diff options
| author | Thinh Nguyen <Thinh.Nguyen@synopsys.com> | 2019-08-09 01:39:42 +0200 |
|---|---|---|
| committer | Felipe Balbi <felipe.balbi@linux.intel.com> | 2019-08-09 07:31:38 +0200 |
| commit | 4749e0e61241cc121de572520a39dab365b9ea1d (patch) | |
| tree | 9bb5f9f08c454d35eed983c0e2bd2ef70e5f3612 /drivers/usb/dwc3 | |
| parent | usb: dwc3: omap: squash include/linux/platform_data/dwc3-omap.h (diff) | |
| download | linux-4749e0e61241cc121de572520a39dab365b9ea1d.tar.xz linux-4749e0e61241cc121de572520a39dab365b9ea1d.zip | |
usb: dwc3: Update soft-reset wait polling rate
Starting from DWC_usb31 version 1.90a and later, the DCTL.CSFRST bit
will not be cleared until after all the internal clocks are synchronized
during soft-reset. This may take a little more than 50ms. Set the
polling rate at 20ms instead.
Signed-off-by: Thinh Nguyen <thinhn@synopsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Diffstat (limited to 'drivers/usb/dwc3')
| -rw-r--r-- | drivers/usb/dwc3/core.c | 23 | ||||
| -rw-r--r-- | drivers/usb/dwc3/core.h | 2 |
2 files changed, 20 insertions, 5 deletions
diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c index 98bce85c29d0..252c397860ef 100644 --- a/drivers/usb/dwc3/core.c +++ b/drivers/usb/dwc3/core.c @@ -252,12 +252,25 @@ static int dwc3_core_soft_reset(struct dwc3 *dwc) reg |= DWC3_DCTL_CSFTRST; dwc3_writel(dwc->regs, DWC3_DCTL, reg); + /* + * For DWC_usb31 controller 1.90a and later, the DCTL.CSFRST bit + * is cleared only after all the clocks are synchronized. This can + * take a little more than 50ms. Set the polling rate at 20ms + * for 10 times instead. + */ + if (dwc3_is_usb31(dwc) && dwc->revision >= DWC3_USB31_REVISION_190A) + retries = 10; + do { reg = dwc3_readl(dwc->regs, DWC3_DCTL); if (!(reg & DWC3_DCTL_CSFTRST)) goto done; - udelay(1); + if (dwc3_is_usb31(dwc) && + dwc->revision >= DWC3_USB31_REVISION_190A) + msleep(20); + else + udelay(1); } while (--retries); phy_exit(dwc->usb3_generic_phy); @@ -267,11 +280,11 @@ static int dwc3_core_soft_reset(struct dwc3 *dwc) done: /* - * For DWC_usb31 controller, once DWC3_DCTL_CSFTRST bit is cleared, - * we must wait at least 50ms before accessing the PHY domain - * (synchronization delay). DWC_usb31 programming guide section 1.3.2. + * For DWC_usb31 controller 1.80a and prior, once DCTL.CSFRST bit + * is cleared, we must wait at least 50ms before accessing the PHY + * domain (synchronization delay). */ - if (dwc3_is_usb31(dwc)) + if (dwc3_is_usb31(dwc) && dwc->revision <= DWC3_USB31_REVISION_180A) msleep(50); return 0; diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h index 3dd783b889cb..1c8b349379af 100644 --- a/drivers/usb/dwc3/core.h +++ b/drivers/usb/dwc3/core.h @@ -1137,6 +1137,8 @@ struct dwc3 { #define DWC3_USB31_REVISION_120A (0x3132302a | DWC3_REVISION_IS_DWC31) #define DWC3_USB31_REVISION_160A (0x3136302a | DWC3_REVISION_IS_DWC31) #define DWC3_USB31_REVISION_170A (0x3137302a | DWC3_REVISION_IS_DWC31) +#define DWC3_USB31_REVISION_180A (0x3138302a | DWC3_REVISION_IS_DWC31) +#define DWC3_USB31_REVISION_190A (0x3139302a | DWC3_REVISION_IS_DWC31) u32 version_type; |