linux-kernel - Re: [PATCH v3 11/12] drm/bridge: ti-sn65dsi86: Print an error if we fallback to panel modes

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Message-ID: <YGpiMQkJbvdO6obJ@pendragon.ideasonboard.com>
Date:   Mon, 5 Apr 2021 04:04:49 +0300
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Douglas Anderson <dianders@...omium.org>
Cc:     Andrzej Hajda <a.hajda@...sung.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Sam Ravnborg <sam@...nborg.org>,
        Linus W <linus.walleij@...aro.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        robdclark@...omium.org, Stephen Boyd <swboyd@...omium.org>,
        Steev Klimaszewski <steev@...i.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        linux-arm-msm@...r.kernel.org,
        Stanislav Lisovskiy <stanislav.lisovskiy@...el.com>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        Robert Foss <robert.foss@...aro.org>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 11/12] drm/bridge: ti-sn65dsi86: Print an error if we
 fallback to panel modes

Hi Doug,

Thank you for the patch.

On Fri, Apr 02, 2021 at 03:28:45PM -0700, Douglas Anderson wrote:
> Now that we can properly read the EDID for modes there should be no
> reason to fallback to the fixed modes that our downstream panel driver
> provides us. Let's make that clear by:
> - Putting an error message in the logs if we fall back.
> - Putting a comment in saying what's going on.
> 
> Signed-off-by: Douglas Anderson <dianders@...omium.org>

Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

> ---
> 
> (no changes since v1)
> 
>  drivers/gpu/drm/bridge/ti-sn65dsi86.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
> index fb50f9f95b0f..3b61898cf9cb 100644
> --- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c
> +++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
> @@ -303,6 +303,13 @@ static int ti_sn_bridge_connector_get_modes(struct drm_connector *connector)
>  			return num;
>  	}
>  
> +	/*
> +	 * Ideally this should never happen and we could remove the fallback
> +	 * but let's preserve old behavior.
> +	 */
> +	DRM_DEV_ERROR(pdata->dev,
> +		      "Failed to read EDID; falling back to panel modes");
> +
>  exit:
>  	return drm_panel_get_modes(pdata->panel, connector);
>  }

-- 
Regards,

Laurent Pinchart