This is a note to let you know that I've just added the patch titled
i2c: imx-lpi2c: return -EINVAL when i2c peripheral clk doesn't work
to the 6.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
i2c-imx-lpi2c-return-einval-when-i2c-peripheral-clk-.patch
and it can be found in the queue-6.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit b11cb2f0a9ccd77f59928aa09f6425c74390799c
Author: Carlos Song <carlos.song@xxxxxxx>
Date: Wed Jul 26 17:22:38 2023 +0800
i2c: imx-lpi2c: return -EINVAL when i2c peripheral clk doesn't work
[ Upstream commit b610c4bbd153c2cde548db48559e170905d7c369 ]
On MX8X platforms, the default clock rate is 0 if without explicit
clock setting in dts nodes. I2c can't work when i2c peripheral clk
rate is 0.
Add a i2c peripheral clk rate check before configuring the clock
register. When i2c peripheral clk rate is 0 and directly return
-EINVAL.
Signed-off-by: Carlos Song <carlos.song@xxxxxxx>
Acked-by: Dong Aisheng <Aisheng.dong@xxxxxxx>
Reviewed-by: Andi Shyti <andi.shyti@xxxxxxxxxx>
Signed-off-by: Wolfram Sang <wsa@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/i2c/busses/i2c-imx-lpi2c.c b/drivers/i2c/busses/i2c-imx-lpi2c.c
index 4d24ceb57ee74..338171f76daf7 100644
--- a/drivers/i2c/busses/i2c-imx-lpi2c.c
+++ b/drivers/i2c/busses/i2c-imx-lpi2c.c
@@ -209,6 +209,9 @@ static int lpi2c_imx_config(struct lpi2c_imx_struct *lpi2c_imx)
lpi2c_imx_set_mode(lpi2c_imx);
clk_rate = clk_get_rate(lpi2c_imx->clks[0].clk);
+ if (!clk_rate)
+ return -EINVAL;
+
if (lpi2c_imx->mode == HS || lpi2c_imx->mode == ULTRA_FAST)
filt = 0;
else
