[PATCH linux dev-4.7 6/8] mtd: spi-nor: aspeed: prepare for fast read

[Joel Stanley]

On Sat, Nov 5, 2016 at 3:30 AM, Cédric Le Goater <clg at kaod.org> wrote:
> Include dummy cycle in the control register value which will be
> required for fast read.
>
> Signed-off-by: Cédric Le Goater <clg at kaod.org>
> ---
>  drivers/mtd/spi-nor/aspeed-smc.c | 41 +++++++++++++++++++++++++++++++++++-----
>  1 file changed, 36 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/mtd/spi-nor/aspeed-smc.c b/drivers/mtd/spi-nor/aspeed-smc.c
> index 73adf409ac34..444af3aff8b5 100644
> --- a/drivers/mtd/spi-nor/aspeed-smc.c
> +++ b/drivers/mtd/spi-nor/aspeed-smc.c

> @@ -304,6 +304,10 @@ struct aspeed_smc_controller {
>                                        CONTROL_SPI_IO_DUMMY_CYCLES_LO_SHIFT)
>  #define CONTROL_SPI_IO_DUMMY_CYCLES_MASK (CONTROL_SPI_IO_DUMMY_CYCLES_HI | \
>                                           CONTROL_SPI_IO_DUMMY_CYCLES_LO)
> +#define CONTROL_SPI_IO_DUMMY_CYCLES_SET(dummy)                         \
> +       (((((dummy) >> 2) & 0x1) << CONTROL_SPI_IO_DUMMY_CYCLES_HI_SHIFT) | \
> +       (((dummy) & 0x3) << CONTROL_SPI_IO_DUMMY_CYCLES_LO_SHIFT))
> +

This is a bit hairy.

Aside from that,

Reviewed-by: Joel Stanley <joel at jms.id.au>

Cheers,

Joel