platform/x86/intel/pmc/mtl: Put GNA/IPU/VPU devices in D3

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>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20230409192535.914540-1-david.e.box@linux.intel.com
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

diff --git a/drivers/platform/x86/intel/pmc/mtl.c b/drivers/platform/x86/intel/pmc/mtl.c
index eeb3bd8c2502d2316a4dbd9d4add2a7bfdeab02f..e8cc156412ce56a758d9f2e14cb87a68138b276e 100644 (file)
--- 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
+static 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);
 }