From: Geert Uytterhoeven <[email protected]>
When using the Quad Read opcode, SPI masters still use Single SPI
transfers, as spi_transfer.rx_nbits defaults to SPI_NBITS_SINGLE.
Use SPI_NBITS_QUAD to fix this.
While an earlier version of commit 3487a63955c34ea508bcf4ca5131ddd953876e2d
("drivers: mtd: m25p80: add quad read support") did this correctly, it was
forgotten in the version that got merged.
Signed-off-by: Geert Uytterhoeven <[email protected]>
---
drivers/mtd/devices/m25p80.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/drivers/mtd/devices/m25p80.c b/drivers/mtd/devices/m25p80.c
index 320c6a308630..ad1913909702 100644
--- a/drivers/mtd/devices/m25p80.c
+++ b/drivers/mtd/devices/m25p80.c
@@ -489,6 +489,16 @@ static inline int m25p80_dummy_cycles_read(struct m25p
*flash)
}
}
+static inline unsigned int m25p80_rx_nbits(const struct m25p *flash)
+{
+ switch (flash->flash_read) {
+ case M25P80_QUAD:
+ return 4;
+ default:
+ return 0;
+ }
+}
+
/*
* Read an address range from the flash chip. The address range
* may be any size provided it is within the physical boundaries.
@@ -519,6 +529,7 @@ static int m25p80_read(struct mtd_info *mtd, loff_t from,
size_t len,
spi_message_add_tail(&t[0], &m);
t[1].rx_buf = buf;
+ t[1].rx_nbits = m25p80_rx_nbits(flash);
t[1].len = len;
spi_message_add_tail(&t[1], &m);
--
1.7.9.5
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