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usb: dwc3: core: Add shutdown callback for dwc3

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This patch adds a shutdown callback to USB DWC core driver to ensure that
it is properly shutdown in reboot/shutdown path. This is required
where SMMU address translation is enabled like on SC7180
SoC and few others. If the hardware is still accessing memory after
SMMU translation is disabled as part of SMMU shutdown callback in
system reboot or shutdown path, then IOVAs(I/O virtual address)
which it was using will go on the bus as the physical addresses which
might result in unknown crashes (NoC/interconnect errors).

Acked-by: Felipe Balbi <balbi@kernel.org>
Signed-off-by: Sandeep Maheswaram <sanm@codeaurora.org>
Link: https://lore.kernel.org/r/1618380209-20114-1-git-send-email-sanm@codeaurora.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sandeep Maheswaram 2021-04-14 11:33:29 +05:30 committed by Greg Kroah-Hartman
parent e66bbfb0fb
commit 568262bf54
1 changed files with 6 additions and 0 deletions
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6
drivers/usb/dwc3/core.c
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@ -1658,6 +1658,11 @@ static int dwc3_remove(struct platform_device *pdev)
return 0;
}
static void dwc3_shutdown(struct platform_device *pdev)
{
dwc3_remove(pdev);
}
#ifdef CONFIG_PM
static int dwc3_core_init_for_resume(struct dwc3 *dwc)
{
@ -1975,6 +1980,7 @@ MODULE_DEVICE_TABLE(acpi, dwc3_acpi_match);
static struct platform_driver dwc3_driver = {
.probe = dwc3_probe,
.remove = dwc3_remove,
.shutdown = dwc3_shutdown,
.driver = {
.name = "dwc3",
.of_match_table = of_match_ptr(of_dwc3_match),