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staging: dwc2: don't issue traffic to LS devices in FS mode

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I fell over the problem reported in
https://github.com/raspberrypi/linux/pull/390:

"Issuing low-speed packets when the root port is in full-speed mode
 causes the root port to stop responding. Explicitly fail when
 enqueuing URBs to a LS endpoint on a FS bus."

with my dwc2 testing in NetBSD, so I adapted the change to dwc2.

Signed-off-by: Nick Hudson <skrll@netbsd.org>
[paulz: fixed up the patch to compile under Linux, and tested it]
Signed-off-by: Paul Zimmerman <paulz@synopsys.com>
Tested-by: Stephen Warren <swarren@wwwdotorg.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Nick Hudson 2013-12-06 14:01:44 -08:00 committed by Greg Kroah-Hartman
parent 9aaf880ed4
commit 9f8144c6ed
1 changed files with 14 additions and 0 deletions
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14
drivers/staging/dwc2/hcd.c
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@ -355,6 +355,7 @@ static int dwc2_hcd_urb_enqueue(struct dwc2_hsotg *hsotg,
unsigned long flags;
u32 intr_mask;
int retval;
int dev_speed;
if (!hsotg->flags.b.port_connect_status) {
/* No longer connected */
@ -362,6 +363,19 @@ static int dwc2_hcd_urb_enqueue(struct dwc2_hsotg *hsotg,
return -ENODEV;
}
dev_speed = dwc2_host_get_speed(hsotg, urb->priv);
/* Some configurations cannot support LS traffic on a FS root port */
if ((dev_speed == USB_SPEED_LOW) &&
(hsotg->hw_params.fs_phy_type == GHWCFG2_FS_PHY_TYPE_DEDICATED) &&
(hsotg->hw_params.hs_phy_type == GHWCFG2_HS_PHY_TYPE_UTMI)) {
u32 hprt0 = readl(hsotg->regs + HPRT0);
u32 prtspd = (hprt0 & HPRT0_SPD_MASK) >> HPRT0_SPD_SHIFT;
if (prtspd == HPRT0_SPD_FULL_SPEED)
return -ENODEV;
}
qtd = kzalloc(sizeof(*qtd), mem_flags);
if (!qtd)
return -ENOMEM;