On 11/15/11, Kukjin Kim <kgene.kim@xxxxxxxxxxx> wrote: > Chanwoo Choi wrote: >> Hi Kukjin Kim, >> >> Please reply about Sylwester Nawrocki and me. >> 2011/11/3 Sylwester Nawrocki <s.nawrocki@xxxxxxxxxxx> >> Hi Kgene, >> >> On 11/03/2011 03:09 AM, Kukjin Kim wrote: >> > As I said, I don't think we should control/gate the clocks with > regarding power domain. >> As far as I know there is a plan to let the drivers override > start/stop_device callbacks, >> moreover the clock control can be disabled globally by not implementing > start/stop_device >> callbacks or per device by not adding clkdev entities to the device clock > list at runtime >> PM core. So IMHO, there is/going to be enough flexibility. >> >> > It should be controlled by each regarding device driver and in addition, > as I know, >> > to handle block of clock is not recommended on EXYNOS4 now. >> What do you mean by this ? I couldn't find such information in any > documentation. >> Shouldn't "clock gate block" registers be touched by boot loader and the > kernel? >> Our boot loaders disable all clocks, and if the global clock gate is not > enabled >> by the kernel there is no chance any multimedia device will work. >> >> Should the global clock block gate be always enabled then ? I'm afraid it > is not >> optimal form power management POV. >> > Sylwester, let me check again before replying. > >> To Kukjin Kim, >> > Hi Chanwoo, > > Firstly, please use text-typed e-mail when you reply. > >> > It should be controlled by each regarding device driver and in addition, > as I know, >> > to handle block of clock is not recommended on EXYNOS4 now. >> >> As you said, should we separately control power and clock of power domain? > > If you ask my opinion, yes, I mean when it is required, it would be > controlled independent. Okay. It's meaning-less, Until change his mind, just drop it. I hope you don't change this mind for long time. Thank you, Kyungmin Park > >> or Have to turn on the clock of power domain always? > > I didn't say like that. > >> I think that it is to happen unnecessary power consumption. > > I don't think, when the power of block/domain is downed, does it happen > _really_ meaningful power consumption? > >> If we have to maintain on state of power domain clock, please let me know > guide about this. >> >> Also, >> For example, fimg2d and framebuffer use LCD0 power domain as parent > device.I >> If fimg2d and framebuffer is disabled state due to not using their, >> I think that we should turn off the clock of LCD0 power domain to reduce > power leakage. > > I think, probably it doesn't matter. If any useful data, please let me know. > >> Which each regarding device driver control the clock of power domain? >> >> I will expect for your reply. >> > > Thanks. > > Best regards, > Kgene. > -- > Kukjin Kim <kgene.kim@xxxxxxxxxxx>, Senior Engineer, > SW Solution Development Team, Samsung Electronics Co., Ltd. > > -- > To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" > in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/linux-pm
