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From:   "David E. Box" <david.e.box@linux.intel.com>
To:     srinivas.pandruvada@linux.intel.com, irenic.rajneesh@gmail.com,
        david.e.box@intel.com, hdegoede@redhat.com, markgross@kernel.org,
        rjw@rjwysocki.net
Cc:     platform-driver-x86@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH] platform/x86/intel/pmc/mtl: Put GNA/IPU/VPU devices in D3
Date:   Fri,  7 Apr 2023 19:26:29 -0700
Message-Id: <20230408022629.727721-1-david.e.box@linux.intel.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

On Meteor Lake, the GNA, IPU, and VPU devices are booted in D0 power state
and will block the SoC from going into the deepest Package C-state if a
driver is not present. Put each device in D3hot if no driver is found.

Signed-off-by: David E. Box <david.e.box@linux.intel.com>
---
 drivers/platform/x86/intel/pmc/mtl.c | 31 ++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/drivers/platform/x86/intel/pmc/mtl.c b/drivers/platform/x86/intel/pmc/mtl.c
index eeb3bd8c2502..33aa98b54049 100644
--- a/drivers/platform/x86/intel/pmc/mtl.c
+++ b/drivers/platform/x86/intel/pmc/mtl.c
@@ -8,6 +8,7 @@
  *
  */
 
+#include <linux/pci.h>
 #include "core.h"
 
 const struct pmc_reg_map mtl_reg_map = {
@@ -45,8 +46,38 @@ void mtl_core_configure(struct pmc_dev *pmcdev)
 	pmc_core_send_ltr_ignore(pmcdev, 3);
 }
 
+#define MTL_GNA_PCI_DEV	0x7e4c
+#define MTL_IPU_PCI_DEV	0x7d19
+#define MTL_VPU_PCI_DEV	0x7d1d
+void mtl_set_device_d3(unsigned int device)
+{
+	struct pci_dev *pcidev;
+
+	pcidev = pci_get_device(PCI_VENDOR_ID_INTEL, device, NULL);
+	if (pcidev) {
+		if (!device_trylock(&pcidev->dev)) {
+			pci_dev_put(pcidev);
+			return;
+		}
+		if (!pcidev->dev.driver) {
+			dev_info(&pcidev->dev, "Setting to D3hot\n");
+			pci_set_power_state(pcidev, PCI_D3hot);
+		}
+		device_unlock(&pcidev->dev);
+		pci_dev_put(pcidev);
+	}
+}
+
 void mtl_core_init(struct pmc_dev *pmcdev)
 {
 	pmcdev->map = &mtl_reg_map;
 	pmcdev->core_configure = mtl_core_configure;
+
+	/*
+	 * Set power state of select devices that do not have drivers to D3
+	 * so that they do not block Package C entry.
+	 */
+	mtl_set_device_d3(MTL_GNA_PCI_DEV);
+	mtl_set_device_d3(MTL_IPU_PCI_DEV);
+	mtl_set_device_d3(MTL_VPU_PCI_DEV);
 }

base-commit: 4f59630a5ed0a4e7d275bd7e5d253a8f5a425c5a
-- 
2.34.1