Added Hien-san, Michael K. from Renesas.
-----Original Message----- From: Geert Uytterhoeven geert@linux-m68k.org Sent: Mittwoch, 27. Mai 2020 09:35 To: REE erosca@DE.ADIT-JV.COM erosca@DE.ADIT-JV.COM Cc: Jacopo Mondi jacopo+renesas@jmondi.org; Laurent Pinchart laurent.pinchart@ideasonboard.com; Kieran Bingham kieran.bingham+renesas@ideasonboard.com; Simon Horman horms@verge.net.au; Ulrich Hecht uli+renesas@fpond.eu; VenkataRajesh.Kalakodima@in.bosch.com; David Airlie airlied@linux.ie; Daniel Vetter daniel@ffwll.ch; KOJI MATSUOKA koji.matsuoka.xm@renesas.com; muroya@ksk.co.jp; Harsha.ManjulaMallikarjun@in.bosch.com; Ezequiel Garcia ezequiel@collabora.com; Sean Paul seanpaul@chromium.org; Linux-Renesas linux-renesas-soc@vger.kernel.org; DRI Development dri-devel@lists.freedesktop.org; Linux Kernel Mailing List linux-kernel@vger.kernel.org; Michael Dege michael.dege@renesas.com; Gotthard Voellmeke gotthard.voellmeke@renesas.com; REE efriedrich@DE.ADIT-JV.COM efriedrich@DE.ADIT-JV.COM; Michael Rodin mrodin@de.adit-jv.com; ChaitanyaKumar.Borah@in.bosch.com; Eugeniu Rosca roscaeugeniu@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 erosca@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 -- geert@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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