From: Kuninori Morimoto <kuninori.morimoto.gx@xxxxxxxxxxx>
Current mmc block.c has MMC_CAP2_NO_MULTI_READ flag
for HW bug workaround, but it should be implemented
under driver, not framework.
This patch is prepare for it
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@xxxxxxxxxxx>
---
v1 -> v2
- no change
drivers/mmc/card/block.c | 5 +++++
include/linux/mmc/host.h | 4 ++++
2 files changed, 9 insertions(+)
diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
index ede41f0..e946067 100644
--- a/drivers/mmc/card/block.c
+++ b/drivers/mmc/card/block.c
@@ -1402,6 +1402,11 @@ 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 needs workaround */
+ if (card->host->ops->blk_size_workaround)
+ brq->data.blocks = card->host->ops->blk_size_workaround(
+ card, req, brq->data.blocks);
}
if (brq->data.blocks > 1 || do_rel_wr) {
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index 4cbf614..95bd903 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -139,6 +139,10 @@ struct mmc_host_ops {
int (*select_drive_strength)(unsigned int max_dtr, int host_drv, int card_drv);
void (*hw_reset)(struct mmc_host *host);
void (*card_event)(struct mmc_host *host);
+
+ /* optional callback for mmc block HW bug workaround */
+ int (*blk_size_workaround)(struct mmc_card *card,
+ struct request *req, int blk_size);
};
struct mmc_card;
--
1.7.9.5
--
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