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@xxxxxxxxxxxxxxx>
---
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
