Re: [PATCH V2 6/7] i2c: sprd: Increase the waiting time for I2C transmission to avoid system crash issues

Andi Shyti
2023-10-24T21:38:44Z

Hi Huangzheng,

On Mon, Oct 23, 2023 at 04:11:57PM +0800, Huangzheng Lai wrote:
> Due to the relatively low priority of the isr_thread, when the CPU
> load is high, the execution of sprd_i2c_isr_thread will be delayed.
> After the waiting time is exceeded, the I2C driver will perform
> operations such as disabling the I2C controller. Later, when
> sprd_i2c_isr_thread is called by the CPU, there will be kernel panic
> caused by illegal access to the IIC register. After pressure testing,
> we found that increasing the IIC waiting time to 10 seconds can
> avoid this problem.
>
> Fixes: 0b884fe71f9e ("i2c: sprd: use a specific timeout to avoid system hang up issue")
> Cc: <stable@vger.kernel.org> # v5.11+
> Signed-off-by: Huangzheng Lai <Huangzheng.Lai@unisoc.com>

Acked-by: Andi Shyti <andi.shyti@kernel.org>

Andi

> ---
> drivers/i2c/busses/i2c-sprd.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/i2c/busses/i2c-sprd.c b/drivers/i2c/busses/i2c-sprd.c
> index b65729ba7d5a..dbdac89ad482 100644
> --- a/drivers/i2c/busses/i2c-sprd.c
> +++ b/drivers/i2c/busses/i2c-sprd.c
> @@ -74,7 +74,7 @@
> /* timeout (ms) for pm runtime autosuspend */
> #define SPRD_I2C_PM_TIMEOUT 1000
> /* timeout (ms) for transfer message */
> -#define I2C_XFER_TIMEOUT 1000
> +#define I2C_XFER_TIMEOUT 10000
> /* dynamic modify clk_freq flag */
> #define I2C_3M4_FLAG 0x0100
> #define I2C_1M_FLAG 0x0080
> --
> 2.17.1
>