* [PATCH] ARM: DRA7: realtime_counter: Add ratio registers for 20MHZ sys-clk frequency
@ 2013-09-18 11:20 Sricharan R
2013-09-18 12:56 ` [PATCH] ARM: DRA7: realtime_counter: Add ratio registers for 20MHZ sys-clk frequency\ Nishanth Menon
2013-09-18 13:24 ` [PATCH] ARM: DRA7: realtime_counter: Add ratio registers for 20MHZ sys-clk frequency Santosh Shilimkar
0 siblings, 2 replies; 4+ messages in thread
From: Sricharan R @ 2013-09-18 11:20 UTC (permalink / raw)
To: linux-arm-kernel, linux-omap; +Cc: r.sricharan, santosh.shilimkar, rnayak, tony
The real time counter also called master counter, is a free-running
counter. It produces the count used by the CPU local timer peripherals
in the MPU cluster. The timer counts at a rate of 6.144 MHz.
The ratio registers are missing for a sys-clk of 20MHZ which is used
by DRA7 socs. So because of this, the counter was getting wrongly
programmed for a sys-clk of 38.4Mhz(default). So adding the ratio
registers for 20MHZ sys-clk.
Cc: Santosh Shilimkar <santosh.shilimkar@ti.com>
Signed-off-by: Sricharan R <r.sricharan@ti.com>
---
arch/arm/mach-omap2/timer.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/arch/arm/mach-omap2/timer.c b/arch/arm/mach-omap2/timer.c
index e1528a0..fd9238d 100644
--- a/arch/arm/mach-omap2/timer.c
+++ b/arch/arm/mach-omap2/timer.c
@@ -515,6 +515,10 @@ static void __init realtime_counter_init(void)
num = 8;
den = 25;
break;
+ case 20000000:
+ num = 192;
+ den = 625;
+ break;
case 2600000:
num = 384;
den = 1625;
--
1.7.9.5
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH] ARM: DRA7: realtime_counter: Add ratio registers for 20MHZ sys-clk frequency\
2013-09-18 11:20 [PATCH] ARM: DRA7: realtime_counter: Add ratio registers for 20MHZ sys-clk frequency Sricharan R
@ 2013-09-18 12:56 ` Nishanth Menon
2013-09-18 13:24 ` [PATCH] ARM: DRA7: realtime_counter: Add ratio registers for 20MHZ sys-clk frequency Santosh Shilimkar
1 sibling, 0 replies; 4+ messages in thread
From: Nishanth Menon @ 2013-09-18 12:56 UTC (permalink / raw)
To: Sricharan R; +Cc: linux-arm-kernel, linux-omap, santosh.shilimkar, rnayak, tony
On 16:50-20130918, Sricharan R wrote:
> The real time counter also called master counter, is a free-running
> counter. It produces the count used by the CPU local timer peripherals
> in the MPU cluster. The timer counts at a rate of 6.144 MHz.
>
> The ratio registers are missing for a sys-clk of 20MHZ which is used
> by DRA7 socs. So because of this, the counter was getting wrongly
> programmed for a sys-clk of 38.4Mhz(default). So adding the ratio
> registers for 20MHZ sys-clk.
>
> Cc: Santosh Shilimkar <santosh.shilimkar@ti.com>
> Signed-off-by: Sricharan R <r.sricharan@ti.com>
Tested-by: Nishanth Menon <nm@ti.com>
platform: DRA7-evm
> ---
> arch/arm/mach-omap2/timer.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/arch/arm/mach-omap2/timer.c b/arch/arm/mach-omap2/timer.c
> index e1528a0..fd9238d 100644
> --- a/arch/arm/mach-omap2/timer.c
> +++ b/arch/arm/mach-omap2/timer.c
> @@ -515,6 +515,10 @@ static void __init realtime_counter_init(void)
> num = 8;
> den = 25;
> break;
> + case 20000000:
> + num = 192;
> + den = 625;
> + break;
> case 2600000:
> num = 384;
> den = 1625;
> --
> 1.7.9.5
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-omap" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
--
Regards,
Nishanth Menon
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] ARM: DRA7: realtime_counter: Add ratio registers for 20MHZ sys-clk frequency
2013-09-18 11:20 [PATCH] ARM: DRA7: realtime_counter: Add ratio registers for 20MHZ sys-clk frequency Sricharan R
2013-09-18 12:56 ` [PATCH] ARM: DRA7: realtime_counter: Add ratio registers for 20MHZ sys-clk frequency\ Nishanth Menon
@ 2013-09-18 13:24 ` Santosh Shilimkar
2013-10-08 21:27 ` Tony Lindgren
1 sibling, 1 reply; 4+ messages in thread
From: Santosh Shilimkar @ 2013-09-18 13:24 UTC (permalink / raw)
To: Sricharan R; +Cc: linux-arm-kernel, linux-omap, rnayak, tony
On Wednesday 18 September 2013 07:20 AM, Sricharan R wrote:
> The real time counter also called master counter, is a free-running
> counter. It produces the count used by the CPU local timer peripherals
> in the MPU cluster. The timer counts at a rate of 6.144 MHz.
>
> The ratio registers are missing for a sys-clk of 20MHZ which is used
> by DRA7 socs. So because of this, the counter was getting wrongly
> programmed for a sys-clk of 38.4Mhz(default). So adding the ratio
> registers for 20MHZ sys-clk.
>
> Cc: Santosh Shilimkar <santosh.shilimkar@ti.com>
> Signed-off-by: Sricharan R <r.sricharan@ti.com>
> ---
Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] ARM: DRA7: realtime_counter: Add ratio registers for 20MHZ sys-clk frequency
2013-09-18 13:24 ` [PATCH] ARM: DRA7: realtime_counter: Add ratio registers for 20MHZ sys-clk frequency Santosh Shilimkar
@ 2013-10-08 21:27 ` Tony Lindgren
0 siblings, 0 replies; 4+ messages in thread
From: Tony Lindgren @ 2013-10-08 21:27 UTC (permalink / raw)
To: Santosh Shilimkar; +Cc: Sricharan R, linux-arm-kernel, linux-omap, rnayak
* Santosh Shilimkar <santosh.shilimkar@ti.com> [130918 06:32]:
> On Wednesday 18 September 2013 07:20 AM, Sricharan R wrote:
> > The real time counter also called master counter, is a free-running
> > counter. It produces the count used by the CPU local timer peripherals
> > in the MPU cluster. The timer counts at a rate of 6.144 MHz.
> >
> > The ratio registers are missing for a sys-clk of 20MHZ which is used
> > by DRA7 socs. So because of this, the counter was getting wrongly
> > programmed for a sys-clk of 38.4Mhz(default). So adding the ratio
> > registers for 20MHZ sys-clk.
> >
> > Cc: Santosh Shilimkar <santosh.shilimkar@ti.com>
> > Signed-off-by: Sricharan R <r.sricharan@ti.com>
> > ---
> Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Applying into omap-for-v3.13/soc thanks.
Tony
^ permalink raw reply [flat|nested] 4+ messages in thread
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2013-09-18 11:20 [PATCH] ARM: DRA7: realtime_counter: Add ratio registers for 20MHZ sys-clk frequency Sricharan R
2013-09-18 12:56 ` [PATCH] ARM: DRA7: realtime_counter: Add ratio registers for 20MHZ sys-clk frequency\ Nishanth Menon
2013-09-18 13:24 ` [PATCH] ARM: DRA7: realtime_counter: Add ratio registers for 20MHZ sys-clk frequency Santosh Shilimkar
2013-10-08 21:27 ` Tony Lindgren
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