Add bus recovery support for designware_i2c controller. It uses generic gpio
based i2c_gpio_recover_bus() routine. Platforms need to pass struct
i2c_bus_recovery_info as platform data to designware I2C controller.
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@xxxxxx>
Signed-off-by: Shiraz Hashim <shiraz.hashim@xxxxxx>
Signed-off-by: Viresh Kumar <viresh.kumar@xxxxxxxxxx>
---
This patch isn't drawing attention since sometime, so sending it again.
drivers/i2c/busses/i2c-designware-core.c | 5 ++++-
drivers/i2c/busses/i2c-designware-platdrv.c | 6 ++++++
2 files changed, 10 insertions(+), 1 deletion(-)
diff --git a/drivers/i2c/busses/i2c-designware-core.c b/drivers/i2c/busses/i2c-designware-core.c
index c41ca63..5ecb2f0 100644
--- a/drivers/i2c/busses/i2c-designware-core.c
+++ b/drivers/i2c/busses/i2c-designware-core.c
@@ -583,7 +583,10 @@ i2c_dw_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
ret = wait_for_completion_interruptible_timeout(&dev->cmd_complete, HZ);
if (ret == 0) {
dev_err(dev->dev, "controller timed out\n");
- i2c_dw_init(dev);
+
+ if (i2c_recover_bus(adap) < 0)
+ i2c_dw_init(dev);
+
ret = -ETIMEDOUT;
goto done;
} else if (ret < 0)
diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c
index 35b70a1..c3ada3e 100644
--- a/drivers/i2c/busses/i2c-designware-platdrv.c
+++ b/drivers/i2c/busses/i2c-designware-platdrv.c
@@ -162,6 +162,12 @@ static int dw_i2c_probe(struct platform_device *pdev)
adap->dev.parent = &pdev->dev;
adap->dev.of_node = pdev->dev.of_node;
+ /* Bus recovery support */
+ adap->bus_recovery_info = dev_get_platdata(&pdev->dev);
+ if (adap->bus_recovery_info)
+ adap->bus_recovery_info->recover_bus =
+ i2c_generic_gpio_recovery;
+
r = i2c_add_numbered_adapter(adap);
if (r) {
dev_err(&pdev->dev, "failure adding adapter\n");
--
1.7.12.rc2.18.g61b472e
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