If the dma controller is not yet probed, defer i2c probe.
The error path in probe was slightly modified (no functional change)
to avoid triggering this WARN_ON():
"cg-pll0-div1 already disabled
WARNING: CPU: 1 PID: 1 at drivers/clk/clk.c:828 clk_core_disable+0xa8/0xb0"
Signed-off-by: Laurentiu Tudor <laurentiu.tudor@xxxxxxx>
---
Changes in v2:
- rebased on latest i2c tree
- fix small error introduced by a previous commit (first patch)
drivers/i2c/busses/i2c-imx.c | 21 +++++++++++++--------
1 file changed, 13 insertions(+), 8 deletions(-)
diff --git a/drivers/i2c/busses/i2c-imx.c b/drivers/i2c/busses/i2c-imx.c
index 42fed40198a0..4e34b1572756 100644
--- a/drivers/i2c/busses/i2c-imx.c
+++ b/drivers/i2c/busses/i2c-imx.c
@@ -1111,7 +1111,8 @@ static int i2c_imx_probe(struct platform_device *pdev)
pdev->name, i2c_imx);
if (ret) {
dev_err(&pdev->dev, "can't claim irq %d\n", irq);
- goto clk_disable;
+ clk_disable_unprepare(i2c_imx->clk);
+ return ret;
}
/* Init queue */
@@ -1161,19 +1162,25 @@ static int i2c_imx_probe(struct platform_device *pdev)
pm_runtime_mark_last_busy(&pdev->dev);
pm_runtime_put_autosuspend(&pdev->dev);
+ /* Init DMA config if supported */
+ ret = i2c_imx_dma_request(i2c_imx, phy_addr);
+ if (ret) {
+ if (ret != -EPROBE_DEFER)
+ dev_info(&pdev->dev, "can't use DMA, using PIO instead.\n");
+ else
+ goto del_adapter;
+ }
+
dev_dbg(&i2c_imx->adapter.dev, "claimed irq %d\n", irq);
dev_dbg(&i2c_imx->adapter.dev, "device resources: %pR\n", res);
dev_dbg(&i2c_imx->adapter.dev, "adapter name: \"%s\"\n",
i2c_imx->adapter.name);
- /* Init DMA config if supported */
- ret = i2c_imx_dma_request(i2c_imx, phy_addr);
- if (ret < 0)
- goto clk_notifier_unregister;
-
dev_info(&i2c_imx->adapter.dev, "IMX I2C adapter registered\n");
return 0; /* Return OK */
+del_adapter:
+ i2c_del_adapter(&i2c_imx->adapter);
clk_notifier_unregister:
clk_notifier_unregister(i2c_imx->clk, &i2c_imx->clk_change_nb);
rpm_disable:
@@ -1182,8 +1189,6 @@ static int i2c_imx_probe(struct platform_device *pdev)
pm_runtime_set_suspended(&pdev->dev);
pm_runtime_dont_use_autosuspend(&pdev->dev);
-clk_disable:
- clk_disable_unprepare(i2c_imx->clk);
return ret;
}
--
2.17.1
