linux-kernel - Re: [PATCH v5 3/5] mmc: core: implement enhanced strobe support

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Message-ID: <CAD=FV=WYB4Pg7HcXHVVN-rWAfrV8bGY+MhNFJ+DRJRbhcbXNpQ@mail.gmail.com>
Date:	Mon, 23 May 2016 17:39:32 -0700
From:	Doug Anderson <dianders@...omium.org>
To:	Shawn Lin <shawn.lin@...k-chips.com>
Cc:	Ulf Hansson <ulf.hansson@...aro.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Jaehoon Chung <jh80.chung@...sung.com>,
	Michal Simek <michal.simek@...inx.com>,
	soren.brinkmann@...inx.com, Rob Herring <robh+dt@...nel.org>,
	"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Brian Norris <briannorris@...omium.org>,
	Heiko Stuebner <heiko@...ech.de>,
	"open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH v5 3/5] mmc: core: implement enhanced strobe support

Shawn,

On Sun, May 22, 2016 at 9:13 PM, Shawn Lin <shawn.lin@...k-chips.com> wrote:
> Controllers use data strobe line to latch data from devices
> under hs400 mode, but not for cmd line. So since emmc 5.1, JEDEC
> introduces enhanced strobe mode for latching cmd response from
> emmc devices to host controllers. This new feature is optional,
> so it depends both on device's cap and host's cap to decide
> whether to use it or not.
>
> Signed-off-by: Shawn Lin <shawn.lin@...k-chips.com>
> ---
>
> Changes in v5: None
> Changes in v4: None

Not terribly important, but things certainly did change in this patch
since previous versions.

> Changes in v3: None
> Changes in v2: None
>
>  drivers/mmc/core/bus.c   |  3 +-
>  drivers/mmc/core/core.c  |  9 ++++++
>  drivers/mmc/core/mmc.c   | 84 ++++++++++++++++++++++++++++++++++++++++++++++--
>  include/linux/mmc/card.h |  1 +
>  include/linux/mmc/host.h | 11 +++++++
>  include/linux/mmc/mmc.h  |  3 ++
>  6 files changed, 108 insertions(+), 3 deletions(-)

I don't see anything obviously bad about this patch, but I haven't
gone deep into all the details of mmc_select_hs400es(), so I'm not
sure I can really provide a full Reviewed tag.  At least I have tested
this, so:

Tested-by: Douglas Anderson <dianders@...omium.org>