UbiquitousOS
/
OpenCloudOS-Kernel
mirror of https://gitee.com/OpenCloudOS/OpenCloudOS-Kernel.git
11
0
Fork 0
Code Issues Projects Releases Wiki Activity

dt-bindings: devfreq: rk3399_dmc: Add more disable-freq properties 

DDR DVFS tuning has found that several power-saving features don't have
good tradeoffs at higher frequencies -- at higher frequencies, we'll see
glitches or other errors. Provide tuning controls so these can be
disabled at higher OPPs, and left active only at the lower ones.

Signed-off-by: Brian Norris <briannorris@chromium.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
This commit is contained in:
Brian Norris 2022-03-08 11:08:51 -08:00 committed by Chanwoo Choi
parent 77c188085b
commit a86fb6a9a2
1 changed files with 37 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

37
Documentation/devicetree/bindings/memory-controllers/rockchip,rk3399-dmc.yaml
View File

@ -313,6 +313,38 @@ properties:
self-refresh mode. The controller, pi, PHY and DRAM clock will be gated
if bus is idle for standby_idle nanoseconds.
rockchip,pd-idle-dis-freq-hz:
description:
Defines the power-down idle disable frequency in Hz. When the DDR
frequency is greater than pd-idle-dis-freq, power-down idle is disabled.
See also rockchip,pd-idle-ns.
rockchip,sr-idle-dis-freq-hz:
description:
Defines the self-refresh idle disable frequency in Hz. When the DDR
frequency is greater than sr-idle-dis-freq, self-refresh idle is
disabled. See also rockchip,sr-idle-ns.
rockchip,sr-mc-gate-idle-dis-freq-hz:
description:
Defines the self-refresh and memory-controller clock gating disable
frequency in Hz. When the DDR frequency is greater than
sr-mc-gate-idle-dis-freq, the clock will not be gated when idle. See also
rockchip,sr-mc-gate-idle-ns.
rockchip,srpd-lite-idle-dis-freq-hz:
description:
Defines the self-refresh power down idle disable frequency in Hz. When
the DDR frequency is greater than srpd-lite-idle-dis-freq, memory will
not be placed into self-refresh power down mode when idle. See also
rockchip,srpd-lite-idle-ns.
rockchip,standby-idle-dis-freq-hz:
description:
Defines the standby idle disable frequency in Hz. When the DDR frequency
is greater than standby-idle-dis-freq, standby idle is disabled. See also
rockchip,standby-idle-ns.
required:
- compatible
- devfreq-events
@ -344,4 +376,9 @@ examples:
rockchip,ddr3_odt_dis_freq = <333000000>;
rockchip,lpddr3_odt_dis_freq = <333000000>;
rockchip,lpddr4_odt_dis_freq = <333000000>;
rockchip,pd-idle-dis-freq-hz = <1000000000>;
rockchip,sr-idle-dis-freq-hz = <1000000000>;
rockchip,sr-mc-gate-idle-dis-freq-hz = <1000000000>;
rockchip,srpd-lite-idle-dis-freq-hz = <0>;
rockchip,standby-idle-dis-freq-hz = <928000000>;
};