drm/radeon: improve dac adjust heuristics for legacy pdac

commit 03ed8cf9b28d886c64c7e705c7bb1a365fd8fb95 upstream.

Hopefully avoid more quirks in the future due to bogus
vbios dac data.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/gpu/drm/radeon/radeon_combios.c b/drivers/gpu/drm/radeon/radeon_combios.c
index 94303840f65042b518189ffdbaedabb314440377..68ce360560190af6505856452658e450d3f6878a 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon_combios.c
+++ b/drivers/gpu/drm/radeon/radeon_combios.c
@@ -902,8 +902,10 @@ 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);
                }
-               /* if the values are all zeros, use the table */
-               if (p_dac->ps2_pdac_adj)
+               /* if the values are zeros, use the table */
+               if ((dac == 0) || (bg == 0))
+                       found = 0;
+               else
                        found = 1;
        }