[Intel-xe] [PATCH v2 1/2] drm/xe: add skip_pcode flag

[Koby Elbaz]

Per device, set this flag to enable access to the PCODE uC or to skip it.

Signed-off-by: Koby Elbaz <kelbaz at habana.ai>
---
Changes in v2:
- Added the flag 'skip_pcode' instead of 'has_pcode'

 drivers/gpu/drm/xe/xe_device_types.h | 2 ++
 drivers/gpu/drm/xe/xe_pci.c          | 2 ++
 drivers/gpu/drm/xe/xe_pcode.c        | 9 +++++++++
 3 files changed, 13 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_device_types.h b/drivers/gpu/drm/xe/xe_device_types.h
index 44d622d4cc3a..29199671d9e8 100644
--- a/drivers/gpu/drm/xe/xe_device_types.h
+++ b/drivers/gpu/drm/xe/xe_device_types.h
@@ -257,6 +257,8 @@ struct xe_device {
 		u8 enable_display:1;
 		/** @bypass_mtcfg: Bypass Multi-Tile configuration from MTCFG register */
 		u8 bypass_mtcfg:1;
+		/** @skip_pcode: skip access to PCODE uC */
+		u8 skip_pcode:1;
 		/** @supports_mmio_ext: supports MMIO extension/s */
 		u8 supports_mmio_ext:1;
 		/** @has_heci_gscfi: device has heci gscfi */
diff --git a/drivers/gpu/drm/xe/xe_pci.c b/drivers/gpu/drm/xe/xe_pci.c
index 2fae45b9d88e..05b0aa9f2ab7 100644
--- a/drivers/gpu/drm/xe/xe_pci.c
+++ b/drivers/gpu/drm/xe/xe_pci.c
@@ -61,6 +61,7 @@ struct xe_device_desc {
 
 	u8 has_llc:1;
 	u8 bypass_mtcfg:1;
+	u8 skip_pcode:1;
 	u8 supports_mmio_ext:1;
 };
 
@@ -578,6 +579,7 @@ static int xe_info_init(struct xe_device *xe,
 	xe->info.media_name = media_desc ? media_desc->name : "none";
 	xe->info.has_llc = desc->has_llc;
 	xe->info.bypass_mtcfg = desc->bypass_mtcfg;
+	xe->info.skip_pcode = desc->skip_pcode;
 	xe->info.supports_mmio_ext = desc->supports_mmio_ext;
 	xe->info.tile_mmio_ext_size = graphics_desc->tile_mmio_ext_size;
 
diff --git a/drivers/gpu/drm/xe/xe_pcode.c b/drivers/gpu/drm/xe/xe_pcode.c
index 4a240acf7625..b324dc2a5deb 100644
--- a/drivers/gpu/drm/xe/xe_pcode.c
+++ b/drivers/gpu/drm/xe/xe_pcode.c
@@ -61,6 +61,9 @@ static int pcode_mailbox_rw(struct xe_gt *gt, u32 mbox, u32 *data0, u32 *data1,
 {
 	int err;
 
+	if (gt_to_xe(gt)->info.skip_pcode)
+		return 0;
+
 	lockdep_assert_held(&gt->pcode.lock);
 
 	if ((xe_mmio_read32(gt, PCODE_MAILBOX) & PCODE_READY) != 0)
@@ -249,6 +252,9 @@ int xe_pcode_init(struct xe_gt *gt)
 	int timeout_us = 180000000; /* 3 min */
 	int ret;
 
+	if (gt_to_xe(gt)->info.skip_pcode)
+		return 0;
+
 	if (!IS_DGFX(gt_to_xe(gt)))
 		return 0;
 
@@ -280,6 +286,9 @@ int xe_pcode_probe(struct xe_gt *gt)
 {
 	drmm_mutex_init(&gt_to_xe(gt)->drm, &gt->pcode.lock);
 
+	if (gt_to_xe(gt)->info.skip_pcode)
+		return 0;
+
 	if (!IS_DGFX(gt_to_xe(gt)))
 		return 0;
 
-- 
2.34.1