The USB spec says that 32 bytes is the minimum required alignment. However on some platforms we have a larger minimum requirement for cache coherency. In those cases, use that value rather than the USB spec minimum.
Cc: Marek Vasut marex@denx.de Signed-off-by: Tom Rini trini@ti.com --- drivers/usb/musb/musb_core.h | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/musb/musb_core.h b/drivers/usb/musb/musb_core.h index a8adcce..bd1ad82 100644 --- a/drivers/usb/musb/musb_core.h +++ b/drivers/usb/musb/musb_core.h @@ -74,6 +74,16 @@ struct musb_epN_regs { u8 fifosize; };
+/* + * The EHCI spec says that we must align to at least 32 bytes. However, + * some platforms require larger alignment. + */ +#if ARCH_DMA_MINALIGN > 32 +#define USB_DMA_MINALIGN ARCH_DMA_MINALIGN +#else +#define USB_DMA_MINALIGN 32 +#endif + /* Mentor USB core register overlay structure */ #ifndef musb_regs struct musb_regs { @@ -145,7 +155,7 @@ struct musb_regs { struct musb_epN_regs epN; } ep[16];
-} __attribute__((packed, aligned(32))); +} __attribute__((packed, aligned(USB_DMA_MINALIGN))); #endif
/*