static int imx8m_ddrc_target()

in imx8m-ddrc.c [230:272]

• 33 lines of code
• 6 McCabe index (conditional complexity)

static int imx8m_ddrc_target(struct device *dev, unsigned long *freq, u32 flags)
{
	struct imx8m_ddrc *priv = dev_get_drvdata(dev);
	struct imx8m_ddrc_freq *freq_info;
	struct dev_pm_opp *new_opp;
	unsigned long old_freq, new_freq;
	int ret;

	new_opp = devfreq_recommended_opp(dev, freq, flags);
	if (IS_ERR(new_opp)) {
		ret = PTR_ERR(new_opp);
		dev_err(dev, "failed to get recommended opp: %d\n", ret);
		return ret;
	}
	dev_pm_opp_put(new_opp);

	old_freq = clk_get_rate(priv->dram_core);
	if (*freq == old_freq)
		return 0;

	freq_info = imx8m_ddrc_find_freq(priv, *freq);
	if (!freq_info)
		return -EINVAL;

	/*
	 * Read back the clk rate to verify switch was correct and so that
	 * we can report it on all error paths.
	 */
	ret = imx8m_ddrc_set_freq(dev, freq_info);

	new_freq = clk_get_rate(priv->dram_core);
	if (ret)
		dev_err(dev, "ddrc failed freq switch to %lu from %lu: error %d. now at %lu\n",
			*freq, old_freq, ret, new_freq);
	else if (*freq != new_freq)
		dev_err(dev, "ddrc failed freq update to %lu from %lu, now at %lu\n",
			*freq, old_freq, new_freq);
	else
		dev_dbg(dev, "ddrc freq set to %lu (was %lu)\n",
			*freq, old_freq);

	return ret;
}