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Message-ID: <18fd9544-f9ef-4f58-9a8a-026737c26b94@baylibre.com>
Date: Fri, 7 Feb 2025 15:45:59 +0100
From: Alexandre Mergnat <amergnat@...libre.com>
To: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
chunkuang.hu@...nel.org
Cc: p.zabel@...gutronix.de, airlied@...il.com, simona@...ll.ch,
maarten.lankhorst@...ux.intel.com, mripard@...nel.org, tzimmermann@...e.de,
robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org,
matthias.bgg@...il.com, ck.hu@...iatek.com, jitao.shi@...iatek.com,
jie.qiu@...iatek.com, junzhi.zhao@...iatek.com,
dri-devel@...ts.freedesktop.org, linux-mediatek@...ts.infradead.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, kernel@...labora.com,
dmitry.baryshkov@...aro.org, lewis.liao@...iatek.com,
ives.chenjh@...iatek.com, tommyyl.chen@...iatek.com,
jason-jh.lin@...iatek.com
Subject: Re: [PATCH v5 21/34] drm/mediatek: mtk_hdmi: Move CEC device parsing
in new function
On 13/01/2025 15:52, AngeloGioacchino Del Regno wrote:
> Move the CEC device parsing logic to a new function called
> mtk_hdmi_get_cec_dev(), and move the parsing action to the end
> of mtk_hdmi_dt_parse_pdata(), allowing to remove gotos in this
> function, reducing code size and improving readability.
Why CEC device parsing logic isn't done mtk_cec.c driver ? Then add "mtk_cec_get_dev" function to
mtk_cec.c too. Finally, call this new function in mtk_hdmi_probe after mtk_hdmi_dt_parse_pdata().
>
> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
> ---
> drivers/gpu/drm/mediatek/mtk_hdmi.c | 84 ++++++++++++++---------------
> 1 file changed, 40 insertions(+), 44 deletions(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi.c b/drivers/gpu/drm/mediatek/mtk_hdmi.c
> index 48c37294dcbb..eb285ec394a3 100644
> --- a/drivers/gpu/drm/mediatek/mtk_hdmi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_hdmi.c
> @@ -1367,24 +1367,16 @@ static const struct drm_bridge_funcs mtk_hdmi_bridge_funcs = {
> .edid_read = mtk_hdmi_bridge_edid_read,
> };
>
> -static int mtk_hdmi_dt_parse_pdata(struct mtk_hdmi *hdmi,
> - struct platform_device *pdev)
> +static int mtk_hdmi_get_cec_dev(struct mtk_hdmi *hdmi, struct device *dev, struct device_node *np)
> {
> - struct device *dev = &pdev->dev;
> - struct device_node *np = dev->of_node;
> - struct device_node *remote, *i2c_np;
> struct platform_device *cec_pdev;
> - struct regmap *regmap;
> + struct device_node *cec_np;
> int ret;
>
> - ret = mtk_hdmi_get_all_clk(hdmi, np);
> - if (ret)
> - return dev_err_probe(dev, ret, "Failed to get clocks\n");
> -
> /* The CEC module handles HDMI hotplug detection */
> cec_np = of_get_compatible_child(np->parent, "mediatek,mt8173-cec");
If it's done in mtk_cec.c, the hardcoded compatible string method will be replaced by of_match_table
(mtk_cec_of_ids), which is scalable and consistent.
> if (!cec_np)
> - return dev_err_probe(dev, -EINVAL, "Failed to find CEC node\n");
> + return dev_err_probe(dev, -ENOTSUPP, "Failed to find CEC node\n");
>
> cec_pdev = of_find_device_by_node(cec_np);
> if (!cec_pdev) {
> @@ -1393,65 +1385,69 @@ static int mtk_hdmi_dt_parse_pdata(struct mtk_hdmi *hdmi,
> return -EPROBE_DEFER;
> }
> of_node_put(cec_np);
> - hdmi->cec_dev = &cec_pdev->dev;
>
> /*
> * The mediatek,syscon-hdmi property contains a phandle link to the
> * MMSYS_CONFIG device and the register offset of the HDMI_SYS_CFG
> * registers it contains.
> */
> - regmap = syscon_regmap_lookup_by_phandle(np, "mediatek,syscon-hdmi");
> - ret = of_property_read_u32_index(np, "mediatek,syscon-hdmi", 1,
> - &hdmi->sys_offset);
> - if (IS_ERR(regmap))
> - ret = PTR_ERR(regmap);
> - if (ret) {
> - dev_err_probe(dev, ret,
> - "Failed to get system configuration registers\n");
> - goto put_device;
> - }
> - hdmi->sys_regmap = regmap;
> + hdmi->sys_regmap = syscon_regmap_lookup_by_phandle(np, "mediatek,syscon-hdmi");
> + if (IS_ERR(hdmi->sys_regmap))
> + return PTR_ERR(hdmi->sys_regmap);
> +
> + ret = of_property_read_u32_index(np, "mediatek,syscon-hdmi", 1, &hdmi->sys_offset);
> + if (ret)
> + return dev_err_probe(dev, ret,
> + "Failed to get system configuration registers\n");
> +
> + hdmi->cec_dev = &cec_pdev->dev;
> + return 0;
> +}
> +
> +static int mtk_hdmi_dt_parse_pdata(struct mtk_hdmi *hdmi,
> + struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct device_node *np = dev->of_node;
> + struct device_node *remote, *i2c_np;
> + int ret;
> +
> + ret = mtk_hdmi_get_all_clk(hdmi, np);
> + if (ret)
> + return dev_err_probe(dev, ret, "Failed to get clocks\n");
>
> hdmi->regs = device_node_to_regmap(dev->of_node);
> - if (IS_ERR(hdmi->regs)) {
> - ret = PTR_ERR(hdmi->regs);
> - goto put_device;
> - }
> + if (IS_ERR(hdmi->regs))
> + return PTR_ERR(hdmi->regs);
>
> remote = of_graph_get_remote_node(np, 1, 0);
> - if (!remote) {
> - ret = -EINVAL;
> - goto put_device;
> - }
> + if (!remote)
> + return -EINVAL;
>
> if (!of_device_is_compatible(remote, "hdmi-connector")) {
> hdmi->next_bridge = of_drm_find_bridge(remote);
> if (!hdmi->next_bridge) {
> dev_err(dev, "Waiting for external bridge\n");
> of_node_put(remote);
> - ret = -EPROBE_DEFER;
> - goto put_device;
> + return -EPROBE_DEFER;
> }
> }
>
> i2c_np = of_parse_phandle(remote, "ddc-i2c-bus", 0);
> of_node_put(remote);
> - if (!i2c_np) {
> - ret = dev_err_probe(dev, -EINVAL, "No ddc-i2c-bus in connector\n");
> - goto put_device;
> - }
> + if (!i2c_np)
> + return dev_err_probe(dev, -EINVAL, "No ddc-i2c-bus in connector\n");
>
> hdmi->ddc_adpt = of_find_i2c_adapter_by_node(i2c_np);
> of_node_put(i2c_np);
> - if (!hdmi->ddc_adpt) {
> - ret = dev_err_probe(dev, -EINVAL, "Failed to get ddc i2c adapter by node\n");
> - goto put_device;
> - }
> + if (!hdmi->ddc_adpt)
> + return dev_err_probe(dev, -EINVAL, "Failed to get ddc i2c adapter by node\n");
> +
> + ret = mtk_hdmi_get_cec_dev(hdmi, dev, np);
> + if (ret)
> + return ret;
>
> return 0;
> -put_device:
> - put_device(hdmi->cec_dev);
> - return ret;
> }
>
> /*
--
Regards,
Alexandre
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