diff options
| -rw-r--r-- | drivers/gpu/drm/i915/intel_drv.h | 1 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/intel_psr.c | 36 |
2 files changed, 35 insertions, 2 deletions
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h index 5a37db292d3a..a8073eb02ffa 100644 --- a/drivers/gpu/drm/i915/intel_drv.h +++ b/drivers/gpu/drm/i915/intel_drv.h @@ -1921,6 +1921,7 @@ void intel_psr_compute_config(struct intel_dp *intel_dp, void intel_psr_irq_control(struct drm_i915_private *dev_priv, bool debug); void intel_psr_irq_handler(struct drm_i915_private *dev_priv, u32 psr_iir); void intel_psr_short_pulse(struct intel_dp *intel_dp); +int intel_psr_wait_for_idle(struct drm_i915_private *dev_priv); /* intel_runtime_pm.c */ int intel_power_domains_init(struct drm_i915_private *); diff --git a/drivers/gpu/drm/i915/intel_psr.c b/drivers/gpu/drm/i915/intel_psr.c index 45f1cb7d6c04..23acc9ac8d4d 100644 --- a/drivers/gpu/drm/i915/intel_psr.c +++ b/drivers/gpu/drm/i915/intel_psr.c @@ -717,7 +717,39 @@ void intel_psr_disable(struct intel_dp *intel_dp, cancel_work_sync(&dev_priv->psr.work); } -static bool psr_wait_for_idle(struct drm_i915_private *dev_priv) +int intel_psr_wait_for_idle(struct drm_i915_private *dev_priv) +{ + i915_reg_t reg; + u32 mask; + + /* + * The sole user right now is intel_pipe_update_start(), + * which won't race with psr_enable/disable, which is + * where psr2_enabled is written to. So, we don't need + * to acquire the psr.lock. More importantly, we want the + * latency inside intel_pipe_update_start() to be as low + * as possible, so no need to acquire psr.lock when it is + * not needed and will induce latencies in the atomic + * update path. + */ + if (dev_priv->psr.psr2_enabled) { + reg = EDP_PSR2_STATUS; + mask = EDP_PSR2_STATUS_STATE_MASK; + } else { + reg = EDP_PSR_STATUS; + mask = EDP_PSR_STATUS_STATE_MASK; + } + + /* + * Max time for PSR to idle = Inverse of the refresh rate + + * 6 ms of exit training time + 1.5 ms of aux channel + * handshake. 50 msec is defesive enough to cover everything. + */ + return intel_wait_for_register(dev_priv, reg, mask, + EDP_PSR_STATUS_STATE_IDLE, 50); +} + +static bool __psr_wait_for_idle_locked(struct drm_i915_private *dev_priv) { struct intel_dp *intel_dp; i915_reg_t reg; @@ -763,7 +795,7 @@ static void intel_psr_work(struct work_struct *work) * PSR might take some time to get fully disabled * and be ready for re-enable. */ - if (!psr_wait_for_idle(dev_priv)) + if (!__psr_wait_for_idle_locked(dev_priv)) goto unlock; /* |