drm: Use mode_valid() in atomic modeset

This patches makes use of the new mode_valid() callbacks introduced
previously to validate the full video pipeline when modesetting.

This calls the connector->mode_valid(), encoder->mode_valid(),
bridge->mode_valid() and crtc->mode_valid() so that we can
make sure that the mode will be accepted in every components.

Signed-off-by: Jose Abreu <joabreu@synopsys.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Andrzej Hajda <a.hajda@samsung.com>
Cc: Carlos Palminha <palminha@synopsys.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Dave Airlie <airlied@linux.ie>
Cc: Andrzej Hajda <a.hajda@samsung.com>
Cc: Archit Taneja <architt@codeaurora.org>
Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Changes v1->v2:
	- Removed call to connector->mode_valid (Ville, Daniel)
	- Changed function name (Ville)
	- Use for_each_new_connector_in_state (Ville)
	- Do not validate if connector and mode didn't change (Ville)
	- Use new helpers to call mode_valid

Signed-off-by: Jose Abreu <joabreu@synopsys.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/a457d6a69ad07b3936304653c919068c430c0857.1495720737.git.joabreu@synopsys.com

diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index 636e561486a8f813b806a9ba7ec9e94ad1a6298c..93b0221d5d0fd41ae0602cfe9559683eba2365af 100644 (file)
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -32,6 +32,7 @@
 #include <drm/drm_atomic_helper.h>
 #include <linux/dma-fence.h>
 
+#include "drm_crtc_helper_internal.h"
 #include "drm_crtc_internal.h"
 
 /**
@@ -452,6 +453,69 @@ mode_fixup(struct drm_atomic_state *state)
        return 0;
 }
 
+static enum drm_mode_status mode_valid_path(struct drm_connector *connector,
+                                           struct drm_encoder *encoder,
+                                           struct drm_crtc *crtc,
+                                           struct drm_display_mode *mode)
+{
+       enum drm_mode_status ret;
+
+       ret = drm_encoder_mode_valid(encoder, mode);
+       if (ret != MODE_OK) {
+               DRM_DEBUG_ATOMIC("[ENCODER:%d:%s] mode_valid() failed\n",
+                               encoder->base.id, encoder->name);
+               return ret;
+       }
+
+       ret = drm_bridge_mode_valid(encoder->bridge, mode);
+       if (ret != MODE_OK) {
+               DRM_DEBUG_ATOMIC("[BRIDGE] mode_valid() failed\n");
+               return ret;
+       }
+
+       ret = drm_crtc_mode_valid(crtc, mode);
+       if (ret != MODE_OK) {
+               DRM_DEBUG_ATOMIC("[CRTC:%d:%s] mode_valid() failed\n",
+                               crtc->base.id, crtc->name);
+               return ret;
+       }
+
+       return ret;
+}
+
+static int
+mode_valid(struct drm_atomic_state *state)
+{
+       struct drm_connector_state *conn_state;
+       struct drm_connector *connector;
+       int i;
+
+       for_each_new_connector_in_state(state, connector, conn_state, i) {
+               struct drm_encoder *encoder = conn_state->best_encoder;
+               struct drm_crtc *crtc = conn_state->crtc;
+               struct drm_crtc_state *crtc_state;
+               enum drm_mode_status mode_status;
+               struct drm_display_mode *mode;
+
+               if (!crtc || !encoder)
+                       continue;
+
+               crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
+               if (!crtc_state)
+                       continue;
+               if (!crtc_state->mode_changed && !crtc_state->connectors_changed)
+                       continue;
+
+               mode = &crtc_state->mode;
+
+               mode_status = mode_valid_path(connector, encoder, crtc, mode);
+               if (mode_status != MODE_OK)
+                       return -EINVAL;
+       }
+
+       return 0;
+}
+
 /**
  * drm_atomic_helper_check_modeset - validate state object for modeset changes
  * @dev: DRM device
@@ -466,13 +530,15 @@ mode_fixup(struct drm_atomic_state *state)
  * 2. &drm_connector_helper_funcs.atomic_check to validate the connector state.
  * 3. If it's determined a modeset is needed then all connectors on the affected crtc
  *    crtc are added and &drm_connector_helper_funcs.atomic_check is run on them.
- * 4. &drm_bridge_funcs.mode_fixup is called on all encoder bridges.
- * 5. &drm_encoder_helper_funcs.atomic_check is called to validate any encoder state.
+ * 4. &drm_encoder_helper_funcs.mode_valid, &drm_bridge_funcs.mode_valid and
+ *    &drm_crtc_helper_funcs.mode_valid are called on the affected components.
+ * 5. &drm_bridge_funcs.mode_fixup is called on all encoder bridges.
+ * 6. &drm_encoder_helper_funcs.atomic_check is called to validate any encoder state.
  *    This function is only called when the encoder will be part of a configured crtc,
  *    it must not be used for implementing connector property validation.
  *    If this function is NULL, &drm_atomic_encoder_helper_funcs.mode_fixup is called
  *    instead.
- * 6. &drm_crtc_helper_funcs.mode_fixup is called last, to fix up the mode with crtc constraints.
+ * 7. &drm_crtc_helper_funcs.mode_fixup is called last, to fix up the mode with crtc constraints.
  *
  * &drm_crtc_state.mode_changed is set when the input mode is changed.
  * &drm_crtc_state.connectors_changed is set when a connector is added or
@@ -617,6 +683,10 @@ drm_atomic_helper_check_modeset(struct drm_device *dev,
                        return ret;
        }
 
+       ret = mode_valid(state);
+       if (ret)
+               return ret;
+
        return mode_fixup(state);
 }
 EXPORT_SYMBOL(drm_atomic_helper_check_modeset);