On Fri, Jan 07, 2022 at 03:53:14PM -0800, Brian Norris wrote: > 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@xxxxxxxxxxxx> > --- > > .../bindings/devfreq/rk3399_dmc.yaml | 42 +++++++++++++++++++ > 1 file changed, 42 insertions(+) > > diff --git a/Documentation/devicetree/bindings/devfreq/rk3399_dmc.yaml b/Documentation/devicetree/bindings/devfreq/rk3399_dmc.yaml > index 2c871c57fd97..357d07c5a3df 100644 > --- a/Documentation/devicetree/bindings/devfreq/rk3399_dmc.yaml > +++ b/Documentation/devicetree/bindings/devfreq/rk3399_dmc.yaml > @@ -271,6 +271,43 @@ properties: > When the DRAM type is LPDDR4, this parameter defines the PHY side ODT > strength. Default value is 60. > > + rockchip,pd_idle_dis_freq: s/_/-/ on all the new properties. > + $ref: /schemas/types.yaml#/definitions/uint32 > + 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. > + > + rockchip,sr_idle_dis_freq: '-hz' suffix. Let's not repeat the same problem. > + $ref: /schemas/types.yaml#/definitions/uint32 And then the type can be dropped. > + 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. > + > + rockchip,sr_mc_gate_idle_dis_freq: > + $ref: /schemas/types.yaml#/definitions/uint32 > + 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. > + > + rockchip,srpd_lite_idle_dis_freq: > + $ref: /schemas/types.yaml#/definitions/uint32 > + 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. > + > + rockchip,standby_idle_dis_freq: > + $ref: /schemas/types.yaml#/definitions/uint32 > + 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. > + > additionalProperties: false > > examples: > @@ -294,4 +331,9 @@ examples: > rockchip,ddr3_odt_dis_freq = <333000000>; > rockchip,lpddr3_odt_dis_freq = <333000000>; > rockchip,lpddr4_odt_dis_freq = <333000000>; > + rockchip,pd_idle_dis_freq = <1000000000>; > + rockchip,sr_idle_dis_freq = <1000000000>; > + rockchip,sr_mc_gate_idle_dis_freq = <1000000000>; > + rockchip,srpd_lite_idle_dis_freq = <0>; > + rockchip,standby_idle_dis_freq = <928000000>; > }; > -- > 2.34.1.575.g55b058a8bb-goog > >
