linux-kernel - Re: [RESEND PATCH v6 2/4] media: chips-media: wave5: Support runtime suspend/resume

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Date: Fri, 21 Jun 2024 17:25:21 +0530
From: Devarsh Thakkar <devarsht@...com>
To: "jackson.lee" <jackson.lee@...psnmedia.com>,
        Nicolas Dufresne
	<nicolas.dufresne@...labora.com>,
        "mchehab@...nel.org" <mchehab@...nel.org>,
        "sebastian.fricke@...labora.com" <sebastian.fricke@...labora.com>
CC: "linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "hverkuil@...all.nl" <hverkuil@...all.nl>,
        Nas Chung
	<nas.chung@...psnmedia.com>,
        "lafley.kim" <lafley.kim@...psnmedia.com>,
        "b-brnich@...com" <b-brnich@...com>, "Luthra, Jai" <j-luthra@...com>,
        Vibhore
	<vibhore@...com>, Dhruva Gole <d-gole@...com>,
        Aradhya <a-bhatia1@...com>, "Raghavendra, Vignesh" <vigneshr@...com>
Subject: Re: [RESEND PATCH v6 2/4] media: chips-media: wave5: Support runtime
 suspend/resume

Hi Jackson,

On 21/06/24 06:00, jackson.lee wrote:
> Hi Nicolas / Devarsh
> 
> 
> There are lots of mail thread in the loop, I have confusion.
> I'd like to make check-up list for the "Support runtime suspend/resume" patch.
> 
> 1. Profiling resume latency
> 2. after that, adjusting the time.
> 

Beyond above two points,

3. I think this patchset also breaks hrtimer polling and so the VPU operation
on AM62A which completely relies on polling, you can test with removing the
interrupt property from your dts file before/after this patch-set. With the
polling it needs to be taken care that polling is started only after device is
on power-on state and is stopped before device gets suspended.

4. There is some discussion going on between me and Nicholas on whether
delayed suspend is really required after last instance close or not. My
thought was that we should suspend immediately after last instance close, but
Nicolas mentioned some concerns w.r.t use-cases such as gapless playback so I
am following up with him.

Regards
Devarsh