[PATCH v3 03/25] i2c: designware: Fix reset call order in dw_i2c_plat_probe()

From: Andy Shevchenko
Date: Fri Nov 10 2023 - 14:06:44 EST


We should not mix managed calls with non-managed. This will break
the calls order at the error path and ->remove() stages. Fix this
by wrapping reset control to become managed one.

With that start checking the rerurn code from reset_control_deassert()
as it may fail and calling assertion in that scenario is not always
a good idea.

Fixes: ab809fd81fde ("i2c: designware: add reset interface")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
---
drivers/i2c/busses/i2c-designware-platdrv.c | 56 ++++++++++++---------
1 file changed, 33 insertions(+), 23 deletions(-)

diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c
index 8b0099e1bc26..648fb84e574d 100644
--- a/drivers/i2c/busses/i2c-designware-platdrv.c
+++ b/drivers/i2c/busses/i2c-designware-platdrv.c
@@ -285,6 +285,28 @@ static void i2c_dw_remove_lock_support(struct dw_i2c_dev *dev)
i2c_dw_semaphore_cb_table[dev->semaphore_idx].remove(dev);
}

+static void dw_i2c_plat_assert_reset(void *data)
+{
+ struct dw_i2c_dev *dev = data;
+
+ reset_control_assert(dev->rst);
+}
+
+static int dw_i2c_plat_get_reset(struct dw_i2c_dev *dev)
+{
+ int ret;
+
+ dev->rst = devm_reset_control_get_optional_exclusive(dev->dev, NULL);
+ if (IS_ERR(dev->rst))
+ return PTR_ERR(dev->rst);
+
+ ret = reset_control_deassert(dev->rst);
+ if (ret)
+ return ret;
+
+ return devm_add_action_or_reset(dev->dev, dw_i2c_plat_assert_reset, dev);
+}
+
static int dw_i2c_plat_probe(struct platform_device *pdev)
{
struct i2c_adapter *adap;
@@ -312,11 +334,9 @@ static int dw_i2c_plat_probe(struct platform_device *pdev)
if (ret)
return ret;

- dev->rst = devm_reset_control_get_optional_exclusive(&pdev->dev, NULL);
- if (IS_ERR(dev->rst))
- return PTR_ERR(dev->rst);
-
- reset_control_deassert(dev->rst);
+ ret = dw_i2c_plat_get_reset(dev);
+ if (ret)
+ return ret;

t = &dev->timings;
i2c_parse_fw_timings(&pdev->dev, t, false);
@@ -331,30 +351,26 @@ static int dw_i2c_plat_probe(struct platform_device *pdev)

ret = i2c_dw_validate_speed(dev);
if (ret)
- goto exit_reset;
+ return ret;

ret = i2c_dw_probe_lock_support(dev);
if (ret)
- goto exit_reset;
+ return ret;

i2c_dw_configure(dev);

/* Optional interface clock */
dev->pclk = devm_clk_get_optional(&pdev->dev, "pclk");
- if (IS_ERR(dev->pclk)) {
- ret = PTR_ERR(dev->pclk);
- goto exit_reset;
- }
+ if (IS_ERR(dev->pclk))
+ return PTR_ERR(dev->pclk);

dev->clk = devm_clk_get_optional(&pdev->dev, NULL);
- if (IS_ERR(dev->clk)) {
- ret = PTR_ERR(dev->clk);
- goto exit_reset;
- }
+ if (IS_ERR(dev->clk))
+ return PTR_ERR(dev->clk);

ret = i2c_dw_prepare_clk(dev, true);
if (ret)
- goto exit_reset;
+ return ret;

if (dev->clk) {
u64 clk_khz;
@@ -395,13 +411,9 @@ static int dw_i2c_plat_probe(struct platform_device *pdev)

ret = dw_i2c_plat_pm_setup(dev);
if (ret)
- goto exit_reset;
+ return ret;

return i2c_dw_probe(dev);
-
-exit_reset:
- reset_control_assert(dev->rst);
- return ret;
}

static void dw_i2c_plat_remove(struct platform_device *pdev)
@@ -418,8 +430,6 @@ static void dw_i2c_plat_remove(struct platform_device *pdev)
pm_runtime_put_sync(&pdev->dev);

i2c_dw_remove_lock_support(dev);
-
- reset_control_assert(dev->rst);
}

static int dw_i2c_plat_prepare(struct device *dev)
--
2.43.0.rc1.1.gbec44491f096