The current flush operation will omit doing a flush/invalidate on the first and last bytes if the base address and size are not aligned with DMA_MINALIGN.
This causes operation failures Qualcomm platforms.
Take in account the alignment and size of the buffer and also flush the previous and last cacheline.
Signed-off-by: Neil Armstrong neil.armstrong@linaro.org --- drivers/usb/dwc3/io.h | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/dwc3/io.h b/drivers/usb/dwc3/io.h index 04791d4c9be..1aaf5413c6d 100644 --- a/drivers/usb/dwc3/io.h +++ b/drivers/usb/dwc3/io.h @@ -50,6 +50,9 @@ static inline void dwc3_writel(void __iomem *base, u32 offset, u32 value)
static inline void dwc3_flush_cache(uintptr_t addr, int length) { - flush_dcache_range(addr, addr + ROUND(length, CACHELINE_SIZE)); + uintptr_t start_addr = (uintptr_t)addr & ~(ARCH_DMA_MINALIGN - 1); + uintptr_t end_addr = ALIGN((uintptr_t)addr + length, ARCH_DMA_MINALIGN); + + flush_dcache_range(start_addr, end_addr); } #endif /* __DRIVERS_USB_DWC3_IO_H */