new file mode 100644
@@ -0,0 +1,22 @@
+--- a/drivers/i2c/busses/i2c-imx.c
++++ b/drivers/i2c/busses/i2c-imx.c
+@@ -461,6 +461,8 @@ 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 -EIO; /* No ACK */
+ }
+
+@@ -1010,6 +1012,10 @@ 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);
On Ventana boards the Gateworks System Controller is the only device on I2C1 (/dev/i2c-0) and it can NAK transfers if it is busy in an ADC loop. Because this is a multi-function device with several slave addresses it is best to add retries at the controller level instead of within each slave driver. This adds a patch that adds 3 retries for i2c transactions only for Ventana boards and only for I2C1 Signed-off-by: Tim Harvey <tharvey@gateworks.com> --- ...x-add-retries-for-NAK-s-on-ventana-boards.patch | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) create mode 100644 target/linux/imx6/patches-4.1/207-i2c-imx-add-retries-for-NAK-s-on-ventana-boards.patch