gpu/drm/msm/dsi/dsi_manager.c b/drivers/gpu/drm/msm/dsi/dsi_manager.c
> index 20c4d650fd80..0ad8a53aaa0e 100644
> --- a/drivers/gpu/drm/msm/dsi/dsi_manager.c
> +++ b/drivers/gpu/drm/msm/dsi/dsi_manager.c
> @@ -579,6 +579,17 @@ static void dsi_mgr_bridge_mode_set(struct drm_bridge *bridge,
>   		msm_dsi_host_set_display_mode(other_dsi->host, adjusted_mode);
>   }
>   
> +static enum drm_mode_status dsi_mgr_bridge_mode_valid(struct drm_bridge *bridge,
> +						      const struct drm_display_info *info,
> +						      const struct drm_display_mode *mode)
> +{
> +	int id = dsi_mgr_bridge_get_id(bridge);
> +	struct msm_dsi *msm_dsi = dsi_mgr_get_dsi(id);
> +	struct mipi_dsi_host *host = msm_dsi->host;
> +
> +	return msm_dsi_host_check_dsc(host, mode);
> +}
> +
>   static const struct drm_connector_funcs dsi_mgr_connector_funcs = {
>   	.detect = dsi_mgr_connector_detect,
>   	.fill_modes = drm_helper_probe_single_connector_modes,
> @@ -600,6 +611,7 @@ static const struct drm_bridge_funcs dsi_mgr_bridge_funcs = {
>   	.disable = dsi_mgr_bridge_disable,
>   	.post_disable = dsi_mgr_bridge_post_disable,
>   	.mode_set = dsi_mgr_bridge_mode_set,
> +	.mode_valid = dsi_mgr_bridge_mode_valid,
>   };
>   
>   /* initialize connector when we're connected to a drm_panel */
> 


-- 
With best wishes
Dmitry