linux-kernel - Re: [PATCH v17 14/21] drm/mediatek: add ETHDR support for MT8195

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Message-ID: <0e642da615b8f52fb36cd1248f8a124ea4e4b7b8.camel@pengutronix.de>
Date:   Mon, 25 Apr 2022 12:00:13 +0200
From:   Philipp Zabel <p.zabel@...gutronix.de>
To:     "Nancy.Lin" <nancy.lin@...iatek.com>,
        Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        wim@...ux-watchdog.org,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>, linux@...ck-us.net
Cc:     David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        "jason-jh . lin" <jason-jh.lin@...iatek.com>,
        Yongqiang Niu <yongqiang.niu@...iatek.com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org,
        dri-devel@...ts.freedesktop.org, llvm@...ts.linux.dev,
        singo.chang@...iatek.com, srv_heupstream@...iatek.com,
        Project_Global_Chrome_Upstream_Group@...iatek.com
Subject: Re: [PATCH v17 14/21] drm/mediatek: add ETHDR support for MT8195

On Sa, 2022-04-16 at 10:07 +0800, Nancy.Lin wrote:
> ETHDR is a part of ovl_adaptor.
> ETHDR is designed for HDR video and graphics conversion in the external
> display path. It handles multiple HDR input types and performs tone
> mapping, color space/color format conversion, and then combine
> different layers, output the required HDR or SDR signal to the
> subsequent display path.
> 
> Signed-off-by: Nancy.Lin <nancy.lin@...iatek.com>
> Reviewed-by: Chun-Kuang Hu <chunkuang.hu@...nel.org>
> Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
> ---
[...]
> +static int mtk_ethdr_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct mtk_ethdr *priv;
> +	int ret;
> +	int i;
> +
> +	dev_info(dev, "%s+\n", __func__);

Left-over debug statements?

> +
> +	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> +	if (!priv)
> +		return -ENOMEM;
> +
> +	for (i = 0; i < ETHDR_ID_MAX; i++) {
> +		priv->ethdr_comp[i].dev = dev;
> +		priv->ethdr_comp[i].regs = of_iomap(dev->of_node, i);
> +#if IS_REACHABLE(CONFIG_MTK_CMDQ)
> +		ret = cmdq_dev_get_client_reg(dev,
> +					      &priv->ethdr_comp[i].cmdq_base, i);
> +		if (ret)
> +			dev_dbg(dev, "get mediatek,gce-client-reg fail!\n");
> +#endif
> +		dev_dbg(dev, "[DRM]regs:0x%p, node:%d\n", priv->ethdr_comp[i].regs, i);
> +	}
> +
> +	for (i = 0; i < ETHDR_CLK_NUM; i++)
> +		priv->ethdr_clk[i].id = ethdr_clk_str[i];
> +	ret = devm_clk_bulk_get_optional(dev, ETHDR_CLK_NUM, priv->ethdr_clk);
> +	if (ret)
> +		return ret;
> +
> +	priv->irq = platform_get_irq(pdev, 0);
> +	if (priv->irq < 0)
> +		priv->irq = 0;
> +
> +	if (priv->irq) {
> +		ret = devm_request_irq(dev, priv->irq, mtk_ethdr_irq_handler,
> +				       IRQF_TRIGGER_NONE, dev_name(dev), priv);
> +		if (ret < 0) {
> +			dev_err(dev, "Failed to request irq %d: %d\n", priv->irq, ret);
> +			return ret;
> +		}
> +	}
> +
> +	priv->reset_ctl = devm_reset_control_array_get_optional_exclusive(dev);

This is missing error handling. You could use dev_err_probe() here.

regards
Philipp