Commit 336ba968 authored by David E. Box's avatar David E. Box Committed by Hans de Goede
Browse files

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: default avatarDavid E. Box <david.e.box@linux.intel.com>
Reviewed-by: default avatarHans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20230409192535.914540-1-david.e.box@linux.intel.com


Signed-off-by: default avatarHans de Goede <hdegoede@redhat.com>
parent 8d99129e

drivers/platform/x86/intel/pmc/mtl.c

+31 −0
Original line number Diff line number Diff line
@@ -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);

}