linux-kernel - Re: [PATCH v3 1/2] i2c: tegra: add separate function for config

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Date:	Tue, 19 Apr 2016 10:31:41 +0100
From:	Jon Hunter <jonathanh@...dia.com>
To:	Shardar Shariff Md <smohammed@...dia.com>, <ldewangan@...dia.com>,
	<swarren@...dotorg.org>, <thierry.reding@...il.com>,
	<linux-i2c@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <wsa@...-dreams.de>,
	<gnurou@...il.com>
Subject: Re: [PATCH v3 1/2] i2c: tegra: add separate function for config_load


On 18/04/16 14:15, Shardar Shariff Md wrote:
> - Define separate function for configuration load register handling
> to make it use by different functions later.
> - Instead of calculating timeout for the config load during init,
> calculate it when config load register is written. Also use the
> msecs_to_jiffies for timeout calculation instead of macro HZ.
> 
> Signed-off-by: Shardar Shariff Md <smohammed@...dia.com>
> 
> Changes since v1:
> - Add separate function for config load handling
> ---
>  drivers/i2c/busses/i2c-tegra.c | 39 +++++++++++++++++++++++++--------------
>  1 file changed, 25 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
> index d764d64..6235f16 100644
> --- a/drivers/i2c/busses/i2c-tegra.c
> +++ b/drivers/i2c/busses/i2c-tegra.c
> @@ -423,12 +423,31 @@ static inline void tegra_i2c_clock_disable(struct tegra_i2c_dev *i2c_dev)
>  		clk_disable(i2c_dev->fast_clk);
>  }
>  
> +static int tegra_i2c_wait_for_config_load(struct tegra_i2c_dev *i2c_dev)
> +{
> +	unsigned long timeout;
> +
> +	if (i2c_dev->hw->has_config_load_reg) {
> +		i2c_writel(i2c_dev, I2C_MSTR_CONFIG_LOAD, I2C_CONFIG_LOAD);
> +		timeout = jiffies + msecs_to_jiffies(1000);
> +		while (i2c_readl(i2c_dev, I2C_CONFIG_LOAD) != 0) {
> +			if (time_after(jiffies, timeout)) {
> +				dev_warn(i2c_dev->dev,
> +					 "timeout waiting for config load\n");
> +				return -ETIMEDOUT;
> +			}
> +			msleep(1);
> +		}

How about using the readx_poll_timeout() (include/linux/iopoll.h) here?

Cheers
Jon