From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ulf Hansson <ulf.hansson@linaro.org>
Subject: Re: [PATCH 7/10] mmc: sdhci-xenon: Add support to PHYs of Marvell
 Xenon SDHC
Date: Mon, 28 Nov 2016 12:09:33 +0100
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To: Ziji Hu <huziji@marvell.com>
Cc: Gregory CLEMENT <gregory.clement@free-electrons.com>, Adrian Hunter <adrian.hunter@intel.com>, "linux-mmc@vger.kernel.org" <linux-mmc@vger.kernel.org>, Jason Cooper <jason@lakedaemon.net>, Andrew Lunn <andrew@lunn.ch>, Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>, Rob Herring <robh+dt@kernel.org>, "devicetree@vger.kernel.org" <devicetree@vger.kernel.org>, Thomas Petazzoni <thomas.petazzoni@free-electrons.com>, "linux-arm-kernel@lists.infradead.org" <linux-arm-kernel@lists.infradead.org>, Jimmy Xu <zmxu@marvell.com>, Jisheng Zhang <jszhang@marvell.com>, Nadav Haklai <nadavh@marvell.com>, Ryan Gao <ygao@marvell.com>, Doug Jones <dougj@marvell.com>, Victor Gu <xigu@marvell.com>, "Wei(SOCP) Liu" <liuw@marvell.com>, Wilson Ding <dingwei@marvell.com>
List-Id: devicetree@vger.kernel.org

[...]

>
>     Could you please tell me the requirement of "op_code" parameter in
>     mmc_send_tuning()?
>     According to mmc_send_tuning(),it seems that tuning command(CMD19/CMD21)
>     is required. Thus device will not response mmc_send_tuning() if current
>     speed mode doesn't support tuning command.
>     Please correct me if I am wrong.
>

When the mmc core decides it's time to execute tuning, it invokes the
->execute_tuning() host ops, which has the "opcode" as a parameter.
You should be able to use it when calling mmc_send_tuning().

[...]

Kind regards
Uffe