Re: [PATCH v3 11/14] media: platform: Add Sunxi-Cedrus VPU decoder driver

[Maxime Ripard]

On Mon, May 07, 2018 at 02:44:57PM +0200, Paul Kocialkowski wrote:
> +#define SYSCON_SRAM_CTRL_REG0	0x0
> +#define SYSCON_SRAM_C1_MAP_VE	0x7fffffff

This isn't needed anymore

> +	dev->ahb_clk = devm_clk_get(dev->dev, "ahb");
> +	if (IS_ERR(dev->ahb_clk)) {
> +		dev_err(dev->dev, "failed to get ahb clock\n");
> +		return PTR_ERR(dev->ahb_clk);
> +	}
> +	dev->mod_clk = devm_clk_get(dev->dev, "mod");
> +	if (IS_ERR(dev->mod_clk)) {
> +		dev_err(dev->dev, "failed to get mod clock\n");
> +		return PTR_ERR(dev->mod_clk);
> +	}
> +	dev->ram_clk = devm_clk_get(dev->dev, "ram");
> +	if (IS_ERR(dev->ram_clk)) {
> +		dev_err(dev->dev, "failed to get ram clock\n");
> +		return PTR_ERR(dev->ram_clk);
> +	}

Please add some blank lines between those blocks

> +	dev->rstc = devm_reset_control_get(dev->dev, NULL);

You're not checking the error code here

> +	dev->syscon = syscon_regmap_lookup_by_phandle(dev->dev->of_node,
> +						      "syscon");
> +	if (IS_ERR(dev->syscon)) {
> +		dev->syscon = NULL;
> +	} else {
> +		regmap_write_bits(dev->syscon, SYSCON_SRAM_CTRL_REG0,
> +				  SYSCON_SRAM_C1_MAP_VE,
> +				  SYSCON_SRAM_C1_MAP_VE);
> +	}

You don't need the syscon part anymore either

> +	ret = clk_prepare_enable(dev->ahb_clk);
> +	if (ret) {
> +		dev_err(dev->dev, "could not enable ahb clock\n");
> +		return -EFAULT;
> +	}
> +	ret = clk_prepare_enable(dev->mod_clk);
> +	if (ret) {
> +		clk_disable_unprepare(dev->ahb_clk);
> +		dev_err(dev->dev, "could not enable mod clock\n");
> +		return -EFAULT;
> +	}
> +	ret = clk_prepare_enable(dev->ram_clk);
> +	if (ret) {
> +		clk_disable_unprepare(dev->mod_clk);
> +		clk_disable_unprepare(dev->ahb_clk);
> +		dev_err(dev->dev, "could not enable ram clock\n");
> +		return -EFAULT;
> +	}
> +
> +	ret = reset_control_reset(dev->rstc);
> +	if (ret) {
> +		clk_disable_unprepare(dev->ram_clk);
> +		clk_disable_unprepare(dev->mod_clk);
> +		clk_disable_unprepare(dev->ahb_clk);
> +		dev_err(dev->dev, "could not reset device\n");
> +		return -EFAULT;

labels would simplify this greatly, and you should also release the
sram and the memory region here.

Maxime

-- 
Maxime Ripard, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com