[PATCH 1/1] mmc: Set optimal I/O size when mmc_setip_queue

[Sharp.Xia]

From: Sharp Xia <Sharp.Xia@xxxxxxxxxxxx>

MMC does not set readahead and uses the default VM_READAHEAD_PAGES
resulting in slower reading speed.
Use the max_req_size reported by host driver to set the optimal
I/O size to improve performance.

Signed-off-by: Sharp Xia <Sharp.Xia@xxxxxxxxxxxx>
---
 drivers/mmc/core/queue.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/mmc/core/queue.c b/drivers/mmc/core/queue.c
index b396e3900717..fc83c4917360 100644
--- a/drivers/mmc/core/queue.c
+++ b/drivers/mmc/core/queue.c
@@ -359,6 +359,7 @@ static void mmc_setup_queue(struct mmc_queue *mq, struct mmc_card *card)
 		blk_queue_bounce_limit(mq->queue, BLK_BOUNCE_HIGH);
 	blk_queue_max_hw_sectors(mq->queue,
 		min(host->max_blk_count, host->max_req_size / 512));
+	blk_queue_io_opt(mq->queue, host->max_req_size);
 	if (host->can_dma_map_merge)
 		WARN(!blk_queue_can_use_dma_map_merging(mq->queue,
 							mmc_dev(host)),
-- 
2.18.0