[U-Boot] [PATCH 4/4] musb_core.h: Add a new USB_DMA_MINALIGN define for cache alignment

[Tom Rini]

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 at denx.de>
Signed-off-by: Tom Rini <trini at 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
 
 /*
-- 
1.7.9.5