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gpu: ipu-v3: Add ipu_idmac_get_current_buffer function

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This function returns the currently active buffer (0 or 1)
of a double buffered IDMAC channel. It is to be used by the
CSI driver.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
This commit is contained in:
Philipp Zabel
2014-06-04 11:07:11 +02:00
parent 35de925ffa
commit e90460970f
2 changed files with 10 additions and 0 deletions
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drivers/gpu/ipu-v3/ipu-common.c
+9
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@@ -661,6 +661,15 @@ int ipu_module_disable(struct ipu_soc *ipu, u32 mask)
}
EXPORT_SYMBOL_GPL(ipu_module_disable);
int ipu_idmac_get_current_buffer(struct ipuv3_channel *channel)
{
struct ipu_soc *ipu = channel->ipu;
unsigned int chno = channel->num;
return (ipu_cm_read(ipu, IPU_CHA_CUR_BUF(chno)) & idma_mask(chno)) ? 1 : 0;
}
EXPORT_SYMBOL_GPL(ipu_idmac_get_current_buffer);
void ipu_idmac_select_buffer(struct ipuv3_channel *channel, u32 buf_num)
{
struct ipu_soc *ipu = channel->ipu;