On 2 April 2016 at 02:42, Heiko Stuebner <heiko@sntech.de> wrote:

> Am Mittwoch, 30. März 2016, 20:40:31 schrieb Jaehoon Chung:
> > modified Rob's mail address.
> >
> > On 03/30/2016 04:24 PM, Guodong Xu wrote:
> > > mmc registers may in abnormal state if mmc is used in bootloader,
> > > eg. to support booting from eMMC. So we need reset mmc registers
> > > when kernel boots up, instead of assuming mmc is in clean state.
> >
> > Do you mean mmc(card side) register or dwmmc host controller's register
> on
> > host side?
> >
> > According to dwmmc controller TMR, there are two reset signals. One is
> > reset_n, other is rst_n. It seems this patch is relevant to reset_n(For
> > host). (rst_n is hardware reset for card.)
> >
> > So could you clarify better? Then it's helpful to me for understanding..
>
> I think that actually means a reset of controller IP block logic, outside
> the control of the dw_mmc block itself.
>

Right, I mean dw_mmc host controller itself. Thanks.

-Guodong


>
> On Rockchip SoCs this gets triggered from the CRU (clock and reset unit),
> so
> I guess if I'm reading the manual correctly, should be the reset_n signal
> of
> the ip block.
>
> rst_n on the other hand gets triggered through a dw_mmc register setting
> and
> is already handled by the dw_mmc driver.
>
>
> Heiko
>