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gpu: ipu-v3: Implement use counter for ipu_dc_enable(), ipu_dc_disable() 

The functions ipu_dc_enable() and ipu_dc_disable() enable/disable the DC
globally in the IPU_CONF register, but the DC is used by multiple clients
on different DC channels. So make sure to only disable/enable the DC
globally based on a use counter.

Signed-off-by: Steve Longerbeam <steve_longerbeam@mentor.com>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
This commit is contained in:
Steve Longerbeam 2013-08-26 11:42:09 -07:00 committed by Philipp Zabel
parent 6457b9716b
commit f853f3daac
1 changed files with 23 additions and 2 deletions
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25
drivers/gpu/ipu-v3/ipu-dc.c
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@ -114,6 +114,7 @@ struct ipu_dc_priv {
struct completion comp;
int dc_irq;
int dp_irq;
int use_count;
};
static void dc_link_event(struct ipu_dc *dc, int event, int addr, int priority)
@ -232,7 +233,16 @@ EXPORT_SYMBOL_GPL(ipu_dc_init_sync);
void ipu_dc_enable(struct ipu_soc *ipu)
{
ipu_module_enable(ipu, IPU_CONF_DC_EN);
struct ipu_dc_priv *priv = ipu->dc_priv;
mutex_lock(&priv->mutex);
if (!priv->use_count)
ipu_module_enable(priv->ipu, IPU_CONF_DC_EN);
priv->use_count++;
mutex_unlock(&priv->mutex);
}
EXPORT_SYMBOL_GPL(ipu_dc_enable);
@ -294,7 +304,18 @@ EXPORT_SYMBOL_GPL(ipu_dc_disable_channel);
void ipu_dc_disable(struct ipu_soc *ipu)
{
ipu_module_disable(ipu, IPU_CONF_DC_EN);
struct ipu_dc_priv *priv = ipu->dc_priv;
mutex_lock(&priv->mutex);
priv->use_count--;
if (!priv->use_count)
ipu_module_disable(priv->ipu, IPU_CONF_DC_EN);
if (priv->use_count < 0)
priv->use_count = 0;
mutex_unlock(&priv->mutex);
}
EXPORT_SYMBOL_GPL(ipu_dc_disable);