Re: [PATCH 1/2] mmc: sdhci: set bus voltage before enabling bus power

From	Ludovic Desroches <ludovic.desroches@atmel.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH 1/2] mmc: sdhci: set bus voltage before enabling bus power
Date	2015-11-24 10:30 +0100
Message-ID	<qyi5c-6fp-11@gated-at.bofh.it> (permalink)
References	(2 earlier) <qsUGf-6X1-23@gated-at.bofh.it> <qsVsD-7v9-35@gated-at.bofh.it> <qsVVE-7IC-15@gated-at.bofh.it> <qsXb4-dY-5@gated-at.bofh.it> <qsXE6-pE-17@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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Hi Ulf,

On Mon, Nov 09, 2015 at 05:30:26PM +0100, Ludovic Desroches wrote:
> On Mon, Nov 09, 2015 at 05:00:46PM +0100, Ulf Hansson wrote:

[...]

> > Now, this discussion was interesting, but I forgot what problem you
> > actually where trying to solve? :-)
> 
> There is this discussion because of two things:
> - Fixing something I consider as a bug: when I have a VMMC, only
>   setting/clearing bit 0. Our controller strictly obeys to the spec and
>   check the 'SD Bus Voltage Select' field. Since we put a reserved value
>   (000), the Power On is not performed.
> - I was trying to get help to understand what is this 'SD Bus Voltage'.
>   For our controller and sdhci_set_power(), it seems to stand for VMMC.
>   For me, everything concerning bus voltage is related to VQMMC, so I was
>   disappointed.

Do you plan to take the patch for VMMC? If yes, I will send a new patch
for the device tree (I'll only add vmmc, not vqmmc as discussed); if
not, forget these two patches.

Regards

Ludovic
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Re: [PATCH 1/2] mmc: sdhci: set bus voltage before enabling bus power Ludovic Desroches <ludovic.desroches@atmel.com> - 2015-11-24 10:30 +0100
  Re: [PATCH 1/2] mmc: sdhci: set bus voltage before enabling bus power Ulf Hansson <ulf.hansson@linaro.org> - 2015-11-24 12:10 +0100
    Re: [PATCH 1/2] mmc: sdhci: set bus voltage before enabling bus power Ludovic Desroches <ludovic.desroches@atmel.com> - 2015-11-24 14:20 +0100
      Re: [PATCH 1/2] mmc: sdhci: set bus voltage before enabling bus power Ulf Hansson <ulf.hansson@linaro.org> - 2015-11-24 15:00 +0100
        Re: [PATCH 1/2] mmc: sdhci: set bus voltage before enabling bus power Ludovic Desroches <ludovic.desroches@atmel.com> - 2015-11-24 15:10 +0100
          Re: [PATCH 1/2] mmc: sdhci: set bus voltage before enabling bus power Ulf Hansson <ulf.hansson@linaro.org> - 2015-11-24 16:20 +0100

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