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

[Laurent Pinchart]

On Fri, Jun 05, 2020 at 03:29:00PM +0200, Jacopo Mondi wrote:
> Hello Eugeniu,
>    sorry for the late reply
> 
> On Wed, May 27, 2020 at 09:15:55AM +0200, Eugeniu Rosca wrote:
> > Hi Jacopo,
> >
> > On Tue, Oct 15, 2019 at 12:46:13PM +0200, Jacopo Mondi wrote:
> >  ----8<---
> >
> > > * Testing
> > > I have tested by injecting a color inversion LUT table and enabling/disabling it
> > > every 50 displayed frames:
> > > https://jmondi.org/cgit/kmsxx/log/?h=gamma_lut
> >
> > Could you kindly share the cross compilation steps for your kmsxx fork?
> 
> I usually build it on the target :)

Otherwise, cross-compilation instructions are available in README.md.

$ mkdir build
$ cd build
$ cmake -DCMAKE_TOOLCHAIN_FILE=<buildrootpath>/output/host/usr/share/buildroot/toolchainfile.cmake ..
$ make -j4

I assume you may use yocto instead of buildroot, you would have to
locate the toolchainfile.cmake file accordingly.

> > 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 ?
> 
> > 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.
> 
> > [*] 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

-- 
Regards,

Laurent Pinchart