Hello Sean,
On Mon, 2019-10-07 at 14:54 -0400, Sean Paul wrote:
> On Mon, Sep 30, 2019 at 07:28:00PM -0300, Ezequiel Garcia wrote:
> > Add an optional CRTC gamma LUT support, and enable it on RK3288.
> > This is currently enabled via a separate address resource,
> > which needs to be specified in the devicetree.
> >
> > The address resource is required because on some SoCs, such as
> > RK3288, the LUT address is after the MMU address, and the latter
> > is supported by a different 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.
> >
> > Signed-off-by: Ezequiel Garcia <ezequiel@xxxxxxxxxxxxx>
> > Reviewed-by: Douglas Anderson <dianders@xxxxxxxxxxxx>
> > Reviewed-by: Jacopo Mondi <jacopo+renesas@xxxxxxxxxx>
> > ---
> > Changes from v2:
> > * None.
> >
> > 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.
> > * 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.
> > ---
> > 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 +
> > 4 files changed, 126 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_fb.c b/drivers/gpu/drm/rockchip/rockchip_drm_fb.c
> > index dba352ec0ee3..fd1d987698ab 100644
> > --- a/drivers/gpu/drm/rockchip/rockchip_drm_fb.c
> > +++ b/drivers/gpu/drm/rockchip/rockchip_drm_fb.c
> > @@ -17,6 +17,7 @@
> > #include "rockchip_drm_drv.h"
> > #include "rockchip_drm_fb.h"
> > #include "rockchip_drm_gem.h"
> > +#include "rockchip_drm_vop.h"
> >
> > static const struct drm_framebuffer_funcs rockchip_drm_fb_funcs = {
> > .destroy = drm_gem_fb_destroy,
> > @@ -112,6 +113,8 @@ rockchip_atomic_helper_commit_tail_rpm(struct drm_atomic_state *old_state)
> >
> > drm_atomic_helper_commit_modeset_disables(dev, old_state);
> >
> > + rockchip_drm_vop_gamma_set(old_state);
> > +
>
> Instead of duplicating the commit_tail helper, could you just implement
> .atomic_begin() and call this from there? I think the only hitch is if you
> need this to be completed before crtc->atomic_enable(), at which point you
> might need to call it from vop_crtc_atomic_enable() and then detect that in
> atomic_begin()
>
I think moving this to .atomic_begin might be enough. Let me send a new
series and we can see how that goes.
Thanks for reviewing,
Ezequiel
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