OMAPDSS: APPLY: rewrite overlay enable/disable

Overlays are currently enabled and disabled with a boolean in the struct
omap_overlay_info. The overlay info is set with ovl->set_overlay_info(),
and made into use with mgr->apply().

This doesn't work properly, as the enable/disable status may affect also
other overlays, for example when using fifo-merge. Thus the enabling and
disabling of the overlay needs to be done outside the normal overlay
configuration.

This patch achieves that by doing the following things:

1) Add function pointers to struct omap_overlay: enable(), disable() and
is_enabled(). These are used to do the obvious. The functions may block.

2) Move the "enabled" field from struct omap_overlay to ovl_priv_data.

3) Add a new route for settings to be applied to the HW, called
"extra_info". The status of the normal info and extra_info are tracked
separately.

The point here is to allow the normal info to be changed and
applied in non-blocking matter, whereas the extra_info can only be
changed when holding the mutex. This makes it possible to, for example,
set the overlay enable flag, apply it, and wait until the HW has taken
the flag into use.

This is not possible if the enable flag would be in the normal info, as
a new value for the flag could be set at any time from the users of
omapdss.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

1 files changed, 135 insertions, 28 deletions

diff --git a/drivers/video/omap2/dss/apply.c b/drivers/video/omap2/dss/apply.c
index 107a4ae..eb28a7f 100644
--- a/drivers/video/omap2/dss/apply.c
+++ b/drivers/video/omap2/dss/apply.c
@@ -63,14 +63,18 @@ struct ovl_priv_data {
 	 * VSYNC/EVSYNC */
 	bool shadow_dirty;
 
-	bool enabled;
-
 	struct omap_overlay_info info;
 
 	enum omap_channel channel;
 
 	u32 fifo_low;
 	u32 fifo_high;
+
+	bool extra_info_dirty;
+	bool shadow_extra_info_dirty;
+
+	bool enabled;
+
 };
 
 struct mgr_priv_data {
@@ -132,11 +136,6 @@ static bool mgr_manual_update(struct omap_overlay_manager *mgr)
 	return mgr->device->caps & OMAP_DSS_DISPLAY_CAP_MANUAL_UPDATE;
 }
 
-static int overlay_enabled(struct omap_overlay *ovl)
-{
-	return ovl->info.enabled && ovl->manager && ovl->manager->device;
-}
-
 int dss_mgr_wait_for_go(struct omap_overlay_manager *mgr)
 {
 	unsigned long timeout = msecs_to_jiffies(500);
@@ -270,10 +269,8 @@ static int dss_ovl_write_regs(struct omap_overlay *ovl)
 	op = get_ovl_priv(ovl);
 	oi = &op->info;
 
-	if (!op->enabled) {
-		dispc_ovl_enable(ovl->id, 0);
+	if (!op->enabled)
 		return 0;
-	}
 
 	replication = dss_use_replication(ovl->manager->device, oi->color_mode);
 
@@ -291,11 +288,21 @@ static int dss_ovl_write_regs(struct omap_overlay *ovl)
 
 	dispc_ovl_set_fifo_threshold(ovl->id, op->fifo_low, op->fifo_high);
 
-	dispc_ovl_enable(ovl->id, 1);
-
 	return 0;
 }
 
+static void dss_ovl_write_regs_extra(struct omap_overlay *ovl)
+{
+	struct ovl_priv_data *op = get_ovl_priv(ovl);
+
+	DSSDBGF("%d", ovl->id);
+
+	/* note: write also when op->enabled == false, so that the ovl gets
+	 * disabled */
+
+	dispc_ovl_enable(ovl->id, op->enabled);
+}
+
 static void dss_mgr_write_regs(struct omap_overlay_manager *mgr)
 {
 	struct mgr_priv_data *mp;
@@ -356,6 +363,30 @@ static int dss_write_regs(void)
 		mgr_go[op->channel] = true;
 	}
 
+	for (i = 0; i < num_ovls; ++i) {
+		ovl = omap_dss_get_overlay(i);
+		op = get_ovl_priv(ovl);
+
+		if (!op->extra_info_dirty)
+			continue;
+
+		mp = get_mgr_priv(ovl->manager);
+
+		if (mp->manual_update && !mp->do_manual_update)
+			continue;
+
+		if (mp->busy) {
+			busy = true;
+			continue;
+		}
+
+		dss_ovl_write_regs_extra(ovl);
+
+		op->extra_info_dirty = false;
+		op->shadow_extra_info_dirty = true;
+		mgr_go[op->channel] = true;
+	}
+
 	/* Commit manager settings */
 	for (i = 0; i < num_mgrs; ++i) {
 		mgr = omap_dss_get_overlay_manager(i);
@@ -419,6 +450,7 @@ void dss_mgr_start_update(struct omap_overlay_manager *mgr)
 	list_for_each_entry(ovl, &mgr->overlays, list) {
 		op = get_ovl_priv(ovl);
 		op->shadow_dirty = false;
+		op->shadow_extra_info_dirty = false;
 	}
 
 	mp->shadow_dirty = false;
@@ -490,8 +522,10 @@ static void dss_apply_irq_handler(void *data, u32 mask)
 
 		mp = get_mgr_priv(ovl->manager);
 
-		if (!mp->busy)
+		if (!mp->busy) {
 			op->shadow_dirty = false;
+			op->shadow_extra_info_dirty = false;
+		}
 	}
 
 	for (i = 0; i < num_mgrs; ++i) {
@@ -541,14 +575,6 @@ static void omap_dss_mgr_apply_ovl(struct omap_overlay *ovl)
 		ovl->info_dirty  = true;
 	}
 
-	if (!overlay_enabled(ovl)) {
-		if (op->enabled) {
-			op->enabled = false;
-			op->dirty = true;
-		}
-		return;
-	}
-
 	if (!ovl->info_dirty)
 		return;
 
@@ -557,8 +583,6 @@ static void omap_dss_mgr_apply_ovl(struct omap_overlay *ovl)
 	op->info = ovl->info;
 
 	op->channel = ovl->manager->id;
-
-	op->enabled = true;
 }
 
 static void omap_dss_mgr_apply_mgr(struct omap_overlay_manager *mgr)
@@ -593,9 +617,6 @@ static void omap_dss_mgr_apply_ovl_fifos(struct omap_overlay *ovl)
 
 	op = get_ovl_priv(ovl);
 
-	if (!op->enabled)
-		return;
-
 	dssdev = ovl->manager->device;
 
 	size = dispc_ovl_get_fifo_size(ovl->id);
@@ -828,6 +849,8 @@ void dss_ovl_get_info(struct omap_overlay *ovl,
 int dss_ovl_set_manager(struct omap_overlay *ovl,
 		struct omap_overlay_manager *mgr)
 {
+	struct ovl_priv_data *op = get_ovl_priv(ovl);
+	unsigned long flags;
 	int r;
 
 	if (!mgr)
@@ -842,7 +865,10 @@ int dss_ovl_set_manager(struct omap_overlay *ovl,
 		goto err;
 	}
 
-	if (ovl->info.enabled) {
+	spin_lock_irqsave(&data_lock, flags);
+
+	if (op->enabled) {
+		spin_unlock_irqrestore(&data_lock, flags);
 		DSSERR("overlay has to be disabled to change the manager\n");
 		r = -EINVAL;
 		goto err;
@@ -852,6 +878,8 @@ int dss_ovl_set_manager(struct omap_overlay *ovl,
 	list_add_tail(&ovl->list, &mgr->overlays);
 	ovl->manager_changed = true;
 
+	spin_unlock_irqrestore(&data_lock, flags);
+
 	/* XXX: When there is an overlay on a DSI manual update display, and
 	 * the overlay is first disabled, then moved to tv, and enabled, we
 	 * seem to get SYNC_LOST_DIGIT error.
@@ -875,6 +903,8 @@ err:
 
 int dss_ovl_unset_manager(struct omap_overlay *ovl)
 {
+	struct ovl_priv_data *op = get_ovl_priv(ovl);
+	unsigned long flags;
 	int r;
 
 	mutex_lock(&apply_lock);
@@ -885,7 +915,10 @@ int dss_ovl_unset_manager(struct omap_overlay *ovl)
 		goto err;
 	}
 
-	if (ovl->info.enabled) {
+	spin_lock_irqsave(&data_lock, flags);
+
+	if (op->enabled) {
+		spin_unlock_irqrestore(&data_lock, flags);
 		DSSERR("overlay has to be disabled to unset the manager\n");
 		r = -EINVAL;
 		goto err;
@@ -895,9 +928,83 @@ int dss_ovl_unset_manager(struct omap_overlay *ovl)
 	list_del(&ovl->list);
 	ovl->manager_changed = true;
 
+	spin_unlock_irqrestore(&data_lock, flags);
+
+	mutex_unlock(&apply_lock);
+
+	return 0;
+err:
+	mutex_unlock(&apply_lock);
+	return r;
+}
+
+bool dss_ovl_is_enabled(struct omap_overlay *ovl)
+{
+	struct ovl_priv_data *op = get_ovl_priv(ovl);
+	unsigned long flags;
+	bool e;
+
+	spin_lock_irqsave(&data_lock, flags);
+
+	e = op->enabled;
+
+	spin_unlock_irqrestore(&data_lock, flags);
+
+	return e;
+}
+
+int dss_ovl_enable(struct omap_overlay *ovl)
+{
+	struct ovl_priv_data *op = get_ovl_priv(ovl);
+	unsigned long flags;
+	int r;
+
+	mutex_lock(&apply_lock);
+
+	if (ovl->manager == NULL || ovl->manager->device == NULL) {
+		r = -EINVAL;
+		goto err;
+	}
+
+	spin_lock_irqsave(&data_lock, flags);
+
+	op->enabled = true;
+	op->extra_info_dirty = true;
+
+	spin_unlock_irqrestore(&data_lock, flags);
+
+	mutex_unlock(&apply_lock);
+
+	return 0;
+err:
+	mutex_unlock(&apply_lock);
+	return r;
+}
+
+int dss_ovl_disable(struct omap_overlay *ovl)
+{
+	struct ovl_priv_data *op = get_ovl_priv(ovl);
+	unsigned long flags;
+	int r;
+
+	mutex_lock(&apply_lock);
+
+	if (ovl->manager == NULL || ovl->manager->device == NULL) {
+		r = -EINVAL;
+		goto err;
+	}
+
+	spin_lock_irqsave(&data_lock, flags);
+
+	op->enabled = false;
+	op->extra_info_dirty = true;
+
+	spin_unlock_irqrestore(&data_lock, flags);
+
 	mutex_unlock(&apply_lock);
 
 	return 0;
+
 err:
 	mutex_unlock(&apply_lock);
 	return r;