From: Mateusz Nowak <mateusz.nowak@xxxxxxxxx>
Fixes: ca369d51b3e1 ("block/sd: Fix device-imposed transfer length limits")
introduced max_dev_sectors as upper limit for max_hw_sectors. This caused
limitation of maximum block size to default max_dev_sectors value - 127,
causing performance degradation with higher block sizes.
This patch is overriding max_dev_sectors value, so it will be set to
maximum possible value to be used with set block count command,
so 0xffff for eMMC cards, and 0xffffffff for SD cards.
Fixes: ca369d51b3e1 ("block/sd: Fix device-imposed transfer length limits")
Cc: linux-mmc@xxxxxxxxxxxxxxx
Signed-off-by: Mateusz Nowak <mateusz.nowak@xxxxxxxxx>
---
drivers/mmc/card/queue.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/drivers/mmc/card/queue.c b/drivers/mmc/card/queue.c
index 6f4323c6d653..9175b8cd54de 100644
--- a/drivers/mmc/card/queue.c
+++ b/drivers/mmc/card/queue.c
@@ -212,6 +212,16 @@ int mmc_init_queue(struct mmc_queue *mq, struct mmc_card *card,
if (mmc_can_erase(card))
mmc_queue_setup_discard(mq->queue, card);
+ /*
+ * Set maximum block count accepted by the card.
+ * For eMMC, this can be 16 bit value,
+ * for SD, this can be 32 bit value
+ */
+ if (mmc_card_mmc(card))
+ blk_queue_max_dev_sectors(mq->queue, 0xffff);
+ else if (mmc_card_sd(card))
+ blk_queue_max_dev_sectors(mq->queue, 0xffffffff);
+
#ifdef CONFIG_MMC_BLOCK_BOUNCE
if (host->max_segs == 1) {
unsigned int bouncesz;
--
1.9.1
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