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charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Added Hien-san, Michael K. from Renesas. -----Original Message----- From: Geert Uytterhoeven Sent: Mittwoch, 27. Mai 2020 09:35 To: REE erosca@DE.ADIT-JV.COM Cc: Jacopo Mondi ; Laurent Pinchart ; Kieran Bingham ; Simon Horman ; Ulrich Hecht ; VenkataRajesh.Kalakodima@in.bosch.com; David Airlie ; Daniel Vetter ; KOJI MATSUOKA ; muroya@ksk.co.jp; Harsha.ManjulaMallikarjun@in.bosch.com; Ezequiel Garcia ; Sean Paul ; Linux-Renesas ; DRI Development ; Linux Kernel Mailing List ; Michael Dege ; Gotthard Voellmeke ; REE efriedrich@DE.ADIT-JV.COM ; Michael Rodin ; ChaitanyaKumar.Borah@in.bosch.com; Eugeniu Rosca 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 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 Renesas Electronics Europe GmbH, Geschaeftsfuehrer/President: Carsten Jauch, Sitz der Gesellschaft/Registered office: Duesseldorf, Arcadiastrasse 10, 40472 Duesseldorf, Germany, Handelsregister/Commercial Register: Duesseldorf, HRB 3708 USt-IDNr./Tax identification no.: DE 119353406 WEEE-Reg.-Nr./WEEE reg. no.: DE 14978647 _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel