linux-kernel - Re: [PATCH v2 0/3] RK3288 Gamma LUT

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Date:   Tue, 2 Jul 2019 13:14:24 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     Ezequiel Garcia <ezequiel@...labora.com>
Cc:     Heiko Stübner <heiko@...ech.de>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        "open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
        Sandy Huang <hjc@...k-chips.com>, kernel@...labora.com,
        Sean Paul <seanpaul@...omium.org>,
        Boris Brezillon <boris.brezillon@...labora.com>,
        Jacopo Mondi <jacopo@...ndi.org>,
        Ilia Mirkin <imirkin@...m.mit.edu>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        devicetree@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 0/3] RK3288 Gamma LUT

Hi,

On Tue, Jul 2, 2019 at 4:26 AM Ezequiel Garcia <ezequiel@...labora.com> wrote:
>
> Hi Heiko,
>
> On Fri, 2019-06-21 at 18:13 -0300, Ezequiel Garcia wrote:
> > Let's support Gamma LUT configuration on RK3288 SoCs.
> >
> > In order to do so, this series adds a new and optional
> > address resource.
> >
> > A separate address resource is required because on this RK3288,
> > the LUT address is after the MMU address, which is requested
> > by the iommu driver. This prevents the DRM driver
> > from requesting an entire register space.
> >
> > The current implementation works for RGB 10-bit tables, as that
> > is what seems to work on RK3288.
> >
> > This has been tested on a Rock2 Square board, using
> > a hacked 'modetest' tool, with legacy and atomic APIs.
> >
> > Thanks,
> > Eze
> >
> > Changes from v1:
> > * drop explicit linear LUT after finding a proper
> >   way to disable gamma correction.
> > * avoid setting gamma is the CRTC is not active.
> > * s/int/unsigned int as suggested by Jacopo.
> > * only enable color management and set gamma size
> >   if gamma LUT is supported, suggested by Doug.
> > * drop the reg-names usage, and instead just use indexed reg
> >   specifiers, suggested by Doug.
> >
> > Changes from RFC:
> > * Request (an optional) address resource for the LUT.
> > * Add devicetree changes.
> > * Drop support for RK3399, which doesn't seem to work
> >   out of the box and needs more research.
> > * Support pass-thru setting when GAMMA_LUT is NULL.
> > * Add a check for the gamma size, as suggested by Ilia.
> > * Move gamma setting to atomic_commit_tail, as pointed
> >   out by Jacopo/Laurent, is the correct way.
> >
> > Ezequiel Garcia (3):
> >   dt-bindings: display: rockchip: document VOP gamma LUT address
> >   drm/rockchip: Add optional support for CRTC gamma LUT
> >   ARM: dts: rockchip: Add RK3288 VOP gamma LUT address
> >
> >  .../display/rockchip/rockchip-vop.txt         |   6 +-
> >  arch/arm/boot/dts/rk3288.dtsi                 |   4 +-
> >  drivers/gpu/drm/rockchip/rockchip_drm_fb.c    |   3 +
> >  drivers/gpu/drm/rockchip/rockchip_drm_vop.c   | 114 ++++++++++++++++++
> >  drivers/gpu/drm/rockchip/rockchip_drm_vop.h   |   7 ++
> >  drivers/gpu/drm/rockchip/rockchip_vop_reg.c   |   2 +
> >  6 files changed, 133 insertions(+), 3 deletions(-)

I will note that I can confirm that the "gamma_test" app present on
Chrome OS can be shown to work with this series, both on eDP and HDMI.
I see a nice shiny RGB pattern on the screen.  Thus:

Tested-by: Douglas Anderson <dianders@...omium.org>