diff options
author | 2017-03-08 23:13:28 -0800 | |
---|---|---|
committer | 2017-03-08 23:36:15 -0800 | |
commit | 52f993b8e89487ec9ee15a7fb4979e0f09a45b27 (patch) | |
tree | d65304486afe0bea4a311c783c0d72791c8c0aa2 /kernel/drivers/usb/host/xhci-hub.c | |
parent | c189ccac5702322ed843fe17057035b7222a59b6 (diff) |
Upgrade to 4.4.50-rt62
The current kernel is based on rt kernel v4.4.6-rt14. We will upgrade it
to 4.4.50-rt62.
The command to achieve it is:
a) Clone a git repo from
git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-stable-rt.git
b) Get the diff between this two changesets:
git diff 640eca2901f3435e616157b11379d3223a44b391
705619beeea1b0b48219a683fd1a901a86fdaf5e
where the two commits are:
[yjiang5@jnakajim-build linux-stable-rt]$ git show --oneline --name-only
640eca2901f3435e616157b11379d3223a44b391
640eca2901f3 v4.4.6-rt14
localversion-rt
[yjiang5@jnakajim-build linux-stable-rt]$ git show --oneline --name-only
705619beeea1b0b48219a683fd1a901a86fdaf5e
705619beeea1 Linux 4.4.50-rt62
localversion-rt
c) One patch has been backported thus revert the patch before applying.
filterdiff -p1 -x scripts/package/Makefile
~/tmp/v4.4.6-rt14-4.4.50-rt62.diff |patch -p1 --dry-run
Upstream status: backport
Change-Id: I244d57a32f6066e5a5b9915f9fbf99e7bbca6e01
Signed-off-by: Yunhong Jiang <yunhong.jiang@linux.intel.com>
Diffstat (limited to 'kernel/drivers/usb/host/xhci-hub.c')
-rw-r--r-- | kernel/drivers/usb/host/xhci-hub.c | 44 |
1 files changed, 42 insertions, 2 deletions
diff --git a/kernel/drivers/usb/host/xhci-hub.c b/kernel/drivers/usb/host/xhci-hub.c index f980c239e..e9675e8f0 100644 --- a/kernel/drivers/usb/host/xhci-hub.c +++ b/kernel/drivers/usb/host/xhci-hub.c @@ -377,6 +377,9 @@ static int xhci_stop_device(struct xhci_hcd *xhci, int slot_id, int suspend) ret = 0; virt_dev = xhci->devs[slot_id]; + if (!virt_dev) + return -ENODEV; + cmd = xhci_alloc_command(xhci, false, true, GFP_NOIO); if (!cmd) { xhci_dbg(xhci, "Couldn't allocate command structure.\n"); @@ -1154,7 +1157,7 @@ int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue, xhci_set_link_state(xhci, port_array, wIndex, XDEV_RESUME); spin_unlock_irqrestore(&xhci->lock, flags); - msleep(20); + msleep(USB_RESUME_TIMEOUT); spin_lock_irqsave(&xhci->lock, flags); xhci_set_link_state(xhci, port_array, wIndex, XDEV_U0); @@ -1343,6 +1346,35 @@ int xhci_bus_suspend(struct usb_hcd *hcd) return 0; } +/* + * Workaround for missing Cold Attach Status (CAS) if device re-plugged in S3. + * warm reset a USB3 device stuck in polling or compliance mode after resume. + * See Intel 100/c230 series PCH specification update Doc #332692-006 Errata #8 + */ +static bool xhci_port_missing_cas_quirk(int port_index, + __le32 __iomem **port_array) +{ + u32 portsc; + + portsc = readl(port_array[port_index]); + + /* if any of these are set we are not stuck */ + if (portsc & (PORT_CONNECT | PORT_CAS)) + return false; + + if (((portsc & PORT_PLS_MASK) != XDEV_POLLING) && + ((portsc & PORT_PLS_MASK) != XDEV_COMP_MODE)) + return false; + + /* clear wakeup/change bits, and do a warm port reset */ + portsc &= ~(PORT_RWC_BITS | PORT_CEC | PORT_WAKE_BITS); + portsc |= PORT_WR; + writel(portsc, port_array[port_index]); + /* flush write */ + readl(port_array[port_index]); + return true; +} + int xhci_bus_resume(struct usb_hcd *hcd) { struct xhci_hcd *xhci = hcd_to_xhci(hcd); @@ -1380,6 +1412,14 @@ int xhci_bus_resume(struct usb_hcd *hcd) u32 temp; temp = readl(port_array[port_index]); + + /* warm reset CAS limited ports stuck in polling/compliance */ + if ((xhci->quirks & XHCI_MISSING_CAS) && + (hcd->speed >= HCD_USB3) && + xhci_port_missing_cas_quirk(port_index, port_array)) { + xhci_dbg(xhci, "reset stuck port %d\n", port_index); + continue; + } if (DEV_SUPERSPEED_ANY(temp)) temp &= ~(PORT_RWC_BITS | PORT_CEC | PORT_WAKE_BITS); else @@ -1398,7 +1438,7 @@ int xhci_bus_resume(struct usb_hcd *hcd) if (need_usb2_u3_exit) { spin_unlock_irqrestore(&xhci->lock, flags); - msleep(20); + msleep(USB_RESUME_TIMEOUT); spin_lock_irqsave(&xhci->lock, flags); } |