Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 311 insertions, 0 deletions

diff --git a/drivers/gpu/drm/msm/msm_atomic.c b/drivers/gpu/drm/msm/msm_atomic.c
new file mode 100644
index 0000000000..9c45d641b5
--- /dev/null
+++ b/drivers/gpu/drm/msm/msm_atomic.c
@@ -0,0 +1,311 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2014 Red Hat
+ * Author: Rob Clark <robdclark@gmail.com>
+ */
+
+#include <drm/drm_atomic_uapi.h>
+#include <drm/drm_vblank.h>
+
+#include "msm_atomic_trace.h"
+#include "msm_drv.h"
+#include "msm_gem.h"
+#include "msm_kms.h"
+
+/*
+ * Helpers to control vblanks while we flush.. basically just to ensure
+ * that vblank accounting is switched on, so we get valid seqn/timestamp
+ * on pageflip events (if requested)
+ */
+
+static void vblank_get(struct msm_kms *kms, unsigned crtc_mask)
+{
+	struct drm_crtc *crtc;
+
+	for_each_crtc_mask(kms->dev, crtc, crtc_mask) {
+		if (!crtc->state->active)
+			continue;
+		drm_crtc_vblank_get(crtc);
+	}
+}
+
+static void vblank_put(struct msm_kms *kms, unsigned crtc_mask)
+{
+	struct drm_crtc *crtc;
+
+	for_each_crtc_mask(kms->dev, crtc, crtc_mask) {
+		if (!crtc->state->active)
+			continue;
+		drm_crtc_vblank_put(crtc);
+	}
+}
+
+static void lock_crtcs(struct msm_kms *kms, unsigned int crtc_mask)
+{
+	int crtc_index;
+	struct drm_crtc *crtc;
+
+	for_each_crtc_mask(kms->dev, crtc, crtc_mask) {
+		crtc_index = drm_crtc_index(crtc);
+		mutex_lock_nested(&kms->commit_lock[crtc_index], crtc_index);
+	}
+}
+
+static void unlock_crtcs(struct msm_kms *kms, unsigned int crtc_mask)
+{
+	struct drm_crtc *crtc;
+
+	for_each_crtc_mask_reverse(kms->dev, crtc, crtc_mask)
+		mutex_unlock(&kms->commit_lock[drm_crtc_index(crtc)]);
+}
+
+static void msm_atomic_async_commit(struct msm_kms *kms, int crtc_idx)
+{
+	unsigned crtc_mask = BIT(crtc_idx);
+
+	trace_msm_atomic_async_commit_start(crtc_mask);
+
+	lock_crtcs(kms, crtc_mask);
+
+	if (!(kms->pending_crtc_mask & crtc_mask)) {
+		unlock_crtcs(kms, crtc_mask);
+		goto out;
+	}
+
+	kms->pending_crtc_mask &= ~crtc_mask;
+
+	kms->funcs->enable_commit(kms);
+
+	vblank_get(kms, crtc_mask);
+
+	/*
+	 * Flush hardware updates:
+	 */
+	trace_msm_atomic_flush_commit(crtc_mask);
+	kms->funcs->flush_commit(kms, crtc_mask);
+
+	/*
+	 * Wait for flush to complete:
+	 */
+	trace_msm_atomic_wait_flush_start(crtc_mask);
+	kms->funcs->wait_flush(kms, crtc_mask);
+	trace_msm_atomic_wait_flush_finish(crtc_mask);
+
+	vblank_put(kms, crtc_mask);
+
+	kms->funcs->complete_commit(kms, crtc_mask);
+	unlock_crtcs(kms, crtc_mask);
+	kms->funcs->disable_commit(kms);
+
+out:
+	trace_msm_atomic_async_commit_finish(crtc_mask);
+}
+
+static void msm_atomic_pending_work(struct kthread_work *work)
+{
+	struct msm_pending_timer *timer = container_of(work,
+			struct msm_pending_timer, work.work);
+
+	msm_atomic_async_commit(timer->kms, timer->crtc_idx);
+}
+
+int msm_atomic_init_pending_timer(struct msm_pending_timer *timer,
+		struct msm_kms *kms, int crtc_idx)
+{
+	timer->kms = kms;
+	timer->crtc_idx = crtc_idx;
+
+	timer->worker = kthread_create_worker(0, "atomic-worker-%d", crtc_idx);
+	if (IS_ERR(timer->worker)) {
+		int ret = PTR_ERR(timer->worker);
+		timer->worker = NULL;
+		return ret;
+	}
+	sched_set_fifo(timer->worker->task);
+
+	msm_hrtimer_work_init(&timer->work, timer->worker,
+			      msm_atomic_pending_work,
+			      CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
+
+	return 0;
+}
+
+void msm_atomic_destroy_pending_timer(struct msm_pending_timer *timer)
+{
+	if (timer->worker)
+		kthread_destroy_worker(timer->worker);
+}
+
+static bool can_do_async(struct drm_atomic_state *state,
+		struct drm_crtc **async_crtc)
+{
+	struct drm_connector_state *connector_state;
+	struct drm_connector *connector;
+	struct drm_crtc_state *crtc_state;
+	struct drm_crtc *crtc;
+	int i, num_crtcs = 0;
+
+	if (!(state->legacy_cursor_update || state->async_update))
+		return false;
+
+	/* any connector change, means slow path: */
+	for_each_new_connector_in_state(state, connector, connector_state, i)
+		return false;
+
+	for_each_new_crtc_in_state(state, crtc, crtc_state, i) {
+		if (drm_atomic_crtc_needs_modeset(crtc_state))
+			return false;
+		if (!crtc_state->active)
+			return false;
+		if (++num_crtcs > 1)
+			return false;
+		*async_crtc = crtc;
+	}
+
+	return true;
+}
+
+/* Get bitmask of crtcs that will need to be flushed.  The bitmask
+ * can be used with for_each_crtc_mask() iterator, to iterate
+ * effected crtcs without needing to preserve the atomic state.
+ */
+static unsigned get_crtc_mask(struct drm_atomic_state *state)
+{
+	struct drm_crtc_state *crtc_state;
+	struct drm_crtc *crtc;
+	unsigned i, mask = 0;
+
+	for_each_new_crtc_in_state(state, crtc, crtc_state, i)
+		mask |= drm_crtc_mask(crtc);
+
+	return mask;
+}
+
+int msm_atomic_check(struct drm_device *dev, struct drm_atomic_state *state)
+{
+	struct drm_crtc_state *old_crtc_state, *new_crtc_state;
+	struct drm_crtc *crtc;
+	int i;
+
+	for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state,
+				      new_crtc_state, i) {
+		if ((old_crtc_state->ctm && !new_crtc_state->ctm) ||
+		    (!old_crtc_state->ctm && new_crtc_state->ctm)) {
+			new_crtc_state->mode_changed = true;
+			state->allow_modeset = true;
+		}
+	}
+
+	return drm_atomic_helper_check(dev, state);
+}
+
+void msm_atomic_commit_tail(struct drm_atomic_state *state)
+{
+	struct drm_device *dev = state->dev;
+	struct msm_drm_private *priv = dev->dev_private;
+	struct msm_kms *kms = priv->kms;
+	struct drm_crtc *async_crtc = NULL;
+	unsigned crtc_mask = get_crtc_mask(state);
+	bool async = can_do_async(state, &async_crtc);
+
+	trace_msm_atomic_commit_tail_start(async, crtc_mask);
+
+	kms->funcs->enable_commit(kms);
+
+	/*
+	 * Ensure any previous (potentially async) commit has
+	 * completed:
+	 */
+	lock_crtcs(kms, crtc_mask);
+	trace_msm_atomic_wait_flush_start(crtc_mask);
+	kms->funcs->wait_flush(kms, crtc_mask);
+	trace_msm_atomic_wait_flush_finish(crtc_mask);
+
+	/*
+	 * Now that there is no in-progress flush, prepare the
+	 * current update:
+	 */
+	if (kms->funcs->prepare_commit)
+		kms->funcs->prepare_commit(kms, state);
+
+	/*
+	 * Push atomic updates down to hardware:
+	 */
+	drm_atomic_helper_commit_modeset_disables(dev, state);
+	drm_atomic_helper_commit_planes(dev, state, 0);
+	drm_atomic_helper_commit_modeset_enables(dev, state);
+
+	if (async) {
+		struct msm_pending_timer *timer =
+			&kms->pending_timers[drm_crtc_index(async_crtc)];
+
+		/* async updates are limited to single-crtc updates: */
+		WARN_ON(crtc_mask != drm_crtc_mask(async_crtc));
+
+		/*
+		 * Start timer if we don't already have an update pending
+		 * on this crtc:
+		 */
+		if (!(kms->pending_crtc_mask & crtc_mask)) {
+			ktime_t vsync_time, wakeup_time;
+
+			kms->pending_crtc_mask |= crtc_mask;
+
+			if (drm_crtc_next_vblank_start(async_crtc, &vsync_time))
+				goto fallback;
+
+			wakeup_time = ktime_sub(vsync_time, ms_to_ktime(1));
+
+			msm_hrtimer_queue_work(&timer->work, wakeup_time,
+					HRTIMER_MODE_ABS);
+		}
+
+		kms->funcs->disable_commit(kms);
+		unlock_crtcs(kms, crtc_mask);
+		/*
+		 * At this point, from drm core's perspective, we
+		 * are done with the atomic update, so we can just
+		 * go ahead and signal that it is done:
+		 */
+		drm_atomic_helper_commit_hw_done(state);
+		drm_atomic_helper_cleanup_planes(dev, state);
+
+		trace_msm_atomic_commit_tail_finish(async, crtc_mask);
+
+		return;
+	}
+
+fallback:
+	/*
+	 * If there is any async flush pending on updated crtcs, fold
+	 * them into the current flush.
+	 */
+	kms->pending_crtc_mask &= ~crtc_mask;
+
+	vblank_get(kms, crtc_mask);
+
+	/*
+	 * Flush hardware updates:
+	 */
+	trace_msm_atomic_flush_commit(crtc_mask);
+	kms->funcs->flush_commit(kms, crtc_mask);
+	unlock_crtcs(kms, crtc_mask);
+	/*
+	 * Wait for flush to complete:
+	 */
+	trace_msm_atomic_wait_flush_start(crtc_mask);
+	kms->funcs->wait_flush(kms, crtc_mask);
+	trace_msm_atomic_wait_flush_finish(crtc_mask);
+
+	vblank_put(kms, crtc_mask);
+
+	lock_crtcs(kms, crtc_mask);
+	kms->funcs->complete_commit(kms, crtc_mask);
+	unlock_crtcs(kms, crtc_mask);
+	kms->funcs->disable_commit(kms);
+
+	drm_atomic_helper_commit_hw_done(state);
+	drm_atomic_helper_cleanup_planes(dev, state);
+
+	trace_msm_atomic_commit_tail_finish(async, crtc_mask);
+}