linux-kernel - Re: [PATCH v3 2/7] mmc: bcm2835: Add new driver for the sdhost controller.

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Date:   Wed, 1 Mar 2017 20:21:52 +0100 (CET)
From:   Stefan Wahren <stefan.wahren@...e.com>
To:     Gerd Hoffmann <kraxel@...hat.com>, Eric Anholt <eric@...olt.net>,
        linux-rpi-kernel@...ts.infradead.org
Cc:     will.deacon@....com, linux@...linux.org.uk, lee@...nel.org,
        rjui@...adcom.com, robh+dt@...nel.org,
        linux-arm-kernel@...ts.infradead.org, ulf.hansson@...aro.org,
        sbranden@...adcom.com, linux-kernel@...r.kernel.org,
        catalin.marinas@....com, linux-mmc@...r.kernel.org,
        bcm-kernel-feedback-list@...adcom.com, swarren@...dotorg.org,
        mark.rutland@....com, f.fainelli@...il.com,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v3 2/7] mmc: bcm2835: Add new driver for the sdhost
 controller.


> Eric Anholt <eric@...olt.net> hat am 1. März 2017 um 19:00 geschrieben:
> 
> 
> Gerd Hoffmann <kraxel@...hat.com> writes:
> 
> > From: Eric Anholt <eric@...olt.net>
> >
> > The 2835 has two SD controllers: The Arasan sdhci controller (supported
> > by the iproc driver) and a custom sdhost controller.  This patch adds a
> > driver for the latter.
> >
> > The sdhci controller supports both sdcard and sdio.  The sdhost
> > controller supports the sdcard only, but has better performance.  Also
> > note that the rpi3 has sdio wifi, so driving the sdcard with the sdhost
> > controller allows to use the sdhci controller for wifi support.
> >
> > The configuration is done by devicetree via pin muxing.  Both SD
> > controller are available on the same pins (2 pin groups = pin 22 to 27 +
> > pin 48 to 53).  So it's possible to use both SD controllers at the same
> > time with different pin groups.
> >
> > The code was originally written by Phil Elwell in the downstream
> > Rasbperry Pi tree, and I did a major cleanup on it (+319, -707 lines
> > out of the original 2055) for inclusion.
> >
> > Signed-off-by: Eric Anholt <eric@...olt.net>
> 
> Ulf, what do you need done to this driver patch before it can go in?
> The commit message seems like it could use some rewriting at this point
> (Personally I would drop the detailed changelogs from Stefan and Gerd,
> updating the last paragraph here to give them credit), but what's
> important to me is getting the driver in so that distros don't have to
> carry this patch for wifi support.

I'm still working on 3 small patches for this driver:

1. trivial error in a register comment
2. ignore SDCMD_FAIL_FLAG during bcm2835_finish_command (downstream [1])
3. remove unnecessary call to bcm2835_reset_internal

I plan to submit them on Friday.

[1] - https://github.com/raspberrypi/linux/commit/711cade866c9f865f9b283c9369e9486f27d1fec