diff options
| author | Danesh Petigara <danesh.petigara@broadcom.com> | 2020-07-22 13:07:45 -0400 |
|---|---|---|
| committer | Felipe Balbi <balbi@kernel.org> | 2020-07-24 16:45:15 +0300 |
| commit | 5fc453d7de3d0c345812453823a3a56783c5f82c (patch) | |
| tree | 74c1c14539c82654f229adb1d85494f709576b15 /drivers/usb/gadget/udc/bdc | |
| parent | b10d33c4f068ebb70a607d644b7ace259127aa18 (diff) | |
usb: bdc: Halt controller on suspend
GISB bus error kernel panics have been observed during S2 transition
tests on the 7271t platform. The errors are a result of the BDC
interrupt handler trying to access BDC register space after the
system's suspend callbacks have completed.
Adding a suspend hook to the BDC driver that halts the controller before
S2 entry thus preventing unwanted access to the BDC register space during
this transition.
Signed-off-by: Danesh Petigara <danesh.petigara@broadcom.com>
Signed-off-by: Al Cooper <alcooperx@gmail.com>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>
Diffstat (limited to 'drivers/usb/gadget/udc/bdc')
| -rw-r--r-- | drivers/usb/gadget/udc/bdc/bdc_core.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/usb/gadget/udc/bdc/bdc_core.c b/drivers/usb/gadget/udc/bdc/bdc_core.c index d4ec1e37d50a..0f1617e34f38 100644 --- a/drivers/usb/gadget/udc/bdc/bdc_core.c +++ b/drivers/usb/gadget/udc/bdc/bdc_core.c @@ -603,9 +603,14 @@ static int bdc_remove(struct platform_device *pdev) static int bdc_suspend(struct device *dev) { struct bdc *bdc = dev_get_drvdata(dev); + int ret; - clk_disable_unprepare(bdc->clk); - return 0; + /* Halt the controller */ + ret = bdc_stop(bdc); + if (!ret) + clk_disable_unprepare(bdc->clk); + + return ret; } static int bdc_resume(struct device *dev) |