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OMAPDSS: APPLY: add wait_pending_extra_info_updates()

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Add wait_pending_extra_info_updates() function which can be used to wait
until any extra_info changes have been taken into use by the hardware.
This can be only called when holding the apply mutex, so that other
threads cannot insert new extra_info changes.

This will be used to handle fifo-configurations.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
This commit is contained in:
Tomi Valkeinen 2011-11-16 14:37:48 +02:00
parent e4f7ad702e
commit f1577ce180
1 changed files with 70 additions and 0 deletions
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70
drivers/video/omap2/dss/apply.c
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@ -106,6 +106,7 @@ static struct {
static spinlock_t data_lock;
/* lock for blocking functions */
static DEFINE_MUTEX(apply_lock);
static DECLARE_COMPLETION(extra_updated_completion);
static void dss_register_vsync_isr(void);
@ -232,6 +233,70 @@ static bool need_go(struct omap_overlay_manager *mgr)
return false;
}
/* returns true if an extra_info field is currently being updated */
static bool extra_info_update_ongoing(void)
{
const int num_ovls = omap_dss_get_num_overlays();
struct ovl_priv_data *op;
struct omap_overlay *ovl;
struct mgr_priv_data *mp;
int i;
bool eid;
for (i = 0; i < num_ovls; ++i) {
ovl = omap_dss_get_overlay(i);
op = get_ovl_priv(ovl);
if (!op->enabled)
continue;
mp = get_mgr_priv(ovl->manager);
if (!mp->enabled)
continue;
eid = op->extra_info_dirty || op->shadow_extra_info_dirty;
if (!eid)
continue;
if (ovl_manual_update(ovl) && !mp->updating)
continue;
return true;
}
return false;
}
/* wait until no extra_info updates are pending */
static void wait_pending_extra_info_updates(void)
{
bool updating;
unsigned long flags;
unsigned long t;
spin_lock_irqsave(&data_lock, flags);
updating = extra_info_update_ongoing();
if (!updating) {
spin_unlock_irqrestore(&data_lock, flags);
return;
}
init_completion(&extra_updated_completion);
spin_unlock_irqrestore(&data_lock, flags);
t = msecs_to_jiffies(500);
wait_for_completion_timeout(&extra_updated_completion, t);
updating = extra_info_update_ongoing();
WARN_ON(updating);
}
int dss_mgr_wait_for_go(struct omap_overlay_manager *mgr)
{
unsigned long timeout = msecs_to_jiffies(500);
@ -553,6 +618,7 @@ static void dss_apply_irq_handler(void *data, u32 mask)
{
const int num_mgrs = dss_feat_get_num_mgrs();
int i;
bool extra_updating;
spin_lock(&data_lock);
@ -582,6 +648,10 @@ static void dss_apply_irq_handler(void *data, u32 mask)
dss_write_regs();
extra_updating = extra_info_update_ongoing();
if (!extra_updating)
complete_all(&extra_updated_completion);
if (!need_isr())
dss_unregister_vsync_isr();