drm/ingenic: crtc: Switch to ingenic_drm_get_new_priv_state()

The ingenic CRTC atomic_enable() implementation will indirectly call
drm_atomic_get_private_obj_state() through ingenic_drm_get_priv_state().

drm_atomic_get_private_obj_state() will either return the new state for
the object in the global state if it exists, or will allocate a new one
and add it to the global state.

atomic_enable() however isn't allowed to modify the global state. So
what the implementation should use is the
drm_atomic_get_new_private_obj_state() helper to get the new state for
the CRTC, without performing an extra allocation.

We still need to make sure the private state will be part of the global
state by the time atomic_enable runs, so we still need to call
ingenic_drm_get_priv_state() in atomic_check. We can then call
ingenic_drm_get_new_priv_state() in atomic_enable, which is a wrapper
around drm_atomic_get_new_private_obj_state().

Reported-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Suggested-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Paul Cercueil <paul@crapouillou.net>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://lore.kernel.org/r/20250930-drm-no-more-existing-state-v5-37-eeb9e1287907@kernel.org
Signed-off-by: Maxime Ripard <mripard@kernel.org>

diff --git a/drivers/gpu/drm/ingenic/ingenic-drm-drv.c b/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
index 05faed933e5619c796f2a4fa1906e0eaa029ac68..d3213fbf22be14b177fc1b7100c5b721d5f17924 100644 (file)
--- a/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
+++ b/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
@@ -247,8 +247,8 @@ static void ingenic_drm_crtc_atomic_enable(struct drm_crtc *crtc,
        struct ingenic_drm_private_state *priv_state;
        unsigned int next_id;
 
-       priv_state = ingenic_drm_get_priv_state(priv, state);
-       if (WARN_ON(IS_ERR(priv_state)))
+       priv_state = ingenic_drm_get_new_priv_state(priv, state);
+       if (WARN_ON(!priv_state))
                return;
 
        /* Set addresses of our DMA descriptor chains */
@@ -340,6 +340,7 @@ static int ingenic_drm_crtc_atomic_check(struct drm_crtc *crtc,
                                                                          crtc);
        struct ingenic_drm *priv = drm_crtc_get_priv(crtc);
        struct drm_plane_state *f1_state, *f0_state, *ipu_state = NULL;
+       struct ingenic_drm_private_state *priv_state;
 
        if (crtc_state->gamma_lut &&
            drm_color_lut_size(crtc_state->gamma_lut) != ARRAY_SIZE(priv->dma_hwdescs->palette)) {
@@ -347,6 +348,11 @@ static int ingenic_drm_crtc_atomic_check(struct drm_crtc *crtc,
                return -EINVAL;
        }
 
+       /* We will need the state in atomic_enable, so let's make sure it's part of the state */
+       priv_state = ingenic_drm_get_priv_state(priv, state);
+       if (IS_ERR(priv_state))
+               return PTR_ERR(priv_state);
+
        if (drm_atomic_crtc_needs_modeset(crtc_state) && priv->soc_info->has_osd) {
                f1_state = drm_atomic_get_plane_state(crtc_state->state,
                                                      &priv->f1);