linux-kernel - Re: [PATCH v2 3/4] drm/stm: dsi: expose DSI PHY internal clock

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Message-ID: <20231208165855.GA8459@kernel.org>
Date:   Fri, 8 Dec 2023 16:58:55 +0000
From:   Simon Horman <horms@...nel.org>
To:     Raphael Gallais-Pou <raphael.gallais-pou@...s.st.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Yannick Fertre <yannick.fertre@...s.st.com>,
        Philippe Cornu <philippe.cornu@...s.st.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Richard Cochran <richardcochran@...il.com>,
        devicetree@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, netdev@...r.kernel.org
Subject: Re: [PATCH v2 3/4] drm/stm: dsi: expose DSI PHY internal clock

On Mon, Dec 04, 2023 at 11:11:12AM +0100, Raphael Gallais-Pou wrote:

...

> @@ -514,18 +675,40 @@ static int dw_mipi_dsi_stm_probe(struct platform_device *pdev)
>  		dsi->lane_max_kbps *= 2;
>  	}
>  
> -	dw_mipi_dsi_stm_plat_data.base = dsi->base;
> -	dw_mipi_dsi_stm_plat_data.priv_data = dsi;
> +	dsi->pdata = *pdata;
> +	dsi->pdata.base = dsi->base;
> +	dsi->pdata.priv_data = dsi;
> +
> +	dsi->pdata.max_data_lanes = 2;
> +	dsi->pdata.phy_ops = &dw_mipi_dsi_stm_phy_ops;
>  
>  	platform_set_drvdata(pdev, dsi);
>  
> -	dsi->dsi = dw_mipi_dsi_probe(pdev, &dw_mipi_dsi_stm_plat_data);
> +	dsi->dsi = dw_mipi_dsi_probe(pdev, &dsi->pdata);
>  	if (IS_ERR(dsi->dsi)) {
>  		ret = PTR_ERR(dsi->dsi);
>  		dev_err_probe(dev, ret, "Failed to initialize mipi dsi host\n");
>  		goto err_dsi_probe;
>  	}
>  
> +	/*
> +	 * We need to wait for the generic bridge to probe before enabling and
> +	 * register the internal pixel clock.
> +	 */
> +	ret = clk_prepare_enable(dsi->pclk);
> +	if (ret) {
> +		DRM_ERROR("%s: Failed to enable peripheral clk\n", __func__);
> +		goto err_dsi_probe;
> +	}
> +
> +	ret = dw_mipi_dsi_clk_register(dsi, dev);
> +	if (ret) {
> +		DRM_ERROR("Failed to register DSI pixel clock: %d\n", ret);

Hi Raphael,

Does clk_disable_unprepare(dsi->pclk) need to be added to this unwind
chain?

Flagged by Smatch.

> +		goto err_dsi_probe;
> +	}
> +
> +	clk_disable_unprepare(dsi->pclk);
> +
>  	return 0;
>  
>  err_dsi_probe:

...