diff mbox

[1/7] mmc: add blk_size_workaround for HW bug

Message ID 87ppffzog7.wl%kuninori.morimoto.gx@gmail.com (mailing list archive)
State Superseded
Headers show

Commit Message

Kuninori Morimoto Sept. 1, 2014, 9:20 a.m. UTC 
From: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>

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@renesas.com>
---
 drivers/mmc/card/block.c |    5 +++++
 include/linux/mmc/host.h |    4 ++++
 2 files changed, 9 insertions(+)
diff mbox

Patch

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;