[Intel-gfx] [PATCH v2 3/3] drm/i915/display: Introduce new intel_psr_pause/resume function

[Gwan-gyeong Mun <gwan-gyeong.mun@intel.com>]

This introduces the following function that can enable and disable psr
without intel_crtc_state/drm_connector_state when intel_psr is already
enabled with current intel_crtc_state and drm_connector_state information.

- intel_psr_pause(): Pause current PSR. it deactivates current psr state.
- intel_psr_resume(): Resume paused PSR without intel_crtc_state and
                      drm_connector_state. It activates paused psr state.

v2: Add new _intel_psr_enable_locked() function for removing duplicated
    code. (Jose)

Cc: José Roberto de Souza <jose.souza@intel.com>
Cc: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
Signed-off-by: Gwan-gyeong Mun <gwan-gyeong.mun@intel.com>
---
 .../drm/i915/display/intel_display_types.h    |   1 +
 drivers/gpu/drm/i915/display/intel_psr.c      | 117 +++++++++++++++---
 drivers/gpu/drm/i915/display/intel_psr.h      |   2 +
 3 files changed, 100 insertions(+), 20 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
index 45c6388fa605..e29ffa8e8051 100644
--- a/drivers/gpu/drm/i915/display/intel_display_types.h
+++ b/drivers/gpu/drm/i915/display/intel_display_types.h
@@ -1455,6 +1455,7 @@ struct intel_psr {
 	u16 su_x_granularity;
 	u32 dc3co_exitline;
 	u32 dc3co_exit_delay;
+	bool paused;
 	struct delayed_work dc3co_work;
 	struct drm_dp_vsc_sdp vsc;
 };
diff --git a/drivers/gpu/drm/i915/display/intel_psr.c b/drivers/gpu/drm/i915/display/intel_psr.c
index ce7ce82d6f1b..d90c0d769f26 100644
--- a/drivers/gpu/drm/i915/display/intel_psr.c
+++ b/drivers/gpu/drm/i915/display/intel_psr.c
@@ -957,27 +957,11 @@ static void intel_psr_enable_source(struct intel_dp *intel_dp)
 			     IGNORE_PSR2_HW_TRACKING : 0);
 }
 
-static void intel_psr_enable_locked(struct intel_dp *intel_dp,
-				    const struct intel_crtc_state *crtc_state,
-				    const struct drm_connector_state *conn_state)
+static bool psr_interrupt_error_check(struct intel_dp *intel_dp)
 {
-	struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
 	struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
-	struct intel_encoder *encoder = &dig_port->base;
 	u32 val;
 
-	drm_WARN_ON(&dev_priv->drm, intel_dp->psr.enabled);
-
-	intel_dp->psr.psr2_enabled = crtc_state->has_psr2;
-	intel_dp->psr.busy_frontbuffer_bits = 0;
-	intel_dp->psr.pipe = to_intel_crtc(crtc_state->uapi.crtc)->pipe;
-	intel_dp->psr.transcoder = crtc_state->cpu_transcoder;
-	/* DC5/DC6 requires at least 6 idle frames */
-	val = usecs_to_jiffies(intel_get_frame_time_us(crtc_state) * 6);
-	intel_dp->psr.dc3co_exit_delay = val;
-	intel_dp->psr.dc3co_exitline = crtc_state->dc3co_exitline;
-	intel_dp->psr.psr2_sel_fetch_enabled = crtc_state->enable_psr2_sel_fetch;
-
 	/*
 	 * If a PSR error happened and the driver is reloaded, the EDP_PSR_IIR
 	 * will still keep the error set even after the reset done in the
@@ -998,13 +982,26 @@ static void intel_psr_enable_locked(struct intel_dp *intel_dp,
 		intel_dp->psr.sink_not_reliable = true;
 		drm_dbg_kms(&dev_priv->drm,
 			    "PSR interruption error set, not enabling PSR\n");
-		return;
+		return false;
 	}
 
+	return true;
+}
+
+static void _intel_psr_enable_locked(struct intel_dp *intel_dp)
+{
+	struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
+	struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
+	struct intel_encoder *encoder = &dig_port->base;
+	const struct intel_crtc_state *crtc_state =
+		to_intel_crtc_state(encoder->base.crtc->state);
+
+	if (!psr_interrupt_error_check(intel_dp))
+		return;
+
 	drm_dbg_kms(&dev_priv->drm, "Enabling PSR%s\n",
 		    intel_dp->psr.psr2_enabled ? "2" : "1");
-	intel_dp_compute_psr_vsc_sdp(intel_dp, crtc_state, conn_state,
-				     &intel_dp->psr.vsc);
+
 	intel_write_dp_vsc_sdp(encoder, crtc_state, &intel_dp->psr.vsc);
 	intel_psr_enable_sink(intel_dp);
 	intel_psr_enable_source(intel_dp);
@@ -1013,6 +1010,32 @@ static void intel_psr_enable_locked(struct intel_dp *intel_dp,
 	intel_psr_activate(intel_dp);
 }
 
+static void intel_psr_enable_locked(struct intel_dp *intel_dp,
+				    const struct intel_crtc_state *crtc_state,
+				    const struct drm_connector_state *conn_state)
+{
+	struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
+	u32 val;
+
+	drm_WARN_ON(&dev_priv->drm, intel_dp->psr.enabled);
+
+	intel_dp->psr.psr2_enabled = crtc_state->has_psr2;
+	intel_dp->psr.busy_frontbuffer_bits = 0;
+	intel_dp->psr.pipe = to_intel_crtc(crtc_state->uapi.crtc)->pipe;
+	intel_dp->psr.transcoder = crtc_state->cpu_transcoder;
+	/* DC5/DC6 requires at least 6 idle frames */
+	val = usecs_to_jiffies(intel_get_frame_time_us(crtc_state) * 6);
+	intel_dp->psr.dc3co_exit_delay = val;
+	intel_dp->psr.psr2_sel_fetch_enabled = crtc_state->enable_psr2_sel_fetch;
+	intel_dp->psr.dc3co_exitline = crtc_state->dc3co_exitline;
+	intel_dp->psr.paused = false;
+
+	intel_dp_compute_psr_vsc_sdp(intel_dp, crtc_state, conn_state,
+				     &intel_dp->psr.vsc);
+
+	_intel_psr_enable_locked(intel_dp);
+}
+
 /**
  * intel_psr_enable - Enable PSR
  * @intel_dp: Intel DP
@@ -1150,6 +1173,60 @@ void intel_psr_disable(struct intel_dp *intel_dp,
 	cancel_delayed_work_sync(&intel_dp->psr.dc3co_work);
 }
 
+/**
+ * intel_psr_pause - Pause PSR
+ * @intel_dp: Intel DP
+ *
+ * This function need to be called after enabling psr.
+ */
+void intel_psr_pause(struct intel_dp *intel_dp)
+{
+	struct intel_psr *psr = &intel_dp->psr;
+
+	if (!CAN_PSR(intel_dp))
+		return;
+
+	mutex_lock(&psr->lock);
+
+	if (!psr->enabled || psr->paused) {
+		mutex_unlock(&psr->lock);
+		return;
+	}
+
+	intel_psr_disable_locked(intel_dp);
+	psr->paused = true;
+
+	mutex_unlock(&psr->lock);
+
+	cancel_work_sync(&psr->work);
+	cancel_delayed_work_sync(&psr->dc3co_work);
+}
+
+/**
+ * intel_psr_resume - Resume PSR
+ * @intel_dp: Intel DP
+ *
+ * This function need to be called after pausing psr.
+ */
+void intel_psr_resume(struct intel_dp *intel_dp)
+{
+	struct intel_psr *psr = &intel_dp->psr;
+
+	if (!CAN_PSR(intel_dp))
+		return;
+
+	mutex_lock(&psr->lock);
+
+	if (psr->enabled || !psr->paused)
+		goto unlock;
+
+	psr->paused = false;
+	_intel_psr_enable_locked(intel_dp);
+
+unlock:
+	mutex_unlock(&psr->lock);
+}
+
 static void psr_force_hw_tracking_exit(struct intel_dp *intel_dp)
 {
 	struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
diff --git a/drivers/gpu/drm/i915/display/intel_psr.h b/drivers/gpu/drm/i915/display/intel_psr.h
index 0491a49ffd50..8cc5e78fb1d2 100644
--- a/drivers/gpu/drm/i915/display/intel_psr.h
+++ b/drivers/gpu/drm/i915/display/intel_psr.h
@@ -48,5 +48,7 @@ void intel_psr2_program_plane_sel_fetch(struct intel_plane *plane,
 					const struct intel_crtc_state *crtc_state,
 					const struct intel_plane_state *plane_state,
 					int color_plane);
+void intel_psr_pause(struct intel_dp *intel_dp);
+void intel_psr_resume(struct intel_dp *intel_dp);
 
 #endif /* __INTEL_PSR_H__ */
-- 
2.30.1

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