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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
This commit is contained in:
Alex Deucher 2013-07-19 17:44:43 -04:00
parent f7929f34fa
commit 03ed8cf9b2
1 changed files with 4 additions and 2 deletions
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6
drivers/gpu/drm/radeon/radeon_combios.c
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@ -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;
}