linux-kernel - Re: [RFC PATCH v2 14/18] gpu: host1x: mipi: Split tegra_mipi_calibrate and tegra_mipi

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Date:   Thu, 18 Jun 2020 03:35:20 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Sowjanya Komatineni <skomatineni@...dia.com>,
        thierry.reding@...il.com, jonathanh@...dia.com, frankc@...dia.com,
        hverkuil@...all.nl, sakari.ailus@....fi, robh+dt@...nel.org,
        helen.koike@...labora.com
Cc:     sboyd@...nel.org, gregkh@...uxfoundation.org,
        linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-i2c@...r.kernel.org
Subject: Re: [RFC PATCH v2 14/18] gpu: host1x: mipi: Split
 tegra_mipi_calibrate and tegra_mipi_wait

17.06.2020 04:41, Sowjanya Komatineni пишет:
...
> -static int tegra_mipi_wait(struct tegra_mipi *mipi)
> +int tegra_mipi_wait(struct tegra_mipi_device *device)
>  {
> +	struct tegra_mipi *mipi = device->mipi;
>  	unsigned long timeout = jiffies + msecs_to_jiffies(250);
>  	u32 value;
> +	int err;
> +
> +	err = clk_enable(device->mipi->clk);
> +	if (err < 0)
> +		return err;
> +
> +	mutex_lock(&device->mipi->lock);

The timeout variable should be assigned *after* taking the lock.

It will be better if you could use the read_poll_timeout() or
readl_relaxed_poll_timeout() here.

>  	while (time_before(jiffies, timeout)) {
>  		value = tegra_mipi_readl(mipi, MIPI_CAL_STATUS);
>  		if ((value & MIPI_CAL_STATUS_ACTIVE) == 0 &&
>  		    (value & MIPI_CAL_STATUS_DONE) != 0)
> -			return 0;
> +			goto done;
>  
>  		usleep_range(10, 50);
>  	}
>  
> -	return -ETIMEDOUT;
> +	err = -ETIMEDOUT;
> +done:
> +	mutex_unlock(&device->mipi->lock);
> +	clk_disable(device->mipi->clk);
> +	return err;
>  }
> +EXPORT_SYMBOL(tegra_mipi_wait);