linux-kernel - Re: [PATCH 0/3] thermal/drivers/mediatek/lvts_thermal: Fixes to the interrupt handling

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Date:   Tue, 30 May 2023 15:46:48 -0400
From:   Nícolas F. R. A. Prado 
        <nfraprado@...labora.com>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>
Cc:     Chen-Yu Tsai <wenst@...omium.org>,
        Alexandre Bailon <abailon@...libre.com>, kernel@...labora.com,
        Balsam CHIHI <bchihi@...libre.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Alexandre Mergnat <amergnat@...libre.com>,
        Amit Kucheria <amitk@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Zhang Rui <rui.zhang@...el.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mediatek@...ts.infradead.org, linux-pm@...r.kernel.org
Subject: Re: [PATCH 0/3] thermal/drivers/mediatek/lvts_thermal: Fixes to the
 interrupt handling

On Tue, May 30, 2023 at 02:27:36PM +0200, Daniel Lezcano wrote:
> 
> Hi,
> 
> On 02/05/2023 12:33, Chen-Yu Tsai wrote:
> > On Fri, Apr 28, 2023 at 03:53:44PM -0400, Nícolas F. R. A. Prado wrote:
> > > 
> > > Fixes in the interrupt handling of the LVTS thermal driver noticed while
> > > testing it on the Spherion Chromebook (mt8192-asurada-spherion) with the
> > > MT8192 support series [1].
> > > 
> > > These are standalone fixes and don't depend on anything else.
> > > 
> > > [1] https://lore.kernel.org/all/20230307163413.143334-1-bchihi@baylibre.com/
> > > 
> > > Thanks,
> > > Nícolas
> > > 
> > > 
> > > Nícolas F. R. A. Prado (3):
> > >    thermal/drivers/mediatek/lvts_thermal: Handle IRQ on all controllers
> > >    thermal/drivers/mediatek/lvts_thermal: Honor sensors in immediate mode
> > >    thermal/drivers/mediatek/lvts_thermal: Disable undesired interrupts
> > 
> > This series seems to have solved all interrupt storm issue I ran into, so
> > 
> > Tested-by: Chen-Yu Tsai <wenst@...omium.org>
> 
> I gave a try on a mt8195 board and I don't see any interrupt firing when
> crossing the temperature thresholds.
> 
> Did I miss something ?

No, indeed interrupts seem to be completely disabled on mt8195, even after
setting the controllers to filtered mode (a requirement to get interrupts). I
haven't investigated that further yet. This series was validated on mt8192,
which did have working interrupts, but they were being triggered too often.

Also note that I've sent a v2 with even more fixes:
https://lore.kernel.org/all/20230504004852.627049-1-nfraprado@collabora.com/

Thanks,
Nícolas