diff options
| author | Alex Deucher <alexander.deucher@amd.com> | 2013-07-19 17:44:43 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-08-04 16:51:09 +0800 |
| commit | d54b22e585edd4401786e7c02cd85bc97fff5ffb (patch) | |
| tree | 32e6835a78bcb92e2dd9ba4e512b081504a4db02 | |
| parent | 405a7ccac881355809e07a4f00e0e8528ee7cec5 (diff) | |
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>
| -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 94303840f650..68ce36056019 100644 --- 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; } |