On Fri, 2020-06-12 at 19:13 +0200, Nicolas Saenz Julienne wrote:
> Some atypical users of xhci-pci might need to manually reset their xHCI
> controller before starting the HCD setup. Check if a reset controller
> device is available to the PCI bus and trigger a reset.
>
> Signed-off-by: Nicolas Saenz Julienne <nsaenzjulie...@suse.de>
>
> ---
>
> Changes since v2:
> - Also reset on resume
>
> Changes since v1:
> - Use proper reset API
> - Make code simpler
>
> drivers/usb/host/xhci-pci.c | 10 ++++++++++
> drivers/usb/host/xhci.h | 2 ++
> 2 files changed, 12 insertions(+)
>
> diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
> index ef513c2fb843..e76b9283faa3 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/reset.h>
>
> #include "xhci.h"
> #include "xhci-trace.h"
> @@ -339,6 +340,7 @@ static int xhci_pci_probe(struct pci_dev *dev, const
> struct pci_device_id *id)
> struct xhci_hcd *xhci;
> struct usb_hcd *hcd;
> struct xhci_driver_data *driver_data;
> + struct reset_control *reset;
>
> driver_data = (struct xhci_driver_data *)id->driver_data;
> if (driver_data && driver_data->quirks & XHCI_RENESAS_FW_QUIRK) {
> @@ -347,6 +349,11 @@ static int xhci_pci_probe(struct pci_dev *dev, const
> struct pci_device_id *id)
> return retval;
> }
>
> + reset = devm_reset_control_get_optional_exclusive(&dev->bus->dev, NULL);
> + if (IS_ERR(reset))
> + return PTR_ERR(reset);
> + reset_control_reset(reset);
Reviewed-by: Philipp Zabel <p.za...@pengutronix.de>
regards
Philipp
