[PATCH v3 06/13] drm/i915/psr: Block PKG C-State when enabling PSR

[Jouni Högander]

Block PKG C-State when enabling PSR when enabling PSR as described in
workaround for underrun on idle PSR HW issue (Wa_16025596647).

v2: use intel_dmc_block_pkgc instead of directly writing dmc register

Bspec: 74151
Signed-off-by: Jouni Högander <jouni.hogander at intel.com>
---
 drivers/gpu/drm/i915/display/intel_psr.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_psr.c b/drivers/gpu/drm/i915/display/intel_psr.c
index 20d53292c3b3..44adee087350 100644
--- a/drivers/gpu/drm/i915/display/intel_psr.c
+++ b/drivers/gpu/drm/i915/display/intel_psr.c
@@ -38,6 +38,7 @@
 #include "intel_display_irq.h"
 #include "intel_display_rpm.h"
 #include "intel_display_types.h"
+#include "intel_dmc.h"
 #include "intel_dp.h"
 #include "intel_dp_aux.h"
 #include "intel_frontbuffer.h"
@@ -1951,6 +1952,12 @@ static void intel_psr_enable_source(struct intel_dp *intel_dp,
 			intel_de_rmw(display, CLKGATE_DIS_MISC, 0,
 				     CLKGATE_DIS_MISC_DMASC_GATING_DIS);
 	}
+
+	/* Wa_16025596647 */
+	if ((DISPLAY_VER(display) == 20 ||
+	     IS_DISPLAY_VERx100_STEP(display, 3000, STEP_A0, STEP_B0)) &&
+	    !intel_dp->psr.panel_replay_enabled)
+		intel_dmc_block_pkgc(display, intel_dp->psr.pipe, true);
 }
 
 static bool psr_interrupt_error_check(struct intel_dp *intel_dp)
@@ -2175,6 +2182,12 @@ static void intel_psr_disable_locked(struct intel_dp *intel_dp)
 					   DP_RECEIVER_ALPM_CONFIG, 0);
 	}
 
+	/* Wa_16025596647 */
+	if ((DISPLAY_VER(display) == 20 ||
+	     IS_DISPLAY_VERx100_STEP(display, 3000, STEP_A0, STEP_B0)) &&
+	    !intel_dp->psr.panel_replay_enabled)
+		intel_dmc_block_pkgc(display, intel_dp->psr.pipe, false);
+
 	intel_dp->psr.enabled = false;
 	intel_dp->psr.panel_replay_enabled = false;
 	intel_dp->psr.sel_update_enabled = false;
-- 
2.43.0