drm/amd/display: Allow bandwidth validation for 0 streams.

[ Upstream commit ba8e59773ae59818695d1e20b8939282da80ec8c ]

[Why]
Bandwidth calculations are triggered for non zero streams, and
in case of 0 streams, these calculations were skipped with
pstate status not being updated.

[How]
As the pstate status is applicable for non zero streams, check
added for allowing 0 streams inline with dcn internal bandwidth
validations.

Signed-off-by: Bindu Ramamurthy <bindu.r@amd.com>
Reviewed-by: Roman Li <Roman.Li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c
index 08062de3fbebdafe03b43d3ae8ea07235566677e..2b1175bb2daee068c2345a374144ae9c4f096627 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c
@@ -2917,7 +2917,7 @@ bool dcn20_validate_bandwidth(struct dc *dc, struct dc_state *context,
        voltage_supported = dcn20_validate_bandwidth_internal(dc, context, false);
        dummy_pstate_supported = context->bw_ctx.bw.dcn.clk.p_state_change_support;
 
-       if (voltage_supported && dummy_pstate_supported) {
+       if (voltage_supported && (dummy_pstate_supported || !(context->stream_count))) {
                context->bw_ctx.bw.dcn.clk.p_state_change_support = false;
                goto restore_dml_state;
        }