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SubjectRe: [PATCH v2 0/3] RK3288 Gamma LUT
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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(-)
>

Any other feedback on this series? If you are happy with the approach now,
I am wondering if you can take it or if it's way too late.

Thanks,
Eze


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