Commit 771b2863 authored Jun 05, 2019 by Nikola Cornij Committed by Alex Deucher Jul 18, 2019

drm/amd/display: Set one 4:2:0-related PPS field as recommended by DSC spec



[why]
'second_line_offset_adj' was mistakenly left at zero, even though DSC spec
v1.2a recommends setting this field to 512 for 4:2:0.

[how]
Set 'second_line_offset_adj' to 512 for 4:2:0 and leave at zero otherwise

Signed-off-by: Nikola Cornij <nikola.cornij@amd.com>
Reviewed-by: Eric Bernstein <Eric.Bernstein@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

parent a6f30079

drivers/gpu/drm/amd/display/dc/dsc/drm_dsc_dc.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -442,6 +442,12 @@ int drm_dsc_compute_rc_parameters(struct drm_dsc_config *vdsc_cfg)
		vdsc_cfg->rc_bits = (hrd_delay * vdsc_cfg->bits_per_pixel) / 16;
		vdsc_cfg->initial_dec_delay = hrd_delay - vdsc_cfg->initial_xmit_delay;

		/* As per DSC spec v1.2a recommendation: */
		if (vdsc_cfg->native_420)
		vdsc_cfg->second_line_offset_adj = 512;
		else
		vdsc_cfg->second_line_offset_adj = 0;

		return 0;
		}
		EXPORT_SYMBOL(drm_dsc_compute_rc_parameters);

Admin message