linux-kernel - Re: [PATCH v4 0/3] about data busy

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Date:	Mon, 16 Feb 2015 12:09:43 +0100
From:	Javier Martinez Canillas <javier@...hile0.org>
To:	Jaehoon Chung <jh80.chung@...sung.com>
Cc:	Addy Ke <addy.ke@...k-chips.com>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Olof Johansson <olof@...om.net>,
	Alim Akhtar <alim.akhtar@...il.com>,
	Andrzej Hajda <a.hajda@...sung.com>,
	Douglas Anderson <dianders@...omium.org>,
	Heiko Stübner <heiko@...ech.de>,
	cf@...k-chips.com, lintao@...k-chips.com, huangtao@...k-chips.com,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	linux-rockchip@...ts.infradead.org
Subject: Re: [PATCH v4 0/3] about data busy

Hello Jaehoon,

On Mon, Feb 16, 2015 at 6:48 AM, Jaehoon Chung <jh80.chung@...sung.com> wrote:
> On 02/15/2015 08:41 PM, Javier Martinez Canillas wrote:
>> I modified [1] your patch #2 to do what Alim suggested and only with
>> that patch on top of linux-next I have neither the the "Timeout
>> sending command" error nor the uSD not getting detected errors. Linux
>> mounts the rootfs from the uSD and the wifi SDIO device is enumerated
>> and listed in /sys/bus/sdio/devices/
>
> it needs to check when clock value only update.
> As Javier and Alim are mentioned, if check whether card is busy or not in setup_bus(),
> should be processed unnecessary checking.
> (According to TRM, before disabling clock, check whether card is busy or not.)
> if my thinking is right, chekcing is located more exactly before mci_writel(host, CLKENA, 0).
>
> And i recommend if CLK_GATE is enabled, clkgate_delay sets to the bigger value than 3.
> I'm not sure Javier's issue is same thing..I will check more this.
>

Thanks for checking, do you have access to a Peach Pit or Pi
Chromebook to reproduce the issue I reported? Please let me know if
you need any help from me.

> Best Regards,
> Jaehoon Chung
>

Best regards,
Javier
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