On Tue, 5 Feb 2013 20:57:55 +0100, Gabor Juhos <juh...@openwrt.org> wrote:
> 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
> boards.
>
> 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
> issue.
>
> Signed-off-by: Gabor Juhos <juh...@openwrt.org>
Applied, thanks.
g.
> ---
> Changes since v1:
> - call ath79_spi_remote(pdev) directly from ath79_spi_shutdown()
> ---
> drivers/spi/spi-ath79.c | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> diff --git a/drivers/spi/spi-ath79.c b/drivers/spi/spi-ath79.c
> index 842acd8..e504b76 100644
> --- a/drivers/spi/spi-ath79.c
> +++ b/drivers/spi/spi-ath79.c
> @@ -308,9 +308,15 @@ static int ath79_spi_remove(struct platform_device *pdev)
> return 0;
> }
>
> +static void ath79_spi_shutdown(struct platform_device *pdev)
> +{
> + ath79_spi_remove(pdev);
> +}
> +
> static struct platform_driver ath79_spi_driver = {
> .probe = ath79_spi_probe,
> .remove = ath79_spi_remove,
> + .shutdown = ath79_spi_shutdown,
> .driver = {
> .name = DRV_NAME,
> .owner = THIS_MODULE,
> --
> 1.7.10
>
--
Grant Likely, B.Sc, P.Eng.
Secret Lab Technologies, Ltd.
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