linux-kernel - Re: [PATCH] interconnect: Add helpers for enabling/disabling a path

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Date:   Tue, 28 Apr 2020 18:50:00 +0300
From:   Georgi Djakov <georgi.djakov@...aro.org>
To:     Matthias Kaehlcke <mka@...omium.org>
Cc:     linux-pm@...r.kernel.org, evgreen@...omium.org,
        bjorn.andersson@...aro.org, akashast@...eaurora.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] interconnect: Add helpers for enabling/disabling a path

Hi Matthias,

On 4/28/20 18:28, Matthias Kaehlcke wrote:
> Hi Georgi,
> 
> On Tue, Apr 28, 2020 at 12:16:50PM +0300, Georgi Djakov wrote:
>> There is a repeated pattern in multiple drivers where they want to switch
>> the bandwidth between zero and some other value. This is happening often
>> in the suspend/resume callbacks. Let's add helper functions to enable and
>> disable the path, so that callers don't have to take care of remembering
>> the bandwidth values and handle this in the framework instead.
>>
>> With this patch the users can call icc_disable() and icc_enable() to lower
>> their bandwidth request to zero and then restore it back to it's previous
>> value.
>>
>> Suggested-by: Evan Green <evgreen@...omium.org>
>> Suggested-by: Bjorn Andersson <bjorn.andersson@...aro.org>
>> Signed-off-by: Georgi Djakov <georgi.djakov@...aro.org>

[..]

>> +
>> +	return icc_set_bw(path, path->reqs[0].avg_bw,
>> +			  path->reqs[0].peak_bw);
>> +}
> 
> The two functions are identical except for the assignment of the 'enabled'
> flags. You could add a helper _icc_enable(struct icc_path *path, bool enable)
> and call it from icc_enable/disable().
> 

Yes, indeed! Will send a v2. Thank you!

BR,
Georgi