linux-kernel - Re: [PATCH v2] i2c: aspeed: Update the stop sw state when the bus recovery occurs

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Date: Thu, 27 Jun 2024 17:25:33 +0200
From: Andi Shyti <andi.shyti@...nel.org>
To: Tommy Huang <tommy_huang@...eedtech.com>
Cc: brendan.higgins@...ux.dev, benh@...nel.crashing.org, joel@....id.au, 
	andrew@...econstruct.com.au, wsa@...nel.org, linux-i2c@...r.kernel.org, 
	openbmc@...ts.ozlabs.org, linux-arm-kernel@...ts.infradead.org, 
	linux-aspeed@...ts.ozlabs.org, linux-kernel@...r.kernel.org, stable@...r.kernel.org, 
	BMC-SW@...eedtech.com
Subject: Re: [PATCH v2] i2c: aspeed: Update the stop sw state when the bus
 recovery occurs

Hi Tommy,

any update on this patch?

Andi

On Sat, Jun 08, 2024 at 12:36:53PM GMT, Tommy Huang wrote:
> When the i2c bus recovery occurs, driver will send i2c stop command
> in the scl low condition. In this case the sw state will still keep
> original situation. Under multi-master usage, i2c bus recovery will
> be called when i2c transfer timeout occurs. Update the stop command
> calling with aspeed_i2c_do_stop function to update master_state.
> 
> Fixes: f327c686d3ba ("i2c: aspeed: added driver for Aspeed I2C")
> 
> Cc: <stable@...r.kernel.org> # v4.13+
> Signed-off-by: Tommy Huang <tommy_huang@...eedtech.com>
> ---
>  drivers/i2c/busses/i2c-aspeed.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/i2c/busses/i2c-aspeed.c b/drivers/i2c/busses/i2c-aspeed.c
> index ce8c4846b7fa..be64e419adf0 100644
> --- a/drivers/i2c/busses/i2c-aspeed.c
> +++ b/drivers/i2c/busses/i2c-aspeed.c
> @@ -25,6 +25,8 @@
>  #include <linux/reset.h>
>  #include <linux/slab.h>
>  
> +static void aspeed_i2c_do_stop(struct aspeed_i2c_bus *bus);
> +
>  /* I2C Register */
>  #define ASPEED_I2C_FUN_CTRL_REG				0x00
>  #define ASPEED_I2C_AC_TIMING_REG1			0x04
> @@ -187,7 +189,7 @@ 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(
> -- 
> 2.25.1
> 
> 
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

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