Commit 55eea8ef authored by Roman Li's avatar Roman Li Committed by Alex Deucher
Browse files

drm/amd/display: Limit max DSC target bpp for specific monitors 



[Why]
Some monitors exhibit corruption at 16bpp DSC.

[How]
- Add helpers for patching edid caps.
- Use it for limiting DSC target bitrate to 15bpp for known monitors

Reviewed-by: default avatarRodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Acked-by: default avatarQingqing Zhuo <qingqing.zhuo@amd.com>
Signed-off-by: default avatarRoman Li <Roman.Li@amd.com>
Cc: stable@vger.kernel.org
Tested-by: default avatarDaniel Wheeler <Daniel.Wheeler@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent f1c1a982

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

+35 −0
Original line number Diff line number Diff line
@@ -40,6 +40,39 @@ 


#include "dm_helpers.h"



struct monitor_patch_info {

	unsigned int manufacturer_id;

	unsigned int product_id;

	void (*patch_func)(struct dc_edid_caps *edid_caps, unsigned int param);

	unsigned int patch_param;

};

static void set_max_dsc_bpp_limit(struct dc_edid_caps *edid_caps, unsigned int param);



static const struct monitor_patch_info monitor_patch_table[] = {

{0x6D1E, 0x5BBF, set_max_dsc_bpp_limit, 15},

{0x6D1E, 0x5B9A, set_max_dsc_bpp_limit, 15},

};



static void set_max_dsc_bpp_limit(struct dc_edid_caps *edid_caps, unsigned int param)

{

	if (edid_caps)

		edid_caps->panel_patch.max_dsc_target_bpp_limit = param;

}



static int amdgpu_dm_patch_edid_caps(struct dc_edid_caps *edid_caps)

{

	int i, ret = 0;



	for (i = 0; i < ARRAY_SIZE(monitor_patch_table); i++)

		if ((edid_caps->manufacturer_id == monitor_patch_table[i].manufacturer_id)

			&&  (edid_caps->product_id == monitor_patch_table[i].product_id)) {

			monitor_patch_table[i].patch_func(edid_caps, monitor_patch_table[i].patch_param);

			ret++;

		}



	return ret;

}



/* dm_helpers_parse_edid_caps

 *

 * Parse edid caps
@@ -125,6 +158,8 @@ enum dc_edid_status dm_helpers_parse_edid_caps( 
	kfree(sads);

	kfree(sadb);



	amdgpu_dm_patch_edid_caps(edid_caps);



	return result;

}