linux-kernel - Re: [PATCH v3 13/13] drm/msm/dsi: Pass DSC params to drm

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Message-ID: <1fecc2d3-28fa-57ee-db60-95713a84787a@linaro.org>
Date:   Wed, 24 Nov 2021 19:28:59 +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 13/13] drm/msm/dsi: Pass DSC params to drm_panel

On 16/11/2021 09:22, Vinod Koul wrote:
> When DSC is enabled, we need to pass the DSC parameters to panel driver
> as well, so add a dsc parameter in panel and set it when DSC is enabled
> 
> Signed-off-by: Vinod Koul <vkoul@...nel.org>
> ---
>   drivers/gpu/drm/msm/dsi/dsi_host.c | 16 +++++++++++++++-
>   include/drm/drm_panel.h            |  7 +++++++
>   2 files changed, 22 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c
> index 2c14c36f0b3d..3d5773fcf496 100644
> --- a/drivers/gpu/drm/msm/dsi/dsi_host.c
> +++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
> @@ -2159,11 +2159,25 @@ int msm_dsi_host_modeset_init(struct mipi_dsi_host *host,
>   	struct msm_dsi_host *msm_host = to_msm_dsi_host(host);
>   	const struct msm_dsi_cfg_handler *cfg_hnd = msm_host->cfg_hnd;
>   	struct msm_drm_private *priv;
> +	struct drm_panel *panel;
>   	int ret;
>   
>   	msm_host->dev = dev;
> +	panel = msm_dsi_host_get_panel(&msm_host->base);
>   	priv = dev->dev_private;
> -	priv->dsc = msm_host->dsc;
> +
> +	if (panel && panel->dsc) {
> +		struct msm_display_dsc_config *dsc = priv->dsc;
> +
> +		if (!dsc) {
> +			dsc = kzalloc(sizeof(*dsc), GFP_KERNEL);

devm_kzalloc()?

Or even simpler: embed msm_display_dsc_config into struct msm_dsi_host 
and use it only if dsc->drm is set (IOW the panel provided DSC data)?

> +			if (!dsc)
> +				return -ENOMEM;
> +			dsc->drm = panel->dsc;
> +			priv->dsc = dsc;
> +			msm_host->dsc = dsc;
> +		}
> +	}
>   
>   	ret = cfg_hnd->ops->tx_buf_alloc(msm_host, SZ_4K);
>   	if (ret) {
> diff --git a/include/drm/drm_panel.h b/include/drm/drm_panel.h
> index 4602f833eb51..eb8ae9bf32ed 100644
> --- a/include/drm/drm_panel.h
> +++ b/include/drm/drm_panel.h
> @@ -171,6 +171,13 @@ struct drm_panel {
>   	 * Panel entry in registry.
>   	 */
>   	struct list_head list;
> +
> +	/**
> +	 * @dsc:
> +	 *
> +	 * Panel DSC pps payload to be sent
> +	 */
> +	struct drm_dsc_config *dsc;
>   };
>   
>   void drm_panel_init(struct drm_panel *panel, struct device *dev,
> 


-- 
With best wishes
Dmitry