Commit 613a7956 authored by Aurabindo Pillai's avatar Aurabindo Pillai Committed by Alex Deucher
Browse files

drm/amd/display: Add monitor specific edid quirk 



Disable FAMS on a Samsung Odyssey G9 monitor. Experiments show that this
monitor does not work well under some use cases, and is likely
implementation specific bug on the monitor's firmware.

Cc: stable@vger.kernel.org
Reviewed-by: default avatarRodrigo Siqueira <rodrigo.siqueira@amd.com>
Signed-off-by: default avatarAurabindo Pillai <aurabindo.pillai@amd.com>
Tested-by: default avatarDaniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent f2c58529

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c

+26 −0
Original line number Diff line number Diff line
@@ -44,6 +44,30 @@ 
#include "dm_helpers.h"

#include "ddc_service_types.h"



static u32 edid_extract_panel_id(struct edid *edid)

{

	return (u32)edid->mfg_id[0] << 24   |

	       (u32)edid->mfg_id[1] << 16   |

	       (u32)EDID_PRODUCT_ID(edid);

}



static void apply_edid_quirks(struct edid *edid, struct dc_edid_caps *edid_caps)

{

	uint32_t panel_id = edid_extract_panel_id(edid);



	switch (panel_id) {

	/* Workaround for some monitors which does not work well with FAMS */

	case drm_edid_encode_panel_id('S', 'A', 'M', 0x0E5E):

	case drm_edid_encode_panel_id('S', 'A', 'M', 0x7053):

	case drm_edid_encode_panel_id('S', 'A', 'M', 0x71AC):

		DRM_DEBUG_DRIVER("Disabling FAMS on monitor with panel id %X\n", panel_id);

		edid_caps->panel_patch.disable_fams = true;

		break;

	default:

		return;

	}

}



/* dm_helpers_parse_edid_caps

 *

 * Parse edid caps
@@ -115,6 +139,8 @@ enum dc_edid_status dm_helpers_parse_edid_caps( 
	else

		edid_caps->speaker_flags = DEFAULT_SPEAKER_LOCATION;



	apply_edid_quirks(edid_buf, edid_caps);



	kfree(sads);

	kfree(sadb);