From: Neil Armstrong Date: Fri, 11 Oct 2024 14:38:26 +0000 (+0200) Subject: usb: dwc3: invalidate dcache on buffer used in interrupt handling X-Git-Url: http://git.dujemihanovic.xyz/html/index.html?a=commitdiff_plain;h=9214627f5ecede8610e33abf2de5a0083f3f80ce;p=u-boot.git usb: dwc3: invalidate dcache on buffer used in interrupt handling On Qualcomm systems, the setup buffer and even buffers are in a bad state at interrupt handling, so invalidate the dcache lines for the setup_buf and event buffer to make sure we read correct data written by the hardware. This fixes the following error: dwc3-generic-peripheral usb@a600000: UNKNOWN IRQ type -1 dwc3-generic-peripheral usb@a600000: UNKNOWN IRQ type 4673109 and invalid situation in dwc3_gadget_giveback() because setup_buf content is read at 0s and leads to fatal crash fixed by [1]. [1] https://lore.kernel.org/all/20240528-topic-sm8x50-dwc3-gadget-crash-fix-v1-1-58434ab4b3d3@linaro.org/ Reviewed-by: Mattijs Korpershoek Signed-off-by: Neil Armstrong Reviewed-by: Marek Vasut --- diff --git a/drivers/usb/dwc3/ep0.c b/drivers/usb/dwc3/ep0.c index 8ba5fcd531..531f0b522a 100644 --- a/drivers/usb/dwc3/ep0.c +++ b/drivers/usb/dwc3/ep0.c @@ -742,6 +742,8 @@ static void dwc3_ep0_inspect_setup(struct dwc3 *dwc, if (!dwc->gadget_driver) goto out; + dwc3_invalidate_cache((uintptr_t)ctrl, sizeof(*ctrl)); + len = le16_to_cpu(ctrl->wLength); if (!len) { dwc->three_stage_setup = false; diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c index 19c3a5f5e5..e5a383407a 100644 --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -2534,6 +2534,8 @@ static irqreturn_t dwc3_process_event_buf(struct dwc3 *dwc, u32 buf) while (left > 0) { union dwc3_event event; + dwc3_invalidate_cache((uintptr_t)evt->buf, evt->length); + event.raw = *(u32 *) (evt->buf + evt->lpos); dwc3_process_event_entry(dwc, &event); diff --git a/drivers/usb/dwc3/io.h b/drivers/usb/dwc3/io.h index 0ede323671..c1ab028814 100644 --- a/drivers/usb/dwc3/io.h +++ b/drivers/usb/dwc3/io.h @@ -55,4 +55,12 @@ static inline void dwc3_flush_cache(uintptr_t addr, int length) flush_dcache_range((unsigned long)start_addr, (unsigned long)end_addr); } + +static inline void dwc3_invalidate_cache(uintptr_t addr, int length) +{ + uintptr_t start_addr = (uintptr_t)addr & ~(CACHELINE_SIZE - 1); + uintptr_t end_addr = ALIGN((uintptr_t)addr + length, CACHELINE_SIZE); + + invalidate_dcache_range((unsigned long)start_addr, (unsigned long)end_addr); +} #endif /* __DRIVERS_USB_DWC3_IO_H */