From ac5cce38de8f97a120b8c98f34be0d5eec50a6fb Mon Sep 17 00:00:00 2001
From: "Poddar, Sourav" <sourav.poddar@ti.com>
Date: Thu, 14 Nov 2013 21:01:15 +0530
Subject: [PATCH] driver: mtd: sf_ops: claim bus while doing memcpy
claim spi bus while doing memory copy, this will set up
the spi controller device control register before doing
a memory read.
Signed-off-by: Sourav Poddar <sourav.poddar@ti.com>
Tested-by: Yebio Mesfin <ymesfin@ti.com>
Reviewed-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com>
---
drivers/mtd/spi/sf_ops.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/mtd/spi/sf_ops.c b/drivers/mtd/spi/sf_ops.c
index 108665f4415..e316a692a8d 100644
--- a/drivers/mtd/spi/sf_ops.c
+++ b/drivers/mtd/spi/sf_ops.c
@@ -273,9 +273,15 @@ int spi_flash_cmd_read_ops(struct spi_flash *flash, u32 offset,
/* Handle memory-mapped SPI */
if (flash->memory_map) {
+ ret = spi_claim_bus(flash->spi);
+ if (ret) {
+ debug("SF: unable to claim SPI bus\n");
+ return ret;
+ }
spi_xfer(flash->spi, 0, NULL, NULL, SPI_XFER_MMAP);
memcpy(data, flash->memory_map + offset, len);
spi_xfer(flash->spi, 0, NULL, NULL, SPI_XFER_MMAP_END);
+ spi_release_bus(flash->spi);
return 0;
}
--
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