Hello.
Sarah Sharp wrote:
When the run bit is set in the xHCI command register, it may take a few
microseconds for the host to start running. We cannot ring any doorbells
until the host is actually running, so wait until the status register says
the host is running.
Signed-off-by: Sarah Sharp <sarah.a.sharp@xxxxxxxxxxxxxxx>
Reported-by: Shinya Saito <shinya.saito.sx@xxxxxxxxxxx>
---
drivers/usb/host/xhci.c | 39 ++++++++++++++++++++++++++++++++-------
1 files changed, 32 insertions(+), 7 deletions(-)
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index 79ccfe5..8a49c67 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -106,6 +106,33 @@ int xhci_halt(struct xhci_hcd *xhci)
}
/*
+ * Set the run bit and wait for the host to be running.
+ */
+int xhci_start(struct xhci_hcd *xhci)
+{
+ u32 temp;
+ int ret;
+
+ temp = xhci_readl(xhci, &xhci->op_regs->command);
+ temp |= (CMD_RUN);
Useless parens.
WBR, Sergei
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