linux-kernel - [PATCH] drm/edid: Dump the EDID when drm_edid_get_panel

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Message-Id: <20221021130637.1.I8c2de0954a4e54e0c59a72938268e2ead91daa98@changeid>
Date:   Fri, 21 Oct 2022 13:07:07 -0700
From:   Douglas Anderson <dianders@...omium.org>
To:     dri-devel@...ts.freedesktop.org
Cc:     Kuogee Hsieh <quic_khsieh@...cinc.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Stephen Boyd <swboyd@...omium.org>,
        Douglas Anderson <dianders@...omium.org>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...il.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] drm/edid: Dump the EDID when drm_edid_get_panel_id() has an error

If we fail to get a valid panel ID in drm_edid_get_panel_id() we'd
like to see the EDID that was read so we have a chance of
understanding what's wrong. There's already a function for that, so
let's call it in the error case.

NOTE: edid_block_read() has a retry loop in it, so actually we'll only
print the block read back from the final attempt. This still seems
better than nothing.

Signed-off-by: Douglas Anderson <dianders@...omium.org>
---

 drivers/gpu/drm/drm_edid.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 47465b9765f1..d63e26ec88b1 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -2721,6 +2721,8 @@ u32 drm_edid_get_panel_id(struct i2c_adapter *adapter)
 
 	if (edid_block_status_valid(status, edid_block_tag(base_block)))
 		panel_id = edid_extract_panel_id(base_block);
+	else
+		edid_block_dump(KERN_NOTICE, base_block, 0);
 
 	kfree(base_block);
 
-- 
2.38.0.135.g90850a2211-goog