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 designware I2C controller.
Signed-off-by: Vincenzo Frascino <vincenzo.frasc...@st.com>
Signed-off-by: Shiraz Hashim <shiraz.has...@st.com>
Signed-off-by: Viresh Kumar <viresh.ku...@linaro.org>
---
V6->V7:
- removed include/linux/i2c/i2c-designware.h and use struct
i2c_bus_recovery_info as platform data.
- initialize recover_bus with i2c_generic_gpio_recovery()
drivers/i2c/busses/i2c-designware-core.c | 6 +++++-
drivers/i2c/busses/i2c-designware-platdrv.c | 18 ++++++++++++++++--
2 files changed, 21 insertions(+), 3 deletions(-)
diff --git a/drivers/i2c/busses/i2c-designware-core.c
b/drivers/i2c/busses/i2c-designware-core.c
index cbba7db..24feaaf 100644
--- a/drivers/i2c/busses/i2c-designware-core.c
+++ b/drivers/i2c/busses/i2c-designware-core.c
@@ -538,7 +538,11 @@ 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 (adap->bus_recovery_info) {
+ dev_dbg(dev->dev, "try i2c bus recovery\n");
+ adap->bus_recovery_info->recover_bus(adap);
+ }
+
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 0506fef..c7725b2 100644
--- a/drivers/i2c/busses/i2c-designware-platdrv.c
+++ b/drivers/i2c/busses/i2c-designware-platdrv.c
@@ -55,6 +55,7 @@ static int __devinit dw_i2c_probe(struct platform_device
*pdev)
struct dw_i2c_dev *dev;
struct i2c_adapter *adap;
struct resource *mem, *ioarea;
+ struct i2c_bus_recovery_info *recovery_info;
int irq, r;
/* NOTE: driver uses the static register mapping */
@@ -141,17 +142,28 @@ static int __devinit dw_i2c_probe(struct platform_device
*pdev)
adap->dev.parent = &pdev->dev;
adap->dev.of_node = pdev->dev.of_node;
+ /* Bus recovery support */
+ recovery_info = dev_get_platdata(&pdev->dev);
+ if (recovery_info) {
+ recovery_info->recover_bus = i2c_generic_gpio_recovery;
+ recovery_info->clock_rate_khz = clk_get_rate(dev->clk) / 1000;
+ adap->bus_recovery_info = recovery_info;
+ } else {
+ adap->bus_recovery_info = NULL;
+ }
+
adap->nr = pdev->id;
r = i2c_add_numbered_adapter(adap);
if (r) {
dev_err(&pdev->dev, "failure adding adapter\n");
- goto err_free_irq;
+ goto err_free_recovery_info;
}
of_i2c_register_devices(adap);
return 0;
-err_free_irq:
+err_free_recovery_info:
+ kfree(recovery_info);
free_irq(dev->irq, dev);
err_iounmap:
iounmap(dev->base);
@@ -174,6 +186,8 @@ static int __devexit dw_i2c_remove(struct platform_device
*pdev)
struct dw_i2c_dev *dev = platform_get_drvdata(pdev);
struct resource *mem;
+ kfree(dev->adapter.bus_recovery_info);
+
platform_set_drvdata(pdev, NULL);
i2c_del_adapter(&dev->adapter);
put_device(&pdev->dev);
--
1.7.12.rc2.18.g61b472e
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