[PATCH v3 07/20] drm/i915/psr: Do not write registers/bits not applicable for panel replay

[Jouni Högander]

>From bspec:

Additional programming considerations (repurposed eDP registers)

mask register: Only PSR_MASK[Mask FBC modify] and PSR_MASK[Mask Hotplug]
are used in panel replay mode.

Status register: Only SRD_STATUS[SRD state] field is used in panel replay
mode.

Due to this stop writing and reading registers and bits not used by panel
replay if panel replay is used.

Bspec: 53370

Signed-off-by: Jouni Högander <jouni.hogander at intel.com>
---
 drivers/gpu/drm/i915/display/intel_psr.c | 23 ++++++++++++++++++-----
 1 file changed, 18 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_psr.c b/drivers/gpu/drm/i915/display/intel_psr.c
index ed0406d1aaed..c7fbbf71b8a3 100644
--- a/drivers/gpu/drm/i915/display/intel_psr.c
+++ b/drivers/gpu/drm/i915/display/intel_psr.c
@@ -346,6 +346,9 @@ static void psr_irq_control(struct intel_dp *intel_dp)
 	enum transcoder cpu_transcoder = intel_dp->psr.transcoder;
 	u32 mask;
 
+	if (intel_dp->psr.panel_replay_enabled)
+		return;
+
 	mask = psr_irq_psr_error_bit_get(intel_dp);
 	if (intel_dp->psr.debug & I915_PSR_DEBUG_IRQ)
 		mask |= psr_irq_post_exit_bit_get(intel_dp) |
@@ -1558,13 +1561,19 @@ static void intel_psr_enable_source(struct intel_dp *intel_dp,
 	 * mask LPSP to avoid dependency on other drivers that might block
 	 * runtime_pm besides preventing  other hw tracking issues now we
 	 * can rely on frontbuffer tracking.
+	 *
+	 * From bspec: Only PSR_MASK[Mask FBC modify] and PSR_MASK[Mask Hotplug]
+	 * are used in panel replay mode.
 	 */
-	mask = EDP_PSR_DEBUG_MASK_MEMUP |
-	       EDP_PSR_DEBUG_MASK_HPD |
-	       EDP_PSR_DEBUG_MASK_LPSP;
+	mask = EDP_PSR_DEBUG_MASK_HPD;
 
-	if (DISPLAY_VER(dev_priv) < 20)
-		mask |= EDP_PSR_DEBUG_MASK_MAX_SLEEP;
+	if (!intel_dp->psr.panel_replay_enabled) {
+		mask |= EDP_PSR_DEBUG_MASK_MEMUP |
+			EDP_PSR_DEBUG_MASK_LPSP;
+
+		if (DISPLAY_VER(dev_priv) < 20)
+			mask |= EDP_PSR_DEBUG_MASK_MAX_SLEEP;
+	}
 
 	/*
 	 * No separate pipe reg write mask on hsw/bdw, so have to unmask all
@@ -1633,6 +1642,9 @@ static bool psr_interrupt_error_check(struct intel_dp *intel_dp)
 	enum transcoder cpu_transcoder = intel_dp->psr.transcoder;
 	u32 val;
 
+	if (intel_dp->psr.panel_replay_enabled)
+		goto no_err;
+
 	/*
 	 * 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
@@ -1650,6 +1662,7 @@ static bool psr_interrupt_error_check(struct intel_dp *intel_dp)
 		return false;
 	}
 
+no_err:
 	return true;
 }
 
-- 
2.34.1