linux-kernel - Re: [PATCH v4 1/4] drm: rockchip: introduce rk3066 hdmi

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Message-ID: <3f6267ba-82a6-0c58-8a2b-ebce2cb5c650@gmail.com>
Date:   Thu, 28 Mar 2019 18:50:35 +0100
From:   Johan Jonker <jbx6244@...il.com>
To:     Heiko Stübner <heiko@...ech.de>
Cc:     hjc@...k-chips.com, airlied@...ux.ie, daniel@...ll.ch,
        robh+dt@...nel.org, mark.rutland@....com,
        dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 1/4] drm: rockchip: introduce rk3066 hdmi

Hi,

Question for Heiko cs. See below.
Let me know if there's a need for V6?

On 3/19/19 12:44 PM, Heiko Stübner wrote:

> Am Mittwoch, 6. März 2019, 23:41:10 CET schrieb Johan Jonker:

>> +static int rk3066_hdmi_connector_get_modes(struct drm_connector *connector)
>> +{
>> +	struct rk3066_hdmi *hdmi = to_rk3066_hdmi(connector);
>> +	struct edid *edid;
>> +	int ret = 0;
>> +

Is this OK or drop it?
	hdmi->hdmi_data.sink_is_hdmi = false;

>> +	if (!hdmi->ddc)
>> +		return 0;
>> +
>> +	edid = drm_get_edid(connector, hdmi->ddc);
>> +	if (edid) {
>> +		hdmi->hdmi_data.sink_is_hdmi = drm_detect_hdmi_monitor(edid);
>> +		drm_connector_update_edid_property(connector, edid);
>> +		ret = drm_add_edid_modes(connector, edid);
>> +		kfree(edid);
>> +	}
>> +

>> +
>> +	return ret;
>> +}



>> +static int rk3066_hdmi_bind(struct device *dev, struct device *master,
>> +			    void *data)
>> +{
>> +	struct platform_device *pdev = to_platform_device(dev);
>> +	struct drm_device *drm = data;
>> +	struct rk3066_hdmi *hdmi;
>> +	struct resource *iores;
>> +	int irq;
>> +	int ret;
>> +
>> +	hdmi = devm_kzalloc(dev, sizeof(*hdmi), GFP_KERNEL);
>> +	if (!hdmi)
>> +		return -ENOMEM;
>> +
>> +	hdmi->dev = dev;
>> +	hdmi->drm_dev = drm;
>> +
>> +	iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> +	if (!iores)
>> +		return -ENXIO;
>> +
>> +	hdmi->regs = devm_ioremap_resource(dev, iores);
>> +	if (IS_ERR(hdmi->regs))
>> +		return PTR_ERR(hdmi->regs);
>> +
>> +	irq = platform_get_irq(pdev, 0);
>> +	if (irq < 0)
>> +		return irq;
>> +
>> +	hdmi->hclk = devm_clk_get(dev, "hclk");
>> +	if (IS_ERR(hdmi->hclk)) {
>> +		dev_err(dev, "unable to get HDMI hclk clock\n");
>> +		return PTR_ERR(hdmi->hclk);
>> +	}
>> +
>> +	ret = clk_prepare_enable(hdmi->hclk);
>> +	if (ret) {
>> +		dev_err(dev, "cannot enable HDMI hclk clock: %d\n", ret);
>> +		return ret;
>> +	}
>> +
>> +	hdmi->grf = syscon_regmap_lookup_by_phandle(dev->of_node,
>> +						    "rockchip,grf");
>> +	if (IS_ERR(hdmi->grf)) {
>> +		dev_err(dev, "unable to get rockchip,grf\n");
>> +		ret = PTR_ERR(hdmi->grf);
>> +		goto err_disable_hclk;
>> +	}
>> +
>> +	/* internal hclk = hdmi_hclk / 25 */
>> +	hdmi_writeb(hdmi, HDMI_INTERNAL_CLK_DIVIDER, 25);
>> +
>> +	hdmi->ddc = rk3066_hdmi_i2c_adapter(hdmi);
>> +	if (IS_ERR(hdmi->ddc)) {
>> +		ret = PTR_ERR(hdmi->ddc);
>> +		hdmi->ddc = NULL;
>> +		goto err_disable_hclk;
>> +	}
>> +
>> +	rk3066_hdmi_set_power_mode(hdmi, HDMI_SYS_POWER_MODE_B);
>> +	usleep_range(999, 1000);
>> +	hdmi_writeb(hdmi, HDMI_INTR_MASK1, HDMI_INTR_HOTPLUG);
>> +	hdmi_writeb(hdmi, HDMI_INTR_MASK2, 0);
>> +	hdmi_writeb(hdmi, HDMI_INTR_MASK3, 0);
>> +	hdmi_writeb(hdmi, HDMI_INTR_MASK4, 0);
>> +	rk3066_hdmi_set_power_mode(hdmi, HDMI_SYS_POWER_MODE_A);
>> +

The function rk3066_hdmi_register() inits an encoder and connector.

>> +	ret = rk3066_hdmi_register(drm, hdmi);
>> +	if (ret)
>> +		goto err_disable_hclk;
> 
> goto err_disable_i2c;
> 
> So that the i2c-adapter also gets disabled on error.
> 
>> +	dev_set_drvdata(dev, hdmi);
>> +
>> +	ret = devm_request_threaded_irq(dev, irq, rk3066_hdmi_hardirq,
>> +					rk3066_hdmi_irq, IRQF_SHARED,
>> +					dev_name(dev), hdmi);
>> +	if (ret) {
>> +		dev_err(dev, "failed to request hdmi irq: %d\n", ret);
>> +		goto err_disable_hclk;
> 

If an error happens here the encoder and connector also have to be
removed like in the inno driver. Is that correct?
Change this to:

goto err_cleanup_hdmi;

> goto err_disable_i2c;
> 
>> +	}
>> +
>> +	return 0;
>> +
> 

What goto name would you like to have here?

err_cleanup_hdmi:
	hdmi->connector.funcs->destroy(&hdmi->connector);
	hdmi->encoder.funcs->destroy(&hdmi->encoder);

> err_disable_i2c:
> 	i2c_put_adapter(hdmi->ddc);
> 
>> +err_disable_hclk:
>> +	clk_disable_unprepare(hdmi->hclk);
>> +
>> +	return ret;
>> +}
>> +