i2c: tegra: Add debug prints for i2c timed out case
Chaitanya Bandi [Mon, 26 Aug 2013 11:22:28 +0000 (16:22 +0530)]
Added debug prints for i2c timed out case to
help debug.

Change-Id: Ib0696b8237b90cd511ac224a476dede8fae60ceb
Signed-off-by: Chaitanya Bandi <bandik@nvidia.com>
Reviewed-on: http://git-master/r/266050
GVS: Gerrit_Virtual_Submit
Reviewed-by: Laxman Dewangan <ldewangan@nvidia.com>

drivers/i2c/busses/i2c-tegra.c

index a5c5a20..dc36872 100644 (file)
@@ -888,6 +888,27 @@ static int tegra_i2c_xfer_msg(struct tegra_i2c_bus *i2c_bus,
 
        ret = wait_for_completion_timeout(&i2c_dev->msg_complete,
                                        TEGRA_I2C_TIMEOUT);
+       if (ret == 0) {
+
+               dev_err(i2c_dev->dev, "--- register dump for debugging ----\n");
+               dev_err(i2c_dev->dev, "I2C_CNFG - 0x%x\n", i2c_readl(i2c_dev, I2C_CNFG));
+               dev_err(i2c_dev->dev, "I2C_PACKET_TRANSFER_STATUS - 0x%x\n", i2c_readl(i2c_dev, I2C_PACKET_TRANSFER_STATUS));
+               dev_err(i2c_dev->dev, "I2C_FIFO_CONTROL - 0x%x\n", i2c_readl(i2c_dev, I2C_FIFO_CONTROL));
+               dev_err(i2c_dev->dev, "I2C_FIFO_STATUS - 0x%x\n", i2c_readl(i2c_dev, I2C_FIFO_STATUS));
+               dev_err(i2c_dev->dev, "I2C_INT_MASK - 0x%x\n", i2c_readl(i2c_dev, I2C_INT_MASK));
+               dev_err(i2c_dev->dev, "I2C_INT_STATUS - 0x%x\n", i2c_readl(i2c_dev, I2C_INT_STATUS));
+
+               dev_err(i2c_dev->dev, "msg->len - %d\n", msg->len);
+               dev_err(i2c_dev->dev, "is_msg_write - %d\n", !(msg->flags & I2C_M_RD));
+               if (next_msg != NULL) {
+                       dev_err(i2c_dev->dev, "next_msg->len - %d\n", next_msg->len);
+                       dev_err(i2c_dev->dev, "is_next_msg_write - %d\n", !(next_msg->flags & I2C_M_RD));
+               }
+               dev_err(i2c_dev->dev, "buf_remaining - %d\n", i2c_dev->msg_buf_remaining);
+
+
+       }
+
        tegra_i2c_mask_irq(i2c_dev, int_mask);
 
        if (i2c_dev->is_dvc)