Some platforms are not able to maintain the color transformation state after a system suspend/resume cycle.
Set the colog_mgmt_changed flag so that CMM on the CRTCs in the suspend state are reapplied after system resume. Signed-off-by: Ezequiel Garcia <ezequ...@collabora.com> --- This is an RFC, and it's mostly based on Jacopo Mondi's work https://lkml.org/lkml/2019/9/6/498. Changes from v2: * New patch. --- drivers/gpu/drm/drm_atomic_helper.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c index e41db0f202ca..518488125575 100644 --- a/drivers/gpu/drm/drm_atomic_helper.c +++ b/drivers/gpu/drm/drm_atomic_helper.c @@ -3234,8 +3234,20 @@ int drm_atomic_helper_resume(struct drm_device *dev, struct drm_atomic_state *state) { struct drm_modeset_acquire_ctx ctx; + struct drm_crtc_state *crtc_state; + struct drm_crtc *crtc; + unsigned int i; int err; + for_each_new_crtc_in_state(state, crtc, crtc_state, i) { + /* + * Force re-enablement of CMM after system resume if any + * of the DRM color transformation properties was set in + * the state saved at system suspend time. + */ + if (crtc_state->gamma_lut) + crtc_state->color_mgmt_changed = true; + } drm_mode_config_reset(dev); DRM_MODESET_LOCK_ALL_BEGIN(dev, ctx, 0, err); -- 2.22.0
