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

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

drivers/gpu/drm/radeon/radeon_combios.c

+4 −2
Original line number Diff line number Diff line
@@ -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;

	}