linux-kernel - Re: [PATCH v2 2/2] drm: panel: add Khadas TS050 panel driver

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Message-ID: <20201205191502.GB332836@ravnborg.org>
Date:   Sat, 5 Dec 2020 20:15:02 +0100
From:   Sam Ravnborg <sam@...nborg.org>
To:     Neil Armstrong <narmstrong@...libre.com>
Cc:     linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH v2 2/2] drm: panel: add Khadas TS050 panel driver

Hi Neil,

> +
> +static int khadas_ts050_panel_probe(struct mipi_dsi_device *dsi)
> +{
> +	struct khadas_ts050_panel *khadas_ts050;
> +	int err;
> +
> +	dsi->lanes = 4;
> +	dsi->format = MIPI_DSI_FMT_RGB888;
> +	dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST |
> +			  MIPI_DSI_MODE_LPM | MIPI_DSI_MODE_EOT_PACKET;
> +
> +	khadas_ts050 = devm_kzalloc(&dsi->dev, sizeof(*khadas_ts050),
> +				    GFP_KERNEL);
> +	if (!khadas_ts050)
> +		return -ENOMEM;
> +
> +	mipi_dsi_set_drvdata(dsi, khadas_ts050);
> +	khadas_ts050->link = dsi;
> +
> +	err = khadas_ts050_panel_add(khadas_ts050);
> +	if (err < 0)
> +		return err;
> +
> +	return mipi_dsi_attach(dsi);
> +}

If mipi_dsi_attach() failes then da a drm_panel_remove() like this:

	ret = mipi_dsi_attach(dsi);
	if (ret)
		drm_panel_remove(&khadas_ts050->base);

	return ret;

This is again something several panels gets wrong.

With this fixed:
Reviewed-by: Sam Ravnborg <sam@...nborg.org>

I assume you will fix it while applying.

	Sam