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.

Reviewed-by: Abhinav Kumar <[email protected]>
Signed-off-by: Douglas Anderson <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/20221021130637.1.I8c2de0954a4e54e0c59a72938268e2ead91daa98@changeid

drivers/gpu/drm/drm_edid.c

@@ -2799,6 +2799,8 @@ 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);