[Intel-gfx] [PATCH v2 05/16] drm/i915/pxp: set KCR reg init during the boot time

[Daniele Ceraolo Spurio]

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.

Signed-off-by: Huang, Sean Z <sean.z.hu...@intel.com>
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospu...@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.v...@intel.com>
---
 drivers/gpu/drm/i915/pxp/intel_pxp.c | 29 +++++++++++++++++++++++++++-
 1 file changed, 28 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp.c 
b/drivers/gpu/drm/i915/pxp/intel_pxp.c
index c2b1c8ff845d..9b2a67f8ab8e 100644
--- a/drivers/gpu/drm/i915/pxp/intel_pxp.c
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp.c
@@ -6,6 +6,24 @@
 #include "gt/intel_context.h"
 #include "i915_drv.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 REG_BIT(14)
+
+static void kcr_pxp_enable(struct intel_gt *gt)
+{
+       intel_uncore_write(gt->uncore, KCR_INIT,
+                          
_MASKED_BIT_ENABLE(KCR_INIT_ALLOW_DISPLAY_ME_WRITES));
+}
+
+static void kcr_pxp_disable(struct intel_gt *gt)
+{
+       intel_uncore_write(gt->uncore, KCR_INIT,
+                          
_MASKED_BIT_DISABLE(KCR_INIT_ALLOW_DISPLAY_ME_WRITES));
+}
+
 static int create_vcs_context(struct intel_pxp *pxp)
 {
        static struct lock_class_key pxp_lock;
@@ -46,19 +64,28 @@ void intel_pxp_init(struct intel_pxp *pxp)
        if (!HAS_PXP(gt->i915))
                return;
 
+       kcr_pxp_enable(gt);
+
        ret = create_vcs_context(pxp);
        if (ret)
-               return;
+               goto out_kcr;
 
        drm_info(&gt->i915->drm, "Protected Xe Path (PXP) protected content 
support initialized\n");
 
        return;
+
+out_kcr:
+       kcr_pxp_disable(gt);
 }
 
 void intel_pxp_fini(struct intel_pxp *pxp)
 {
+       struct intel_gt *gt = pxp_to_gt(pxp);
+
        if (!intel_pxp_is_enabled(pxp))
                return;
 
        destroy_vcs_context(pxp);
+
+       kcr_pxp_disable(gt);
 }
-- 
2.29.2

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