diff options
| author | John Youn <johnyoun@synopsys.com> | 2016-11-14 21:32:43 +0100 |
|---|---|---|
| committer | Felipe Balbi <felipe.balbi@linux.intel.com> | 2016-11-18 12:54:51 +0100 |
| commit | cf40b86b6ef6df5262ef5a8463b42524e6aa5590 (patch) | |
| tree | 6b41f22b027882f680188af07bf8d2d736cca3fc /drivers/usb/dwc3/gadget.c | |
| parent | usb: dwc2: add amcc,dwc-otg support (diff) | |
| download | linux-cf40b86b6ef6df5262ef5a8463b42524e6aa5590.tar.xz linux-cf40b86b6ef6df5262ef5a8463b42524e6aa5590.zip | |
usb: dwc3: Implement interrupt moderation
Implement interrupt moderation which allows the interrupt rate to be
throttled. To enable this feature the dwc->imod_interval must be set to
1 or greater. This value specifies the minimum inter-interrupt interval,
in 250 ns increments. A value of 0 disables interrupt moderation.
This applies for DWC_usb3 version 3.00a and higher and for DWC_usb31
version 1.20a and higher.
Signed-off-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Diffstat (limited to 'drivers/usb/dwc3/gadget.c')
| -rw-r--r-- | drivers/usb/dwc3/gadget.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c index 3d5ba4106979..e2416de36bb0 100644 --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -1685,6 +1685,17 @@ static int __dwc3_gadget_start(struct dwc3 *dwc) int ret = 0; u32 reg; + /* + * Use IMOD if enabled via dwc->imod_interval. Otherwise, if + * the core supports IMOD, disable it. + */ + if (dwc->imod_interval) { + dwc3_writel(dwc->regs, DWC3_DEV_IMOD(0), dwc->imod_interval); + dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(0), DWC3_GEVNTCOUNT_EHB); + } else if (dwc3_has_imod(dwc)) { + dwc3_writel(dwc->regs, DWC3_DEV_IMOD(0), 0); + } + reg = dwc3_readl(dwc->regs, DWC3_DCFG); reg &= ~(DWC3_DCFG_SPEED_MASK); @@ -2847,6 +2858,11 @@ static irqreturn_t dwc3_process_event_buf(struct dwc3_event_buffer *evt) reg &= ~DWC3_GEVNTSIZ_INTMASK; dwc3_writel(dwc->regs, DWC3_GEVNTSIZ(0), reg); + if (dwc->imod_interval) { + dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(0), DWC3_GEVNTCOUNT_EHB); + dwc3_writel(dwc->regs, DWC3_DEV_IMOD(0), dwc->imod_interval); + } + return ret; } |