Re: [PATCH 1/2] Revert "xhci: Enable RPM on controllers that support low-power states"

[Basavaraj Natikar <bnatikar@amd.com>]

On 12/4/2023 3:38 PM, Mathias Nyman wrote:
> This reverts commit a5d6264b638efeca35eff72177fd28d149e0764b.
>
> This patch was an attempt to solve issues seen when enabling runtime PM
> as default for all AMD 1.1 xHC hosts. see commit 4baf12181509
> ("xhci: Loosen RPM as default policy to cover for AMD xHC 1.1")

AFAK, only 4baf12181509 commit has regression on AMD xHc 1.1 below is not regression
patch and its unrelated to AMD xHC 1.1.

Only [PATCH 2/2] Revert "xhci: Loosen RPM as default policy to cover for AMD xHC 1.1"
alone in this series solves regression issues.

>
> This was not enough, regressions are still seen, so start from a clean
> slate and revert both of them.
>
> This patch went to stable and should be reverted from there as well
>
> Fixes: a5d6264b638e ("xhci: Enable RPM on controllers that support low-power states")
> Cc: stable@vger.kernel.org
> Cc: Mario Limonciello <mario.limonciello@amd.com>
> Cc: Basavaraj Natikar <Basavaraj.Natikar@amd.com>
> Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
> ---
>  drivers/usb/host/xhci-pci.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
>
> diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
> index 95ed9404f6f8..bde43cef8846 100644
> --- a/drivers/usb/host/xhci-pci.c
> +++ b/drivers/usb/host/xhci-pci.c
> @@ -695,9 +695,7 @@ static int xhci_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
>  	/* USB-2 and USB-3 roothubs initialized, allow runtime pm suspend */
>  	pm_runtime_put_noidle(&dev->dev);
>  
> -	if (pci_choose_state(dev, PMSG_SUSPEND) == PCI_D0)
> -		pm_runtime_forbid(&dev->dev);
> -	else if (xhci->quirks & XHCI_DEFAULT_PM_RUNTIME_ALLOW)
> +	if (xhci->quirks & XHCI_DEFAULT_PM_RUNTIME_ALLOW)
>  		pm_runtime_allow(&dev->dev);
>  
>  	dma_set_max_seg_size(&dev->dev, UINT_MAX);