[PATCH RFC 50/51] ARM: 7797/1: mmc: Use dma_max_pfn(dev) helper for bounce_limit calculations
From: Santosh Shilimkar <hidden>
Date: 2013-08-01 22:24:42
Also in:
lkml
Subsystem:
multimedia card (mmc), secure digital (sd) and sdio subsystem, the rest · Maintainers:
Ulf Hansson, Linus Torvalds
DMA bounce limit is the maximum direct DMA'able memory beyond which bounce buffers has to be used to perform dma operations. MMC queue layr relies on dma_mask but its calculation is based on max_*pfn which don't have uniform meaning across architectures. So make use of dma_max_pfn() which is expected to return the DMAable maximum pfn value across architectures. Signed-off-by: Santosh Shilimkar <redacted> Signed-off-by: Russell King <redacted> --- drivers/mmc/card/queue.c | 3 ++- 1 files changed, 2 insertions(+), 1 deletions(-)
diff --git a/drivers/mmc/card/queue.c b/drivers/mmc/card/queue.c
index fa9632e..357bbc5 100644
--- a/drivers/mmc/card/queue.c
+++ b/drivers/mmc/card/queue.c@@ -15,6 +15,7 @@ #include <linux/freezer.h> #include <linux/kthread.h> #include <linux/scatterlist.h> +#include <linux/dma-mapping.h> #include <linux/mmc/card.h> #include <linux/mmc/host.h>
@@ -196,7 +197,7 @@ int mmc_init_queue(struct mmc_queue *mq, struct mmc_card *card, struct mmc_queue_req *mqrq_prev = &mq->mqrq[1]; if (mmc_dev(host)->dma_mask && *mmc_dev(host)->dma_mask) - limit = *mmc_dev(host)->dma_mask; + limit = dma_max_pfn(mmc_dev(host)) << PAGE_SHIFT; mq->card = card; mq->queue = blk_init_queue(mmc_request_fn, lock);
--
1.7.4.4