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powerpc: Remove arch specific byteswappers from the MXC MMC driver 

When the MXC MMUC driver is used on a Freescale MPC512x machine, it
contains some additional byteswapping code (I'm assuming this is a
workaround for a hardware defect).  This uses the ppc specific st_le32()
function, but there's no reason not to use the generic swab32() function
instead.  gcc is capable of generating the efficient ppc byte-reversing
load/store instructions without the arch-specific helper.

This patch, therefore, switches to the generic byteswap routine.

Cc: Shawn Guo <shawn.guo@linaro.org>
Cc: Sascha Hauer <kernel@pengutronix.de>

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
David Gibson 2015-02-03 16:36:23 +11:00 committed by Benjamin Herrenschmidt
parent c2d5a71064
commit 7a8bf87448
1 changed files with 1 additions and 1 deletions
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2
drivers/mmc/host/mxcmmc.c
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@ -281,7 +281,7 @@ static inline void buffer_swap32(u32 *buf, int len)
int i; int i;
for (i = 0; i < ((len + 3) / 4); i++) { for (i = 0; i < ((len + 3) / 4); i++) {
st_le32(buf, *buf); *buf = swab32(*buf);
buf++; buf++;
} }
} }