4.1-stable review patch. If anyone has any objections, please let me know.
------------------
From: Douglas Gilbert <dgilb...@interlog.com>
commit d134c48d889ddceadf4c990e6f3df16b816ed5d4 upstream.
Following changes that appeared in lk 4.0.0, the gadget udc driver for
some ARM based Atmel SoCs (e.g. at91sam9x5 and sama5d3 families)
incorrectly deduced full-speed USB link speed even when the hardware
had negotiated a high-speed link. The fix is to make sure that the
UDPHS Interrupt Enable Register value does not mask the SPEED bit
in the Interrupt Status Register.
For a mass storage gadget this problem lead to failures when the host
had a USB 3 port with the xhci_hcd driver. If the host was a USB 2
port using the ehci_hcd driver then the mass storage gadget worked
(but probably at a lower speed than it should have).
Signed-off-by: Douglas Gilbert <dgilb...@interlog.com>
Reviewed-by: Boris Brezillon <boris.brezil...@free-electrons.com>
Fixes: 9870d895ad87 ("usb: atmel_usba_udc: Mask status with enabled irqs")
Signed-off-by: Felipe Balbi <ba...@ti.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
drivers/usb/gadget/udc/atmel_usba_udc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/usb/gadget/udc/atmel_usba_udc.c
+++ b/drivers/usb/gadget/udc/atmel_usba_udc.c
@@ -1634,7 +1634,7 @@ static irqreturn_t usba_udc_irq(int irq,
spin_lock(&udc->lock);
int_enb = usba_int_enb_get(udc);
- status = usba_readl(udc, INT_STA) & int_enb;
+ status = usba_readl(udc, INT_STA) & (int_enb | USBA_HIGH_SPEED);
DBG(DBG_INT, "irq, status=%#08x\n", status);
if (status & USBA_DET_SUSPEND) {
--
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