Re: [PATCH] sdio: add MMC_CAP_VDD_165_195 host capability

Ohad Ben-Cohen
2009-10-14T07:57:25Z

On Tue, Oct 13, 2009 at 4:39 AM, Philip Langdale <philipl@overt.org> wrote:
> Interesting. But that means that Ohad's patch doesn't make much sense;
> his uses the MMC low voltage OCR bit in an SDIO context. So either, the
> patch is wrong, or he's dealing with out-of-spec hardware.

Yes, the hardware is out-of-spec. It uses the undefined low voltage
OCR bit to achieve 1.8V SDIO voltage. By removing the MMC_VDD_165_195
restriction, commit 27cce39f555def6f5ebe7f03d69ccc44ab25f0b2 makes it
possible for the hardware to work with unpatched kernels.

Philip, David, Pierre - would you like to remove the MMC_VDD_165_195
restriction differently ? maybe to revive the MMC_CAP_VDD_165_195 host
capability patch in some way (see
http://www.mail-archive.com/linux-mmc@vger.kernel.org/msg00386.html) ?

Thank you for the comments and help,
Ohad.