drm/panel: st7701: Decouple DSI and DRM parts

Split into a DSI-specific part and a DRM-specific part.

Additionally, use devm_add_action_or_reset() to simplify the flow,
and disable and unprepare the panel on cleanup.
Signed-off-by: Hironori KIKUCHI <kikuchan98@gmail.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Reviewed-by: Jessica Zhang <quic_jesszhan@quicinc.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20240804061503.881283-3-kikuchan98@gmail.comSigned-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240804061503.881283-3-kikuchan98@gmail.com

drivers/gpu/drm/panel/panel-sitronix-st7701.c

@@ -539,7 +539,7 @@ static int st7701_get_modes(struct drm_panel *panel,
 
 	mode = drm_mode_duplicate(connector->dev, desc_mode);
 	if (!mode) {
-		dev_err(&st7701->dsi->dev, "failed to add mode %ux%u@%u\n",
+		dev_err(panel->dev, "failed to add mode %ux%u@%u\n",
 			desc_mode->hdisplay, desc_mode->vdisplay,
 			drm_mode_vrefresh(desc_mode));
 		return -ENOMEM;
@@ -974,42 +974,48 @@ static const struct st7701_panel_desc rg_arc_desc = {
 	.gip_sequence = rg_arc_gip_sequence,
 };
 
-static int st7701_dsi_probe(struct mipi_dsi_device *dsi)
+static void st7701_cleanup(void *data)
+{
+	struct st7701 *st7701 = (struct st7701 *)data;
+
+	drm_panel_remove(&st7701->panel);
+	drm_panel_disable(&st7701->panel);
+	drm_panel_unprepare(&st7701->panel);
+}
+
+static int st7701_probe(struct device *dev, int connector_type)
 {
 	const struct st7701_panel_desc *desc;
 	struct st7701 *st7701;
 	int ret;
 
-	st7701 = devm_kzalloc(&dsi->dev, sizeof(*st7701), GFP_KERNEL);
+	st7701 = devm_kzalloc(dev, sizeof(*st7701), GFP_KERNEL);
 	if (!st7701)
 		return -ENOMEM;
 
-	desc = of_device_get_match_data(&dsi->dev);
-	dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST |
-			  MIPI_DSI_MODE_LPM | MIPI_DSI_CLOCK_NON_CONTINUOUS;
-	dsi->format = desc->format;
-	dsi->lanes = desc->lanes;
+	desc = of_device_get_match_data(dev);
+	if (!desc)
+		return -ENODEV;
 
 	st7701->supplies[0].supply = "VCC";
 	st7701->supplies[1].supply = "IOVCC";
 
-	ret = devm_regulator_bulk_get(&dsi->dev, ARRAY_SIZE(st7701->supplies),
+	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(st7701->supplies),
 				      st7701->supplies);
 	if (ret < 0)
 		return ret;
 
-	st7701->reset = devm_gpiod_get(&dsi->dev, "reset", GPIOD_OUT_LOW);
+	st7701->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
 	if (IS_ERR(st7701->reset)) {
-		dev_err(&dsi->dev, "Couldn't get our reset GPIO\n");
+		dev_err(dev, "Couldn't get our reset GPIO\n");
 		return PTR_ERR(st7701->reset);
 	}
 
-	ret = of_drm_get_panel_orientation(dsi->dev.of_node, &st7701->orientation);
+	ret = of_drm_get_panel_orientation(dev->of_node, &st7701->orientation);
 	if (ret < 0)
-		return dev_err_probe(&dsi->dev, ret, "Failed to get orientation\n");
+		return dev_err_probe(dev, ret, "Failed to get orientation\n");
 
-	drm_panel_init(&st7701->panel, &dsi->dev, &st7701_funcs,
-		       DRM_MODE_CONNECTOR_DSI);
+	drm_panel_init(&st7701->panel, dev, &st7701_funcs, connector_type);
 
 	/**
 	 * Once sleep out has been issued, ST7701 IC required to wait 120ms
@@ -1028,27 +1034,39 @@ static int st7701_dsi_probe(struct mipi_dsi_device *dsi)
 
 	drm_panel_add(&st7701->panel);
 
-	mipi_dsi_set_drvdata(dsi, st7701);
-	st7701->dsi = dsi;
+	dev_set_drvdata(dev, st7701);
 	st7701->desc = desc;
 
-	ret = mipi_dsi_attach(dsi);
-	if (ret)
-		goto err_attach;
+	return devm_add_action_or_reset(dev, st7701_cleanup, st7701);
+}
 
-	return 0;
+static int st7701_dsi_probe(struct mipi_dsi_device *dsi)
+{
+	struct st7701 *st7701;
+	int err;
 
-err_attach:
-	drm_panel_remove(&st7701->panel);
-	return ret;
+	err = st7701_probe(&dsi->dev, DRM_MODE_CONNECTOR_DSI);
+	if (err)
+		return err;
+
+	st7701 = dev_get_drvdata(&dsi->dev);
+	st7701->dsi = dsi;
+
+	dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST |
+			  MIPI_DSI_MODE_LPM | MIPI_DSI_CLOCK_NON_CONTINUOUS;
+	dsi->format = st7701->desc->format;
+	dsi->lanes = st7701->desc->lanes;
+
+	err = mipi_dsi_attach(dsi);
+	if (err)
+		return dev_err_probe(&dsi->dev, err, "Failed to init MIPI DSI\n");
+
+	return 0;
 }
 
 static void st7701_dsi_remove(struct mipi_dsi_device *dsi)
 {
-	struct st7701 *st7701 = mipi_dsi_get_drvdata(dsi);
-
 	mipi_dsi_detach(dsi);
-	drm_panel_remove(&st7701->panel);
 }
 
 static const struct of_device_id st7701_of_match[] = {