Hi Naoki FUKAUMI, On 09/12/2014 07:37 PM, Naoki FUKAUMI wrote: > Hi Kever Yang, > > On Fri, Sep 12, 2014 at 4:33 PM, Kever Yang <kever.yang at rock-chips.com> wrote: >> Here is the general OPP table for rk3288 we recommend to use in upstream: >> >> operating-points = < >> /* KHz uV */ >> 1608000 1350000 >> 1512000 1300000 >> 1416000 1200000 >> 1200000 1100000 >> 1008000 1050000 >> 816000 1000000 >> 696000 950000 >> 600000 900000 >> 408000 900000 >> 312000 900000 >> 216000 900000 >> 126000 900000 >> >; >> >> After this, >> Reviewed-by: Kever Yang <kever.yang at rock-chips.com> >> >> Note that the CPU can't not stay on top frequency for a long time, the cpu >> might overheat, the cpufreq is better to work with cpu thermal for rk3288. > This commit says 1800000 is safe, but actually it's not safe? > https://bitbucket.org/T-Firefly/firefly-rk3288/commits/7048675eec554a1aa4a3874c7bb24806e1e1c06b/raw/ As you have seen, that patch is for a dts file which is board related instead of rk3288.dtsi, it should be safe for T-firefly board, but I'm not sure it works for all the boards. The operation table I provide for rk3288.dtsi with conservative values and available for all boards based on rk3288, and maybe need an OPP table with optimized values in dts board file for board customized. -Kever
