drm/i915/mtl: Disable MC6 for MTL A step

The Wa_14017073508 require to send Media Busy/Idle mailbox while
accessing Media tile. As of now it is getting handled while __gt_unpark,
__gt_park. But there are various corner cases where forcewakes are taken
without __gt_unpark i.e. without sending Busy Mailbox especially during
register reads. Forcewakes are taken without busy mailbox leads to
GPU HANG. So bringing mailbox calls under forcewake calls are no feasible
option as forcewake calls are atomic and mailbox calls are blocking.
The issue already fixed in B step so disabling MC6 on A step and
reverting previous commit which handles Wa_14017073508

Fixes: 8f70f1ec587d ("drm/i915/mtl: Add Wa_14017073508 for SAMedia")
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
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/20230310061339.2495416-2-badal.nilawar@intel.com
(cherry picked from commit 038a24835ab68f341eaa7a0e3bcc6ce0f9b22e17)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>

diff --git a/drivers/gpu/drm/i915/gt/intel_gt_pm.c b/drivers/gpu/drm/i915/gt/intel_gt_pm.c
index cef3d6f..56b993f 100644 (file)
--- a/drivers/gpu/drm/i915/gt/intel_gt_pm.c
+++ b/drivers/gpu/drm/i915/gt/intel_gt_pm.c
@@ -21,31 +21,10 @@
 #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);
@@ -93,9 +72,6 @@ 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
@@ -145,9 +121,6 @@ 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;
 }
 

diff --git a/drivers/gpu/drm/i915/gt/intel_rc6.c b/drivers/gpu/drm/i915/gt/intel_rc6.c
index 5c91622..f4150f6 100644 (file)
--- a/drivers/gpu/drm/i915/gt/intel_rc6.c
+++ b/drivers/gpu/drm/i915/gt/intel_rc6.c
@@ -486,6 +486,7 @@ static bool bxt_check_bios_rc6_setup(struct intel_rc6 *rc6)
 static bool rc6_supported(struct intel_rc6 *rc6)
 {
        struct drm_i915_private *i915 = rc6_to_i915(rc6);
+       struct intel_gt *gt = rc6_to_gt(rc6);
 
        if (!HAS_RC6(i915))
                return false;
@@ -502,6 +503,13 @@ static bool rc6_supported(struct intel_rc6 *rc6)
                return false;
        }
 
+       if (IS_MTL_MEDIA_STEP(gt->i915, STEP_A0, STEP_B0) &&
+           gt->type == GT_MEDIA) {
+               drm_notice(&i915->drm,
+                          "Media RC6 disabled on A step\n");
+               return false;
+       }
+
        return true;
 }
 

diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_rc.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_rc.c
index b585509..8f8dd05 100644 (file)
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_rc.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_rc.c
@@ -11,20 +11,9 @@
 
 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(gt->i915) >= 12;
+               GRAPHICS_VER(guc_to_gt(guc)->i915) >= 12;
 }
 
 static bool __guc_rc_selected(struct intel_guc *guc)

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 19b0478..747b53b 100644 (file)
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -6598,15 +6598,6 @@
 /*   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