[PATCH 2/3] spi/pl022: disable the PL022 block when unused
Viresh Kumar
viresh.kumar at st.com
Tue Oct 18 05:13:27 EDT 2011
On 10/17/2011 6:42 PM, Linus WALLEIJ wrote:
> From: Virupax Sadashivpetimath <virupax.sadashivpetimath at stericsson.com>
>
> Make sure we clear the enable bit when the block is not used.
> This will save some energy in certain hardware versions.
>
> Signed-off-by: Virupax Sadashivpetimath <virupax.sadashivpetimath at stericsson.com>
> Signed-off-by: Linus Walleij <linus.walleij at linaro.org>
> ---
> drivers/spi/spi-pl022.c | 7 ++++++-
> 1 files changed, 6 insertions(+), 1 deletions(-)
>
> diff --git a/drivers/spi/spi-pl022.c b/drivers/spi/spi-pl022.c
> index 91700bb..0a1d8ed 100644
> --- a/drivers/spi/spi-pl022.c
> +++ b/drivers/spi/spi-pl022.c
> @@ -513,7 +513,12 @@ static void giveback(struct pl022 *pl022)
> msg->state = NULL;
> if (msg->complete)
> msg->complete(msg->context);
> - /* This message is completed, so let's turn off the clocks & power */
> +
> + /* disable the SPI/SSP operation */
> + writew((readw(SSP_CR1(pl022->virtbase)) &
> + (~SSP_CR1_MASK_SSE)), SSP_CR1(pl022->virtbase));
> +
> + /* This message is completed, so let's turn off the clock! */
> clk_disable(pl022->clk);
> amba_pclk_disable(pl022->adev);
> amba_vcore_disable(pl022->adev);
Reviewed-by: Viresh Kumar <viresh.kumar at st.com>
--
viresh
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