diff options
| author | Nikhil Badola <nikhil.badola@freescale.com> | 2015-09-04 07:45:58 +0300 |
|---|---|---|
| committer | Felipe Balbi <balbi@ti.com> | 2015-09-27 18:54:31 +0300 |
| commit | db2be4e9e30c6e43e48c5749d3fc74cee0a6bbb3 (patch) | |
| tree | 432c121be730e9333f10efcd857afaf2a986c7f0 /drivers/usb/dwc3/core.c | |
| parent | 3737c54418c35034127bf2837e9b27a3c3c67940 (diff) | |
| download | linux-db2be4e9e30c6e43e48c5749d3fc74cee0a6bbb3.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>
Diffstat (limited to 'drivers/usb/dwc3/core.c')
| -rw-r--r-- | drivers/usb/dwc3/core.c | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c index 064123e44566..6270581fc7a9 100644 --- a/drivers/usb/dwc3/core.c +++ b/drivers/usb/dwc3/core.c @@ -143,6 +143,32 @@ 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 + * @fladj: Value of GFLADJ_30MHZ to adjust frame length + */ +static void dwc3_frame_length_adjustment(struct dwc3 *dwc, u32 fladj) +{ + u32 reg; + u32 dft; + + if (dwc->revision < DWC3_REVISION_250A) + return; + + if (fladj == 0) + return; + + reg = dwc3_readl(dwc->regs, DWC3_GFLADJ); + dft = reg & DWC3_GFLADJ_30MHZ_MASK; + if (!dev_WARN_ONCE(dwc->dev, dft == fladj, + "request value same as default, ignoring\n")) { + reg &= ~DWC3_GFLADJ_30MHZ_MASK; + reg |= DWC3_GFLADJ_30MHZ_SDBND_SEL | fladj; + dwc3_writel(dwc->regs, DWC3_GFLADJ, reg); + } +} + /** * dwc3_free_one_event_buffer - Frees one event buffer * @dwc: Pointer to our controller context structure @@ -779,6 +805,7 @@ static int dwc3_probe(struct platform_device *pdev) u8 lpm_nyet_threshold; u8 tx_de_emphasis; u8 hird_threshold; + u32 fladj = 0; int ret; @@ -886,6 +913,9 @@ static int dwc3_probe(struct platform_device *pdev) &tx_de_emphasis); of_property_read_string(node, "snps,hsphy_interface", &dwc->hsphy_interface); + of_property_read_u32(node, + "snps,quirk-frame-length-adjustment", + &fladj); } else if (pdata) { dwc->maximum_speed = pdata->maximum_speed; dwc->has_lpm_erratum = pdata->has_lpm_erratum; @@ -915,6 +945,7 @@ static int dwc3_probe(struct platform_device *pdev) tx_de_emphasis = pdata->tx_de_emphasis; dwc->hsphy_interface = pdata->hsphy_interface; + fladj = pdata->fladj_value; } /* default to superspeed if no maximum_speed passed */ @@ -971,6 +1002,9 @@ static int dwc3_probe(struct platform_device *pdev) goto err1; } + /* Adjust Frame Length */ + dwc3_frame_length_adjustment(dwc, fladj); + usb_phy_set_suspend(dwc->usb2_phy, 0); usb_phy_set_suspend(dwc->usb3_phy, 0); ret = phy_power_on(dwc->usb2_generic_phy); |