Hi, All:
The 1.4 Ghz and 1.5 Ghz frequency is not stable for some chips
of rk3328, so we recommend use 1.3 Ghz as the max frequency for rk3328
SoCs.
And the max voltage of vdd_cpu is 1.35V, do not exceed that.
在 2019/3/2 上午3:33, Jonas Karlman 写道:
On 2019-03-01 19:24, Heiko Stuebner wrote:
Hi,
Am Freitag, 1. März 2019, 18:54:53 CET schrieb Leonidas P. Papadakos:
This allows for greater max frequency on rk3328 boards,
increasing performance.
It has been included in Armbian (a linux distibution for ARM boards)
for a while now without any reported issues
https://github.com/armbian/build/blob/master/patch/kernel/rockchip64-default/enable-1392mhz-opp.patch
https://github.com/armbian/build/blob/master/patch/kernel/rockchip64-default/enable-1512mhz-opp.patch
Cc: Heiko Stuebner <heiko@xxxxxxxxx>
Cc: linux-rockchip@xxxxxxxxxxxxxxxxxxx
Signed-off-by: Leonidas P. Papadakos <papadakospan@xxxxxxxxx>
---
arch/arm64/boot/dts/rockchip/rk3328.dtsi | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/arch/arm64/boot/dts/rockchip/rk3328.dtsi b/arch/arm64/boot/dts/rockchip/rk3328.dtsi
index 84f14b132..18caef3c3 100644
--- a/arch/arm64/boot/dts/rockchip/rk3328.dtsi
+++ b/arch/arm64/boot/dts/rockchip/rk3328.dtsi
@@ -123,6 +123,20 @@
opp-microvolt = <1300000>;
clock-latency-ns = <40000>;
};
+ opp-1392000000 {
+ opp-hz = /bits/ 64 <1392000000>;
+ opp-microvolt = <1350000 1350000 1350000>;
+ opp-microvolt-L0 = <1350000 1350000 1350000>;
+ opp-microvolt-L1 = <1325000 1325000 1325000>;
I checked Rockchip's productpage and the chip really seems to be
rated up to 1.5GHz, but you should get rid of opp-microvolt-Lx
options as these are still vendor-specific regarding the leakage
handling.
The datasheet at [1] lists Max CPU frequency of A53 as 1.4 Ghz in Table 3-2 Recommended operating condition,
is there a newer datasheet that lists 1.5 Ghz as recommended max?
[1] http://opensource.rock-chips.com/images/d/d7/Rockchip_RK3328_Datasheet_V1.1-20170309.pdf
Regards,
Jonas
While on it, when all microvolt elements are the same, using the
absolute value instead of "preferred min max" saves a bit of space
similar to the other OPPs in the file.
Thanks
Heiko
+ clock-latency-ns = <40000>;
+ };
+ opp-1512000000 {
+ opp-hz = /bits/ 64 <1512000000>;
+ opp-microvolt = <1450000 1450000 1450000>;
+ opp-microvolt-L0 = <1450000 1450000 1450000>;
+ opp-microvolt-L1 = <1425000 1425000 1425000>;
+ clock-latency-ns = <40000>;
+ };
};
amba {
_______________________________________________
Linux-rockchip mailing list
Linux-rockchip@xxxxxxxxxxxxxxxxxxx
http://lists.infradead.org/mailman/listinfo/linux-rockchip
_______________________________________________
Linux-rockchip mailing list
Linux-rockchip@xxxxxxxxxxxxxxxxxxx
http://lists.infradead.org/mailman/listinfo/linux-rockchip
