Stefan Schake <stschake@xxxxxxxxx> writes:
> We are an atomic driver so the gamma LUT should also be exposed as a
> CRTC property through the DRM atomic color management. This will also
> take care of the legacy path for us.
>
> Signed-off-by: Stefan Schake <stschake@xxxxxxxxx>
> ---
> v2: Use drm_color_lut_size for LUT length
>
> drivers/gpu/drm/vc4/vc4_crtc.c | 24 +++++++++++++-----------
> 1 file changed, 13 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/gpu/drm/vc4/vc4_crtc.c b/drivers/gpu/drm/vc4/vc4_crtc.c
> index bf4667481935..239215cb3274 100644
> --- a/drivers/gpu/drm/vc4/vc4_crtc.c
> +++ b/drivers/gpu/drm/vc4/vc4_crtc.c
> @@ -298,23 +298,21 @@ vc4_crtc_lut_load(struct drm_crtc *crtc)
> HVS_WRITE(SCALER_GAMDATA, vc4_crtc->lut_b[i]);
> }
>
> -static int
> -vc4_crtc_gamma_set(struct drm_crtc *crtc, u16 *r, u16 *g, u16 *b,
> - uint32_t size,
> - struct drm_modeset_acquire_ctx *ctx)
> +static void
> +vc4_crtc_update_gamma_lut(struct drm_crtc *crtc)
> {
> struct vc4_crtc *vc4_crtc = to_vc4_crtc(crtc);
> + struct drm_color_lut *lut = crtc->state->gamma_lut->data;
> + u32 length = drm_color_lut_size(crtc->state->gamma_lut);
> u32 i;
>
> - for (i = 0; i < size; i++) {
> - vc4_crtc->lut_r[i] = r[i] >> 8;
> - vc4_crtc->lut_g[i] = g[i] >> 8;
> - vc4_crtc->lut_b[i] = b[i] >> 8;
> + for (i = 0; i < length; i++) {
> + vc4_crtc->lut_r[i] = drm_color_lut_extract(lut[i].red, 8);
> + vc4_crtc->lut_g[i] = drm_color_lut_extract(lut[i].green, 8);
> + vc4_crtc->lut_b[i] = drm_color_lut_extract(lut[i].blue, 8);
> }
>
> vc4_crtc_lut_load(crtc);
> -
> - return 0;
> }
>
> static u32 vc4_get_fifo_full_level(u32 format)
> @@ -699,6 +697,9 @@ static void vc4_crtc_atomic_flush(struct drm_crtc *crtc,
> if (crtc->state->active && old_state->active)
> vc4_crtc_update_dlist(crtc);
>
> + if (crtc->state->color_mgmt_changed && crtc->state->gamma_lut)
> + vc4_crtc_update_gamma_lut(crtc);
Don't we need to set things back to linear if gamma_lut is NULL? (maybe
by updating the SCALER_DISPBKGND_GAMMA flag on the HVS channel)
Other than that, this looks great.
> +
> if (debug_dump_regs) {
> DRM_INFO("CRTC %d HVS after:\n", drm_crtc_index(crtc));
> vc4_hvs_dump_state(dev);
> @@ -909,7 +910,7 @@ static const struct drm_crtc_funcs vc4_crtc_funcs = {
> .reset = vc4_crtc_reset,
> .atomic_duplicate_state = vc4_crtc_duplicate_state,
> .atomic_destroy_state = vc4_crtc_destroy_state,
> - .gamma_set = vc4_crtc_gamma_set,
> + .gamma_set = drm_atomic_helper_legacy_gamma_set,
> .enable_vblank = vc4_enable_vblank,
> .disable_vblank = vc4_disable_vblank,
> };
> @@ -1035,6 +1036,7 @@ static int vc4_crtc_bind(struct device *dev, struct device *master, void *data)
> primary_plane->crtc = crtc;
> vc4_crtc->channel = vc4_crtc->data->hvs_channel;
> drm_mode_crtc_set_gamma_size(crtc, ARRAY_SIZE(vc4_crtc->lut_r));
> + drm_crtc_enable_color_mgmt(crtc, 0, false, crtc->gamma_size);
>
> /* Set up some arbitrary number of planes. We're not limited
> * by a set number of physical registers, just the space in
> --
> 2.14.1
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