[PATCH] mmc: omap_hsmmc: Add support for Erratum 2.1.1.128 in device tree boot

[Felipe Balbi]

Hi,

On Tue, Jan 21, 2014 at 11:38:00AM -0600, Nishanth Menon wrote:
> On 01/20/2014 05:39 PM, Felipe Balbi wrote:
> > On Mon, Jan 20, 2014 at 05:29:02PM -0600, Nishanth Menon wrote:
> >> When device is booted using devicetree, platforms impacted by
> >> Erratum 2.1.1.128 is not detected easily in the mmc driver. This erratum
> >> indicates that the module cannot do multi-block transfers.
> >>
> >> Handle this by providing a boolean flag to indicate to driver that it is
> >> working on a hardware with mentioned limitation.
> > 
> > sure there's no way of reading the revision register to figure this one
> > out without having to add a new DT attribute ?
> > 
> I did a quick patch to read the Module revision register:
> http://slexy.org/view/s21TKvlWlR
> 
> sdp2430: Revision: 1.2, Spec: 0.0, normal interrupt
> 
> OMAP3430-ldp: (ES2.1): Revision: 2.6, Spec: 0.0, normal interrupt
> SDP3430:(ES3.0) Revision: 2.6, Spec: 0.0, normal interrupt
> AM3517-evm: (ES1.1): Revision: 2.6, Spec: 0.0, normal interrupt
> AM3517-crane:(ES1.1): Revision: 2.6, Spec: 0.0, normal interrupt
> 
> AM37x-evm: (ES1.2) Revision: 2.6, Spec: 0.0, normal interrupt
> OMAP3630-beag-xm (ES1.2): Revision: 2.6, Spec: 0.0, normal interrupt
> 
> am335x-evm:(ES1.0): Revision: 3.1, Spec: 0.1, normal interrupt
> am335x-sk: (ES2.1): Revision: 3.1, Spec: 0.1, normal interrupt
> am335x-beaglebone-black:(ES2.0): Revision: 3.1, Spec: 0.1, normal
> interrupt
> 
> sdp4430.txt: (ES2.2): Revision: 3.1, Spec: 0.1, normal interrupt
> 
> OMAP4460-panda-es (ES1.1): Revision: 3.1, Spec: 0.1, normal interrupt
> 
> OMAP5uevm:(ES2.0): Revision: 3.3, Spec: 0.2, normal interrupt
> dra7-evm (es1.1): Revision: 3.3, Spec: 0.2, normal interrupt
> 
> 
> OMAP3430-ldp seems to be the only one impacted with module revision
> 2.6 -> so using revision information is not really helpful here. Hence
> the usage of a flag in dt attribute to indicate hardware impacted by
> erratum.

alright, that's too bad. Seems like revision in this module isn't very
useful :-(

-- 
balbi
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