diff options
| author |   Felipe Balbi <balbi@ti.com> | 2011-09-30 10:58:50 +0300 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@suse.de> | 2011-10-04 10:25:56 -0700 |
| commit | aabb70752361a8b8ca44142a942a5bd133c4d304 (patch) | |
| tree | ddc6da1f1a031834d9478cc85301c2d796da389a /drivers/usb/dwc3 | |
| parent | usb: dwc3: core: cache GHWPARAMS* registers (diff) | |
| download | linux-dev-aabb70752361a8b8ca44142a942a5bd133c4d304.tar.xz linux-dev-aabb70752361a8b8ca44142a942a5bd133c4d304.zip | |
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>
Diffstat (limited to 'drivers/usb/dwc3')
| -rw-r--r-- | drivers/usb/dwc3/core.h | 6 | ||||
| -rw-r--r-- | drivers/usb/dwc3/gadget.c | 8 |
2 files changed, 14 insertions, 0 deletions
diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h index a763ba705bff..29a8e1679e12 100644 --- a/drivers/usb/dwc3/core.h +++ b/drivers/usb/dwc3/core.h @@ -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) diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c index 8d8502373db6..fd1ac4dd5600 100644 --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -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 |