[PATCH 5.12 151/384] drm/amd/display: Return invalid state if GPINT times out
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date: 2021-05-10 12:16:43
Also in:
lkml
Subsystem:
amd display core, drm drivers, radeon and amdgpu drm drivers, the rest · Maintainers:
Harry Wentland, Leo Li, David Airlie, Simona Vetter, Alex Deucher, Christian König, Linus Torvalds
From: Wyatt Wood <redacted> [ Upstream commit 8039bc7130ef4206a58e4dc288621bc97eba08eb ] [Why] GPINT timeout is causing PSR_STATE_0 to be returned when it shouldn't. We must guarantee that PSR is fully disabled before doing hw programming on driver-side. [How] Return invalid state if GPINT command times out. Let existing retry logic send the GPINT until successful. Tested-by: Daniel Wheeler <redacted> Signed-off-by: Wyatt Wood <redacted> Reviewed-by: Anthony Koo <redacted> Acked-by: Rodrigo Siqueira <redacted> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Sasha Levin <sashal@kernel.org> --- drivers/gpu/drm/amd/display/dc/dce/dmub_psr.c | 15 ++++++++++----- 1 file changed, 10 insertions(+), 5 deletions(-)
diff --git a/drivers/gpu/drm/amd/display/dc/dce/dmub_psr.c b/drivers/gpu/drm/amd/display/dc/dce/dmub_psr.c
index 69e34bef274c..febccb35ddad 100644
--- a/drivers/gpu/drm/amd/display/dc/dce/dmub_psr.c
+++ b/drivers/gpu/drm/amd/display/dc/dce/dmub_psr.c@@ -81,13 +81,18 @@ static void dmub_psr_get_state(struct dmub_psr *dmub, enum dc_psr_state *state) { struct dmub_srv *srv = dmub->ctx->dmub_srv->dmub; uint32_t raw_state; + enum dmub_status status = DMUB_STATUS_INVALID; // Send gpint command and wait for ack - dmub_srv_send_gpint_command(srv, DMUB_GPINT__GET_PSR_STATE, 0, 30); - - dmub_srv_get_gpint_response(srv, &raw_state); - - *state = convert_psr_state(raw_state); + status = dmub_srv_send_gpint_command(srv, DMUB_GPINT__GET_PSR_STATE, 0, 30); + + if (status == DMUB_STATUS_OK) { + // GPINT was executed, get response + dmub_srv_get_gpint_response(srv, &raw_state); + *state = convert_psr_state(raw_state); + } else + // Return invalid state when GPINT times out + *state = 0xFF; } /*
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2.30.2