drm/i915/mtl: Add Wa_14017073508 for SAMedia

This workaround is added for Media tile of MTL A step. It is to help
pcode workaround which handles the hardware issue seen during package C2/C3
transitions due to RC6 entry/exit transitions on Media tile. As a part of
workaround pcode expect kmd to send mailbox message "media busy" when
components of Media tile are in use and "media idle" otherwise.
As per workaround description gucrc need to be disabled so enabled
host based RC for Media tile.

v2:
 - Correct workaround id (Matt)
 - Fix review comments (Rodrigo)

Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Radhakrishna Sripada <radhakrishna.sripada@intel.com>
Cc: Vinay Belgaumkar <vinay.belgaumkar@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Badal Nilawar <badal.nilawar@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Anshuman Gupta <anshuman.gupta@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221103184559.2306481-1-badal.nilawar@intel.com

drivers/gpu/drm/i915/gt/intel_gt_pm.c

@@ -19,10 +19,31 @@
 #include "intel_rc6.h"
 #include "intel_rps.h"
 #include "intel_wakeref.h"
+#include "intel_pcode.h"
 #include "pxp/intel_pxp_pm.h"
 
 #define I915_GT_SUSPEND_IDLE_TIMEOUT (HZ / 2)
 
+static void mtl_media_busy(struct intel_gt *gt)
+{
+	/* Wa_14017073508: mtl */
+	if (IS_MTL_GRAPHICS_STEP(gt->i915, P, STEP_A0, STEP_B0) &&
+	    gt->type == GT_MEDIA)
+		snb_pcode_write_p(gt->uncore, PCODE_MBOX_GT_STATE,
+				  PCODE_MBOX_GT_STATE_MEDIA_BUSY,
+				  PCODE_MBOX_GT_STATE_DOMAIN_MEDIA, 0);
+}
+
+static void mtl_media_idle(struct intel_gt *gt)
+{
+	/* Wa_14017073508: mtl */
+	if (IS_MTL_GRAPHICS_STEP(gt->i915, P, STEP_A0, STEP_B0) &&
+	    gt->type == GT_MEDIA)
+		snb_pcode_write_p(gt->uncore, PCODE_MBOX_GT_STATE,
+				  PCODE_MBOX_GT_STATE_MEDIA_NOT_BUSY,
+				  PCODE_MBOX_GT_STATE_DOMAIN_MEDIA, 0);
+}
+
 static void user_forcewake(struct intel_gt *gt, bool suspend)
 {
 	int count = atomic_read(&gt->user_wakeref);
@@ -70,6 +91,9 @@ static int __gt_unpark(struct intel_wakeref *wf)
 
 	GT_TRACE(gt, "\n");
 
+	/* Wa_14017073508: mtl */
+	mtl_media_busy(gt);
+
 	/*
 	 * It seems that the DMC likes to transition between the DC states a lot
 	 * when there are no connected displays (no active power domains) during
@@ -119,6 +143,9 @@ static int __gt_park(struct intel_wakeref *wf)
 	GEM_BUG_ON(!wakeref);
 	intel_display_power_put_async(i915, POWER_DOMAIN_GT_IRQ, wakeref);
 
+	/* Wa_14017073508: mtl */
+	mtl_media_idle(gt);
+
 	return 0;
 }
 

drivers/gpu/drm/i915/gt/uc/intel_guc_rc.c

@@ -11,9 +11,20 @@
 
 static bool __guc_rc_supported(struct intel_guc *guc)
 {
+	struct intel_gt *gt = guc_to_gt(guc);
+
+	/*
+	 * Wa_14017073508: mtl
+	 * Do not enable gucrc to avoid additional interrupts which
+	 * may disrupt pcode wa.
+	 */
+	if (IS_MTL_GRAPHICS_STEP(gt->i915, P, STEP_A0, STEP_B0) &&
+	    gt->type == GT_MEDIA)
+		return false;
+
 	/* GuC RC is unavailable for pre-Gen12 */
 	return guc->submission_supported &&
-		GRAPHICS_VER(guc_to_gt(guc)->i915) >= 12;
+		GRAPHICS_VER(gt->i915) >= 12;
 }
 
 static bool __guc_rc_selected(struct intel_guc *guc)

drivers/gpu/drm/i915/i915_drv.h

@@ -740,6 +740,10 @@ IS_SUBPLATFORM(const struct drm_i915_private *i915,
 #define IS_XEHPSDV_GRAPHICS_STEP(__i915, since, until) \
 	(IS_XEHPSDV(__i915) && IS_GRAPHICS_STEP(__i915, since, until))
 
+#define IS_MTL_GRAPHICS_STEP(__i915, variant, since, until) \
+	(IS_SUBPLATFORM(__i915, INTEL_METEORLAKE, INTEL_SUBPLATFORM_##variant) && \
+	 IS_GRAPHICS_STEP(__i915, since, until))
+
 /*
  * DG2 hardware steppings are a bit unusual.  The hardware design was forked to
  * create three variants (G10, G11, and G12) which each have distinct

drivers/gpu/drm/i915/i915_reg.h

@@ -6679,6 +6679,15 @@
 /*   XEHP_PCODE_FREQUENCY_CONFIG param2 */
 #define     PCODE_MBOX_DOMAIN_NONE		0x0
 #define     PCODE_MBOX_DOMAIN_MEDIAFF		0x3
+
+/* Wa_14017210380: mtl */
+#define   PCODE_MBOX_GT_STATE			0x50
+/* sub-commands (param1) */
+#define     PCODE_MBOX_GT_STATE_MEDIA_BUSY	0x1
+#define     PCODE_MBOX_GT_STATE_MEDIA_NOT_BUSY	0x2
+/* param2 */
+#define     PCODE_MBOX_GT_STATE_DOMAIN_MEDIA	0x1
+
 #define GEN6_PCODE_DATA				_MMIO(0x138128)
 #define   GEN6_PCODE_FREQ_IA_RATIO_SHIFT	8
 #define   GEN6_PCODE_FREQ_RING_RATIO_SHIFT	16