* [PATCH 3/6] spi/pl022: disable the PL022 block when unused
@ 2011-11-09 10:39 Linus Walleij
2011-11-09 10:53 ` Viresh Kumar
0 siblings, 1 reply; 2+ messages in thread
From: Linus Walleij @ 2011-11-09 10:39 UTC (permalink / raw)
To: linux-arm-kernel
From: Virupax Sadashivpetimath <virupax.sadashivpetimath@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@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
drivers/spi/spi-pl022.c | 5 +++++
1 files changed, 5 insertions(+), 0 deletions(-)
diff --git a/drivers/spi/spi-pl022.c b/drivers/spi/spi-pl022.c
index 305f2ba..fa3eaae 100644
--- a/drivers/spi/spi-pl022.c
+++ b/drivers/spi/spi-pl022.c
@@ -512,6 +512,11 @@ static void giveback(struct pl022 *pl022)
msg->state = NULL;
if (msg->complete)
msg->complete(msg->context);
+
+ /* 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 clocks & power */
pm_runtime_put(&pl022->adev->dev);
}
--
1.7.3.2
^ permalink raw reply related [flat|nested] 2+ messages in thread
* [PATCH 3/6] spi/pl022: disable the PL022 block when unused
2011-11-09 10:39 [PATCH 3/6] spi/pl022: disable the PL022 block when unused Linus Walleij
@ 2011-11-09 10:53 ` Viresh Kumar
0 siblings, 0 replies; 2+ messages in thread
From: Viresh Kumar @ 2011-11-09 10:53 UTC (permalink / raw)
To: linux-arm-kernel
On 11/9/2011 4:09 PM, Linus WALLEIJ wrote:
> From: Virupax Sadashivpetimath <virupax.sadashivpetimath@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@stericsson.com>
> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
> ---
> drivers/spi/spi-pl022.c | 5 +++++
> 1 files changed, 5 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/spi/spi-pl022.c b/drivers/spi/spi-pl022.c
> index 305f2ba..fa3eaae 100644
> --- a/drivers/spi/spi-pl022.c
> +++ b/drivers/spi/spi-pl022.c
> @@ -512,6 +512,11 @@ static void giveback(struct pl022 *pl022)
> msg->state = NULL;
> if (msg->complete)
> msg->complete(msg->context);
> +
> + /* 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 clocks & power */
> pm_runtime_put(&pl022->adev->dev);
> }
Reviewed-by: Viresh Kumar <viresh.kumar@st.com>
--
viresh
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