Some atypical users of xhci 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 nsaenzjulienne@suse.de
--- Changes since v5: - Take !CONFIG_IS_ENABLED(DM_RESET) into account
drivers/usb/host/xhci-mem.c | 2 ++ drivers/usb/host/xhci.c | 33 +++++++++++++++++++++++++++++++++ include/usb/xhci.h | 2 ++ 3 files changed, 37 insertions(+)
diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c index f446520528..108f4bd8cf 100644 --- a/drivers/usb/host/xhci-mem.c +++ b/drivers/usb/host/xhci-mem.c @@ -180,6 +180,8 @@ void xhci_cleanup(struct xhci_ctrl *ctrl) xhci_free_virt_devices(ctrl); free(ctrl->erst.entries); free(ctrl->dcbaa); + if (reset_valid(&ctrl->reset)) + reset_free(&ctrl->reset); memset(ctrl, '\0', sizeof(struct xhci_ctrl)); }
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c index ebd2954571..e252964d0d 100644 --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -190,6 +190,35 @@ static int xhci_start(struct xhci_hcor *hcor) return ret; }
+/** + * Resets XHCI Hardware + * + * @param ctrl pointer to host controller + * @return 0 if OK, or a negative error code. + */ +static int xhci_reset_hw(struct xhci_ctrl *ctrl) +{ + int ret; + + ret = reset_get_by_index(ctrl->dev, 0, &ctrl->reset); + if (ret && ret != -ENOENT && ret != -ENOTSUPP) { + dev_err(ctrl->dev, "failed to get reset\n"); + return ret; + } + + if (reset_valid(&ctrl->reset)) { + ret = reset_assert(&ctrl->reset); + if (ret) + return ret; + + ret = reset_deassert(&ctrl->reset); + if (ret) + return ret; + } + + return 0; +} + /** * Resets the XHCI Controller * @@ -1508,6 +1537,10 @@ int xhci_register(struct udevice *dev, struct xhci_hccr *hccr,
ctrl->dev = dev;
+ ret = xhci_reset_hw(ctrl); + if (ret) + goto err; + /* * XHCI needs to issue a Address device command to setup * proper device context structures, before it can interact diff --git a/include/usb/xhci.h b/include/usb/xhci.h index 1170c0ac69..7d34103fd5 100644 --- a/include/usb/xhci.h +++ b/include/usb/xhci.h @@ -16,6 +16,7 @@ #ifndef HOST_XHCI_H_ #define HOST_XHCI_H_
+#include <reset.h> #include <asm/types.h> #include <asm/cache.h> #include <asm/io.h> @@ -1209,6 +1210,7 @@ struct xhci_ctrl { #if CONFIG_IS_ENABLED(DM_USB) struct udevice *dev; #endif + struct reset_ctl reset; struct xhci_hccr *hccr; /* R/O registers, not need for volatile */ struct xhci_hcor *hcor; struct xhci_doorbell_array *dba;