Re: [PATCH v3 5/6] ARM: shmobile: lager: Set clock rates for SDHI

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Tue, 2015-06-30 at 01:02 +0100, Ben Hutchings wrote:
> On Mon, 2015-06-29 at 06:23 +0000, Kuninori Morimoto wrote:
[...]
> > If so, why we can't use max-frequency ?
> > We can calculate/set SDHI IP clocks via 
> > max-frequency / clk_round_rate() / clk_set_rate()
> > since we know SDHI's divider capability.
> > 
> > SH-MMC is using this style. and I think it is flexible for every speed.
> > Please check sh_mmcif_clock_control(), sh_mmcif_clk_setup()
> > on ${LINUX}/drivers/mmc/host/sh_mmcif.c
> 
> That's certainly a nicer way of doing this.  The difficulty I see is
> that tmio_mmc doesn't know anything about the input clock, and not all
> of the drivers using it actually use the clock framework.

More importantly, that algrithm can result in overclocking the card.

Ben.


--
To unsubscribe from this list: send the line "unsubscribe linux-mmc" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html



[Index of Archives]     [Linux USB Devel]     [Linux Media]     [Video for Linux]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]

  Powered by Linux