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    • Caesar Wang's avatar
      arm64: dts: rockchip: update dynamic-power-coefficient for rk3399 · 45a995c0
      Caesar Wang authored
      This patch updates the dynamic-power-coefficient for big cluster on
      rk3399 SoCs.
      
      The dynamic power consumption of the CPU is proportional to the square of
      the Voltage (V) and the clock frequency (f). The coefficient is used to
      calculate the dynamic power as below -
      Pdyn = dynamic-power-coefficient * V^2 * f
      Where Voltage is in uV, frequency is in MHz.
      
      As the following is the tested data on rk3399's big cluster.
      frequency(MHz)  Voltage(V)  Current(mA) Dynamic-power-coefficient
      24              0.8         15
      48              0.8         23          ~417
      96              0.8         40          ~443
      216             0.8         82          ~438
      312             0.8         115         ~430
      408             0.8         150         ~455
      So the dynamic-power-coefficient average value is about 436.
      Signed-off-by: default avatarCaesar Wang <wxt@rock-chips.com>
      Signed-off-by: default avatarHeiko Stuebner <heiko@sntech.de>
      45a995c0
  10. 29 Jul, 2017 2 commits
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