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authorKuninori Morimoto <kuninori.morimoto.gx@renesas.com>2014-09-02 19:08:53 -0700
committerUlf Hansson <ulf.hansson@linaro.org>2014-09-09 13:59:25 +0200
commit2e47e84245adcb1b3872210678b6146f674fb3ff (patch)
tree0ab356fa3d0d079a855ed65e5b51326328738e99 /drivers
parentadc828556dfc3f87a5c1338fc5412cbec3c0b529 (diff)
mmc: Add .multi_io_quirk callback for multi I/O HW bug
Historically, we have been using MMC_CAP* to handle host HW issues and currently the block layer uses MMC_CAP2_NO_MULTI_READ flag for a multi I/O HW bug workaround. There are a few tweaks needed to make MMC_CAP2_NO_MULTI_READ suite all situations. Therefore let's add an optional host ops callback to enable host drivers to return the number of blocks it allows per request. In a future patch and when host drivers have converted to the new callback, MMC_CAP2_NO_MULTI_READ shall be removed. Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/mmc/card/block.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
index ede41f05c392..adab9038f6f7 100644
--- a/drivers/mmc/card/block.c
+++ b/drivers/mmc/card/block.c
@@ -1402,6 +1402,16 @@ static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
if (card->host->caps2 & MMC_CAP2_NO_MULTI_READ &&
rq_data_dir(req) == READ)
brq->data.blocks = 1;
+
+ /*
+ * Some controllers have HW issues while operating
+ * in multiple I/O mode
+ */
+ if (card->host->ops->multi_io_quirk)
+ brq->data.blocks = card->host->ops->multi_io_quirk(card,
+ (rq_data_dir(req) == READ) ?
+ MMC_DATA_READ : MMC_DATA_WRITE,
+ brq->data.blocks);
}
if (brq->data.blocks > 1 || do_rel_wr) {