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usb: bdc: Halt controller on suspend

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[ Upstream commit 5fc453d7de3d0c345812453823a3a56783c5f82c ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Danesh Petigara 2020-07-22 13:07:45 -04:00 • committed by Greg Kroah-Hartman
commit e1f67b2665
1 changed files with 7 additions and 2 deletions
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9
drivers/usb/gadget/udc/bdc/bdc_core.c
View file

@ -608,9 +608,14 @@ 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)