[Intel-gfx] [PATCH] drm/i915: Add intel_pcode_probe

[Sujaritha Sundaresan]

Added intel_pcode_probe, promoted wait for lmem init and
intel_pcode_init prior to mmio_probe during load,
so that GT registers can be accessed only after this, else MCA
is observed.

Signed-off-by: Sujaritha Sundaresan <sujaritha.sundaresan at intel.com>
---
 drivers/gpu/drm/i915/i915_driver.c  | 37 ++++++++++++++++++++++++-----
 drivers/gpu/drm/i915/intel_uncore.c | 12 ----------
 2 files changed, 31 insertions(+), 18 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_driver.c b/drivers/gpu/drm/i915/i915_driver.c
index f8dbee7a5af7..92cafceaf447 100644
--- a/drivers/gpu/drm/i915/i915_driver.c
+++ b/drivers/gpu/drm/i915/i915_driver.c
@@ -93,6 +93,7 @@
 #include "i915_memcpy.h"
 #include "i915_perf.h"
 #include "i915_query.h"
+#include "i915_reg.h"
 #include "i915_suspend.h"
 #include "i915_switcheroo.h"
 #include "i915_sysfs.h"
@@ -436,6 +437,32 @@ static int i915_pcode_init(struct drm_i915_private *i915)
 	return 0;
 }
 
+static int intel_pcode_probe(struct drm_i915_private *i915)
+{
+	struct intel_uncore *uncore;
+	int ret;
+
+	/*
+	 * The boot firmware initializes local memory and assesses its health.
+	 * If memory training fails, the punit will have been instructed to
+	 * keep the GT powered down; we won't be able to communicate with it
+	 * and we should not continue with driver initialization.
+	 */
+	if (IS_DGFX(i915) &&
+		!(__raw_uncore_read32(uncore, GU_CNTL) & LMEM_INIT)) {
+		drm_err(&i915->drm, "LMEM not initialized by firmware\n");
+		return -ENODEV;
+	}
+
+	/*
+	 * Driver handshakes with pcode via mailbox command to know that SoC
+	 * initialization is complete before proceeding further
+	 */
+	ret = i915_pcode_init(i915);
+
+	return ret;
+}
+
 /**
  * i915_driver_hw_probe - setup state requiring device access
  * @dev_priv: device private
@@ -547,10 +574,6 @@ static int i915_driver_hw_probe(struct drm_i915_private *dev_priv)
 
 	intel_opregion_setup(dev_priv);
 
-	ret = i915_pcode_init(dev_priv);
-	if (ret)
-		goto err_opregion;
-
 	/*
 	 * Fill the dram structure to get the system dram info. This will be
 	 * used for memory latency calculation.
@@ -561,8 +584,6 @@ static int i915_driver_hw_probe(struct drm_i915_private *dev_priv)
 
 	return 0;
 
-err_opregion:
-	intel_opregion_cleanup(dev_priv);
 err_msi:
 	if (pdev->msi_enabled)
 		pci_disable_msi(pdev);
@@ -778,6 +799,10 @@ int i915_driver_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	if (ret < 0)
 		goto out_runtime_pm_put;
 
+	ret = intel_pcode_probe(i915);
+	if (ret)
+		goto out_tiles_cleanup;
+
 	ret = i915_driver_mmio_probe(i915);
 	if (ret < 0)
 		goto out_tiles_cleanup;
diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c
index dfefad5a5fec..4a353d4adf86 100644
--- a/drivers/gpu/drm/i915/intel_uncore.c
+++ b/drivers/gpu/drm/i915/intel_uncore.c
@@ -2658,18 +2658,6 @@ int intel_uncore_init_mmio(struct intel_uncore *uncore)
 	if (ret)
 		return ret;
 
-	/*
-	 * The boot firmware initializes local memory and assesses its health.
-	 * If memory training fails, the punit will have been instructed to
-	 * keep the GT powered down; we won't be able to communicate with it
-	 * and we should not continue with driver initialization.
-	 */
-	if (IS_DGFX(i915) &&
-	    !(__raw_uncore_read32(uncore, GU_CNTL) & LMEM_INIT)) {
-		drm_err(&i915->drm, "LMEM not initialized by firmware\n");
-		return -ENODEV;
-	}
-
 	if (GRAPHICS_VER(i915) > 5 && !intel_vgpu_active(i915))
 		uncore->flags |= UNCORE_HAS_FORCEWAKE;
 
-- 
2.41.0