From: Michael Grzeschik <m.grzeschik@xxxxxxxxxxxxxx>
commit 5d5323a6f3625f101dbfa94ba3ef7706cce38760 upstream.
The commit 0472bf06c6fd ("xhci: Prevent U1/U2 link pm states if exit
latency is too long") was constraining the xhci code not to allow U1/U2
sleep states if the latency to wake up from the U-states reached the
service interval of an periodic endpoint. This fix was not taking into
account that in case the quirk XHCI_INTEL_HOST is set, the wakeup time
will be calculated and configured differently.
It checks for u1_params.mel/u2_params.mel as a limit. But the code could
decide to write another MEL into the hardware. This leads to broken
cases where not enough bandwidth is available for other devices:
usb 1-2: can't set config #1, error -28
This patch is fixing that case by checking for timeout_ns after the
wakeup time was calculated depending on the quirks.
Fixes: 0472bf06c6fd ("xhci: Prevent U1/U2 link pm states if exit latency is too long")
Signed-off-by: Michael Grzeschik <m.grzeschik@xxxxxxxxxxxxxx>
Cc: stable <stable@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20201215193147.11738-1-m.grzeschik@xxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/host/xhci.c | 24 ++++++++++++------------
1 file changed, 12 insertions(+), 12 deletions(-)
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -4428,19 +4428,19 @@ static u16 xhci_calculate_u1_timeout(str
{
unsigned long long timeout_ns;
+ if (xhci->quirks & XHCI_INTEL_HOST)
+ timeout_ns = xhci_calculate_intel_u1_timeout(udev, desc);
+ else
+ timeout_ns = udev->u1_params.sel;
+
/* Prevent U1 if service interval is shorter than U1 exit latency */
if (usb_endpoint_xfer_int(desc) || usb_endpoint_xfer_isoc(desc)) {
- if (xhci_service_interval_to_ns(desc) <= udev->u1_params.mel) {
+ if (xhci_service_interval_to_ns(desc) <= timeout_ns) {
dev_dbg(&udev->dev, "Disable U1, ESIT shorter than exit latency\n");
return USB3_LPM_DISABLED;
}
}
- if (xhci->quirks & XHCI_INTEL_HOST)
- timeout_ns = xhci_calculate_intel_u1_timeout(udev, desc);
- else
- timeout_ns = udev->u1_params.sel;
-
/* The U1 timeout is encoded in 1us intervals.
* Don't return a timeout of zero, because that's USB3_LPM_DISABLED.
*/
@@ -4492,19 +4492,19 @@ static u16 xhci_calculate_u2_timeout(str
{
unsigned long long timeout_ns;
+ if (xhci->quirks & XHCI_INTEL_HOST)
+ timeout_ns = xhci_calculate_intel_u2_timeout(udev, desc);
+ else
+ timeout_ns = udev->u2_params.sel;
+
/* Prevent U2 if service interval is shorter than U2 exit latency */
if (usb_endpoint_xfer_int(desc) || usb_endpoint_xfer_isoc(desc)) {
- if (xhci_service_interval_to_ns(desc) <= udev->u2_params.mel) {
+ if (xhci_service_interval_to_ns(desc) <= timeout_ns) {
dev_dbg(&udev->dev, "Disable U2, ESIT shorter than exit latency\n");
return USB3_LPM_DISABLED;
}
}
- if (xhci->quirks & XHCI_INTEL_HOST)
- timeout_ns = xhci_calculate_intel_u2_timeout(udev, desc);
- else
- timeout_ns = udev->u2_params.sel;
-
/* The U2 timeout is encoded in 256us intervals */
timeout_ns = DIV_ROUND_UP_ULL(timeout_ns, 256 * 1000);
/* If the necessary timeout value is bigger than what we can set in the
