Commit f853f3da authored by Steve Longerbeam's avatar Steve Longerbeam Committed by Philipp Zabel
Browse files

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: default avatarSteve Longerbeam <steve_longerbeam@mentor.com>
Signed-off-by: default avatarPhilipp Zabel <p.zabel@pengutronix.de>
parent 6457b971

drivers/gpu/ipu-v3/ipu-dc.c

+23 −2
Original line number Diff line number Diff line
@@ -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);

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