drm/amd/display: validate plane in dce110 for scaling

CZ & ST support uptil a limit 2:1 downscaling, this patch
adds validate_plane hook, that shall be used to validate
the plane attributes sent by the user space based
on dce110 capabilities.

Signed-off-by: Shirish S <shirish.s@amd.com>
Reviewed-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/dce110/dce110_resource.c b/drivers/gpu/drm/amd/display/dc/dce110/dce110_resource.c
index 7c47795..d5f851d 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/dce110/dce110_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/dce110/dce110_resource.c
@@ -846,6 +846,16 @@ static bool dce110_validate_bandwidth(
        return result;
 }
 
+enum dc_status dce110_validate_plane(const struct dc_plane_state *plane_state,
+                                    struct dc_caps *caps)
+{
+       if (((plane_state->dst_rect.width * 2) < plane_state->src_rect.width) ||
+           ((plane_state->dst_rect.height * 2) < plane_state->src_rect.height))
+               return DC_FAIL_SURFACE_VALIDATE;
+
+       return DC_OK;
+}
+
 static bool dce110_validate_surface_sets(
                struct dc_state *context)
 {
@@ -1021,6 +1031,7 @@ static const struct resource_funcs dce110_res_pool_funcs = {
        .link_enc_create = dce110_link_encoder_create,
        .validate_guaranteed = dce110_validate_guaranteed,
        .validate_bandwidth = dce110_validate_bandwidth,
+       .validate_plane = dce110_validate_plane,
        .acquire_idle_pipe_for_layer = dce110_acquire_underlay,
        .add_stream_to_ctx = dce110_add_stream_to_ctx,
        .validate_global = dce110_validate_global