[PATCH] i2c: imx-lpi2c: change to PIO mode in system-wide suspend/resume progress
From: Carlos Song <hidden>
Date: 2025-11-18 07:19:17
Also in:
imx, linux-i2c, lkml
Subsystem:
freescale imx lpi2c driver, i2c subsystem, i2c subsystem host drivers, the rest · Maintainers:
Dong Aisheng, Andi Shyti, Linus Torvalds
If a system-wide suspend or resume transition is in progress. LPI2C should
use PIO to transfer data not DMA to avoid issue caused by not ready DMA HW
resource.
Fixes: a09c8b3f9047 ("i2c: imx-lpi2c: add eDMA mode support for LPI2C")
Signed-off-by: Carlos Song <redacted>
---
drivers/i2c/busses/i2c-imx-lpi2c.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/i2c/busses/i2c-imx-lpi2c.c b/drivers/i2c/busses/i2c-imx-lpi2c.c
index 2a0962a0b441..5050e14a9919 100644
--- a/drivers/i2c/busses/i2c-imx-lpi2c.c
+++ b/drivers/i2c/busses/i2c-imx-lpi2c.c@@ -592,6 +592,13 @@ static bool is_use_dma(struct lpi2c_imx_struct *lpi2c_imx, struct i2c_msg *msg) if (!lpi2c_imx->can_use_dma) return false; + /* + * When system is in suspend process. LPI2C should use PIO to transfer data to + * avoid issue caused by not ready DMA HW resource. + */ + if (pm_suspend_in_progress()) + return false; + /* * When the length of data is less than I2C_DMA_THRESHOLD, * cpu mode is used directly to avoid low performance.
--
2.34.1