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usb: dwc3: gadget: allow clock gating to work 

The dwc3 core has internal clock gating support.

Let's allow that to happen by clearing the disable
bit in GCTL register.

Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Felipe Balbi 2011-09-30 10:58:50 +03:00 committed by Greg Kroah-Hartman
parent 26ceca9750
commit aabb707523
2 changed files with 14 additions and 0 deletions
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6
drivers/usb/dwc3/core.h
View File

@ -161,6 +161,7 @@
#define DWC3_GCTL_CORESOFTRESET (1 << 11)
#define DWC3_GCTL_SCALEDOWN(n) (n << 4)
#define DWC3_GCTL_DISSCRAMBLE (1 << 3)
#define DWC3_GCTL_DSBLCLKGTNG (1 << 0)
/* Global USB2 PHY Configuration Register */
#define DWC3_GUSB2PHYCFG_PHYSOFTRST (1 << 31)
@ -170,6 +171,11 @@
#define DWC3_GUSB3PIPECTL_PHYSOFTRST (1 << 31)
#define DWC3_GUSB3PIPECTL_SUSPHY (1 << 17)
/* Global HWPARAMS1 Register */
#define DWC3_GHWPARAMS1_EN_PWROPT(n) ((n & (3 << 24)) >> 24)
#define DWC3_GHWPARAMS1_EN_PWROPT_NO 0
#define DWC3_GHWPARAMS1_EN_PWROPT_CLK 1
/* Device Configuration Register */
#define DWC3_DCFG_DEVADDR(addr) ((addr) << 3)
#define DWC3_DCFG_DEVADDR_MASK DWC3_DCFG_DEVADDR(0x7f)

8
drivers/usb/dwc3/gadget.c
View File

@ -1164,6 +1164,14 @@ static int dwc3_gadget_start(struct usb_gadget *g,
reg &= ~DWC3_GCTL_DISSCRAMBLE;
reg |= DWC3_GCTL_PRTCAPDIR(DWC3_GCTL_PRTCAP_DEVICE);
switch (DWC3_GHWPARAMS1_EN_PWROPT(dwc->hwparams.hwparams0)) {
case DWC3_GHWPARAMS1_EN_PWROPT_CLK:
reg &= ~DWC3_GCTL_DSBLCLKGTNG;
break;
default:
dev_dbg(dwc->dev, "No power optimization available\n");
}
/*
* WORKAROUND: DWC3 revisions <1.90a have a bug
* when The device fails to connect at SuperSpeed