diff options
| author | Aric Cyr <aric.cyr@amd.com> | 2023-02-04 01:46:05 +0300 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2023-02-28 22:29:35 +0300 |
| commit | c69fc3d0de6ca79d946a2715f8745a1eae69c3d8 (patch) | |
| tree | ab0b6ea431a835a5124e07c35bb46c7b2568ad28 /drivers/gpu/drm/amd/display/dc/dce | |
| parent | b4ceeffd13870b641a284ffb0f6fb4ffe19b0b14 (diff) | |
| download | linux-c69fc3d0de6ca79d946a2715f8745a1eae69c3d8.tar.xz | |
drm/amd/display: Reduce CPU busy-waiting for long delays
[WHY]
udelay should not be used for long waits since it keeps CPU active,
wasting power.
[HOW]
Use fsleep where acceptable to allow CPU cores to be parked by the scheduler.
Reviewed-by: Wenjing Liu <Wenjing.Liu@amd.com>
Acked-by: Qingqing Zhuo <qingqing.zhuo@amd.com>
Signed-off-by: Aric Cyr <aric.cyr@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/amd/display/dc/dce')
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/dce/dce_aux.c | 9 | ||||
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/dce/dce_dmcu.c | 2 | ||||
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/dce/dmub_psr.c | 2 |
3 files changed, 4 insertions, 9 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/dce/dce_aux.c b/drivers/gpu/drm/amd/display/dc/dce/dce_aux.c index 140297c8ff55..739298d2dff3 100644 --- a/drivers/gpu/drm/amd/display/dc/dce/dce_aux.c +++ b/drivers/gpu/drm/amd/display/dc/dce/dce_aux.c @@ -832,13 +832,8 @@ bool dce_aux_transfer_with_retries(struct ddc_service *ddc, LOG_FLAG_I2cAux_DceAux, "dce_aux_transfer_with_retries: payload->defer_delay=%u", payload->defer_delay); - if (payload->defer_delay > 1) { - msleep(payload->defer_delay); - defer_time_in_ms += payload->defer_delay; - } else if (payload->defer_delay <= 1) { - udelay(payload->defer_delay * 1000); - defer_time_in_ms += payload->defer_delay; - } + fsleep(payload->defer_delay * 1000); + defer_time_in_ms += payload->defer_delay; } } break; diff --git a/drivers/gpu/drm/amd/display/dc/dce/dce_dmcu.c b/drivers/gpu/drm/amd/display/dc/dce/dce_dmcu.c index d3cc5ec46956..e74266cc0098 100644 --- a/drivers/gpu/drm/amd/display/dc/dce/dce_dmcu.c +++ b/drivers/gpu/drm/amd/display/dc/dce/dce_dmcu.c @@ -586,7 +586,7 @@ static void dcn10_dmcu_set_psr_enable(struct dmcu *dmcu, bool enable, bool wait) if (state == PSR_STATE0) break; } - udelay(500); + fsleep(500); } /* assert if max retry hit */ 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 1e2d2cbe2c37..19440bdf6344 100644 --- a/drivers/gpu/drm/amd/display/dc/dce/dmub_psr.c +++ b/drivers/gpu/drm/amd/display/dc/dce/dmub_psr.c @@ -215,7 +215,7 @@ static void dmub_psr_enable(struct dmub_psr *dmub, bool enable, bool wait, uint8 break; } - udelay(500); + fsleep(500); } /* assert if max retry hit */ |