Certain SPI controllers may provide accelerated hardware interface to read from m25p80 type flash devices in order to provide better read performance. SPI core supports such devices with spi_flash_read() API. Call spi_flash_read(), if supported, to make use of such interface.
Signed-off-by: Vignesh R <vigne...@ti.com> --- Resend v5: Rebased on top of v4.6-rc1 v5: http://www.spinics.net/lists/devicetree/msg106696.html drivers/mtd/devices/m25p80.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/drivers/mtd/devices/m25p80.c b/drivers/mtd/devices/m25p80.c index c9c3b7fa3051..7730e633d7d3 100644 --- a/drivers/mtd/devices/m25p80.c +++ b/drivers/mtd/devices/m25p80.c @@ -131,6 +131,26 @@ static int m25p80_read(struct spi_nor *nor, loff_t from, size_t len, /* convert the dummy cycles to the number of bytes */ dummy /= 8; + if (spi_flash_read_supported(spi)) { + struct spi_flash_read_message msg; + int ret; + + msg.buf = buf; + msg.from = from; + msg.len = len; + msg.read_opcode = nor->read_opcode; + msg.addr_width = nor->addr_width; + msg.dummy_bytes = dummy; + /* TODO: Support other combinations */ + msg.opcode_nbits = SPI_NBITS_SINGLE; + msg.addr_nbits = SPI_NBITS_SINGLE; + msg.data_nbits = m25p80_rx_nbits(nor); + + ret = spi_flash_read(spi, &msg); + *retlen = msg.retlen; + return ret; + } + spi_message_init(&m); memset(t, 0, (sizeof t)); -- 2.7.4
