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

[Li, Roman]

[Public]

Reviewed-by: Roman Li <Roman.Li at amd.com>

-----Original Message-----
From: Bindu Ramamurthy <bindu.r at amd.com>
Sent: Thursday, May 20, 2021 5:04 PM
To: amd-gfx at lists.freedesktop.org
Cc: Li, Roman <Roman.Li at amd.com>; R, Bindu <Bindu.R at amd.com>
Subject: [PATCH] drm/amd/display: Allow bandwidth validation for 0 streams.

    [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 at amd.com>
---
 drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

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 6a56a03cfba3..0b49420e7d64 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c
@@ -3236,7 +3236,7 @@ static noinline bool dcn20_validate_bandwidth_fp(struct dc *dc,
        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;
        }
--
2.25.1