Added Hien-san, Michael K. from Renesas.
-----Original Message-----
From: Geert Uytterhoeven <ge...@linux-m68k.org>
Sent: Mittwoch, 27. Mai 2020 09:35
To: REE ero...@de.adit-jv.com <ero...@de.adit-jv.com>
Cc: Jacopo Mondi <jacopo+rene...@jmondi.org>; Laurent Pinchart
<laurent.pinch...@ideasonboard.com>; Kieran Bingham
<kieran.bingham+rene...@ideasonboard.com>; Simon Horman <ho...@verge.net.au>;
Ulrich Hecht <uli+rene...@fpond.eu>; venkatarajesh.kalakod...@in.bosch.com;
David Airlie <airl...@linux.ie>; Daniel Vetter <dan...@ffwll.ch>; KOJI MATSUOKA
<koji.matsuoka...@renesas.com>; mur...@ksk.co.jp;
harsha.manjulamallikar...@in.bosch.com; Ezequiel Garcia
<ezequ...@collabora.com>; Sean Paul <seanp...@chromium.org>; Linux-Renesas
<linux-renesas-...@vger.kernel.org>; DRI Development
<dri-devel@lists.freedesktop.org>; Linux Kernel Mailing List
<linux-ker...@vger.kernel.org>; Michael Dege <michael.d...@renesas.com>;
Gotthard Voellmeke <gotthard.voellm...@renesas.com>; REE
efriedr...@de.adit-jv.com <efriedr...@de.adit-jv.com>; Michael Rodin
<mro...@de.adit-jv.com>; chaitanyakumar.bo...@in.bosch.com; Eugeniu Rosca
<roscaeuge...@gmail.com>
Subject: Re: [PATCH v5 0/8] drm: rcar-du: Add Color Management Module (CMM)
Hi Eugeniu,
On Wed, May 27, 2020 at 9:16 AM Eugeniu Rosca <ero...@de.adit-jv.com> wrote:
> On Tue, Oct 15, 2019 at 12:46:13PM +0200, Jacopo Mondi wrote:
> > CMM functionalities are retained between suspend/resume cycles (tested with
> > suspend-to-idle) without requiring a re-programming of the LUT tables.
>
> Hmm. Is this backed up by any statement in the HW User's manual?
> This comes in contrast with the original Renesas CMM implementation [**]
> which does make use of suspend (where the freeze actually happens).
>
> Can we infer, based on your statement, that we could also get rid of
> the suspend callback in [**]?
While the CMM state will be retained across suspend-to-idle, I'm quite
sure it will be lost by suspend-to-RAM, at least on the Salvator-X(S),
ULCB, and Ebisu development boards, as PSCI will ask the BD9571WMV
regulator to power down the R-Car SoC.
So IMHO we do need suspend/resume handling.
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- ge...@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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