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41 lines
1.3 KiB
Diff
41 lines
1.3 KiB
Diff
From 0d1ee1f265cf9730feb214ddd18bc430c0800e8b Mon Sep 17 00:00:00 2001
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From: Tim Harvey <tharvey@gateworks.com>
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Date: Tue, 10 Sep 2013 21:42:29 +0200
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Subject: [PATCH] i2c: imx: retry on NAK
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In case of busy i2c try again to get ACK.
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Signed-off-by: Tim Harvey <tharvey@gateworks.com>
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Tested-by: Luka Perkov <luka@openwrt.org>
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---
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drivers/i2c/busses/i2c-imx.c | 4 +++-
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1 file changed, 3 insertions(+), 1 deletion(-)
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--- a/drivers/i2c/busses/i2c-imx.c
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+++ b/drivers/i2c/busses/i2c-imx.c
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@@ -62,6 +62,7 @@
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/* Default value */
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#define IMX_I2C_BIT_RATE 100000 /* 100kHz */
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+#define IMX_I2C_MAX_RETRIES 3 /* number of retries to attempt */
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/* IMX I2C registers */
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#define IMX_I2C_IADR 0x00 /* i2c slave address */
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@@ -198,7 +199,7 @@ static int i2c_imx_acked(struct imx_i2c_
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{
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if (readb(i2c_imx->base + IMX_I2C_I2SR) & I2SR_RXAK) {
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dev_dbg(&i2c_imx->adapter.dev, "<%s> No ACK\n", __func__);
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- return -EIO; /* No ACK */
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+ return -EAGAIN; /* try again */
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}
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dev_dbg(&i2c_imx->adapter.dev, "<%s> ACK received\n", __func__);
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@@ -533,6 +534,7 @@ static int __init i2c_imx_probe(struct p
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i2c_imx->adapter.dev.parent = &pdev->dev;
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i2c_imx->adapter.nr = pdev->id;
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i2c_imx->adapter.dev.of_node = pdev->dev.of_node;
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+ i2c_imx->adapter.retries = IMX_I2C_MAX_RETRIES;
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i2c_imx->base = base;
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pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
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