2014-12-05 09:58:09

by Jingchang Lu

Subject: [PATCH] arm: ls1021a: setup hrtimer based tick broadcast

This adds setup of hrtimer based tick broadcast to utilize
the hrtimer in SMP without other broadcast tick devices.

Signed-off-by: Jingchang Lu <[email protected]>
---
arch/arm/mach-imx/mach-ls1021a.c | 12 ++++++++++++
1 file changed, 12 insertions(+)

diff --git a/arch/arm/mach-imx/mach-ls1021a.c b/arch/arm/mach-imx/mach-ls1021a.c
index b89c858..4d074cf 100644
--- a/arch/arm/mach-imx/mach-ls1021a.c
+++ b/arch/arm/mach-imx/mach-ls1021a.c
@@ -7,6 +7,10 @@
* (at your option) any later version.
*/

+#include <linux/clockchips.h>
+#include <linux/clk-provider.h>
+#include <linux/clocksource.h>
+
#include <asm/mach/arch.h>

#include "common.h"
@@ -16,7 +20,15 @@ static const char * const ls1021a_dt_compat[] __initconst = {
NULL,
};

+static void __init ls1021a_init_time(void)
+{
+ of_clk_init(NULL);
+ clocksource_of_init();
+ tick_setup_hrtimer_broadcast();
+}
+
DT_MACHINE_START(LS1021A, "Freescale LS1021A")
.smp = smp_ops(ls1021a_smp_ops),
+ .init_time = ls1021a_init_time,
.dt_compat = ls1021a_dt_compat,
MACHINE_END
--
1.8.0

2014-12-05 10:27:54

by Mark Rutland

Subject: Re: [PATCH] arm: ls1021a: setup hrtimer based tick broadcast

Hi,

On Fri, Dec 05, 2014 at 09:07:29AM +0000, Jingchang Lu wrote:
> This adds setup of hrtimer based tick broadcast to utilize
> the hrtimer in SMP without other broadcast tick devices.
>
> Signed-off-by: Jingchang Lu <[email protected]>

This shouldn't live in board code.

Similarly to what happens with the generic dummy timer on all arches
that select it (and the broadcast hrtimer on all arches that use it so
far), we should just unconditionally register the broadcast hrtimer.

A real broadcast-capable clock event device will take preference if
present, so we don't need to add board-specific code to only register
this in certain conditions.

Mark.

> ---
> arch/arm/mach-imx/mach-ls1021a.c | 12 ++++++++++++
> 1 file changed, 12 insertions(+)
>
> diff --git a/arch/arm/mach-imx/mach-ls1021a.c b/arch/arm/mach-imx/mach-ls1021a.c
> index b89c858..4d074cf 100644
> --- a/arch/arm/mach-imx/mach-ls1021a.c
> +++ b/arch/arm/mach-imx/mach-ls1021a.c
> @@ -7,6 +7,10 @@
> * (at your option) any later version.
> */
>
> +#include <linux/clockchips.h>
> +#include <linux/clk-provider.h>
> +#include <linux/clocksource.h>
> +
> #include <asm/mach/arch.h>
>
> #include "common.h"
> @@ -16,7 +20,15 @@ static const char * const ls1021a_dt_compat[] __initconst = {
> NULL,
> };
>
> +static void __init ls1021a_init_time(void)
> +{
> + of_clk_init(NULL);
> + clocksource_of_init();
> + tick_setup_hrtimer_broadcast();
> +}
> +
> DT_MACHINE_START(LS1021A, "Freescale LS1021A")
> .smp = smp_ops(ls1021a_smp_ops),
> + .init_time = ls1021a_init_time,
> .dt_compat = ls1021a_dt_compat,
> MACHINE_END
> --
> 1.8.0
>
>
> _______________________________________________
> linux-arm-kernel mailing list
> [email protected]
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
>

2014-12-05 10:58:16

by Preeti U Murthy

Subject: Re: [PATCH] arm: ls1021a: setup hrtimer based tick broadcast

On 12/05/2014 03:57 PM, Mark Rutland wrote:
> Hi,
>
> On Fri, Dec 05, 2014 at 09:07:29AM +0000, Jingchang Lu wrote:
>> This adds setup of hrtimer based tick broadcast to utilize
>> the hrtimer in SMP without other broadcast tick devices.
>>
>> Signed-off-by: Jingchang Lu <[email protected]>
>
> This shouldn't live in board code.
>
> Similarly to what happens with the generic dummy timer on all arches
> that select it (and the broadcast hrtimer on all arches that use it so
> far), we should just unconditionally register the broadcast hrtimer.
>
> A real broadcast-capable clock event device will take preference if
> present, so we don't need to add board-specific code to only register
> this in certain conditions.

Hmm.. this makes sense to me. Let me send out a patch to do this.

Regards
Preeti U Murthy
>
> Mark.
>
>> ---
>> arch/arm/mach-imx/mach-ls1021a.c | 12 ++++++++++++
>> 1 file changed, 12 insertions(+)
>>
>> diff --git a/arch/arm/mach-imx/mach-ls1021a.c b/arch/arm/mach-imx/mach-ls1021a.c
>> index b89c858..4d074cf 100644
>> --- a/arch/arm/mach-imx/mach-ls1021a.c
>> +++ b/arch/arm/mach-imx/mach-ls1021a.c
>> @@ -7,6 +7,10 @@
>> * (at your option) any later version.
>> */
>>
>> +#include <linux/clockchips.h>
>> +#include <linux/clk-provider.h>
>> +#include <linux/clocksource.h>
>> +
>> #include <asm/mach/arch.h>
>>
>> #include "common.h"
>> @@ -16,7 +20,15 @@ static const char * const ls1021a_dt_compat[] __initconst = {
>> NULL,
>> };
>>
>> +static void __init ls1021a_init_time(void)
>> +{
>> + of_clk_init(NULL);
>> + clocksource_of_init();
>> + tick_setup_hrtimer_broadcast();
>> +}
>> +
>> DT_MACHINE_START(LS1021A, "Freescale LS1021A")
>> .smp = smp_ops(ls1021a_smp_ops),
>> + .init_time = ls1021a_init_time,
>> .dt_compat = ls1021a_dt_compat,
>> MACHINE_END
>> --
>> 1.8.0
>>
>>
>> _______________________________________________
>> linux-arm-kernel mailing list
>> [email protected]
>> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
>>
>