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

On 12/8/23 17:58, Simon Horman wrote:

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

...

quoted

@@ -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,

Hi Simon,

You are right,  dsi->clk needs to be disabled in case the clock register fails
before exiting the probe.

I've sent a v3, which normally fixes it.


Regards,

Raphaël

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

Flagged by Smatch.

quoted

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

...