gpu: ipu-v3: Add ipu_idmac_get_current_buffer function
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>
diff --git a/drivers/gpu/ipu-v3/ipu-common.c b/drivers/gpu/ipu-v3/ipu-common.c
index 2aecc47..9459f40 100644
--- a/drivers/gpu/ipu-v3/ipu-common.c
+++ b/drivers/gpu/ipu-v3/ipu-common.c
@@ -661,6 +661,15 @@
}
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;