linux-kernel - Re: [PATCH v7 07/13] slimbus: Add support for 'clock-pause' feature

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Date:   Fri, 24 Nov 2017 14:39:41 +0000
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     Charles Keepax <ckeepax@...nsource.cirrus.com>
Cc:     gregkh@...uxfoundation.org, broonie@...nel.org,
        alsa-devel@...a-project.org, sdharia@...eaurora.org, bp@...e.de,
        poeschel@...onage.de, treding@...dia.com, andreas.noever@...il.com,
        alan@...ux.intel.com, mathieu.poirier@...aro.org, daniel@...ll.ch,
        jkosina@...e.cz, sharon.dvir1@...l.huji.ac.il, joe@...ches.com,
        davem@...emloft.net, james.hogan@...tec.com,
        michael.opdenacker@...e-electrons.com, robh+dt@...nel.org,
        pawel.moll@....com, mark.rutland@....com,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, vinod.koul@...el.com, arnd@...db.de
Subject: Re: [PATCH v7 07/13] slimbus: Add support for 'clock-pause' feature

Thanks for the Review,

On 23/11/17 07:28, Charles Keepax wrote:
> On Wed, Nov 15, 2017 at 02:10:37PM +0000, srinivas.kandagatla@...aro.org wrote:
>> From: Sagar Dharia <sdharia@...eaurora.org>
>>
>> Per slimbus specification, a reconfiguration sequence known as
>> 'clock pause' needs to be broadcast over the bus while entering low-
>> power mode. Clock-pause is initiated by the controller driver.
>> To exit clock-pause, controller typically wakes up the framer device.
>> Since wakeup precedure is controller-specific, framework calls it via
>> controller's function pointer to invoke it.
>>
>> Signed-off-by: Sagar Dharia <sdharia@...eaurora.org>
>> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
>> ---
>> +/**
>> + * struct slim_sched: Framework uses this structure internally for scheduling.
> 
> Missing kernel doc for clkgear here.
Will add that in next version.

> 
>> + * @clk_state: Controller's clock state from enum slim_clk_state
>> + * @pause_comp: Signals completion of clock pause sequence. This is useful when
>> + *	client tries to call slimbus transaction when controller is entering
>> + *	clock pause.
>> + * @m_reconf: This mutex is held until current reconfiguration (data channel
>> + *	scheduling, message bandwidth reservation) is done. Message APIs can
>> + *	use the bus concurrently when this mutex is held since elemental access
>> + *	messages can be sent on the bus when reconfiguration is in progress.
>> + */
>> +struct slim_sched {
>> +	int			clkgear;
>> +	enum slim_clk_state	clk_state;
>> +	struct completion	pause_comp;
>> +	struct mutex		m_reconf;
>> +};
> 
> Thanks,
> Charles
>