1 files changed, 164 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/intel_atomic.c b/drivers/gpu/drm/i915/intel_atomic.c
new file mode 100644
index 000000000000..5c31f54a3711
--- /dev/null
+++ b/drivers/gpu/drm/i915/intel_atomic.c
@@ -0,0 +1,164 @@
+/*
+ * Copyright © 2015 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+/**
+ * DOC: atomic modeset support
+ *
+ * The functions here implement the state management and hardware programming
+ * dispatch required by the atomic modeset infrastructure.
+ * See intel_atomic_plane.c for the plane-specific atomic functionality.
+ */
+
+#include <drm/drmP.h>
+#include <drm/drm_atomic.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_plane_helper.h>
+#include "intel_drv.h"
+
+
+/**
+ * intel_atomic_check - validate state object
+ * @dev: drm device
+ * @state: state to validate
+ */
+int intel_atomic_check(struct drm_device *dev,
+                       struct drm_atomic_state *state)
+{
+        int nplanes = dev->mode_config.num_total_plane;
+        int ncrtcs = dev->mode_config.num_crtc;
+        int nconnectors = dev->mode_config.num_connector;
+        enum pipe nuclear_pipe = INVALID_PIPE;
+        int ret;
+        int i;
+        bool not_nuclear = false;
+
+        /*
+         * FIXME:  At the moment, we only support "nuclear pageflip" on a
+         * single CRTC.  Cross-crtc updates will be added later.
+         */
+        for (i = 0; i < nplanes; i++) {
+                struct intel_plane *plane = to_intel_plane(state->planes[i]);
+                if (!plane)
+                        continue;
+
+                if (nuclear_pipe == INVALID_PIPE) {
+                        nuclear_pipe = plane->pipe;
+                } else if (nuclear_pipe != plane->pipe) {
+                        DRM_DEBUG_KMS("i915 only support atomic plane operations on a single CRTC at the moment\n");
+                        return -EINVAL;
+                }
+        }
+
+        /*
+         * FIXME:  We only handle planes for now; make sure there are no CRTC's
+         * or connectors involved.
+         */
+        state->allow_modeset = false;
+        for (i = 0; i < ncrtcs; i++) {
+                struct intel_crtc *crtc = to_intel_crtc(state->crtcs[i]);
+                if (crtc && crtc->pipe != nuclear_pipe)
+                        not_nuclear = true;
+        }
+        for (i = 0; i < nconnectors; i++)
+                if (state->connectors[i] != NULL)
+                        not_nuclear = true;
+
+        if (not_nuclear) {
+                DRM_DEBUG_KMS("i915 only supports atomic plane operations at the moment\n");
+                return -EINVAL;
+        }
+
+        ret = drm_atomic_helper_check_planes(dev, state);
+        if (ret)
+                return ret;
+
+        return ret;
+}
+
+
+/**
+ * intel_atomic_commit - commit validated state object
+ * @dev: DRM device
+ * @state: the top-level driver state object
+ * @async: asynchronous commit
+ *
+ * This function commits a top-level state object that has been validated
+ * with drm_atomic_helper_check().
+ *
+ * FIXME:  Atomic modeset support for i915 is not yet complete.  At the moment
+ * we can only handle plane-related operations and do not yet support
+ * asynchronous commit.
+ *
+ * RETURNS
+ * Zero for success or -errno.
+ */
+int intel_atomic_commit(struct drm_device *dev,
+                        struct drm_atomic_state *state,
+                        bool async)
+{
+        int ret;
+        int i;
+
+        if (async) {
+                DRM_DEBUG_KMS("i915 does not yet support async commit\n");
+                return -EINVAL;
+        }
+
+        ret = drm_atomic_helper_prepare_planes(dev, state);
+        if (ret)
+                return ret;
+
+        /* Point of no return */
+
+        /*
+         * FIXME:  The proper sequence here will eventually be:
+         *
+         * drm_atomic_helper_swap_state(dev, state)
+         * drm_atomic_helper_commit_pre_planes(dev, state);
+         * drm_atomic_helper_commit_planes(dev, state);
+         * drm_atomic_helper_commit_post_planes(dev, state);
+         * drm_atomic_helper_wait_for_vblanks(dev, state);
+         * drm_atomic_helper_cleanup_planes(dev, state);
+         * drm_atomic_state_free(state);
+         *
+         * once we have full atomic modeset.  For now, just manually update
+         * plane states to avoid clobbering good states with dummy states
+         * while nuclear pageflipping.
+         */
+        for (i = 0; i < dev->mode_config.num_total_plane; i++) {
+                struct drm_plane *plane = state->planes[i];
+
+                if (!plane)
+                        continue;
+
+                plane->state->state = state;
+                swap(state->plane_states[i], plane->state);
+                plane->state->state = NULL;
+        }
+        drm_atomic_helper_commit_planes(dev, state);
+        drm_atomic_helper_wait_for_vblanks(dev, state);
+        drm_atomic_helper_cleanup_planes(dev, state);
+        drm_atomic_state_free(state);
+
+        return 0;
+}