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-rw-r--r--target/linux/imx6/patches-4.3/207-i2c-imx-add-retries-for-NAK-s-on-ventana-boards.patch24
1 files changed, 24 insertions, 0 deletions
diff --git a/target/linux/imx6/patches-4.3/207-i2c-imx-add-retries-for-NAK-s-on-ventana-boards.patch b/target/linux/imx6/patches-4.3/207-i2c-imx-add-retries-for-NAK-s-on-ventana-boards.patch
new file mode 100644
index 0000000000..bfb5707ff0
--- /dev/null
+++ b/target/linux/imx6/patches-4.3/207-i2c-imx-add-retries-for-NAK-s-on-ventana-boards.patch
@@ -0,0 +1,24 @@
+Index: linux-4.3/drivers/i2c/busses/i2c-imx.c
+===================================================================
+--- linux-4.3.orig/drivers/i2c/busses/i2c-imx.c 2015-11-01 16:05:25.000000000 -0800
++++ linux-4.3/drivers/i2c/busses/i2c-imx.c 2015-12-18 10:39:44.971158318 -0800
+@@ -461,6 +461,8 @@
+ {
+ 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 @@
+ 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);