On Thu, Apr 26, 2012 at 23:10:36, J, KEERTHY wrote:
> From: Jean Pihet <j-pihet@xxxxxx>
>
> Now that omap_test_timeout is only accessible from mach-omap2/,
> introduce a similar function for SR.
>
> This change makes the SmartReflex implementation ready for the move
> to drivers/.
>
> Signed-off-by: Jean Pihet <j-pihet@xxxxxx>
> Signed-off-by: J Keerthy <j-keerthy@xxxxxx>
> ---
> arch/arm/mach-omap2/smartreflex.c | 12 ++++++------
> include/linux/power/smartreflex.h | 23 ++++++++++++++++++++++-
> 2 files changed, 28 insertions(+), 7 deletions(-)
>
> diff --git a/arch/arm/mach-omap2/smartreflex.c b/arch/arm/mach-omap2/smartreflex.c
> index d859277..acef08d 100644
> --- a/arch/arm/mach-omap2/smartreflex.c
> +++ b/arch/arm/mach-omap2/smartreflex.c
> @@ -289,9 +289,9 @@ static void sr_v1_disable(struct omap_sr *sr)
> * Wait for SR to be disabled.
> * wait until ERRCONFIG.MCUDISACKINTST = 1. Typical latency is 1us.
> */
> - omap_test_timeout((sr_read_reg(sr, ERRCONFIG_V1) &
> - ERRCONFIG_MCUDISACKINTST), SR_DISABLE_TIMEOUT,
> - timeout);
> + sr_test_cond_timeout((sr_read_reg(sr, ERRCONFIG_V1) &
> + ERRCONFIG_MCUDISACKINTST), SR_DISABLE_TIMEOUT,
> + timeout);
>
> if (timeout >= SR_DISABLE_TIMEOUT)
> dev_warn(&sr->pdev->dev, "%s: Smartreflex disable timedout\n",
> @@ -334,9 +334,9 @@ static void sr_v2_disable(struct omap_sr *sr)
> * Wait for SR to be disabled.
> * wait until IRQSTATUS.MCUDISACKINTST = 1. Typical latency is 1us.
> */
> - omap_test_timeout((sr_read_reg(sr, IRQSTATUS) &
> - IRQSTATUS_MCUDISABLEACKINT), SR_DISABLE_TIMEOUT,
> - timeout);
> + sr_test_cond_timeout((sr_read_reg(sr, IRQSTATUS) &
> + IRQSTATUS_MCUDISABLEACKINT), SR_DISABLE_TIMEOUT,
> + timeout);
>
> if (timeout >= SR_DISABLE_TIMEOUT)
> dev_warn(&sr->pdev->dev, "%s: Smartreflex disable timedout\n",
> diff --git a/include/linux/power/smartreflex.h b/include/linux/power/smartreflex.h
> index 884eaee..78b795e 100644
> --- a/include/linux/power/smartreflex.h
> +++ b/include/linux/power/smartreflex.h
> @@ -22,7 +22,7 @@
>
> #include <linux/types.h>
> #include <linux/platform_device.h>
> -
> +#include <linux/delay.h>
> #include <plat/voltage.h>
>
> /*
> @@ -168,6 +168,27 @@ struct omap_sr {
> };
>
> /**
> + * test_cond_timeout - busy-loop, testing a condition
> + * @cond: condition to test until it evaluates to true
> + * @timeout: maximum number of microseconds in the timeout
> + * @index: loop index (integer)
> + *
> + * Loop waiting for @cond to become true or until at least @timeout
> + * microseconds have passed. To use, define some integer @index in the
> + * calling code. After running, if @index == @timeout, then the loop has
> + * timed out.
> + *
> + * Copied from omap_test_timeout */
> +#define sr_test_cond_timeout(cond, timeout, index) \
> +({ \
> + for (index = 0; index < timeout; index++) { \
> + if (cond) \
> + break; \
> + udelay(1); \
> + } \
> +})
I think we can use time_after()/time_before() APIs for timeout and cpu_relax() for
tight loops instead of udelay().
Regards
AnilKumar
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