• Gabor Juhos's avatar
    spi/ath79: add shutdown handler · 7410e848
    Gabor Juhos authored
    The SPI controller of the AR7xxx/AR9xxx SoCs
    have a special mode which allows the SoC to
    directly read data from SPI flash chips. In
    this mode, the content of the SPI flash chip
    can be accessed via a memory mapped region.
    During early init time, the kernel expects
    that the flash chip is accessible through
    that memory region because it reads board
    specific values (e.g. MAC address, WiFi
    calibration data) from the flash on various
    This is working if the kernel is loaded
    directly by the bootloader because that
    leaves the SPI controller in the special
    mode. However it is not working in a kexec'd
    kernel because the SPI driver does not restore
    the special mode during shutdown.
    The patch adds a shutdown handler to fix this
    Signed-off-by: default avatarGabor Juhos <juhosg@openwrt.org>
    Signed-off-by: default avatarGrant Likely <grant.likely@secretlab.ca>
spi-ath79.c 7.34 KB