[PATCH 2/4] drm/i915/psr: Add new define for PSR idle timeout

[Jouni Högander]

Currently we are using value 50ms as timeout for waiting PSR to idle. Add
own define for this purpose.

Signed-off-by: Jouni Högander <jouni.hogander at intel.com>
---
 drivers/gpu/drm/i915/display/intel_psr.c | 20 ++++++++++++--------
 1 file changed, 12 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_psr.c b/drivers/gpu/drm/i915/display/intel_psr.c
index c2ab00fe2c20..172bc0c39968 100644
--- a/drivers/gpu/drm/i915/display/intel_psr.c
+++ b/drivers/gpu/drm/i915/display/intel_psr.c
@@ -2982,6 +2982,14 @@ void intel_psr_post_plane_update(struct intel_atomic_state *state,
 	}
 }
 
+/*
+ * From bspec: Panel Self Refresh (BDW+)
+ * 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 ms is
+ * defensive enough to cover everything.
+ */
+#define PSR_IDLE_TIMEOUT_MS 50
+
 static int
 _psr2_ready_for_pipe_update_locked(const struct intel_crtc_state *new_crtc_state)
 {
@@ -2995,7 +3003,8 @@ _psr2_ready_for_pipe_update_locked(const struct intel_crtc_state *new_crtc_state
 	 */
 	return intel_de_wait_for_clear(display,
 				       EDP_PSR2_STATUS(display, cpu_transcoder),
-				       EDP_PSR2_STATUS_STATE_DEEP_SLEEP, 50);
+				       EDP_PSR2_STATUS_STATE_DEEP_SLEEP,
+				       PSR_IDLE_TIMEOUT_MS);
 }
 
 static int
@@ -3004,15 +3013,10 @@ _psr1_ready_for_pipe_update_locked(const struct intel_crtc_state *new_crtc_state
 	struct intel_display *display = to_intel_display(new_crtc_state);
 	enum transcoder cpu_transcoder = new_crtc_state->cpu_transcoder;
 
-	/*
-	 * From bspec: Panel Self Refresh (BDW+)
-	 * 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 ms is
-	 * defensive enough to cover everything.
-	 */
 	return intel_de_wait_for_clear(display,
 				       psr_status_reg(display, cpu_transcoder),
-				       EDP_PSR_STATUS_STATE_MASK, 50);
+				       EDP_PSR_STATUS_STATE_MASK,
+				       PSR_IDLE_TIMEOUT_MS);
 }
 
 /**
-- 
2.43.0