linux-kernel - Re: [PATCH v5 0/8] drm: rcar-du: Add Color Management Module (CMM)

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Date:   Fri, 5 Jun 2020 15:53:15 +0200
From:   Jacopo Mondi <jacopo@...ndi.org>
To:     Eugeniu Rosca <erosca@...adit-jv.com>
Cc:     Jacopo Mondi <jacopo+renesas@...ndi.org>,
        laurent.pinchart@...asonboard.com,
        kieran.bingham+renesas@...asonboard.com, geert@...ux-m68k.org,
        horms@...ge.net.au, uli+renesas@...nd.eu,
        VenkataRajesh.Kalakodima@...bosch.com, airlied@...ux.ie,
        daniel@...ll.ch, koji.matsuoka.xm@...esas.com, muroya@....co.jp,
        Harsha.ManjulaMallikarjun@...bosch.com, ezequiel@...labora.com,
        seanpaul@...omium.org, linux-renesas-soc@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        michael.dege@...esas.com, gotthard.voellmeke@...esas.com,
        efriedrich@...adit-jv.com, mrodin@...adit-jv.com,
        ChaitanyaKumar.Borah@...bosch.com,
        Eugeniu Rosca <roscaeugeniu@...il.com>
Subject: Re: [PATCH v5 0/8] drm: rcar-du: Add Color Management Module (CMM)

Hi Eugeniu

On Fri, Jun 05, 2020 at 03:41:24PM +0200, Eugeniu Rosca wrote:
> Hi Jacopo,
>
> On Fri, Jun 05, 2020 at 03:29:00PM +0200, Jacopo Mondi wrote:
> > On Wed, May 27, 2020 at 09:15:55AM +0200, Eugeniu Rosca wrote:
> > > Could you kindly share the cross compilation steps for your kmsxx fork?
> >
> > I usually build it on the target :)
>
> Interesting approach. With ARM getting more and more potent, why not? :)
>

For 'small' utilities like kmsxx it's doable

> >
> > > Just out of curiosity, have you ever tried to pull the display's HDMI
> > > cable while reading from CM2_LUT_TBL?
> >
> > Ahem, not really :) Did I get you right, you mean disconnecting the
> > HDMI cable from the board ?
>
> Right.
>

So, no, I have not tried. Do you see any intersting failure with the
mainline version ?

> > >
> > > At least with the out-of-tree CMM implementation [*], this sends the
> > > R-Car3 reference targets into an unrecoverable freeze, with no lockup
> > > reported by the kernel (i.e. looks like an serious HW issue).
> > >
> > > >
> > > > 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 [**]?
> >
> > As Geert (thanks) explained what I've tested with is suspend-to-idle,
> > which retains the state of the LUT tables (and I assume other
> > not-yet-implemented CMM features, like CLU). I recall the out-of-tree
> > driver has suspend/resume routines but I never really tested that.
>
> I see. JFYI, there is a flaw in the suspend handling in the out-of-tree
> CMM patch [*], which renders the SoC unresponsive on HDMI hotplug. The
> fix is currently under review. Hopefully it will make its way to [*]
> in the nearest future. Just to keep in mind for the moment when CMM
> s2ram will become a mainline feature.

Thanks, let's keep this in mind. Next week I'll run a few tests again
with s2ram and will get back to you.

Thanks
  j

>
> > >
> > > [*] https://github.com/renesas-rcar/du_cmm
> > > [**] https://github.com/renesas-rcar/du_cmm/blob/c393ed49834bdbc/meta-rcar-gen3/recipes-kernel/linux/linux-renesas/0001-drm-rcar-du-Add-DU-CMM-support.patch#L1912
>
> --
> Best regards,
> Eugeniu Rosca