drm/edid: shorten log output in case of all zeroes edid block

There is no need to dump the whole EDID block in case it contains no
information. Just print a single line stating the block is empty instead
of 8 lines containing only zeroes.

Signed-off-by: Stefan Brüns <stefan.bruens@rwth-aachen.de>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 6 insertions, 2 deletions

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index f8fb327407cd..a71ed935f1c4 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -1088,9 +1088,13 @@ bool drm_edid_block_valid(u8 *raw_edid, int block, bool print_bad_edid)
 
 bad:
         if (print_bad_edid) {
-                printk(KERN_ERR "Raw EDID:\n");
-                print_hex_dump(KERN_ERR, " \t", DUMP_PREFIX_NONE, 16, 1,
+                if (drm_edid_is_zero(raw_edid, EDID_LENGTH)) {
+                        printk(KERN_ERR "EDID block is all zeroes\n");
+                } else {
+                        printk(KERN_ERR "Raw EDID:\n");
+                        print_hex_dump(KERN_ERR, " \t", DUMP_PREFIX_NONE, 16, 1,
                                raw_edid, EDID_LENGTH, false);
+                }
         }
         return false;
 }