diff options
| author | Jagannadha Sutradharudu Teki <jaganna@xilinx.com> | 2014-01-11 16:50:45 +0530 |
|---|---|---|
| committer | Jagannadha Sutradharudu Teki <jaganna@xilinx.com> | 2014-01-11 16:50:45 +0530 |
| commit | ff063ed4808e4ead3021eaf53ee4fdb80c9e91f8 (patch) | |
| tree | 048ac50a568a8d739a9a8528bbaf7018c27b6aa3 /drivers/mtd/spi/sf_probe.c | |
| parent | c4ba0d82d329791c3f0456d88e93032b11e48535 (diff) | |
sf: Discover read dummy_byte
Discovered the read dummy_byte based on the
configured read command.
Signed-off-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com>
Diffstat (limited to 'drivers/mtd/spi/sf_probe.c')
| -rw-r--r-- | drivers/mtd/spi/sf_probe.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/drivers/mtd/spi/sf_probe.c b/drivers/mtd/spi/sf_probe.c index a049e729a1..8bd06eea62 100644 --- a/drivers/mtd/spi/sf_probe.c +++ b/drivers/mtd/spi/sf_probe.c @@ -140,6 +140,25 @@ static struct spi_flash *spi_flash_validate_params(struct spi_slave *spi, } } + /* Read dummy_byte: dummy byte is determined based on the + * dummy cycles of a particular command. + * Fast commands - dummy_byte = dummy_cycles/8 + * I/O commands- dummy_byte = (dummy_cycles * no.of lines)/8 + * For I/O commands except cmd[0] everything goes on no.of lines + * based on particular command but incase of fast commands except + * data all go on single line irrespective of command. + */ + switch (flash->read_cmd) { + case CMD_READ_QUAD_IO_FAST: + flash->dummy_byte = 2; + break; + case CMD_READ_ARRAY_SLOW: + flash->dummy_byte = 0; + break; + default: + flash->dummy_byte = 1; + } + /* Poll cmd seclection */ flash->poll_cmd = CMD_READ_STATUS; #ifdef CONFIG_SPI_FLASH_STMICRO |