drm/radeon/kms/combios: verify dac_adj values are valid

Commit Message

Alex Deucher April 6, 2010, 4:36 p.m. UTC

None

Patch

diff --git a/drivers/gpu/drm/radeon/radeon_combios.c
b/drivers/gpu/drm/radeon/radeon_combios.c
index ecef5b4..a80abc4 100644
--- a/drivers/gpu/drm/radeon/radeon_combios.c
+++ b/drivers/gpu/drm/radeon/radeon_combios.c
@@ -760,7 +760,9 @@  struct radeon_encoder_primary_dac
*radeon_combios_get_primary_dac_info(struct
 			dac = RBIOS8(dac_info + 0x3) & 0xf;
 			p_dac->ps2_pdac_adj = (bg << 8) | (dac);
 		}
-		found = 1;
+		/* if the values are all zeros, use the table */
+		if (p_dac->ps2_pdac_adj)
+			found = 1;
 	}