Set the KCR init during the boot time, which is
required by hardware, to allow us doing further
protection operation such as sending commands to
GPU or TEE.
rev21:
- Remove "#define KCR_INIT_MASK_SHIFT (16)", but still keep the
macro in this .c file
- Write KCR_INIT reg inly for gen12 during boot, not required
for gen13+
Signed-off-by: Huang, Sean Z <[email protected]>
---
drivers/gpu/drm/i915/pxp/intel_pxp.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp.c
b/drivers/gpu/drm/i915/pxp/intel_pxp.c
index 9bc3c7e30654..4e9cee7df4f2 100644
--- a/drivers/gpu/drm/i915/pxp/intel_pxp.c
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp.c
@@ -6,6 +6,12 @@
#include "intel_pxp.h"
#include "intel_pxp_context.h"
+/* KCR register definitions */
+#define KCR_INIT _MMIO(0x320f0)
+
+/* Setting KCR Init bit is required after system boot */
+#define KCR_INIT_ALLOW_DISPLAY_ME_WRITES (BIT(14) | (BIT(14) << 16))
+
void intel_pxp_init(struct intel_pxp *pxp)
{
struct intel_gt *gt = container_of(pxp, struct intel_gt, pxp);
@@ -15,6 +21,9 @@ void intel_pxp_init(struct intel_pxp *pxp)
intel_pxp_ctx_init(&pxp->ctx);
+ if (INTEL_GEN(gt->i915) == 12)
+ intel_uncore_write(gt->uncore, KCR_INIT,
KCR_INIT_ALLOW_DISPLAY_ME_WRITES);
+
drm_info(>->i915->drm, "Protected Xe Path (PXP) protected content
support initialized\n");
}
--
2.17.1
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