Re: [PATCH 1/2] usb: host: add XHCI_CDNS_HOST flag

[Mathias Nyman <mathias.nyman@linux.intel.com>]

On 22.10.2020 6.01, Peter Chen wrote:
> The Cadence xHCI host has the same issue with Intel's,
> it is triggered by reboot stress test.
> 
> Cc: Pawel Laszczak <pawell@cadence.com>
> Cc: Roger Quadros <rogerq@ti.com>
> Signed-off-by: Peter Chen <peter.chen@nxp.com>
> ---
>  drivers/usb/host/xhci.c | 2 +-
>  drivers/usb/host/xhci.h | 1 +
>  2 files changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
> index 482fe8c5e3b4..fc72a03dc27f 100644
> --- a/drivers/usb/host/xhci.c
> +++ b/drivers/usb/host/xhci.c
> @@ -193,7 +193,7 @@ int xhci_reset(struct xhci_hcd *xhci)
>  	 * Without this delay, the subsequent HC register access,
>  	 * may result in a system hang very rarely.
>  	 */
> -	if (xhci->quirks & XHCI_INTEL_HOST)
> +	if (xhci->quirks & (XHCI_INTEL_HOST | XHCI_CDNS_HOST))
>  		udelay(1000);
>  
>  	ret = xhci_handshake(&xhci->op_regs->command,
> diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
> index 8be88379c0fb..4b7275c73ea5 100644
> --- a/drivers/usb/host/xhci.h
> +++ b/drivers/usb/host/xhci.h
> @@ -1877,6 +1877,7 @@ struct xhci_hcd {
>  #define XHCI_SNPS_BROKEN_SUSPEND    BIT_ULL(35)
>  #define XHCI_RENESAS_FW_QUIRK	BIT_ULL(36)
>  #define XHCI_SKIP_PHY_INIT	BIT_ULL(37)
> +#define XHCI_CDNS_HOST		BIT_ULL(38)
>  
>  	unsigned int		num_active_eps;
>  	unsigned int		limit_active_eps;
> 

Is the XHCI_CDNS_HOST quirk bit set in some other patchseries?

-Mathias