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mmc: rmobile: add a compiler barrier

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Building w/ GCC v5.2, the SD card access is broken due to invalid data
in the response command reconstructed at the end of
sh_sdhci_get_response().

Add a memory barrier between the two main steps of this function to
ensure the resp[] table content is consistent before bits reordering.

This fix has been tested Ok on Porter board rev1.0 using v2016.03
release.

Signed-off-by: Yannick Gicquel <yannick.gicquel@iot.bzh>
This commit is contained in:
Yannick Gicquel 2016-04-04 11:49:59 +02:00 • committed by Nobuhiro Iwamatsu
parent 4ebaba55a4
commit 7593194685
1 changed files with 3 additions and 0 deletions
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3
drivers/mmc/sh_sdhi.c
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@ -430,6 +430,9 @@ static void sh_sdhi_get_response(struct sh_sdhi_host *host, struct mmc_cmd *cmd)
}
p2 = (unsigned long *)cmd->response;
barrier();
#if defined(__BIG_ENDIAN_BITFIELD)
for (i = 0; i < cnt; i++) {
*p2++ = ((*p1 >> 16) & 0x0000ffff) |