linux-kernel - Re: [alsa-devel] [PATCH 15/27] ALSA: hda - Use timecounter

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Message-ID: <1a9a1507-7ca3-459b-c2ce-02fc2afad2ff@intel.com>
Date:   Tue, 2 Jan 2018 11:33:41 +0530
From:   Sagar Arun Kamble <sagar.a.kamble@...el.com>
To:     Richard Cochran <richardcochran@...il.com>
Cc:     Takashi Iwai <tiwai@...e.de>, linux-kernel@...r.kernel.org,
        alsa-devel@...a-project.org, Vinod Koul <vinod.koul@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [alsa-devel] [PATCH 15/27] ALSA: hda - Use timecounter_initialize
 interface



On 12/28/2017 10:19 PM, Richard Cochran wrote:
> On Tue, Dec 26, 2017 at 01:07:35PM +0530, Sagar Arun Kamble wrote:
>>> Or can we provide simpler versions for covering some defaults?  At
>>> least reducing the number of arguments would make things easier.
>> Thought about specifying 1. cyclecounter read func 2. frequency 3. width of
>> counter as parameters here
>> which can get rid of mult, shift params. But this is not easy as most of the
>> drivers do not specify
>> cyclecounter frequency and instead hard-code the mult/shift factors.
> You are talking about using clocks_calc_mult_shift() here, right? (See
> the usage example in drivers/net/ethernet/ti/cpts.c).
Yes
> This is a good idea, and it is worth getting the driver authors' input
> to figure out the correct parameters.
>
> I bet we can use that almost everywhere.  If there are any drivers
> that cannot be converted, then we can leave some sort of low level
> legacy initialization method.
Agree
> Thanks,
> Richard
>