linux-kernel - Re: [PATCH] platform/x86/intel/pmc/mtl: Put GNA/IPU/VPU devices in D3

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Message-ID: <f7a20a10-3871-8b2d-251f-35b0136d684d@redhat.com>
Date:   Sat, 8 Apr 2023 10:57:53 +0200
From:   Hans de Goede <hdegoede@...hat.com>
To:     "David E. Box" <david.e.box@...ux.intel.com>,
        srinivas.pandruvada@...ux.intel.com, irenic.rajneesh@...il.com,
        david.e.box@...el.com, markgross@...nel.org, rjw@...ysocki.net
Cc:     platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] platform/x86/intel/pmc/mtl: Put GNA/IPU/VPU devices in D3

Hi David,

On 4/8/23 04:26, David E. Box wrote:
> 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@...ux.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)

As pointed out by "kernel test robot <lkp@...el.com>" this needs to
be static. Otherwise this LGTM. With this fixed please add my:

Reviewed-by: Hans de Goede <hdegoede@...hat.com>

to version 2 of the patch.

Regards,

Hans




> +{
> +	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