drm/amd/display: Add debug option to skip PSR CRTC disable

[Why]
It's currently tied to Z10 support, and is required for Z10, but
we can still support Z10 display off without PSR.

We currently need to skip the PSR CRTC disable to prevent stuttering
and underflow from occuring during PSR-SU.

[How]
Add a debug option to allow specifying this separately.

Reviewed-by: Robin Chen <[email protected]>
Acked-by: Stylon Wang <[email protected]>
Signed-off-by: Nicholas Kazlauskas <[email protected]>
Tested-by: Daniel Wheeler <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>

Author: Nicholas Kazlauskas

drivers/gpu/drm/amd/display/dc/core/dc_link.c

@@ -3378,7 +3378,7 @@ bool dc_link_setup_psr(struct dc_link *link,
 		case FAMILY_YELLOW_CARP:
 		case AMDGPU_FAMILY_GC_10_3_6:
 		case AMDGPU_FAMILY_GC_11_0_1:
-			if (dc->debug.disable_z10)
+			if (dc->debug.disable_z10 || dc->debug.psr_skip_crtc_disable)
 				psr_context->psr_level.bits.SKIP_CRTC_DISABLE = true;
 			break;
 		default:

drivers/gpu/drm/amd/display/dc/dc.h

@@ -844,6 +844,7 @@ struct dc_debug_options {
 	int crb_alloc_policy_min_disp_count;
 	bool disable_z10;
 	bool enable_z9_disable_interface;
+	bool psr_skip_crtc_disable;
 	union dpia_debug_options dpia_debug;
 	bool disable_fixed_vs_aux_timeout_wa;
 	bool force_disable_subvp;

drivers/gpu/drm/amd/display/dc/dcn314/dcn314_resource.c

@@ -886,6 +886,7 @@ static const struct dc_plane_cap plane_cap = {
 static const struct dc_debug_options debug_defaults_drv = {
 	.disable_z10 = false,
 	.enable_z9_disable_interface = true,
+	.psr_skip_crtc_disable = true,
 	.disable_dmcu = true,
 	.force_abm_enable = false,
 	.timing_trace = false,