From: Jaehoon Chung <jh80.chung@samsung.com>
To: Doug Anderson <dianders@chromium.org>
Cc: Jaehoon Chung <jh80.chung@samsung.com>,
Chris Ball <cjb@laptop.org>, Seungwon Jeon <tgih.jun@samsung.com>,
James Hogan <james.hogan@imgtec.com>,
Grant Grundler <grundler@chromium.org>,
Alim Akhtar <alim.akhtar@samsung.com>,
Abhilash Kesavan <a.kesavan@samsung.com>,
Tomasz Figa <tomasz.figa@gmail.com>,
Olof Johansson <olof@lixom.net>,
"linux-mmc@vger.kernel.org" <linux-mmc@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v6 2/3] mmc: dw_mmc: Honor requests to set the clock to 0 (turn off clock)
Date: Mon, 26 Aug 2013 10:31:11 +0900 [thread overview]
Message-ID: <521AAFDF.9090608@samsung.com> (raw)
In-Reply-To: <CAD=FV=WrZacm7UUB3-qE=ufwkur_55m0puPNdUaGBYszPw9OdQ@mail.gmail.com>
Hi Doug,
On 08/24/2013 05:40 AM, Doug Anderson wrote:
> Jaehoon,
>
> On Fri, Aug 23, 2013 at 6:21 AM, Jaehoon Chung <jh80.chung@samsung.com> wrote:
>> Hi Doug,
>>
>> If the clock-gating is enabled, then maybe it's continuously printed the kernel message for Bus_speed.
>
> Can you explain? I don't think dw_mmc has support for clock gating
> right now. ...or are there some patches that I'm not aware of? I
> could believe that if you've got some non-upstream clock gating
> patches that these would need to be modified to handle it... ...but
> unless those are slated to land upstream it seems like I can't take
> them into account, can I?
If i enabled the CONFIG_MMC_CLK_GATE, the i have found the below message whenever some operation is run.
I will test more with your patch.
[ 6.335000] mmc_host mmc1: Bus speed (slot 0) = 100000000Hz (slot req 52000000Hz, actual 50000000HZ div = 1)
[ 6.345000] mmc_host mmc1: Bus speed (slot 0) = 100000000Hz (slot req 52000000Hz, actual 50000000HZ div = 1)
[ 6.355000] mmc_host mmc1: Bus speed (slot 0) = 100000000Hz (slot req 52000000Hz, actual 50000000HZ div = 1)
[ 6.365000] mmc_host mmc1: Bus speed (slot 0) = 100000000Hz (slot req 52000000Hz, actual 50000000HZ div = 1)
[ 6.375000] mmc_host mmc1: Bus speed (slot 0) = 100000000Hz (slot req 52000000Hz, actual 50000000HZ div = 1)
[ 6.480000] mmc_host mmc1: Bus speed (slot 0) = 100000000Hz (slot req 52000000Hz, actual 50000000HZ div = 1)
[ 6.490000] mmc_host mmc1: Bus speed (slot 0) = 100000000Hz (slot req 52000000Hz, actual 50000000HZ div = 1)
[ 6.500000] mmc_host mmc1: Bus speed (slot 0) = 100000000Hz (slot req 52000000Hz, actual 50000000HZ div = 1)
[ 6.530000] mmc_host mmc1: Bus speed (slot 0) = 100000000Hz (slot req 52000000Hz, actual 50000000HZ div = 1)
[ 6.535000] mmc_host mmc1: Bus speed (slot 0) = 100000000Hz (slot req 52000000Hz, actual 50000000HZ div = 1)
[ 6.545000] mmc_host mmc1: Bus speed (slot 0) = 100000000Hz (slot req 52000000Hz, actual 50000000HZ div = 1)
Best Regards,
Jaehoon Chung
>
> Thanks!
>
> -Doug
> --
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next prev parent reply other threads:[~2013-08-26 1:31 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-22 16:19 [PATCH v6 0/3] mmc: dw_mmc: fixes for suspend/resume on exynos Doug Anderson
2013-08-22 16:19 ` Doug Anderson
2013-08-22 16:19 ` [PATCH v6 1/3] mmc: dw_mmc: Add exynos resume_noirq callback to clear WAKEUP_INT Doug Anderson
2013-08-22 16:19 ` Doug Anderson
2013-08-22 16:19 ` [PATCH v6 2/3] mmc: dw_mmc: Honor requests to set the clock to 0 (turn off clock) Doug Anderson
2013-08-23 13:21 ` Jaehoon Chung
2013-08-23 20:40 ` Doug Anderson
2013-08-26 1:31 ` Jaehoon Chung [this message]
2013-08-26 3:38 ` Doug Anderson
2013-08-26 4:34 ` Seungwon Jeon
2013-08-26 9:06 ` Jaehoon Chung
2013-08-26 16:05 ` Doug Anderson
2013-08-29 7:04 ` Seungwon Jeon
2013-08-29 16:34 ` Doug Anderson
2013-08-30 3:55 ` Seungwon Jeon
2013-08-22 16:19 ` [PATCH v6 3/3] mmc: dw_mmc: Set timeout to max upon resume Doug Anderson
2013-08-23 12:56 ` Jaehoon Chung
2013-08-29 16:39 ` [PATCH v7 0/3] mmc: dw_mmc: fixes for suspend/resume on exynos Doug Anderson
2013-08-29 16:39 ` Doug Anderson
2013-08-29 16:39 ` Doug Anderson
2013-08-29 16:39 ` [PATCH v7 1/3] mmc: dw_mmc: Add exynos resume_noirq callback to clear WAKEUP_INT Doug Anderson
2013-08-29 16:39 ` Doug Anderson
2013-08-29 16:39 ` [PATCH v7 2/3] mmc: dw_mmc: Honor requests to set the clock to 0 (turn off clock) Doug Anderson
2013-08-30 11:31 ` Seungwon Jeon
2013-08-29 16:39 ` [PATCH v7 3/3] mmc: dw_mmc: Set timeout to max upon resume Doug Anderson
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