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

From: Simon Horman <horms@kernel.org>
To: Raphael Gallais-Pou <raphael.gallais-pou@foss.st.com>
Cc: Rob Herring <robh+dt@kernel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
	Conor Dooley <conor+dt@kernel.org>,
	Maxime Coquelin <mcoquelin.stm32@gmail.com>,
	Alexandre Torgue <alexandre.torgue@foss.st.com>,
	Yannick Fertre <yannick.fertre@foss.st.com>,
	Philippe Cornu <philippe.cornu@foss.st.com>,
	Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
	Maxime Ripard <mripard@kernel.org>,
	Thomas Zimmermann <tzimmermann@suse.de>,
	David Airlie <airlied@gmail.com>, Daniel Vetter <daniel@ffwll.ch>,
	Richard Cochran <richardcochran@gmail.com>,
	devicetree@vger.kernel.org,
	linux-stm32@st-md-mailman.stormreply.com,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org,
	netdev@vger.kernel.org
Subject: Re: [PATCH v2 3/4] drm/stm: dsi: expose DSI PHY internal clock
Date: Fri, 8 Dec 2023 16:58:55 +0000	[thread overview]
Message-ID: <20231208165855.GA8459@kernel.org> (raw)
In-Reply-To: <20231204101113.276368-4-raphael.gallais-pou@foss.st.com>

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:

...

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