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| author | Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com> | 2023-08-18 01:17:07 +0300 |
|---|---|---|
| committer | Rodrigo Vivi <rodrigo.vivi@intel.com> | 2023-12-21 19:40:21 +0300 |
| commit | 07d7ba13d80aa9a047ac4fa83f59f161ca5f0453 (patch) | |
| tree | 0079289feda8572366a5500d88c6eee0df71300c /drivers/gpu/drm/xe/xe_hw_engine.c | |
| parent | 92939935f478c5a0cc43f87652360ac5c70063b9 (diff) | |
| download | linux-07d7ba13d80aa9a047ac4fa83f59f161ca5f0453.tar.xz | |
drm/xe: enable idle msg and set hysteresis for GSCCS
On MTL (and only on MTL) the GSCCS defaults with idle messaging
disabled. This means that, once awoken, the GSCCS will never signal its
idleness to the GT. To allow the GT to enter the proper low-power state,
we need therefore to turn idle messaging on. As part of this, we also
need to set a proper hysteresis value for the engine.
v2: use MEDIA_VERSION() and CLR() for the RTP rule and action, add reg
bit define in descending order (Matt)
Bspec: 71496
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Vinay Belgaumkar <vinay.belgaumkar@intel.com>
Cc: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://lore.kernel.org/r/20230817221707.1602873-1-daniele.ceraolospurio@intel.com
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Diffstat (limited to 'drivers/gpu/drm/xe/xe_hw_engine.c')
| -rw-r--r-- | drivers/gpu/drm/xe/xe_hw_engine.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/gpu/drm/xe/xe_hw_engine.c b/drivers/gpu/drm/xe/xe_hw_engine.c index 81281e9c02eb..24b5226f1433 100644 --- a/drivers/gpu/drm/xe/xe_hw_engine.c +++ b/drivers/gpu/drm/xe/xe_hw_engine.c @@ -339,6 +339,22 @@ hw_engine_setup_default_state(struct xe_hw_engine *hwe) ring_cmd_cctl_val, XE_RTP_ACTION_FLAG(ENGINE_BASE))) }, + /* + * To allow the GSC engine to go idle on MTL we need to enable + * idle messaging and set the hysteresis value (we use 0xA=5us + * as recommended in spec). On platforms after MTL this is + * enabled by default. + */ + { XE_RTP_NAME("MTL GSCCS IDLE MSG enable"), + XE_RTP_RULES(MEDIA_VERSION(1300), ENGINE_CLASS(OTHER)), + XE_RTP_ACTIONS(CLR(RING_PSMI_CTL(0), + IDLE_MSG_DISABLE, + XE_RTP_ACTION_FLAG(ENGINE_BASE)), + FIELD_SET(RING_PWRCTX_MAXCNT(0), + IDLE_WAIT_TIME, + 0xA, + XE_RTP_ACTION_FLAG(ENGINE_BASE))) + }, {} }; |