Re: [PATCH v8 02/12] [media] exynos5-fimc-is: Add driver core files

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On 09/12/2013 02:07 PM, Arun Kumar K wrote:

+static int fimc_is_probe(struct platform_device *pdev)
+{
+	struct device *dev =&pdev->dev;
+	struct resource *res;
+	struct fimc_is *is;
+	void __iomem *regs;
+	struct device_node *node;
+	int irq, ret;
+	int i;
+
+	dev_dbg(dev, "FIMC-IS Probe Enter\n");
+
+	if (!pdev->dev.of_node)

nit: Could be simplified to:

 	if (!dev->of_node)

+		return -ENODEV;
+
+	is = devm_kzalloc(&pdev->dev, sizeof(*is), GFP_KERNEL);
+	if (!is)
+		return -ENOMEM;
+
+	is->pdev = pdev;
+
+	is->drvdata = fimc_is_get_drvdata(pdev);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	regs = devm_ioremap_resource(dev, res);
+	if (IS_ERR(regs))
+		return PTR_ERR(regs);
+
+	/* Get the PMU base */
+	node = of_parse_phandle(dev->of_node, "samsung,pmu", 0);
+	if (!node)
+		return -ENODEV;
+	is->pmu_regs = of_iomap(node, 0);
+	if (!is->pmu_regs)
+		return -ENOMEM;
+
+	irq = irq_of_parse_and_map(dev->of_node, 0);
+	if (irq<  0) {
+		dev_err(dev, "Failed to get IRQ\n");
+		return irq;
+	}
+
+	ret = fimc_is_configure_clocks(is);
+	if (ret<  0) {
+		dev_err(dev, "clocks configuration failed\n");
+		goto err_clk;
+	}
+
+	platform_set_drvdata(pdev, is);
+	pm_runtime_enable(dev);
+
+	ret = pm_runtime_get_sync(dev);
+	if (ret<  0)
+		goto err_pm;

Is activating the device at this point really needed ? Perhaps you
could drop the pm_runtime_get/put calls ?

+	is->alloc_ctx = vb2_dma_contig_init_ctx(dev);
+	if (IS_ERR(is->alloc_ctx)) {
+		ret = PTR_ERR(is->alloc_ctx);
+		goto err_vb;
+	}
+
+	/* Get IS-sensor contexts */
+	ret = fimc_is_parse_sensor(is);
+	if (ret<  0)
+		goto err_vb;
+
+	/* Initialize FIMC Pipeline */
+	for (i = 0; i<  is->drvdata->num_instances; i++) {
+		ret = fimc_is_pipeline_init(&is->pipeline[i], i, is);
+		if (ret<  0)
+			goto err_sd;
+	}
+
+	/* Initialize FIMC Interface */
+	ret = fimc_is_interface_init(&is->interface, regs, irq);
+	if (ret<  0)
+		goto err_sd;
+
+	pm_runtime_put(dev);
+
+	dev_dbg(dev, "FIMC-IS registered successfully\n");
+
+	return 0;
+
+err_sd:
+	fimc_is_pipelines_destroy(is);
+err_vb:
+	vb2_dma_contig_cleanup_ctx(is->alloc_ctx);
+err_pm:
+	pm_runtime_put(dev);
+err_clk:
+	fimc_is_put_clocks(is);
+
+	return ret;
+}
+
+int fimc_is_clk_enable(struct fimc_is *is)
+{
+	int ret;
+
+	ret = clk_enable(is->clock[IS_CLK_ISP]);
+	if (ret)
+		return ret;
+	ret = clk_enable(is->clock[IS_CLK_MCU_ISP]);

Shouldn't you disable the first enabled clock when this call fails ?

+	return ret;
+}
[...]
+static void *fimc_is_get_drvdata(struct platform_device *pdev)
+{
+	struct fimc_is_drvdata *driver_data = NULL;
+
+	if (pdev->dev.of_node) {

pdev->dev.of_node is being tested against NULL before call to this
function, you could make this code slightly simpler with that assumption.

+		const struct of_device_id *match;
+		match = of_match_node(exynos5_fimc_is_match,
+				pdev->dev.of_node);
+		if (match)
+			driver_data = (struct fimc_is_drvdata *)match->data;
+	}
+	return driver_data;
+}

--
Thanks,
Sylwester
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