Re: [PATCH 1/4] i2c: i801: Use i2c_mark_adapter_suspended/resumed

[Andi Shyti <andi.shyti@kernel.org>]

Hi Heiner,

On Sat, Mar 04, 2023 at 10:31:23PM +0100, Heiner Kallweit wrote:
> When entering the shutdown/remove/suspend callbacks, at first we should
> ensure that transfers are finished and I2C core can't start further
> transfers. Use i2c_mark_adapter_suspended() for this purpose.
> 
> Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
> ---
>  drivers/i2c/busses/i2c-i801.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/drivers/i2c/busses/i2c-i801.c b/drivers/i2c/busses/i2c-i801.c
> index ac5326747..d6a0c3b53 100644
> --- a/drivers/i2c/busses/i2c-i801.c
> +++ b/drivers/i2c/busses/i2c-i801.c
> @@ -1773,6 +1773,8 @@ static void i801_remove(struct pci_dev *dev)
>  {
>  	struct i801_priv *priv = pci_get_drvdata(dev);
>  
> +	i2c_mark_adapter_suspended(&priv->adapter);
> +
>  	outb_p(priv->original_hstcnt, SMBHSTCNT(priv));
>  	i801_disable_host_notify(priv);
>  	i801_del_mux(priv);
> @@ -1796,6 +1798,8 @@ static void i801_shutdown(struct pci_dev *dev)
>  {
>  	struct i801_priv *priv = pci_get_drvdata(dev);
>  
> +	i2c_mark_adapter_suspended(&priv->adapter);
> +

is this really needed in the shutdown and remove function?

I'm OK with it, though.

>  	/* Restore config registers to avoid hard hang on some systems */
>  	outb_p(priv->original_hstcnt, SMBHSTCNT(priv));
>  	i801_disable_host_notify(priv);
> @@ -1807,6 +1811,7 @@ static int i801_suspend(struct device *dev)
>  {
>  	struct i801_priv *priv = dev_get_drvdata(dev);
>  
> +	i2c_mark_adapter_suspended(&priv->adapter);
>  	outb_p(priv->original_hstcnt, SMBHSTCNT(priv));
>  	pci_write_config_byte(priv->pci_dev, SMBHSTCFG, priv->original_hstcfg);
>  	return 0;
> @@ -1818,6 +1823,7 @@ static int i801_resume(struct device *dev)
>  
>  	i801_setup_hstcfg(priv);
>  	i801_enable_host_notify(&priv->adapter);
> +	i2c_mark_adapter_resumed(&priv->adapter);

BTW, I see that very few drivers are using suspended and resumed
and I wonder why. Should these perhaps be added in the basic pm
functions?

I'm OK to r-b this, but i want first Jean to give it an ack.

Andi