linux-kernel - Re: [PATCH] i2c: aspeed: Update the stop sw state when the bus recovry occurs

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Date: Thu, 30 May 2024 09:47:44 +0200
From: Paul Menzel <pmenzel@...gen.mpg.de>
To: Tommy Huang <tommy_huang@...eedtech.com>
Cc: brendan.higgins@...ux.dev, benh@...nel.crashing.org, joel@....id.au,
 andi.shyti@...nel.org, andrew@...econstruct.com.au, wsa@...nel.org,
 BMC-SW@...eedtech.com, linux-aspeed@...ts.ozlabs.org,
 openbmc@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
 linux-i2c@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] i2c: aspeed: Update the stop sw state when the bus
 recovry occurs

Dear Tommy,


Thank you for your patch.

Am 30.05.24 um 09:06 schrieb Tommy Huang:
> When the i2c bus recovey occurs, driver will send i2c stop command

recove*r*y

> in the scl low condition. In this case the sw state will still keep
> original situation. Under multi-master usage, i2c bus recovery will

What is the user visible problem?

> be called when i2c transfer timeout occurs. Update the stop command
> calling with aspeed_i2c_do_stop function to update master_state.

How can this be tested?

> Fixes: f327c686d3ba ("i2c: aspeed: added driver for Aspeed I2C")
> 

The blank line can be removed.

> Signed-off-by: Tommy Huang <tommy_huang@...eedtech.com>
> ---
>   drivers/i2c/busses/i2c-aspeed.c | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/i2c/busses/i2c-aspeed.c b/drivers/i2c/busses/i2c-aspeed.c
> index ce8c4846b7fa..32f8b0c1c174 100644
> --- a/drivers/i2c/busses/i2c-aspeed.c
> +++ b/drivers/i2c/busses/i2c-aspeed.c
> @@ -169,6 +169,7 @@ struct aspeed_i2c_bus {
>   };
>   
>   static int aspeed_i2c_reset(struct aspeed_i2c_bus *bus);
> +static void aspeed_i2c_do_stop(struct aspeed_i2c_bus *bus);
>   
>   static int aspeed_i2c_recover_bus(struct aspeed_i2c_bus *bus)
>   {
> @@ -187,7 +188,7 @@ static int aspeed_i2c_recover_bus(struct aspeed_i2c_bus *bus)
>   			command);
>   
>   		reinit_completion(&bus->cmd_complete);
> -		writel(ASPEED_I2CD_M_STOP_CMD, bus->base + ASPEED_I2C_CMD_REG);
> +		aspeed_i2c_do_stop(bus);
>   		spin_unlock_irqrestore(&bus->lock, flags);
>   
>   		time_left = wait_for_completion_timeout(


Kind regards,

Paul