drm/radeon/kms: parse the extended LCD info block
This block may contain various additional LCD info such
as physical size and a stored EDID.
Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/radeon/radeon_atombios.c b/drivers/gpu/drm/radeon/radeon_atombios.c
index 35c5ff0..d6c611e 100644
--- a/drivers/gpu/drm/radeon/radeon_atombios.c
+++ b/drivers/gpu/drm/radeon/radeon_atombios.c
@@ -1515,6 +1515,59 @@
else
lvds->linkb = false;
+ /* parse the lcd record table */
+ if (lvds_info->info.usModePatchTableOffset) {
+ ATOM_FAKE_EDID_PATCH_RECORD *fake_edid_record;
+ ATOM_PANEL_RESOLUTION_PATCH_RECORD *panel_res_record;
+ bool bad_record = false;
+ u8 *record = (u8 *)(mode_info->atom_context->bios +
+ data_offset +
+ lvds_info->info.usModePatchTableOffset);
+ while (*record != ATOM_RECORD_END_TYPE) {
+ switch (*record) {
+ case LCD_MODE_PATCH_RECORD_MODE_TYPE:
+ record += sizeof(ATOM_PATCH_RECORD_MODE);
+ break;
+ case LCD_RTS_RECORD_TYPE:
+ record += sizeof(ATOM_LCD_RTS_RECORD);
+ break;
+ case LCD_CAP_RECORD_TYPE:
+ record += sizeof(ATOM_LCD_MODE_CONTROL_CAP);
+ break;
+ case LCD_FAKE_EDID_PATCH_RECORD_TYPE:
+ fake_edid_record = (ATOM_FAKE_EDID_PATCH_RECORD *)record;
+ if (fake_edid_record->ucFakeEDIDLength) {
+ struct edid *edid;
+ int edid_size =
+ max((int)EDID_LENGTH, (int)fake_edid_record->ucFakeEDIDLength);
+ edid = kmalloc(edid_size, GFP_KERNEL);
+ if (edid) {
+ memcpy((u8 *)edid, (u8 *)&fake_edid_record->ucFakeEDIDString[0],
+ fake_edid_record->ucFakeEDIDLength);
+
+ if (drm_edid_is_valid(edid))
+ rdev->mode_info.bios_hardcoded_edid = edid;
+ else
+ kfree(edid);
+ }
+ }
+ record += sizeof(ATOM_FAKE_EDID_PATCH_RECORD);
+ break;
+ case LCD_PANEL_RESOLUTION_RECORD_TYPE:
+ panel_res_record = (ATOM_PANEL_RESOLUTION_PATCH_RECORD *)record;
+ lvds->native_mode.width_mm = panel_res_record->usHSize;
+ lvds->native_mode.height_mm = panel_res_record->usVSize;
+ record += sizeof(ATOM_PANEL_RESOLUTION_PATCH_RECORD);
+ break;
+ default:
+ DRM_ERROR("Bad LCD record %d\n", *record);
+ bad_record = true;
+ break;
+ }
+ if (bad_record)
+ break;
+ }
+ }
}
return lvds;
}