From: Stephen Boyd <sboyd@codeaurora.org>
To: Saravana Kannan <skannan@codeaurora.org>
Cc: David Brown <davidb@codeaurora.org>,
Daniel Walker <dwalker@fifo99.com>,
Bryan Huntsman <bryanh@codeaurora.org>,
linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH 03/10] msm: iommu: Convert to clk_prepare/unprepare
Date: Tue, 25 Sep 2012 13:16:40 -0700 [thread overview]
Message-ID: <50621128.5040805@codeaurora.org> (raw)
In-Reply-To: <5060DF7D.9000305@codeaurora.org>
On 09/24/12 15:32, Saravana Kannan wrote:
>> @@ -275,8 +275,11 @@ static int msm_iommu_remove(struct
>> platform_device *pdev)
>>
>> drv = platform_get_drvdata(pdev);
>> if (drv) {
>> - if (drv->clk)
>> + if (drv->clk) {
>> + clk_unprepare(drv->clk);
>> clk_put(drv->clk);
>> + }
>> + clk_unprepare(drv->pclk);
>
>
> Are these changes right? Every other clk API change in this patch is
> using the combined prepare_enable/disable_unprepare() calls. So, when
> would we end up at this location with the clocks prepared but not
> enabled?
>
> Also, what if the device gets probed and then immediately removed.
> Will it work correctly?
>
It should work correctly. If you look at the bottom of msm_iommu_probe()
you see that it call clk_disable() and doesn't unprepare the clock. So
if the driver is unbound the clocks should be disabled but still prepared.
--
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
hosted by The Linux Foundation
next prev parent reply other threads:[~2012-09-25 20:16 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-21 2:26 [PATCH 00/10] Convert MSM to common clock framework Stephen Boyd
2012-09-21 2:26 ` [PATCH 01/10] usb: otg: msm: Convert to clk_prepare/unprepare Stephen Boyd
[not found] ` <1348194419-11486-2-git-send-email-sboyd-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2012-09-26 16:58 ` Pankaj Jangra
2012-09-26 18:48 ` Stephen Boyd
[not found] ` <50634DF9.5010608-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2012-09-26 18:52 ` Pankaj Jangra
2012-09-21 2:26 ` [PATCH 02/10] msm_sdcc: " Stephen Boyd
2012-09-21 2:26 ` [PATCH 03/10] msm: iommu: " Stephen Boyd
2012-09-24 22:32 ` Saravana Kannan
2012-09-25 20:16 ` Stephen Boyd [this message]
2012-09-21 2:26 ` [PATCH 04/10] msm: iommu: Use clk_set_rate() instead of clk_set_min_rate() Stephen Boyd
2012-09-21 2:26 ` [PATCH 05/10] ARM: msm: Remove custom clk_set_flags() API Stephen Boyd
2012-09-24 22:33 ` Saravana Kannan
2012-09-21 2:26 ` [PATCH 06/10] ARM: msm: Remove custom clk_set_{max,min}_rate() API Stephen Boyd
2012-09-24 22:37 ` Saravana Kannan
2012-09-21 2:26 ` [PATCH 07/10] ARM: msm: Remove clock-7x30.h include file Stephen Boyd
2012-09-26 17:51 ` Pankaj Jangra
2012-09-26 18:18 ` Stephen Boyd
2012-09-26 18:54 ` Pankaj Jangra
2012-09-21 2:26 ` [PATCH 08/10] ARM: msm: Prepare clk_get() users in mach-msm for clock-pcom driver Stephen Boyd
2012-09-26 17:35 ` Pankaj Jangra
2012-09-26 18:14 ` Stephen Boyd
2012-09-21 2:26 ` [PATCH 09/10] ARM: msm: Make proc_comm clock control into a platform driver Stephen Boyd
2012-09-26 18:03 ` Pankaj Jangra
2012-09-26 18:36 ` Stephen Boyd
2012-09-21 2:26 ` [PATCH 10/10] ARM: msm: Migrate to common clock framework Stephen Boyd
2012-09-26 18:47 ` Pankaj Jangra
2012-09-26 18:50 ` Stephen Boyd
2012-09-26 18:57 ` Pankaj Jangra
2012-09-22 1:10 ` [PATCH 00/10] Convert MSM " Mike Turquette
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