linux-kernel - Re: [PATCH v5 4/5] drm: imx: Add i.MX 6 MIPI DSI host platform driver

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Date:   Mon, 30 Mar 2020 08:49:19 -0300
From:   Fabio Estevam <festevam@...il.com>
To:     Adrian Ratiu <adrian.ratiu@...labora.com>
Cc:     "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        linux-stm32@...md-mailman.stormreply.com,
        linux-rockchip@...ts.infradead.org,
        DRI mailing list <dri-devel@...ts.freedesktop.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        NXP Linux Team <linux-imx@....com>, kernel@...labora.com,
        Andrzej Hajda <a.hajda@...sung.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Emil Velikov <emil.velikov@...labora.com>,
        Sjoerd Simons <sjoerd.simons@...labora.com>,
        Martyn Welch <martyn.welch@...labora.com>
Subject: Re: [PATCH v5 4/5] drm: imx: Add i.MX 6 MIPI DSI host platform driver

Hi Adrian,

On Mon, Mar 30, 2020 at 8:34 AM Adrian Ratiu <adrian.ratiu@...labora.com> wrote:
>
> This adds support for the Synopsis DesignWare MIPI DSI v1.01 host
> controller which is embedded in i.MX 6 SoCs.
>
> Based on following patches, but updated/extended to work with existing
> support found in the kernel:
>
> - drm: imx: Support Synopsys DesignWare MIPI DSI host controller
>   Signed-off-by: Liu Ying <Ying.Liu@...escale.com>
>
> - ARM: dtsi: imx6qdl: Add support for MIPI DSI host controller
>   Signed-off-by: Liu Ying <Ying.Liu@...escale.com>

This one looks like a devicetree patch, but this patch does not touch
devicetree.

> +       ret = clk_prepare_enable(dsi->pllref_clk);
> +       if (ret) {
> +               dev_err(dev, "%s: Failed to enable pllref_clk\n", __func__);
> +               return ret;
> +       }
> +
> +       dsi->mux_sel = syscon_regmap_lookup_by_phandle(dev->of_node, "fsl,gpr");
> +       if (IS_ERR(dsi->mux_sel)) {
> +               ret = PTR_ERR(dsi->mux_sel);
> +               dev_err(dev, "%s: Failed to get GPR regmap: %d\n",
> +                       __func__, ret);
> +               return ret;

You should disable the dsi->pllref_clk clock prior to returning the error.

> +       dsi->mipi_dsi = dw_mipi_dsi_probe(pdev, pdata);
> +       if (IS_ERR(dsi->mipi_dsi)) {
> +               ret = PTR_ERR(dsi->mipi_dsi);
> +               dev_dbg(dev, "%s: Unable to probe DW DSI host device: %d\n",
> +                       __func__, ret);
> +               return -ENODEV;

Same here. You should disable the clock. Shouldn't you return 'ret'
here instead of -ENODEV?

> +module_platform_driver(imx_mipi_dsi_driver);
> +
> +MODULE_DESCRIPTION("i.MX6 MIPI DSI host controller driver");
> +MODULE_AUTHOR("Liu Ying <Ying.Liu@...escale.com>");

The freescale.com domain is no longer functional.

Ying Liu's NXP address is victor.liu@....com. You could probably add
your entry as well.