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 --- drivers/gpu/ipu-v3/ipu-common.c | 9 +++++++++ include/video/imx-ipu-v3.h | 1 + 2 files changed, 10 insertions(+)
diff --git a/drivers/gpu/ipu-v3/ipu-common.c b/drivers/gpu/ipu-v3/ipu-common.c index 6b3f4f1..706a6f2 100644 --- a/drivers/gpu/ipu-v3/ipu-common.c +++ b/drivers/gpu/ipu-v3/ipu-common.c @@ -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; diff --git a/include/video/imx-ipu-v3.h b/include/video/imx-ipu-v3.h index 2c71ba7..a7edf6a 100644 --- a/include/video/imx-ipu-v3.h +++ b/include/video/imx-ipu-v3.h @@ -104,6 +104,7 @@ 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);
/*