diff mbox

[v3,4/6] mtd: nand: omap2: Start dma request before enabling prefetch

Message ID 1457582861-20619-5-git-send-email-fcooper@ti.com (mailing list archive)
State New, archived
Headers show

Commit Message

Franklin Cooper March 10, 2016, 4:07 a.m. UTC
The prefetch engine sends a dma request once a FIFO threshold has
been met. No other requests are received until the previous request
is handled.

Starting an edma transfer (dma_async_issue_pending) results in any
previous event for the dma channel to be cleared. Therefore, starting
the prefetch engine before initiating the dma transfer may result in
the prefetch triggering a dma request but instead of it being handled
it can end up being cleared. This will result in a hang since the code
will continue to wait for the dma request to complete.

By initiating the dma request before enabling the prefetch engine this
race condition is avoided and no dma request are missed/cleared.

Signed-off-by: Franklin S Cooper Jr <fcooper@ti.com>
---
 drivers/mtd/nand/omap2.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)
diff mbox

Patch

diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
index 1e5c803..f7110d1 100644
--- a/drivers/mtd/nand/omap2.c
+++ b/drivers/mtd/nand/omap2.c
@@ -497,6 +497,11 @@  static inline int omap_nand_dma_transfer(struct mtd_info *mtd, void *addr,
 	tx->callback_param = &info->comp;
 	dmaengine_submit(tx);
 
+	init_completion(&info->comp);
+
+	/* setup and start DMA using dma_addr */
+	dma_async_issue_pending(info->dma);
+
 	/*  configure and start prefetch transfer */
 	ret = omap_prefetch_enable(info->gpmc_cs,
 		PREFETCH_FIFOTHRESHOLD_MAX, 0x1, len, is_write, info);
@@ -504,10 +509,6 @@  static inline int omap_nand_dma_transfer(struct mtd_info *mtd, void *addr,
 		/* PFPW engine is busy, use cpu copy method */
 		goto out_copy_unmap;
 
-	init_completion(&info->comp);
-	dma_async_issue_pending(info->dma);
-
-	/* setup and start DMA using dma_addr */
 	wait_for_completion(&info->comp);
 	tim = 0;
 	limit = (loops_per_jiffy * msecs_to_jiffies(OMAP_NAND_TIMEOUT_MS));