[PATCH v3 07/12] gpu: ipu-v3: Fix IRT usage

[Steve Longerbeam]

There can be multiple IC tasks using the IRT, so the IRT needs
a separate use counter. Create a private ipu_irt_enable() to
enable the IRT module when any IC task requires rotation, and
ipu_irt_disable() when a task no longer needs the IRT.

Signed-off-by: Steve Longerbeam <steve_longerbeam at mentor.com>

---

v3: no changes
v2:
- cleaned up irt_use_count decrement in ipu_irt_disable()
---
 drivers/gpu/ipu-v3/ipu-ic.c | 40 +++++++++++++++++++++++++++++++---------
 1 file changed, 31 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/ipu-v3/ipu-ic.c b/drivers/gpu/ipu-v3/ipu-ic.c
index 1dcb96c..1a37afc 100644
--- a/drivers/gpu/ipu-v3/ipu-ic.c
+++ b/drivers/gpu/ipu-v3/ipu-ic.c
@@ -160,6 +160,7 @@ struct ipu_ic_priv {
        spinlock_t lock;
        struct ipu_soc *ipu;
        int use_count;
+       int irt_use_count;
        struct ipu_ic task[IC_NUM_TASKS];
 };

@@ -379,8 +380,6 @@ void ipu_ic_task_disable(struct ipu_ic *ic)

        ipu_ic_write(ic, ic_conf, IC_CONF);

-       ic->rotation = ic->graphics = false;
-
        spin_unlock_irqrestore(&priv->lock, flags);
 }
 EXPORT_SYMBOL_GPL(ipu_ic_task_disable);
@@ -629,22 +628,41 @@ unlock:
 }
 EXPORT_SYMBOL_GPL(ipu_ic_task_idma_init);

+static void ipu_irt_enable(struct ipu_ic *ic)
+{
+       struct ipu_ic_priv *priv = ic->priv;
+
+       if (!priv->irt_use_count)
+               ipu_module_enable(priv->ipu, IPU_CONF_ROT_EN);
+
+       priv->irt_use_count++;
+}
+
+static void ipu_irt_disable(struct ipu_ic *ic)
+{
+       struct ipu_ic_priv *priv = ic->priv;
+
+       if (priv->irt_use_count) {
+               if (!--priv->irt_use_count)
+                       ipu_module_disable(priv->ipu, IPU_CONF_ROT_EN);
+       }
+}
+
 int ipu_ic_enable(struct ipu_ic *ic)
 {
        struct ipu_ic_priv *priv = ic->priv;
        unsigned long flags;
-       u32 module = IPU_CONF_IC_EN;

        spin_lock_irqsave(&priv->lock, flags);

-       if (ic->rotation)
-               module |= IPU_CONF_ROT_EN;
-
        if (!priv->use_count)
-               ipu_module_enable(priv->ipu, module);
+               ipu_module_enable(priv->ipu, IPU_CONF_IC_EN);

        priv->use_count++;

+       if (ic->rotation)
+               ipu_irt_enable(ic);
+
        spin_unlock_irqrestore(&priv->lock, flags);

        return 0;
@@ -655,18 +673,22 @@ int ipu_ic_disable(struct ipu_ic *ic)
 {
        struct ipu_ic_priv *priv = ic->priv;
        unsigned long flags;
-       u32 module = IPU_CONF_IC_EN | IPU_CONF_ROT_EN;

        spin_lock_irqsave(&priv->lock, flags);

        priv->use_count--;

        if (!priv->use_count)
-               ipu_module_disable(priv->ipu, module);
+               ipu_module_disable(priv->ipu, IPU_CONF_IC_EN);

        if (priv->use_count < 0)
                priv->use_count = 0;

+       if (ic->rotation)
+               ipu_irt_disable(ic);
+
+       ic->rotation = ic->graphics = false;
+
        spin_unlock_irqrestore(&priv->lock, flags);

        return 0;
-- 
1.9.1