usb: dwc3: fix dcache flush range calculation

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 CACHELINE_SIZE.

This causes operation failures Qualcomm platforms.

Take in account the alignment and size of the buffer and also
flush the previous and last cacheline.

Reviewed-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Reviewed-by: Marek Vasut <marex@denx.de>
Link: https://lore.kernel.org/r/20241011-u-boot-dwc3-gadget-dcache-fixup-v4-2-5f3498d8035b@linaro.org
Signed-off-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>

diff --git a/drivers/usb/dwc3/io.h b/drivers/usb/dwc3/io.h
index 04791d4c9be4010de00b37591b835ab6cf6c62a7..0ede323671b4775402c1536c1352bca8bf27f250 100644 (file)
--- 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 & ~(CACHELINE_SIZE - 1);
+       uintptr_t end_addr = ALIGN((uintptr_t)addr + length, CACHELINE_SIZE);
+
+       flush_dcache_range((unsigned long)start_addr, (unsigned long)end_addr);
 }
 #endif /* __DRIVERS_USB_DWC3_IO_H */