linux-kernel - Re: [RFC PATCH v2 6/7] i2c: tegra-bpmp: convert to use new atomic callbacks

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Date:   Fri, 15 Mar 2019 13:42:32 +0100
From:   Simon Horman <horms@...ge.net.au>
To:     Wolfram Sang <wsa+renesas@...g-engineering.com>
Cc:     linux-i2c@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Keerthy <j-keerthy@...com>, Peter Rosin <peda@...ntia.se>,
        Tony Lindgren <tony@...mide.com>,
        Russell King <linux@...linux.org.uk>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Stefan Lengfeld <contact@...fanchrist.eu>,
        Phil Reid <preid@...ctromag.com.au>,
        Tero Kristo <t-kristo@...com>, linux-omap@...r.kernel.org,
        linux-tegra@...r.kernel.org
Subject: Re: [RFC PATCH v2 6/7] i2c: tegra-bpmp: convert to use new atomic
 callbacks

On Sat, Mar 02, 2019 at 02:47:34PM +0100, Wolfram Sang wrote:
> The driver did handle this internally, convert it to use the new
> callbacks.
> 
> Signed-off-by: Wolfram Sang <wsa+renesas@...g-engineering.com>

Reviewed-by: Simon Horman <horms+renesas@...ge.net.au>

> ---
>  drivers/i2c/busses/i2c-tegra-bpmp.c | 27 ++++++++++++++++++++++-----
>  1 file changed, 22 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/i2c/busses/i2c-tegra-bpmp.c b/drivers/i2c/busses/i2c-tegra-bpmp.c
> index f6cd35d0a2ac..02b78ba5b23b 100644
> --- a/drivers/i2c/busses/i2c-tegra-bpmp.c
> +++ b/drivers/i2c/busses/i2c-tegra-bpmp.c
> @@ -207,7 +207,8 @@ static int tegra_bpmp_i2c_msg_len_check(struct i2c_msg *msgs, unsigned int num)
>  
>  static int tegra_bpmp_i2c_msg_xfer(struct tegra_bpmp_i2c *i2c,
>  				   struct mrq_i2c_request *request,
> -				   struct mrq_i2c_response *response)
> +				   struct mrq_i2c_response *response,
> +				   bool atomic)
>  {
>  	struct tegra_bpmp_message msg;
>  	int err;
> @@ -222,7 +223,7 @@ static int tegra_bpmp_i2c_msg_xfer(struct tegra_bpmp_i2c *i2c,
>  	msg.rx.data = response;
>  	msg.rx.size = sizeof(*response);
>  
> -	if (irqs_disabled())
> +	if (atomic)
>  		err = tegra_bpmp_transfer_atomic(i2c->bpmp, &msg);
>  	else
>  		err = tegra_bpmp_transfer(i2c->bpmp, &msg);
> @@ -230,8 +231,9 @@ static int tegra_bpmp_i2c_msg_xfer(struct tegra_bpmp_i2c *i2c,
>  	return err;
>  }
>  
> -static int tegra_bpmp_i2c_xfer(struct i2c_adapter *adapter,
> -			       struct i2c_msg *msgs, int num)
> +static int tegra_bpmp_i2c_xfer_common(struct i2c_adapter *adapter,
> +				      struct i2c_msg *msgs, int num,
> +				      bool atomic)
>  {
>  	struct tegra_bpmp_i2c *i2c = i2c_get_adapdata(adapter);
>  	struct mrq_i2c_response response;
> @@ -253,7 +255,7 @@ static int tegra_bpmp_i2c_xfer(struct i2c_adapter *adapter,
>  		return err;
>  	}
>  
> -	err = tegra_bpmp_i2c_msg_xfer(i2c, &request, &response);
> +	err = tegra_bpmp_i2c_msg_xfer(i2c, &request, &response, atomic);
>  	if (err < 0) {
>  		dev_err(i2c->dev, "failed to transfer message: %d\n", err);
>  		return err;
> @@ -268,6 +270,20 @@ static int tegra_bpmp_i2c_xfer(struct i2c_adapter *adapter,
>  	return num;
>  }
>  
> +static int tegra_bpmp_i2c_xfer(struct i2c_adapter *adapter,
> +			       struct i2c_msg *msgs, int num)
> +
> +{
> +	return tegra_bpmp_i2c_xfer_common(adapter, msgs, num, false);
> +}
> +
> +static int tegra_bpmp_i2c_xfer_atomic(struct i2c_adapter *adapter,
> +				      struct i2c_msg *msgs, int num)
> +
> +{
> +	return tegra_bpmp_i2c_xfer_common(adapter, msgs, num, true);
> +}
> +
>  static u32 tegra_bpmp_i2c_func(struct i2c_adapter *adapter)
>  {
>  	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL | I2C_FUNC_10BIT_ADDR |
> @@ -276,6 +292,7 @@ static u32 tegra_bpmp_i2c_func(struct i2c_adapter *adapter)
>  
>  static const struct i2c_algorithm tegra_bpmp_i2c_algo = {
>  	.master_xfer = tegra_bpmp_i2c_xfer,
> +	.master_xfer_atomic = tegra_bpmp_i2c_xfer_atomic,
>  	.functionality = tegra_bpmp_i2c_func,
>  };
>  
> -- 
> 2.11.0
>