On 1/14/12, Matthias Fuchs matthias.fuchs@esd.eu wrote:
The generic spi flash driver (drivers/mtd/spi/spi_flash.c) uses the spi low level driver's spi_xfer() function with len=0 to deassert the SPI flash' chip select. But the i.MX28 spi driver rejects this call due to len=0.
This patch implements an exception for len=0 with the SPI_XFER_END flag set. This results in an extra read with the chip select being deasserted afterwards. There seems to be no way to deassert the signal by hand.
Signed-off-by: Matthias Fuchs matthias.fuchs@esd.eu
Tested-by: Fabio Estevam fabio.estevam@freescale.com
Soldered a SST25VF016B on a mx28evk (and also the SPI pullups) and verified that the flash can be erased succesfully now.
I suggest that this patch gets applied as it fixes a real issue.
Thanks,
Fabio Estevam