Linux 2.6.31 Release for Digi ConnectCore Wi-i.MX boards2.6.31-digi-201102101717

1 files changed, 32 insertions, 0 deletions

diff --git a/drivers/mxc/ipu/ipu_common.c b/drivers/mxc/ipu/ipu_common.c
index 43ba100b5c5d..a1dc566e7f8f 100644
--- a/drivers/mxc/ipu/ipu_common.c
+++ b/drivers/mxc/ipu/ipu_common.c
@@ -707,6 +707,38 @@ int32_t ipu_select_buffer(ipu_channel_t channel, ipu_buffer_t type,
 }
 
 /*!
+ * This function check buffer ready for a logical channel.
+ *
+ * @param       channel         Input parameter for the logical channel ID.
+ *
+ * @param       type            Input parameter which buffer to clear.
+ *
+ * @param       bufNum          Input parameter for which buffer number clear
+ * 				ready state.
+ *
+ */
+int32_t ipu_check_buffer_busy(ipu_channel_t channel, ipu_buffer_t type,
+		uint32_t bufNum)
+{
+	uint32_t dma_chan = channel_2_dma(channel, type);
+	uint32_t reg;
+
+	if (dma_chan == IDMA_CHAN_INVALID)
+		return -EINVAL;
+
+	if (bufNum == 0)
+		reg = __raw_readl(IPU_CHA_BUF0_RDY);
+	else
+		reg = __raw_readl(IPU_CHA_BUF1_RDY);
+
+	if (reg & (1UL << dma_chan))
+		return 1;
+	else
+		return 0;
+}
+EXPORT_SYMBOL(ipu_check_buffer_busy);
+
+/*!
  * This function links 2 channels together for automatic frame
  * synchronization. The output of the source channel is linked to the input of
  * the destination channel.