[Intel-gfx] [RFC-v23 02/13] drm/i915/pxp: set KCR reg init during the boot time

[Huang, Sean Z]

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 <sean.z.huang at intel.com>
---
 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(&gt->i915->drm, "Protected Xe Path (PXP) protected content support initialized\n");
 }
 
-- 
2.17.1