Messages in this thread Patch in this message | | | From | Al Cooper <> | Subject | [PATCH 6/7] usb: bdc: Halt controller on suspend | Date | Fri, 17 Jul 2020 11:23:06 -0400 |
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From: Danesh Petigara <danesh.petigara@broadcom.com>
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> Signed-off-by: Florian Fainelli <florian.fainelli@broadcom.com> --- drivers/usb/gadget/udc/bdc/bdc_core.c | 9 +++++++-- 1 file 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 47bcc9f6afbd..ac989adefe9d 100644 --- a/drivers/usb/gadget/udc/bdc/bdc_core.c +++ b/drivers/usb/gadget/udc/bdc/bdc_core.c @@ -607,9 +607,14 @@ 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) -- 2.17.1
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