mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-26 00:41:17 +00:00
39 lines
1.2 KiB
Diff
39 lines
1.2 KiB
Diff
|
From: Tim Harvey <tharvey@gateworks.com>
|
||
|
|
Subject: [PATCH] i2c: imx: retry on NAK
|
||
|
|
|
||
|
|
In case of busy i2c try again to get ACK.
|
||
|
|
|
||
|
|
Signed-off-by: Tim Harvey <tharvey@gateworks.com>
|
||
|
|
Tested-by: Luka Perkov <luka@openwrt.org>
|
||
|
|
---
|
||
|
|
drivers/i2c/busses/i2c-imx.c | 4 +++-
|
||
|
|
1 file changed, 3 insertions(+), 1 deletion(-)
|
||
|
|
|
||
|
|
--- a/drivers/i2c/busses/i2c-imx.c
|
||
|
|
+++ b/drivers/i2c/busses/i2c-imx.c
|
||
|
|
@@ -62,6 +62,7 @@
|
||
|
|
|
||
|
|
/* Default value */
|
||
|
|
#define IMX_I2C_BIT_RATE 100000 /* 100kHz */
|
||
|
|
+#define IMX_I2C_MAX_RETRIES 3 /* number of retries to attempt */
|
||
|
|
|
||
|
|
/* IMX I2C registers */
|
||
|
|
#define IMX_I2C_IADR 0x00 /* i2c slave address */
|
||
|
|
@@ -198,7 +199,7 @@ static int i2c_imx_acked(struct imx_i2c_
|
||
|
|
{
|
||
|
|
if (readb(i2c_imx->base + IMX_I2C_I2SR) & I2SR_RXAK) {
|
||
|
|
dev_dbg(&i2c_imx->adapter.dev, "<%s> No ACK\n", __func__);
|
||
|
|
- return -EIO; /* No ACK */
|
||
|
|
+ return -EAGAIN; /* try again */
|
||
|
|
}
|
||
|
|
|
||
|
|
dev_dbg(&i2c_imx->adapter.dev, "<%s> ACK received\n", __func__);
|
||
|
|
@@ -533,6 +534,7 @@ static int __init i2c_imx_probe(struct p
|
||
|
|
i2c_imx->adapter.dev.parent = &pdev->dev;
|
||
|
|
i2c_imx->adapter.nr = pdev->id;
|
||
|
|
i2c_imx->adapter.dev.of_node = pdev->dev.of_node;
|
||
|
|
+ i2c_imx->adapter.retries = IMX_I2C_MAX_RETRIES;
|
||
|
|
i2c_imx->base = base;
|
||
|
|
|
||
|
|
pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
|