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| author | John Youn <johnyoun@synopsys.com> | 2016-11-14 12:32:43 -0800 |
|---|---|---|
| committer | Felipe Balbi <felipe.balbi@linux.intel.com> | 2016-11-18 13:54:51 +0200 |
| commit | cf40b86b6ef6df5262ef5a8463b42524e6aa5590 (patch) | |
| tree | 6b41f22b027882f680188af07bf8d2d736cca3fc /drivers/usb/dwc3/core.c | |
| parent | 3922fb46f06035a246d31d25869a3276f1a1afa3 (diff) | |
| download | linux-stable-cf40b86b6ef6df5262ef5a8463b42524e6aa5590.tar.gz linux-stable-cf40b86b6ef6df5262ef5a8463b42524e6aa5590.tar.bz2 linux-stable-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/core.c')
| -rw-r--r-- | drivers/usb/dwc3/core.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c index 87d0cfb7b29e..889dbabc7c2d 100644 --- a/drivers/usb/dwc3/core.c +++ b/drivers/usb/dwc3/core.c @@ -982,12 +982,28 @@ static void dwc3_get_properties(struct dwc3 *dwc) dwc->hird_threshold = hird_threshold | (dwc->is_utmi_l1_suspend << 4); + dwc->imod_interval = 0; +} + +/* check whether the core supports IMOD */ +bool dwc3_has_imod(struct dwc3 *dwc) +{ + return ((dwc3_is_usb3(dwc) && + dwc->revision >= DWC3_REVISION_300A) || + (dwc3_is_usb31(dwc) && + dwc->revision >= DWC3_USB31_REVISION_120A)); } static void dwc3_check_params(struct dwc3 *dwc) { struct device *dev = dwc->dev; + /* Check for proper value of imod_interval */ + if (dwc->imod_interval && !dwc3_has_imod(dwc)) { + dev_warn(dwc->dev, "Interrupt moderation not supported\n"); + dwc->imod_interval = 0; + } + /* Check the maximum_speed parameter */ switch (dwc->maximum_speed) { case USB_SPEED_LOW: |