drm/amd/display: Add dc cap to restrict VSR downscaling src size

- Adds int max_downscale_src_width in dc struct
- Checks and does not support if downscale size is more than 4k (width > 3840)

Signed-off-by: Xingyue Tao <xingyue.tao@amd.com>
Reviewed-by: Charlene Liu <Charlene.Liu@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/display/dc/dc.h b/drivers/gpu/drm/amd/display/dc/dc.h
index 1c39c99..08b29a7 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/dc.h
+++ b/drivers/gpu/drm/amd/display/dc/dc.h
@@ -203,6 +203,7 @@ struct dc_debug {
        bool clock_trace;
        bool validation_trace;
        bool bandwidth_calcs_trace;
+       int max_downscale_src_width;
 
        /* stutter efficiency related */
        bool disable_stutter;

diff --git a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_dpp.c b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_dpp.c
index 20796da..2da1389 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_dpp.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_dpp.c
@@ -145,12 +145,18 @@ bool dpp_get_optimal_number_of_taps(
        else
                pixel_width = scl_data->viewport.width;
 
-       /* Some ASICs does not support  FP16 scaling, so we reject modes require this*/
        if (scl_data->viewport.width  != scl_data->h_active &&
-               scl_data->viewport.height != scl_data->v_active &&
-               dpp->caps->dscl_data_proc_format == DSCL_DATA_PRCESSING_FIXED_FORMAT &&
-               scl_data->format == PIXEL_FORMAT_FP16)
-               return false;
+               scl_data->viewport.height != scl_data->v_active) {
+
+               /* Some ASICs does not support  FP16 scaling, so we reject modes require this*/
+               if (dpp->caps->dscl_data_proc_format == DSCL_DATA_PRCESSING_FIXED_FORMAT &&
+                       scl_data->format == PIXEL_FORMAT_FP16)
+                       return false;
+
+               if (dpp->ctx->dc->debug.max_downscale_src_width != 0 &&
+                       scl_data->viewport.width > dpp->ctx->dc->debug.max_downscale_src_width)
+                       return false;
+       }
 
        /* TODO: add lb check */
 

diff --git a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_resource.c b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_resource.c
index 16c84e9..f69f3a5 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_resource.c
@@ -447,6 +447,7 @@ static const struct dc_debug debug_defaults_drv = {
                .performance_trace = false,
                .az_endpoint_mute_only = true,
                .recovery_enabled = false, /*enable this by default after testing.*/
+               .max_downscale_src_width = 3840,
 };
 
 static const struct dc_debug debug_defaults_diags = {