From: Oliver Neukum <oneukum@xxxxxxx>
On some older XHCIs streams are not supported and the UAS driver
will fail at probe time. For those devices storage should try
to bind to UAS devices.
This patch adds a flag for stream support to HCDs and evaluates
it.
[Note: Sarah fixed a bug where the USB 2.0 root hub, not USB 3.0 root
hub would get marked as being able to support streams.]
Signed-off-by: Oliver Neukum <oliver@xxxxxxxxxx>
Signed-off-by: Sarah Sharp <sarah.a.sharp@xxxxxxxxxxxxxxx>
Acked-by: Hans de Goede <hdegoede@xxxxxxxxxx>
---
drivers/usb/host/xhci-pci.c | 3 +++
drivers/usb/host/xhci-plat.c | 3 +++
drivers/usb/storage/uas-detect.h | 4 ++++
include/linux/usb/hcd.h | 1 +
4 files changed, 11 insertions(+)
diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
index 6c03584ac15f..cbf0c5cffc92 100644
--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -222,6 +222,9 @@ static int xhci_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
goto put_usb3_hcd;
/* Roothub already marked as USB 3.0 speed */
+ if (HCC_MAX_PSA(xhci->hcc_params) >= 4)
+ xhci->shared_hcd->can_do_streams = 1;
+
return 0;
put_usb3_hcd:
diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
index 8affef910782..151901ce1ba9 100644
--- a/drivers/usb/host/xhci-plat.c
+++ b/drivers/usb/host/xhci-plat.c
@@ -158,6 +158,9 @@ static int xhci_plat_probe(struct platform_device *pdev)
*/
*((struct xhci_hcd **) xhci->shared_hcd->hcd_priv) = xhci;
+ if (HCC_MAX_PSA(xhci->hcc_params) >= 4)
+ xhci->shared_hcd->can_do_streams = 1;
+
ret = usb_add_hcd(xhci->shared_hcd, irq, IRQF_SHARED);
if (ret)
goto put_usb3_hcd;
diff --git a/drivers/usb/storage/uas-detect.h b/drivers/usb/storage/uas-detect.h
index b8a02e12a8a2..bb05b984d5f6 100644
--- a/drivers/usb/storage/uas-detect.h
+++ b/drivers/usb/storage/uas-detect.h
@@ -72,6 +72,7 @@ static int uas_use_uas_driver(struct usb_interface *intf,
{
struct usb_host_endpoint *eps[4] = { };
struct usb_device *udev = interface_to_usbdev(intf);
+ struct usb_hcd *hcd = bus_to_hcd(udev->bus);
unsigned long flags = id->driver_info;
int r, alt;
@@ -80,6 +81,9 @@ static int uas_use_uas_driver(struct usb_interface *intf,
if (flags & US_FL_IGNORE_UAS)
return 0;
+ if (udev->speed >= USB_SPEED_SUPER && !hcd->can_do_streams)
+ return 0;
+
alt = uas_find_uas_alt_setting(intf);
if (alt < 0)
return 0;
diff --git a/include/linux/usb/hcd.h b/include/linux/usb/hcd.h
index efe8d8a7c7ad..485cd5e2100c 100644
--- a/include/linux/usb/hcd.h
+++ b/include/linux/usb/hcd.h
@@ -143,6 +143,7 @@ struct usb_hcd {
unsigned authorized_default:1;
unsigned has_tt:1; /* Integrated TT in root hub */
unsigned amd_resume_bug:1; /* AMD remote wakeup quirk */
+ unsigned can_do_streams:1; /* HC supports streams */
unsigned int irq; /* irq allocated */
void __iomem *regs; /* device memory/io */
--
1.8.5.5
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