Commit 03ed8cf9 authored by Alex Deucher's avatar Alex Deucher

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: default avatarAlex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
parent f7929f34
...@@ -965,8 +965,10 @@ struct radeon_encoder_primary_dac *radeon_combios_get_primary_dac_info(struct ...@@ -965,8 +965,10 @@ struct radeon_encoder_primary_dac *radeon_combios_get_primary_dac_info(struct
dac = RBIOS8(dac_info + 0x3) & 0xf; dac = RBIOS8(dac_info + 0x3) & 0xf;
p_dac->ps2_pdac_adj = (bg << 8) | (dac); p_dac->ps2_pdac_adj = (bg << 8) | (dac);
} }
/* if the values are all zeros, use the table */ /* if the values are zeros, use the table */
if (p_dac->ps2_pdac_adj) if ((dac == 0) || (bg == 0))
found = 0;
else
found = 1; found = 1;
} }
......
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