This reverts commit 6ccb83d6c4972ebe6ae49de5eba051de3638362c.
Commit 6ccb83d6c497 ("usb: xhci: Implement xhci_handshake_check_state() helper") was introduced to workaround watchdog timeout issues on some platforms, allowing xhci_reset() to bail out early without waiting for the reset to complete.
Skipping the xhci handshake during a reset is a dangerous move. The xhci specification explicitly states that certain registers cannot be accessed during reset in section 5.4.1 USB Command Register (USBCMD), Host Controller Reset (HCRST) field: "This bit is cleared to '0' by the Host Controller when the reset process is complete. Software cannot terminate the reset process early by writinga '0' to this bit and shall not write any xHC Operational or Runtime registers until while HCRST is '1'."
This behavior causes a regression on SNPS DWC3 USB controller with dual-role capability. When the DWC3 controller exits host mode and removes xhci while a reset is still in progress, and then tries to configure its hardware for device mode, the ongoing reset leads to register access issues; specifically, all register reads returns 0. These issues extend beyond the xhci register space (which is expected during a reset) and affect the entire DWC3 IP block, causing the DWC3 device mode to malfunction.
Cc: stable@vger.kernel.org Fixes: 6ccb83d6c497 ("usb: xhci: Implement xhci_handshake_check_state() helper") Signed-off-by: Roy Luo royluo@google.com --- Changes in v1: - Link to previous patchset: https://lore.kernel.org/r/20250515185227.1507363-1-royluo@google.com/ --- drivers/usb/host/xhci-ring.c | 5 ++--- drivers/usb/host/xhci.c | 26 +------------------------- drivers/usb/host/xhci.h | 2 -- 3 files changed, 3 insertions(+), 30 deletions(-)
diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c index 423bf3649570..b720e04ce7d8 100644 --- a/drivers/usb/host/xhci-ring.c +++ b/drivers/usb/host/xhci-ring.c @@ -518,9 +518,8 @@ static int xhci_abort_cmd_ring(struct xhci_hcd *xhci, unsigned long flags) * In the future we should distinguish between -ENODEV and -ETIMEDOUT * and try to recover a -ETIMEDOUT with a host controller reset. */ - ret = xhci_handshake_check_state(xhci, &xhci->op_regs->cmd_ring, - CMD_RING_RUNNING, 0, 5 * 1000 * 1000, - XHCI_STATE_REMOVING); + ret = xhci_handshake(&xhci->op_regs->cmd_ring, + CMD_RING_RUNNING, 0, 5 * 1000 * 1000); if (ret < 0) { xhci_err(xhci, "Abort failed to stop command ring: %d\n", ret); xhci_halt(xhci); diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c index 90eb491267b5..472c4b6ae59e 100644 --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -83,29 +83,6 @@ int xhci_handshake(void __iomem *ptr, u32 mask, u32 done, u64 timeout_us) return ret; }
-/* - * xhci_handshake_check_state - same as xhci_handshake but takes an additional - * exit_state parameter, and bails out with an error immediately when xhc_state - * has exit_state flag set. - */ -int xhci_handshake_check_state(struct xhci_hcd *xhci, void __iomem *ptr, - u32 mask, u32 done, int usec, unsigned int exit_state) -{ - u32 result; - int ret; - - ret = readl_poll_timeout_atomic(ptr, result, - (result & mask) == done || - result == U32_MAX || - xhci->xhc_state & exit_state, - 1, usec); - - if (result == U32_MAX || xhci->xhc_state & exit_state) - return -ENODEV; - - return ret; -} - /* * Disable interrupts and begin the xHCI halting process. */ @@ -226,8 +203,7 @@ int xhci_reset(struct xhci_hcd *xhci, u64 timeout_us) if (xhci->quirks & XHCI_INTEL_HOST) udelay(1000);
- ret = xhci_handshake_check_state(xhci, &xhci->op_regs->command, - CMD_RESET, 0, timeout_us, XHCI_STATE_REMOVING); + ret = xhci_handshake(&xhci->op_regs->command, CMD_RESET, 0, timeout_us); if (ret) return ret;
diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h index 242ab9fbc8ae..5e698561b96d 100644 --- a/drivers/usb/host/xhci.h +++ b/drivers/usb/host/xhci.h @@ -1855,8 +1855,6 @@ void xhci_remove_secondary_interrupter(struct usb_hcd /* xHCI host controller glue */ typedef void (*xhci_get_quirks_t)(struct device *, struct xhci_hcd *); int xhci_handshake(void __iomem *ptr, u32 mask, u32 done, u64 timeout_us); -int xhci_handshake_check_state(struct xhci_hcd *xhci, void __iomem *ptr, - u32 mask, u32 done, int usec, unsigned int exit_state); void xhci_quiesce(struct xhci_hcd *xhci); int xhci_halt(struct xhci_hcd *xhci); int xhci_start(struct xhci_hcd *xhci);
base-commit: 172a9d94339cea832d89630b89d314e41d622bd8