On Mon, Aug 12, 2019 at 03:24:52PM +0800, Rick Tseng wrote:
> From: Rick <rts...@nvidia.com>
>
> NVIDIA 3.1 xHCI card would lose power when moving power state into D3Cold.
> Thus we need to wait CNR bit to clear when xhci resmue as xhci init.
>
> Signed-off-by: Rick <rts...@nvidia.com>
We need a "full" name on the from and signed-off-by lines, please.
> ---
> drivers/usb/host/xhci-pci.c | 20 ++++++++++++++++++++
> 1 file changed, 20 insertions(+)
>
> diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
> index 1e0236e..857ad8a 100644
> --- a/drivers/usb/host/xhci-pci.c
> +++ b/drivers/usb/host/xhci-pci.c
> @@ -12,6 +12,7 @@
> #include <linux/slab.h>
> #include <linux/module.h>
> #include <linux/acpi.h>
> +#include <linux/iopoll.h>
>
> #include "xhci.h"
> #include "xhci-trace.h"
> @@ -455,6 +456,19 @@ static void xhci_pme_quirk(struct usb_hcd *hcd)
> readl(reg);
> }
>
> +static int xhci_poll_cnr(struct usb_hcd *hcd)
> +{
> + struct xhci_hcd *xhci = hcd_to_xhci(hcd);
> + void __iomem *reg = &xhci->op_regs->status;
> + u32 result;
> + int ret;
> +
> + ret = readl_poll_timeout_atomic(reg, result,
> + (result & STS_CNR) == 0,
> + 1, 100 * 1000);
> + return ret;
> +}
> +
> static int xhci_pci_suspend(struct usb_hcd *hcd, bool do_wakeup)
> {
> struct xhci_hcd *xhci = hcd_to_xhci(hcd);
> @@ -508,6 +522,12 @@ static int xhci_pci_resume(struct usb_hcd *hcd, bool
> hibernated)
> if (pdev->vendor == PCI_VENDOR_ID_INTEL)
> usb_enable_intel_xhci_ports(pdev);
>
> + if (pdev->vendor == PCI_VENDOR_ID_NVIDIA) {
So all devices of this vendor need that? Are you _sure_? Why not just
blacklist a single device?
thanks,
greg k-h
