drm: sti: convert driver to atomic modeset

v1: This patch does the minimum to make sti driver use atomic helpers.
No big bang, only adapt some functions to new call order.

v2: Use dpms and page flip atomic helpers

Signed-off-by: Benjamin Gaignard <[e-mail]>

drivers/gpu/drm/sti/sti_drm_crtc.c

···
 #include <linux/clk.h>
 
 #include <drm/drmP.h>
+#include <drm/drm_atomic.h>
+#include <drm/drm_atomic_helper.h>
 #include <drm/drm_crtc_helper.h>
 #include <drm/drm_plane_helper.h>
 
···
 }
 
 static int
-sti_drm_crtc_mode_set(struct drm_crtc *crtc, struct drm_display_mode *mode,
-		      struct drm_display_mode *adjusted_mode, int x, int y,
-		      struct drm_framebuffer *old_fb)
+sti_drm_crtc_mode_set(struct drm_crtc *crtc, struct drm_display_mode *mode)
 {
 	struct sti_mixer *mixer = to_sti_mixer(crtc);
 	struct device *dev = mixer->dev;
 	struct sti_compositor *compo = dev_get_drvdata(dev);
-	struct sti_layer *layer;
 	struct clk *clk;
 	int rate = mode->clock * 1000;
 	int res;
-	unsigned int w, h;
 
-	DRM_DEBUG_KMS("CRTC:%d (%s) fb:%d mode:%d (%s)\n",
+	DRM_DEBUG_KMS("CRTC:%d (%s) mode:%d (%s)\n",
 		      crtc->base.id, sti_mixer_to_str(mixer),
-		      crtc->primary->fb->base.id, mode->base.id, mode->name);
+		      mode->base.id, mode->name);
 
 	DRM_DEBUG_KMS("%d %d %d %d %d %d %d %d %d %d 0x%x 0x%x\n",
 		      mode->vrefresh, mode->clock,
···
 	sti_vtg_set_config(mixer->id == STI_MIXER_MAIN ?
 			compo->vtg_main : compo->vtg_aux, &crtc->mode);
 
-	/* a GDP is reserved to the CRTC FB */
-	layer = to_sti_layer(crtc->primary);
-	if (!layer) {
-		DRM_ERROR("Can not find GDP0)\n");
-		return -EINVAL;
-	}
-
-	/* copy the mode data adjusted by mode_fixup() into crtc->mode
-	 * so that hardware can be set to proper mode
-	 */
-	memcpy(&crtc->mode, adjusted_mode, sizeof(*adjusted_mode));
-
-	res = sti_mixer_set_layer_depth(mixer, layer);
-	if (res) {
-		DRM_ERROR("Can not set layer depth\n");
-		return -EINVAL;
-	}
 	res = sti_mixer_active_video_area(mixer, &crtc->mode);
 	if (res) {
 		DRM_ERROR("Can not set active video area\n");
 		return -EINVAL;
 	}
 
-	w = crtc->primary->fb->width - x;
-	h = crtc->primary->fb->height - y;
-
-	return sti_layer_prepare(layer, crtc,
-			crtc->primary->fb, &crtc->mode,
-			mixer->id, 0, 0, w, h, x, y, w, h);
-}
-
-static int sti_drm_crtc_mode_set_base(struct drm_crtc *crtc, int x, int y,
-				      struct drm_framebuffer *old_fb)
-{
-	struct sti_mixer *mixer = to_sti_mixer(crtc);
-	struct sti_layer *layer;
-	unsigned int w, h;
-	int ret;
-
-	DRM_DEBUG_KMS("CRTC:%d (%s) fb:%d (%d,%d)\n",
-		      crtc->base.id, sti_mixer_to_str(mixer),
-		      crtc->primary->fb->base.id, x, y);
-
-	/* GDP is reserved to the CRTC FB */
-	layer = to_sti_layer(crtc->primary);
-	if (!layer) {
-		DRM_ERROR("Can not find GDP0)\n");
-		ret = -EINVAL;
-		goto out;
-	}
-
-	w = crtc->primary->fb->width - crtc->x;
-	h = crtc->primary->fb->height - crtc->y;
-
-	ret = sti_layer_prepare(layer, crtc,
-				crtc->primary->fb, &crtc->mode,
-				mixer->id, 0, 0, w, h,
-				crtc->x, crtc->y, w, h);
-	if (ret) {
-		DRM_ERROR("Can not prepare layer\n");
-		goto out;
-	}
-
-	sti_drm_crtc_commit(crtc);
-out:
-	return ret;
+	return res;
 }
 
 static void sti_drm_crtc_disable(struct drm_crtc *crtc)
···
 	struct sti_mixer *mixer = to_sti_mixer(crtc);
 	struct device *dev = mixer->dev;
 	struct sti_compositor *compo = dev_get_drvdata(dev);
-	struct sti_layer *layer;
 
 	if (!mixer->enabled)
 		return;
···
 
 	/* Disable Background */
 	sti_mixer_set_background_status(mixer, false);
-
-	/* Disable GDP */
-	layer = to_sti_layer(crtc->primary);
-	if (!layer) {
-		DRM_ERROR("Cannot find GDP0\n");
-		return;
-	}
-
-	/* Disable layer at mixer level */
-	if (sti_mixer_set_layer_status(mixer, layer, false))
-		DRM_ERROR("Can not disable %s layer at mixer\n",
-				sti_layer_to_str(layer));
-
-	/* Wait a while to be sure that a Vsync event is received */
-	msleep(WAIT_NEXT_VSYNC_MS);
-
-	/* Then disable layer itself */
-	sti_layer_disable(layer);
 
 	drm_crtc_vblank_off(crtc);
 
···
 	mixer->enabled = false;
 }
 
+static void
+sti_drm_crtc_mode_set_nofb(struct drm_crtc *crtc)
+{
+	sti_drm_crtc_prepare(crtc);
+	sti_drm_crtc_mode_set(crtc, &crtc->state->adjusted_mode);
+}
+
+static void sti_drm_atomic_begin(struct drm_crtc *crtc)
+{
+	struct sti_mixer *mixer = to_sti_mixer(crtc);
+
+	if (crtc->state->event) {
+		crtc->state->event->pipe = drm_crtc_index(crtc);
+
+		WARN_ON(drm_crtc_vblank_get(crtc) != 0);
+
+		mixer->pending_event = crtc->state->event;
+		crtc->state->event = NULL;
+	}
+}
+
+static void sti_drm_atomic_flush(struct drm_crtc *crtc)
+{
+}
+
 static struct drm_crtc_helper_funcs sti_crtc_helper_funcs = {
 	.dpms = sti_drm_crtc_dpms,
 	.prepare = sti_drm_crtc_prepare,
 	.commit = sti_drm_crtc_commit,
 	.mode_fixup = sti_drm_crtc_mode_fixup,
-	.mode_set = sti_drm_crtc_mode_set,
-	.mode_set_base = sti_drm_crtc_mode_set_base,
+	.mode_set = drm_helper_crtc_mode_set,
+	.mode_set_nofb = sti_drm_crtc_mode_set_nofb,
+	.mode_set_base = drm_helper_crtc_mode_set_base,
 	.disable = sti_drm_crtc_disable,
+	.atomic_begin = sti_drm_atomic_begin,
+	.atomic_flush = sti_drm_atomic_flush,
 };
-
-static int sti_drm_crtc_page_flip(struct drm_crtc *crtc,
-				  struct drm_framebuffer *fb,
-				  struct drm_pending_vblank_event *event,
-				  uint32_t page_flip_flags)
-{
-	struct drm_device *drm_dev = crtc->dev;
-	struct drm_framebuffer *old_fb;
-	struct sti_mixer *mixer = to_sti_mixer(crtc);
-	unsigned long flags;
-	int ret;
-
-	DRM_DEBUG_KMS("fb %d --> fb %d\n",
-			crtc->primary->fb->base.id, fb->base.id);
-
-	mutex_lock(&drm_dev->struct_mutex);
-
-	old_fb = crtc->primary->fb;
-	crtc->primary->fb = fb;
-	ret = sti_drm_crtc_mode_set_base(crtc, crtc->x, crtc->y, old_fb);
-	if (ret) {
-		DRM_ERROR("failed\n");
-		crtc->primary->fb = old_fb;
-		goto out;
-	}
-
-	if (event) {
-		event->pipe = mixer->id;
-
-		ret = drm_vblank_get(drm_dev, event->pipe);
-		if (ret) {
-			DRM_ERROR("Cannot get vblank\n");
-			goto out;
-		}
-
-		spin_lock_irqsave(&drm_dev->event_lock, flags);
-		if (mixer->pending_event) {
-			drm_vblank_put(drm_dev, event->pipe);
-			ret = -EBUSY;
-		} else {
-			mixer->pending_event = event;
-		}
-		spin_unlock_irqrestore(&drm_dev->event_lock, flags);
-	}
-out:
-	mutex_unlock(&drm_dev->struct_mutex);
-	return ret;
-}
 
 static void sti_drm_crtc_destroy(struct drm_crtc *crtc)
 {
···
 EXPORT_SYMBOL(sti_drm_crtc_disable_vblank);
 
 static struct drm_crtc_funcs sti_crtc_funcs = {
-	.set_config = drm_crtc_helper_set_config,
-	.page_flip = sti_drm_crtc_page_flip,
+	.set_config = drm_atomic_helper_set_config,
+	.page_flip = drm_atomic_helper_page_flip,
 	.destroy = sti_drm_crtc_destroy,
 	.set_property = sti_drm_crtc_set_property,
+	.reset = drm_atomic_helper_crtc_reset,
+	.atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
 };
 
 bool sti_drm_crtc_is_main(struct drm_crtc *crtc)

drivers/gpu/drm/sti/sti_drm_drv.c

···
 #include <linux/module.h>
 #include <linux/of_platform.h>
 
+#include <drm/drm_atomic.h>
+#include <drm/drm_atomic_helper.h>
 #include <drm/drm_crtc_helper.h>
 #include <drm/drm_gem_cma_helper.h>
 #include <drm/drm_fb_cma_helper.h>
···
 #define STI_MAX_FB_HEIGHT	4096
 #define STI_MAX_FB_WIDTH	4096
 
+static void sti_drm_atomic_schedule(struct sti_drm_private *private,
+				  struct drm_atomic_state *state)
+{
+	private->commit.state = state;
+	schedule_work(&private->commit.work);
+}
+
+static void sti_drm_atomic_complete(struct sti_drm_private *private,
+				  struct drm_atomic_state *state)
+{
+	struct drm_device *drm = private->drm_dev;
+
+	/*
+	 * Everything below can be run asynchronously without the need to grab
+	 * any modeset locks at all under one condition: It must be guaranteed
+	 * that the asynchronous work has either been cancelled (if the driver
+	 * supports it, which at least requires that the framebuffers get
+	 * cleaned up with drm_atomic_helper_cleanup_planes()) or completed
+	 * before the new state gets committed on the software side with
+	 * drm_atomic_helper_swap_state().
+	 *
+	 * This scheme allows new atomic state updates to be prepared and
+	 * checked in parallel to the asynchronous completion of the previous
+	 * update. Which is important since compositors need to figure out the
+	 * composition of the next frame right after having submitted the
+	 * current layout.
+	 */
+
+	drm_atomic_helper_commit_modeset_disables(drm, state);
+	drm_atomic_helper_commit_planes(drm, state);
+	drm_atomic_helper_commit_modeset_enables(drm, state);
+
+	drm_atomic_helper_wait_for_vblanks(drm, state);
+
+	drm_atomic_helper_cleanup_planes(drm, state);
+	drm_atomic_state_free(state);
+}
+
+static void sti_drm_atomic_work(struct work_struct *work)
+{
+	struct sti_drm_private *private = container_of(work,
+			struct sti_drm_private, commit.work);
+
+	sti_drm_atomic_complete(private, private->commit.state);
+}
+
+static int sti_drm_atomic_commit(struct drm_device *drm,
+			       struct drm_atomic_state *state, bool async)
+{
+	struct sti_drm_private *private = drm->dev_private;
+	int err;
+
+	err = drm_atomic_helper_prepare_planes(drm, state);
+	if (err)
+		return err;
+
+	/* serialize outstanding asynchronous commits */
+	mutex_lock(&private->commit.lock);
+	flush_work(&private->commit.work);
+
+	/*
+	 * This is the point of no return - everything below never fails except
+	 * when the hw goes bonghits. Which means we can commit the new state on
+	 * the software side now.
+	 */
+
+	drm_atomic_helper_swap_state(drm, state);
+
+	if (async)
+		sti_drm_atomic_schedule(private, state);
+	else
+		sti_drm_atomic_complete(private, state);
+
+	mutex_unlock(&private->commit.lock);
+	return 0;
+}
+
 static struct drm_mode_config_funcs sti_drm_mode_config_funcs = {
 	.fb_create = drm_fb_cma_create,
+	.atomic_check = drm_atomic_helper_check,
+	.atomic_commit = sti_drm_atomic_commit,
 };
 
 static void sti_drm_mode_config_init(struct drm_device *dev)
···
 	dev->dev_private = (void *)private;
 	private->drm_dev = dev;
 
+	mutex_init(&private->commit.lock);
+	INIT_WORK(&private->commit.work, sti_drm_atomic_work);
+
 	drm_mode_config_init(dev);
 	drm_kms_helper_poll_init(dev);
 
···
 		return ret;
 	}
 
-	drm_helper_disable_unused_functions(dev);
+	drm_mode_config_reset(dev);
 
 #ifdef CONFIG_DRM_STI_FBDEV
 	drm_fbdev_cma_init(dev, 32,

drivers/gpu/drm/sti/sti_drm_drv.h

···
 	struct sti_compositor *compo;
 	struct drm_property *plane_zorder_property;
 	struct drm_device *drm_dev;
+
+	struct {
+		struct drm_atomic_state *state;
+		struct work_struct work;
+		struct mutex lock;
+	} commit;
 };
 
 #endif

drivers/gpu/drm/sti/sti_drm_plane.c

···
  * License terms:  GNU General Public License (GPL), version 2
  */
 
+#include <drm/drmP.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_plane_helper.h>
+
 #include "sti_compositor.h"
 #include "sti_drm_drv.h"
 #include "sti_drm_plane.h"
···
 	struct sti_mixer *mixer = to_sti_mixer(crtc);
 	int res;
 
-	DRM_DEBUG_KMS("CRTC:%d (%s) drm plane:%d (%s) drm fb:%d\n",
+	DRM_DEBUG_KMS("CRTC:%d (%s) drm plane:%d (%s)\n",
 		      crtc->base.id, sti_mixer_to_str(mixer),
-		      plane->base.id, sti_layer_to_str(layer), fb->base.id);
+		      plane->base.id, sti_layer_to_str(layer));
 	DRM_DEBUG_KMS("(%dx%d)@(%d,%d)\n", crtc_w, crtc_h, crtc_x, crtc_y);
 
 	res = sti_mixer_set_layer_depth(mixer, layer);
···
 {
 	DRM_DEBUG_DRIVER("\n");
 
-	sti_drm_disable_plane(plane);
+	drm_plane_helper_disable(plane);
 	drm_plane_cleanup(plane);
 }
 
···
 }
 
 static struct drm_plane_funcs sti_drm_plane_funcs = {
-	.update_plane = sti_drm_update_plane,
-	.disable_plane = sti_drm_disable_plane,
+	.update_plane = drm_atomic_helper_update_plane,
+	.disable_plane = drm_atomic_helper_disable_plane,
 	.destroy = sti_drm_plane_destroy,
 	.set_property = sti_drm_plane_set_property,
+	.reset = drm_atomic_helper_plane_reset,
+	.atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_plane_destroy_state,
+};
+
+static int sti_drm_plane_prepare_fb(struct drm_plane *plane,
+				  struct drm_framebuffer *fb,
+				  const struct drm_plane_state *new_state)
+{
+	return 0;
+}
+
+static void sti_drm_plane_cleanup_fb(struct drm_plane *plane,
+				   struct drm_framebuffer *fb,
+				   const struct drm_plane_state *old_fb)
+{
+}
+
+static int sti_drm_plane_atomic_check(struct drm_plane *plane,
+				      struct drm_plane_state *state)
+{
+	return 0;
+}
+
+static void sti_drm_plane_atomic_update(struct drm_plane *plane,
+					struct drm_plane_state *oldstate)
+{
+	struct drm_plane_state *state = plane->state;
+
+	sti_drm_update_plane(plane, state->crtc, state->fb,
+			    state->crtc_x, state->crtc_y,
+			    state->crtc_w, state->crtc_h,
+			    state->src_x, state->src_y,
+			    state->src_w, state->src_h);
+}
+
+static void sti_drm_plane_atomic_disable(struct drm_plane *plane,
+					 struct drm_plane_state *oldstate)
+{
+	sti_drm_disable_plane(plane);
+}
+
+static const struct drm_plane_helper_funcs sti_drm_plane_helpers_funcs = {
+	.prepare_fb = sti_drm_plane_prepare_fb,
+	.cleanup_fb = sti_drm_plane_cleanup_fb,
+	.atomic_check = sti_drm_plane_atomic_check,
+	.atomic_update = sti_drm_plane_atomic_update,
+	.atomic_disable = sti_drm_plane_atomic_disable,
 };
 
 static void sti_drm_plane_attach_zorder_property(struct drm_plane *plane,
···
 		return NULL;
 	}
 
+	drm_plane_helper_add(&layer->plane, &sti_drm_plane_helpers_funcs);
+
 	for (i = 0; i < ARRAY_SIZE(sti_layer_default_zorder); i++)
 		if (sti_layer_default_zorder[i] == layer->desc)
 			break;
 
-	default_zorder = i;
+	default_zorder = i + 1;
 
 	if (type == DRM_PLANE_TYPE_OVERLAY)
 		sti_drm_plane_attach_zorder_property(&layer->plane,

drivers/gpu/drm/sti/sti_dvo.c

···
 #include <linux/platform_device.h>
 
 #include <drm/drmP.h>
+#include <drm/drm_atomic_helper.h>
 #include <drm/drm_crtc_helper.h>
 #include <drm/drm_panel.h>
 
···
 }
 
 static struct drm_connector_funcs sti_dvo_connector_funcs = {
-	.dpms = drm_helper_connector_dpms,
+	.dpms = drm_atomic_helper_connector_dpms,
 	.fill_modes = drm_helper_probe_single_connector_modes,
 	.detect = sti_dvo_connector_detect,
 	.destroy = sti_dvo_connector_destroy,
+	.reset = drm_atomic_helper_connector_reset,
+	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 };
 
 static struct drm_encoder *sti_dvo_find_encoder(struct drm_device *dev)

drivers/gpu/drm/sti/sti_hda.c

···
 #include <linux/platform_device.h>
 
 #include <drm/drmP.h>
+#include <drm/drm_atomic_helper.h>
 #include <drm/drm_crtc_helper.h>
 
 /* HDformatter registers */
···
 }
 
 static struct drm_connector_funcs sti_hda_connector_funcs = {
-	.dpms = drm_helper_connector_dpms,
+	.dpms = drm_atomic_helper_connector_dpms,
 	.fill_modes = drm_helper_probe_single_connector_modes,
 	.detect = sti_hda_connector_detect,
 	.destroy = sti_hda_connector_destroy,
+	.reset = drm_atomic_helper_connector_reset,
+	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 };
 
 static struct drm_encoder *sti_hda_find_encoder(struct drm_device *dev)

drivers/gpu/drm/sti/sti_hdmi.c

···
 #include <linux/reset.h>
 
 #include <drm/drmP.h>
+#include <drm/drm_atomic_helper.h>
 #include <drm/drm_crtc_helper.h>
 #include <drm/drm_edid.h>
 
···
 }
 
 static struct drm_connector_funcs sti_hdmi_connector_funcs = {
-	.dpms = drm_helper_connector_dpms,
+	.dpms = drm_atomic_helper_connector_dpms,
 	.fill_modes = drm_helper_probe_single_connector_modes,
 	.detect = sti_hdmi_connector_detect,
 	.destroy = sti_hdmi_connector_destroy,
+	.reset = drm_atomic_helper_connector_reset,
+	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 };
 
 static struct drm_encoder *sti_hdmi_find_encoder(struct drm_device *dev)