diff options
| author | Chris Packham <judge.packham@gmail.com> | 2018-10-04 20:03:53 +1300 |
|---|---|---|
| committer | York Sun <york.sun@nxp.com> | 2018-10-29 13:13:05 -0700 |
| commit | 4eaf7f525a0874a1eff0f5666004896cc5c89fa3 (patch) | |
| tree | 551c1b5d786f0f8fc0182361ad98f591c6a71481 /drivers/usb/host/ehci-hcd.c | |
| parent | 454cf76184c65426b68033a23da086e73663f2fc (diff) | |
fsl/usb: Workaround for USB erratum-A005275
Workaround makes FS as default mode on all affected socs.
Add support to check erratum-A005275 validity for an soc. This info is
required to determine whether a given soc is affected by this erratum.
Add quirk for this erratum "has_fsl_erratum_a005275" . This quirk is used
to enable workaround for the errata
Force FS mode as default by:
- making EPS as FS
- setting PFSC bit to disable HS chirping
This workaround can be disabled by mentioning "no_erratum_a005275" in
hwconfig string
Signed-off-by: Chris Packham <judge.packham@gmail.com>
Reviewed-by: York Sun <york.sun@nxp.com>
Diffstat (limited to 'drivers/usb/host/ehci-hcd.c')
| -rw-r--r-- | drivers/usb/host/ehci-hcd.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c index 199b3a8b26..d1d8f08d98 100644 --- a/drivers/usb/host/ehci-hcd.c +++ b/drivers/usb/host/ehci-hcd.c @@ -409,9 +409,15 @@ ehci_submit_async(struct usb_device *dev, unsigned long pipe, void *buffer, endpt = QH_ENDPT1_RL(8) | QH_ENDPT1_C(c) | QH_ENDPT1_MAXPKTLEN(maxpacket) | QH_ENDPT1_H(0) | QH_ENDPT1_DTC(QH_ENDPT1_DTC_DT_FROM_QTD) | - QH_ENDPT1_EPS(ehci_encode_speed(dev->speed)) | QH_ENDPT1_ENDPT(usb_pipeendpoint(pipe)) | QH_ENDPT1_I(0) | QH_ENDPT1_DEVADDR(usb_pipedevice(pipe)); + + /* Force FS for fsl HS quirk */ + if (!ctrl->has_fsl_erratum_a005275) + endpt |= QH_ENDPT1_EPS(ehci_encode_speed(dev->speed)); + else + endpt |= QH_ENDPT1_EPS(ehci_encode_speed(QH_FULL_SPEED)); + qh->qh_endpt1 = cpu_to_hc32(endpt); endpt = QH_ENDPT2_MULT(1) | QH_ENDPT2_UFCMASK(0) | QH_ENDPT2_UFSMASK(0); qh->qh_endpt2 = cpu_to_hc32(endpt); @@ -832,6 +838,10 @@ static int ehci_submit_root(struct usb_device *dev, unsigned long pipe, } else { int ret; + /* Disable chirp for HS erratum */ + if (ctrl->has_fsl_erratum_a005275) + reg |= PORTSC_FSL_PFSC; + reg |= EHCI_PS_PR; reg &= ~EHCI_PS_PE; ehci_writel(status_reg, reg); |