From 04f3c88f09554714f25caa01d1a8ba999fc487bb Mon Sep 17 00:00:00 2001 From: Wyatt Wood Date: Fri, 19 Mar 2021 13:44:55 -0400 Subject: [PATCH] drm/amd/display: Retry getting PSR state if command times out [Why] GPINT command to get PSR state from FW times out. [How] Add retry to get valid PSR state. Signed-off-by: Wyatt Wood Reviewed-by: Anthony Koo Acked-by: Qingqing Zhuo Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/display/dc/dc_types.h | 3 ++- drivers/gpu/drm/amd/display/dc/dce/dmub_psr.c | 29 +++++++++++++++++---------- 2 files changed, 20 insertions(+), 12 deletions(-) diff --git a/drivers/gpu/drm/amd/display/dc/dc_types.h b/drivers/gpu/drm/amd/display/dc/dc_types.h index b5e875ee9027..d8912a4de3b1 100644 --- a/drivers/gpu/drm/amd/display/dc/dc_types.h +++ b/drivers/gpu/drm/amd/display/dc/dc_types.h @@ -687,7 +687,8 @@ enum dc_psr_state { PSR_STATE5, PSR_STATE5a, PSR_STATE5b, - PSR_STATE5c + PSR_STATE5c, + PSR_STATE_INVALID = 0xFF }; struct psr_config { 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 15ed09b7a452..28ff059aa7f3 100644 --- a/drivers/gpu/drm/amd/display/dc/dce/dmub_psr.c +++ b/drivers/gpu/drm/amd/display/dc/dce/dmub_psr.c @@ -80,19 +80,26 @@ static enum dc_psr_state convert_psr_state(uint32_t raw_state) 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; + uint32_t raw_state = 0; + uint32_t retry_count = 0; enum dmub_status status; - // Send gpint command and wait for ack - 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; + do { + // Send gpint command and wait for ack + 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 = PSR_STATE_INVALID; + + // Assert if max retry hit + if (retry_count >= 1000) + ASSERT(0); + } while (++retry_count <= 1000 && *state == PSR_STATE_INVALID); } /* -- 2.11.0