This is a note to let you know that I've just added the patch titled
ehci: fix EHCI host controller initialization sequence
to my usb git tree which can be found at git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git in the usb-linus branch.
The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)
The patch will hopefully also be merged in Linus's tree for the next -rc kernel release.
If you have any questions about this process, please let me know.
From 280a9045bb18833db921b316a5527d2b565e9f2e Mon Sep 17 00:00:00 2001
From: Eugene Korenevsky ekorenevsky@astralinux.ru Date: Sun, 10 Jan 2021 20:36:09 +0300 Subject: ehci: fix EHCI host controller initialization sequence
According to EHCI spec, EHCI HC clears USBSTS.HCHalted whenever USBCMD.RS=1.
However, it is a good practice to wait some time after setting USBCMD.RS (approximately 100ms) until USBSTS.HCHalted become zero.
Without this waiting, VirtualBox's EHCI virtual HC accidentally hangs (see BugLink).
BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=211095 Acked-by: Alan Stern stern@rowland.harvard.edu Signed-off-by: Eugene Korenevsky ekorenevsky@astralinux.ru Cc: stable stable@vger.kernel.org Link: https://lore.kernel.org/r/20210110173609.GA17313@himera.home Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/usb/host/ehci-hcd.c | 12 ++++++++++++ 1 file changed, 12 insertions(+)
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c index e358ae17d51e..1926b328b6aa 100644 --- a/drivers/usb/host/ehci-hcd.c +++ b/drivers/usb/host/ehci-hcd.c @@ -574,6 +574,7 @@ static int ehci_run (struct usb_hcd *hcd) struct ehci_hcd *ehci = hcd_to_ehci (hcd); u32 temp; u32 hcc_params; + int rc;
hcd->uses_new_polling = 1;
@@ -629,9 +630,20 @@ static int ehci_run (struct usb_hcd *hcd) down_write(&ehci_cf_port_reset_rwsem); ehci->rh_state = EHCI_RH_RUNNING; ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag); + + /* Wait until HC become operational */ ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */ msleep(5); + rc = ehci_handshake(ehci, &ehci->regs->status, STS_HALT, 0, 100 * 1000); + up_write(&ehci_cf_port_reset_rwsem); + + if (rc) { + ehci_err(ehci, "USB %x.%x, controller refused to start: %d\n", + ((ehci->sbrn & 0xf0)>>4), (ehci->sbrn & 0x0f), rc); + return rc; + } + ehci->last_periodic_enable = ktime_get_real();
temp = HC_VERSION(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));