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drm/edid: Don't print an error if the checksum of a CEA block is wrong 

It's common to share screens within CI labs, and it's also common for
KVM switches to alter the contents of the CEA block but leave the
checksum outdated.

So in this case, print a debug message instead of an error.

References: https://bugs.freedesktop.org/show_bug.cgi?id=98228
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tomi Sarvela <tomi.p.sarvela@intel.com>
Cc: intel-gfx@lists.freedesktop.org
Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Tested-by: Jari Tahvanainen <jari.tahvanainen@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1481202716-31317-1-git-send-email-tomeu.vizoso@collabora.com
hifive-unleashed-5.1
Tomeu Vizoso 2016-12-08 14:11:56 +01:00 committed by Daniel Vetter
parent 2776b1c190
commit 82d753567f
1 changed files with 8 additions and 5 deletions
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13
drivers/gpu/drm/drm_edid.c
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@ -1131,16 +1131,19 @@ bool drm_edid_block_valid(u8 *raw_edid, int block, bool print_bad_edid,
csum = drm_edid_block_checksum(raw_edid);
if (csum) {
if (print_bad_edid) {
DRM_ERROR("EDID checksum is invalid, remainder is %d\n", csum);
}
if (edid_corrupt)
*edid_corrupt = true;
/* allow CEA to slide through, switches mangle this */
if (raw_edid[0] != 0x02)
if (raw_edid[0] == CEA_EXT) {
DRM_DEBUG("EDID checksum is invalid, remainder is %d\n", csum);
DRM_DEBUG("Assuming a KVM switch modified the CEA block but left the original checksum\n");
} else {
if (print_bad_edid)
DRM_ERROR("EDID checksum is invalid, remainder is %d\n", csum);
goto bad;
}
}
/* per-block-type checks */