diff options
| author | Nikhil Badola <nikhil.badola@freescale.com> | 2015-09-04 04:45:58 (GMT) |
|---|---|---|
| committer | Xie Xiaobo <xiaobo.xie@nxp.com> | 2017-09-25 07:25:50 (GMT) |
| commit | 2edcc4c298119b54bcc71b60392cd6be5eadf003 (patch) | |
| tree | b05378ce451fd00c56f493e3a546352dccf19550 | |
| parent | 34eab549367bdaed96487fc8470ed2da4ba1070c (diff) | |
| download | linux-2edcc4c298119b54bcc71b60392cd6be5eadf003.tar.xz | |
usb: dwc3: Add frame length adjustment quirk
Add adjust_frame_length_quirk for writing to fladj register
which adjusts (micro)frame length to value provided by
"snps,quirk-frame-length-adjustment" property thus avoiding
USB 2.0 devices to time-out over a longer run
Signed-off-by: Nikhil Badola <nikhil.badola@freescale.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
| -rw-r--r-- | drivers/usb/dwc3/core.c | 30 |
1 files changed, 29 insertions, 1 deletions
diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c index 8e2e7a7..e34ef90 100644 --- a/drivers/usb/dwc3/core.c +++ b/drivers/usb/dwc3/core.c @@ -215,6 +215,32 @@ static int dwc3_soft_reset(struct dwc3 *dwc) return 0; } +/* + * dwc3_frame_length_adjustment - Adjusts frame length if required + * @dwc3: Pointer to our controller context structure + */ +static void dwc3_frame_length_adjustment(struct dwc3 *dwc) +{ + u32 reg; + u32 dft; + + if (dwc->revision < DWC3_REVISION_250A) + return; + + if (dwc->fladj == 0) + return; + + reg = dwc3_readl(dwc->regs, DWC3_GFLADJ); + dft = reg & DWC3_GFLADJ_30MHZ_MASK; + if (dft == dwc->fladj) { + dev_warn(dwc->dev, "request value same as default, ignoring\n"); + } else { + reg &= ~DWC3_GFLADJ_30MHZ_MASK; + reg |= DWC3_GFLADJ_30MHZ_SDBND_SEL | dwc->fladj; + dwc3_writel(dwc->regs, DWC3_GFLADJ, reg); + } +} + /** * dwc3_free_one_event_buffer - Frees one event buffer * @dwc: Pointer to our controller context structure @@ -810,6 +836,9 @@ static int dwc3_core_init(struct dwc3 *dwc) dwc3_set_soc_bus_cfg(dwc); + /* Adjust Frame Length */ + dwc3_frame_length_adjustment(dwc); + usb_phy_set_suspend(dwc->usb2_phy, 0); usb_phy_set_suspend(dwc->usb3_phy, 0); ret = phy_power_on(dwc->usb2_generic_phy); @@ -1107,7 +1136,6 @@ static void dwc3_get_properties(struct dwc3 *dwc) static int dwc3_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; - struct dwc3_platform_data *pdata = dev_get_platdata(dev); struct device_node *node = dev->of_node; struct resource *res; struct dwc3 *dwc; |