From: Rajesh Gumasta <rgumasta@xxxxxxxxxx>
Dump I2C regsiters for debug when transfer timeout occurs.
Signed-off-by: Rajesh Gumasta <rgumasta@xxxxxxxxxx>
Signed-off-by: Krishna Yarlagadda <kyarlagadda@xxxxxxxxxx>
---
drivers/i2c/busses/i2c-tegra.c | 31 +++++++++++++++++++++++++++++++
1 file changed, 31 insertions(+)
diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
index 77198fc..cdc8664 100644
--- a/drivers/i2c/busses/i2c-tegra.c
+++ b/drivers/i2c/busses/i2c-tegra.c
@@ -126,6 +126,8 @@
#define I2C_HS_INTERFACE_TIMING_THD_STA GENMASK(13, 8)
#define I2C_HS_INTERFACE_TIMING_TSU_STA GENMASK(5, 0)
+#define I2C_MST_PACKET_TRANSFER_CNT_STATUS 0x0b0
+
#define I2C_MST_FIFO_CONTROL 0x0b4
#define I2C_MST_FIFO_CONTROL_RX_FLUSH BIT(0)
#define I2C_MST_FIFO_CONTROL_TX_FLUSH BIT(1)
@@ -1178,6 +1180,33 @@ static int tegra_i2c_issue_bus_clear(struct i2c_adapter *adap)
return -EAGAIN;
}
+static void tegra_i2c_reg_dump(struct tegra_i2c_dev *i2c_dev)
+{
+ dev_dbg(i2c_dev->dev, "--- register dump for debugging ----\n");
+ dev_dbg(i2c_dev->dev, "I2C_CNFG - 0x%x\n",
+ i2c_readl(i2c_dev, I2C_CNFG));
+ dev_dbg(i2c_dev->dev, "I2C_PACKET_TRANSFER_STATUS - 0x%x\n",
+ i2c_readl(i2c_dev, I2C_PACKET_TRANSFER_STATUS));
+ dev_dbg(i2c_dev->dev, "I2C_FIFO_CONTROL - 0x%x\n",
+ i2c_readl(i2c_dev, I2C_FIFO_CONTROL));
+ dev_dbg(i2c_dev->dev, "I2C_FIFO_STATUS - 0x%x\n",
+ i2c_readl(i2c_dev, I2C_FIFO_STATUS));
+
+ if (i2c_dev->hw->has_mst_fifo) {
+ dev_dbg(i2c_dev->dev, "I2C_MST_FIFO_CONTROL - 0x%x\n",
+ i2c_readl(i2c_dev, I2C_MST_FIFO_CONTROL));
+ dev_dbg(i2c_dev->dev, "I2C_MST_FIFO_STATUS - 0x%x\n",
+ i2c_readl(i2c_dev, I2C_MST_FIFO_STATUS));
+ dev_dbg(i2c_dev->dev, "I2C_MST_PACKET_TRANSFER_CNT - 0x%x\n",
+ i2c_readl(i2c_dev,
+ I2C_MST_PACKET_TRANSFER_CNT_STATUS));
+ }
+ dev_dbg(i2c_dev->dev, "I2C_INT_MASK - 0x%x\n",
+ i2c_readl(i2c_dev, I2C_INT_MASK));
+ dev_dbg(i2c_dev->dev, "I2C_INT_STATUS - 0x%x\n",
+ i2c_readl(i2c_dev, I2C_INT_STATUS));
+}
+
static int tegra_i2c_xfer_msg(struct tegra_i2c_dev *i2c_dev,
struct i2c_msg *msg,
enum msg_end_type end_state)
@@ -1331,6 +1360,7 @@ static int tegra_i2c_xfer_msg(struct tegra_i2c_dev *i2c_dev,
if (!time_left && !completion_done(&i2c_dev->dma_complete)) {
dev_err(i2c_dev->dev, "DMA transfer timeout\n");
+ tegra_i2c_reg_dump(i2c_dev);
tegra_i2c_init(i2c_dev, true);
return -ETIMEDOUT;
}
@@ -1352,6 +1382,7 @@ static int tegra_i2c_xfer_msg(struct tegra_i2c_dev *i2c_dev,
if (time_left == 0) {
dev_err(i2c_dev->dev, "i2c transfer timed out\n");
+ tegra_i2c_reg_dump(i2c_dev);
tegra_i2c_init(i2c_dev, true);
return -ETIMEDOUT;
}
--
2.7.4
