* [PATCH] ARM: nomadik: set latencies to 8 cycles
@ 2016-01-04 1:18 Linus Walleij
2016-01-07 5:30 ` Olof Johansson
0 siblings, 1 reply; 2+ messages in thread
From: Linus Walleij @ 2016-01-04 1:18 UTC (permalink / raw)
To: linux-arm-kernel
The Nomadik has sporadic crashes because of these latencies, setting
them to max makes the platform work nicely, so use this values for
now.
These latencies were set to 2 since the Nomadik platform was merged,
but I suspect they never took effect until the right size and
associativity for the cache was specified in the device tree and
that is why the crash comes now.
Cc: stable at vger.kernel.org
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
ARM SoC folks: please apply this directly for fixes at your
convenience.
---
arch/arm/boot/dts/ste-nomadik-stn8815.dtsi | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/arch/arm/boot/dts/ste-nomadik-stn8815.dtsi b/arch/arm/boot/dts/ste-nomadik-stn8815.dtsi
index 314f59c12162..d0c743853318 100644
--- a/arch/arm/boot/dts/ste-nomadik-stn8815.dtsi
+++ b/arch/arm/boot/dts/ste-nomadik-stn8815.dtsi
@@ -25,9 +25,9 @@
cache-sets = <512>;
cache-line-size = <32>;
/* At full speed latency must be >=2 */
- arm,tag-latency = <2>;
- arm,data-latency = <2 2>;
- arm,dirty-latency = <2>;
+ arm,tag-latency = <8>;
+ arm,data-latency = <8 8>;
+ arm,dirty-latency = <8>;
};
mtu0: mtu at 101e2000 {
--
2.4.3
^ permalink raw reply related [flat|nested] 2+ messages in thread
* [PATCH] ARM: nomadik: set latencies to 8 cycles
2016-01-04 1:18 [PATCH] ARM: nomadik: set latencies to 8 cycles Linus Walleij
@ 2016-01-07 5:30 ` Olof Johansson
0 siblings, 0 replies; 2+ messages in thread
From: Olof Johansson @ 2016-01-07 5:30 UTC (permalink / raw)
To: linux-arm-kernel
On Mon, Jan 04, 2016 at 02:18:28AM +0100, Linus Walleij wrote:
> The Nomadik has sporadic crashes because of these latencies, setting
> them to max makes the platform work nicely, so use this values for
> now.
>
> These latencies were set to 2 since the Nomadik platform was merged,
> but I suspect they never took effect until the right size and
> associativity for the cache was specified in the device tree and
> that is why the crash comes now.
>
> Cc: stable at vger.kernel.org
> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
> ---
> ARM SoC folks: please apply this directly for fixes at your
> convenience.
Applied to fixes. THanks.
-Olof
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