[Intel-xe] [PATCH v4] drm/xe: remove gucrc disable from suspend path

[Riana Tauro]

Currently GuCRC is disabled in suspend path for xe.
Rc6 is a prerequiste to enable s0ix and
should not be disabled for s2idle. There is no requirement
to disable GuCRC for S3+.

Remove it from xe_guc_pc_stop, thus removing from suspend path.
Retain the call in other places where xe_guc_pc_stop is
called.

v2: add description and return statement to kernel-doc (Rodrigo)
v3: update commit message (Rodrigo)
v4: add mem_access_get to the gucrc disable function

Signed-off-by: Riana Tauro <riana.tauro at intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi at intel.com>
---
 drivers/gpu/drm/xe/xe_gt.c     |  1 +
 drivers/gpu/drm/xe/xe_guc_pc.c | 20 +++++++++++++-------
 drivers/gpu/drm/xe/xe_guc_pc.h |  1 +
 drivers/gpu/drm/xe/xe_uc.c     |  5 +++++
 drivers/gpu/drm/xe/xe_uc.h     |  1 +
 5 files changed, 21 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/xe/xe_gt.c b/drivers/gpu/drm/xe/xe_gt.c
index a21d44bfe9e8..b31ef2a8ff17 100644
--- a/drivers/gpu/drm/xe/xe_gt.c
+++ b/drivers/gpu/drm/xe/xe_gt.c
@@ -517,6 +517,7 @@ static int gt_reset(struct xe_gt *gt)
 	if (err)
 		goto err_msg;
 
+	xe_uc_gucrc_disable(&gt->uc);
 	xe_uc_stop_prepare(&gt->uc);
 	xe_gt_pagefault_reset(gt);
 
diff --git a/drivers/gpu/drm/xe/xe_guc_pc.c b/drivers/gpu/drm/xe/xe_guc_pc.c
index 3093cfeff0c2..03dfbde29fe5 100644
--- a/drivers/gpu/drm/xe/xe_guc_pc.c
+++ b/drivers/gpu/drm/xe/xe_guc_pc.c
@@ -730,12 +730,20 @@ static int pc_adjust_requested_freq(struct xe_guc_pc *pc)
 	return ret;
 }
 
-static int pc_gucrc_disable(struct xe_guc_pc *pc)
+/**
+ * xe_guc_pc_gucrc_disable - Disable GuC RC
+ * @pc: Xe_GuC_PC instance
+ *
+ * Disables GuC RC by taking control of RC6 back from GuC.
+ *
+ * Return: 0 on success, negative error code on error.
+ */
+int xe_guc_pc_gucrc_disable(struct xe_guc_pc *pc)
 {
 	struct xe_gt *gt = pc_to_gt(pc);
 	int ret;
 
-	xe_device_assert_mem_access(pc_to_xe(pc));
+	xe_device_mem_access_get(pc_to_xe(pc));
 
 	ret = pc_action_setup_gucrc(pc, XE_GUCRC_HOST_CONTROL);
 	if (ret)
@@ -750,6 +758,7 @@ static int pc_gucrc_disable(struct xe_guc_pc *pc)
 	xe_mmio_write32(gt, RC_STATE, 0);
 
 	XE_WARN_ON(xe_force_wake_put(gt_to_fw(gt), XE_FORCEWAKE_ALL));
+	xe_device_mem_access_put(pc_to_xe(pc));
 	return 0;
 }
 
@@ -827,7 +836,7 @@ int xe_guc_pc_start(struct xe_guc_pc *pc)
 		goto out;
 
 	if (xe->info.platform == XE_PVC) {
-		pc_gucrc_disable(pc);
+		xe_guc_pc_gucrc_disable(pc);
 		ret = 0;
 		goto out;
 	}
@@ -850,10 +859,6 @@ int xe_guc_pc_stop(struct xe_guc_pc *pc)
 
 	xe_device_mem_access_get(pc_to_xe(pc));
 
-	ret = pc_gucrc_disable(pc);
-	if (ret)
-		goto out;
-
 	mutex_lock(&pc->freq_lock);
 	pc->freq_ready = false;
 	mutex_unlock(&pc->freq_lock);
@@ -876,6 +881,7 @@ static void pc_fini(struct drm_device *drm, void *arg)
 {
 	struct xe_guc_pc *pc = arg;
 
+	XE_WARN_ON(xe_guc_pc_gucrc_disable(pc));
 	XE_WARN_ON(xe_guc_pc_stop(pc));
 	sysfs_remove_files(pc_to_gt(pc)->sysfs, pc_attrs);
 	xe_bo_unpin_map_no_vm(pc->bo);
diff --git a/drivers/gpu/drm/xe/xe_guc_pc.h b/drivers/gpu/drm/xe/xe_guc_pc.h
index 370353a40a17..81833a53b3c9 100644
--- a/drivers/gpu/drm/xe/xe_guc_pc.h
+++ b/drivers/gpu/drm/xe/xe_guc_pc.h
@@ -11,6 +11,7 @@
 int xe_guc_pc_init(struct xe_guc_pc *pc);
 int xe_guc_pc_start(struct xe_guc_pc *pc);
 int xe_guc_pc_stop(struct xe_guc_pc *pc);
+int xe_guc_pc_gucrc_disable(struct xe_guc_pc *pc);
 
 enum xe_gt_idle_state xe_guc_pc_c_status(struct xe_guc_pc *pc);
 u64 xe_guc_pc_rc6_residency(struct xe_guc_pc *pc);
diff --git a/drivers/gpu/drm/xe/xe_uc.c b/drivers/gpu/drm/xe/xe_uc.c
index 70eabf567156..f8cbd292d6d0 100644
--- a/drivers/gpu/drm/xe/xe_uc.c
+++ b/drivers/gpu/drm/xe/xe_uc.c
@@ -176,6 +176,11 @@ int xe_uc_reset_prepare(struct xe_uc *uc)
 	return xe_guc_reset_prepare(&uc->guc);
 }
 
+void xe_uc_gucrc_disable(struct xe_uc *uc)
+{
+	XE_WARN_ON(xe_guc_pc_gucrc_disable(&uc->guc.pc));
+}
+
 void xe_uc_stop_prepare(struct xe_uc *uc)
 {
 	xe_guc_stop_prepare(&uc->guc);
diff --git a/drivers/gpu/drm/xe/xe_uc.h b/drivers/gpu/drm/xe/xe_uc.h
index d6efc9ef00d3..42219b361df5 100644
--- a/drivers/gpu/drm/xe/xe_uc.h
+++ b/drivers/gpu/drm/xe/xe_uc.h
@@ -12,6 +12,7 @@ int xe_uc_init(struct xe_uc *uc);
 int xe_uc_init_hwconfig(struct xe_uc *uc);
 int xe_uc_init_post_hwconfig(struct xe_uc *uc);
 int xe_uc_init_hw(struct xe_uc *uc);
+void xe_uc_gucrc_disable(struct xe_uc *uc);
 int xe_uc_reset_prepare(struct xe_uc *uc);
 void xe_uc_stop_prepare(struct xe_uc *uc);
 int xe_uc_stop(struct xe_uc *uc);
-- 
2.40.0