[PATCH] drm/i915/display: Implement wa_14024400148

[Nemesa Garg]

Signed-off-by: Nemesa Garg <nemesa.garg at intel.com>
---
 drivers/gpu/drm/i915/display/intel_pmdemand.c | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_pmdemand.c b/drivers/gpu/drm/i915/display/intel_pmdemand.c
index d22b5469672d..f8fa844a5309 100644
--- a/drivers/gpu/drm/i915/display/intel_pmdemand.c
+++ b/drivers/gpu/drm/i915/display/intel_pmdemand.c
@@ -478,6 +478,15 @@ static bool intel_pmdemand_req_complete(struct intel_display *display)
 		 XELPDP_PMDEMAND_REQ_ENABLE);
 }
 
+/* Wa_14024400148 */
+static void intel_pmdemand_poll(struct intel_display *display)
+{
+	if (intel_de_wait_for_clear(display,XELPDP_INITIATE_PMDEMAND_REQUEST(1),
+                                XELPDP_PMDEMAND_REQ_ENABLE, 5/100))
+		drm_err(display->drm,
+			"timed out waiting for Punit PM Demand Response\n");
+}
+
 static void intel_pmdemand_wait(struct intel_display *display)
 {
 	if (!wait_event_timeout(display->pmdemand.waitqueue,
@@ -508,7 +517,10 @@ void intel_pmdemand_program_dbuf(struct intel_display *display,
 	intel_de_rmw(display, XELPDP_INITIATE_PMDEMAND_REQUEST(1), 0,
 		     XELPDP_PMDEMAND_REQ_ENABLE);
 
-	intel_pmdemand_wait(display);
+	if (DISPLAY_VER(display) == 20)
+		intel_pmdemand_poll(display);
+	else
+		intel_pmdemand_wait(display);
 
 unlock:
 	mutex_unlock(&display->pmdemand.lock);
@@ -617,7 +629,10 @@ intel_pmdemand_program_params(struct intel_display *display,
 	intel_de_rmw(display, XELPDP_INITIATE_PMDEMAND_REQUEST(1), 0,
 		     XELPDP_PMDEMAND_REQ_ENABLE);
 
-	intel_pmdemand_wait(display);
+	if (DISPLAY_VER(display) == 20)
+		intel_pmdemand_poll(display);
+	else
+		intel_pmdemand_wait(display);
 
 unlock:
 	mutex_unlock(&display->pmdemand.lock);
-- 
2.25.1