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

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Date:   Fri,  2 Apr 2021 15:28:45 -0700
From:   Douglas Anderson <dianders@...omium.org>
To:     Andrzej Hajda <a.hajda@...sung.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Sam Ravnborg <sam@...nborg.org>
Cc:     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>,
        Douglas Anderson <dianders@...omium.org>,
        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: [PATCH v3 11/12] drm/bridge: ti-sn65dsi86: Print an error if we fallback to panel modes

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>
---

(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);
 }
-- 
2.31.0.208.g409f899ff0-goog