From 568262bf5492a9bb2fcc4c204b8d38fd6be64e28 Mon Sep 17 00:00:00 2001 From: Sandeep Maheswaram Date: Wed, 14 Apr 2021 11:33:29 +0530 Subject: [PATCH] usb: dwc3: core: Add shutdown callback for dwc3 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 Signed-off-by: Sandeep Maheswaram Link: https://lore.kernel.org/r/1618380209-20114-1-git-send-email-sanm@codeaurora.org Signed-off-by: Greg Kroah-Hartman --- drivers/usb/dwc3/core.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c index 05e2e54cbbdc09..2022d90443c8bc 100644 --- a/drivers/usb/dwc3/core.c +++ b/drivers/usb/dwc3/core.c @@ -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),