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path: root/target/linux/imx6/patches-4.3/207-i2c-imx-add-retries-for-NAK-s-on-ventana-boards.patch
blob: bfb5707ff0ea66619627a28950fc8f91a691170a (plain)
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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);