imx6: add 4.4 support

[openwrt.git] / target / linux / imx6 / patches-4.4 / 207-i2c-imx-add-retries-for-NAK-s-on-ventana-boards.patch

diff --git a/target/linux/imx6/patches-4.4/207-i2c-imx-add-retries-for-NAK-s-on-ventana-boards.patch b/target/linux/imx6/patches-4.4/207-i2c-imx-add-retries-for-NAK-s-on-ventana-boards.patch
new file mode 100644 (file)
index 0000000..700513a
--- /dev/null
+++ b/target/linux/imx6/patches-4.4/207-i2c-imx-add-retries-for-NAK-s-on-ventana-boards.patch
@@ -0,0 +1,22 @@
+--- a/drivers/i2c/busses/i2c-imx.c
++++ b/drivers/i2c/busses/i2c-imx.c
+@@ -468,6 +468,8 @@ static int i2c_imx_acked(struct imx_i2c_
+ {
+       if (imx_i2c_read_reg(i2c_imx, IMX_I2C_I2SR) & I2SR_RXAK) {
+               dev_dbg(&i2c_imx->adapter.dev, "<%s> No ACK\n", __func__);
++              if (i2c_imx->adapter.retries)
++                      return -EAGAIN;
+               return -ENXIO;  /* No ACK */
+       }
+ 
+@@ -1073,6 +1075,10 @@ static int i2c_imx_probe(struct platform
+       i2c_imx->adapter.nr             = pdev->id;
+       i2c_imx->adapter.dev.of_node    = pdev->dev.of_node;
+       i2c_imx->base                   = base;
++      if (of_machine_is_compatible("gw,ventana") && phy_addr == 0x021a0000) {
++              dev_info(&pdev->dev, "Adding retries for Ventana GSC\n");
++              i2c_imx->adapter.retries = 3;
++      }
+ 
+       /* Get I2C clock */
+       i2c_imx->clk = devm_clk_get(&pdev->dev, NULL);