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| author | Alex Deucher <alexander.deucher@amd.com> | 2013-07-19 17:44:43 -0400 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2013-07-22 15:57:13 -0400 |
| commit | 03ed8cf9b28d886c64c7e705c7bb1a365fd8fb95 (patch) | |
| tree | e4da5e99574c69671a985c672bccd447da331109 /drivers/gpu/drm/radeon/radeon_combios.c | |
| parent | f7929f34fa0e0bb6736a2484fdc07d77a1653081 (diff) | |
| download | op-kernel-dev-03ed8cf9b28d886c64c7e705c7bb1a365fd8fb95.zip op-kernel-dev-03ed8cf9b28d886c64c7e705c7bb1a365fd8fb95.tar.gz | |
drm/radeon: improve dac adjust heuristics for legacy pdac
Hopefully avoid more quirks in the future due to bogus
vbios dac data.
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Diffstat (limited to 'drivers/gpu/drm/radeon/radeon_combios.c')
| -rw-r--r-- | drivers/gpu/drm/radeon/radeon_combios.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/gpu/drm/radeon/radeon_combios.c b/drivers/gpu/drm/radeon/radeon_combios.c index 8528b81..485f82c 100644 --- a/drivers/gpu/drm/radeon/radeon_combios.c +++ b/drivers/gpu/drm/radeon/radeon_combios.c @@ -965,8 +965,10 @@ 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; } |
