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

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Date:	Tue, 24 Nov 2015 10:23:41 +0100
From:	Ludovic Desroches <ludovic.desroches@...el.com>
To:	Ulf Hansson <ulf.hansson@...aro.org>,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
	linux-mmc <linux-mmc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH 1/2] mmc: sdhci: set bus voltage before enabling bus power

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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