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authorYogesh Gaur <yogeshnarayan.gaur@nxp.com>2018-06-13 11:39:18 +0530
committerBoris Brezillon <boris.brezillon@bootlin.com>2018-10-08 21:28:27 +0200
commit3baa8ec88c2feb902328e59a4dcf0f0aaab7d2ff (patch)
tree93335a4c7dc4347f0d4fec6228a1e2f2656273b0 /drivers/mtd
parent630d6bd8a3b4964e8a4ccced97f7f1819c92b588 (diff)
downloadlinux-3baa8ec88c2feb902328e59a4dcf0f0aaab7d2ff.tar.bz2
mtd: devices: m25p80: Make sure WRITE_EN is issued before each write
Some SPI controllers can't write nor->page_size bytes in a single step because their TX FIFO is too small, but when that happens we should make sure a WRITE_EN command before each write access and READ_SR command after each write access is issued. The core is already taking care of that, so all we have to do here is return the actual number of bytes that were written during the spi_mem_exec_op() operation. Signed-off-by: Yogesh Gaur <yogeshnarayan.gaur@nxp.com> Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
Diffstat (limited to 'drivers/mtd')
-rw-r--r--drivers/mtd/devices/m25p80.c23
1 files changed, 8 insertions, 15 deletions
diff --git a/drivers/mtd/devices/m25p80.c b/drivers/mtd/devices/m25p80.c
index cbfafc453274..cb14cf985b95 100644
--- a/drivers/mtd/devices/m25p80.c
+++ b/drivers/mtd/devices/m25p80.c
@@ -70,7 +70,6 @@ static ssize_t m25p80_write(struct spi_nor *nor, loff_t to, size_t len,
SPI_MEM_OP_ADDR(nor->addr_width, to, 1),
SPI_MEM_OP_NO_DUMMY,
SPI_MEM_OP_DATA_OUT(len, buf, 1));
- size_t remaining = len;
int ret;
/* get transfer protocols. */
@@ -81,22 +80,16 @@ static ssize_t m25p80_write(struct spi_nor *nor, loff_t to, size_t len,
if (nor->program_opcode == SPINOR_OP_AAI_WP && nor->sst_write_second)
op.addr.nbytes = 0;
- while (remaining) {
- op.data.nbytes = remaining < UINT_MAX ? remaining : UINT_MAX;
- ret = spi_mem_adjust_op_size(flash->spimem, &op);
- if (ret)
- return ret;
-
- ret = spi_mem_exec_op(flash->spimem, &op);
- if (ret)
- return ret;
+ ret = spi_mem_adjust_op_size(flash->spimem, &op);
+ if (ret)
+ return ret;
+ op.data.nbytes = len < op.data.nbytes ? len : op.data.nbytes;
- op.addr.val += op.data.nbytes;
- remaining -= op.data.nbytes;
- op.data.buf.out += op.data.nbytes;
- }
+ ret = spi_mem_exec_op(flash->spimem, &op);
+ if (ret)
+ return ret;
- return len;
+ return op.data.nbytes;
}
/*