drm/amd/display: disable RCO for DCN314

commit 85e41f1 upstream.

[Why]
RCO is causing error messages on some DCN314 systems

[How]
Force disable RCO for DCN314

Fixes: 17fbdbd ("drm/amd/display: Enable dcn314 DPP RCO")
Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Acked-by: Hamza Mahfooz <hamza.mahfooz@amd.com>
Signed-off-by: Daniel Miess <daniel.miess@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/gpu/drm/amd/display/dc/dcn314/dcn314_dccg.c

@@ -296,7 +296,7 @@ static void dccg314_dpp_root_clock_control(
 {
 	struct dcn_dccg *dccg_dcn = TO_DCN_DCCG(dccg);
 
-	if (dccg->dpp_clock_gated[dpp_inst] == clock_on)
+	if (dccg->dpp_clock_gated[dpp_inst] != clock_on)
 		return;
 
 	if (clock_on) {

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

@@ -1933,6 +1933,10 @@ static bool dcn314_resource_construct(
 		dc->debug = debug_defaults_drv;
 	else
 		dc->debug = debug_defaults_diags;
+
+	/* Disable root clock optimization */
+	dc->debug.root_clock_optimization.u32All = 0;
+
 	// Init the vm_helper
 	if (dc->vm_helper)
 		vm_helper_init(dc->vm_helper, 16);