Added Hien-san, Michael K. from Renesas. -----Original Message----- From: Geert Uytterhoeven <[email protected]> Sent: Mittwoch, 27. Mai 2020 09:35 To: REE [email protected] <[email protected]> Cc: Jacopo Mondi <[email protected]>; Laurent Pinchart <[email protected]>; Kieran Bingham <[email protected]>; Simon Horman <[email protected]>; Ulrich Hecht <[email protected]>; [email protected]; David Airlie <[email protected]>; Daniel Vetter <[email protected]>; KOJI MATSUOKA <[email protected]>; [email protected]; [email protected]; Ezequiel Garcia <[email protected]>; Sean Paul <[email protected]>; Linux-Renesas <[email protected]>; DRI Development <[email protected]>; Linux Kernel Mailing List <[email protected]>; Michael Dege <[email protected]>; Gotthard Voellmeke <[email protected]>; REE [email protected] <[email protected]>; Michael Rodin <[email protected]>; [email protected]; Eugeniu Rosca <[email protected]> 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 <[email protected]> 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 -- [email protected] 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 [email protected] https://lists.freedesktop.org/mailman/listinfo/dri-devel
