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drm/vc4: Add CTM support

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The hardware has a single block for applying a CTM prior to gamma lut.
It can be fed with pixels from one of our CRTC at a time and uses a
matrix with S0.9 scalars. Use private atomic state to reject attempts
from userland to apply CTM for more than one CRTC at a time and reject
matrices with scalars that we can't approximate without integer bits.

Signed-off-by: Stefan Schake <stschake@gmail.com>
Signed-off-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Eric Anholt <eric@anholt.net>
Link: https://patchwork.freedesktop.org/patch/218067/
This commit is contained in:
Stefan Schake
2018-04-20 05:25:44 -07:00
committed by Eric Anholt
parent 22445f0316
commit 766cc6b1f7
4 changed files with 215 additions and 1 deletions
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3
drivers/gpu/drm/vc4/vc4_drv.c
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@@ -319,6 +319,7 @@ dev_unref:
static void vc4_drm_unbind(struct device *dev)
{
struct drm_device *drm = dev_get_drvdata(dev);
struct vc4_dev *vc4 = to_vc4_dev(drm);
drm_dev_unregister(drm);
@@ -326,6 +327,8 @@ static void vc4_drm_unbind(struct device *dev)
drm_mode_config_cleanup(drm);
drm_atomic_private_obj_fini(&vc4->ctm_manager);
drm_dev_unref(drm);
}