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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 2012-05-16 17:28:29 +02:00
parent 35de925ffa
commit e90460970f
2 changed files with 10 additions and 0 deletions
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9
drivers/gpu/ipu-v3/ipu-common.c
View File

@ -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;

1
include/video/imx-ipu-v3.h
View File

@ -103,6 +103,7 @@ int ipu_idmac_wait_busy(struct ipuv3_channel *channel, int ms);
void ipu_idmac_set_double_buffer(struct ipuv3_channel *channel,
bool doublebuffer);
int ipu_idmac_get_current_buffer(struct ipuv3_channel *channel);
void ipu_idmac_select_buffer(struct ipuv3_channel *channel, u32 buf_num);
/*