drm/omap: dsi: Reverse direction of the DSS device enable/disable operations

Complete the direction reversal of the DSS device enable/disable
operations started by commit 19b4200d ("drm/omap: Reverse direction
of the DSS device enable/disable operations").

This effectively drops the requirement of calling DSS specific
code from the DSI panel driver moving it a bit further to a
standard drm_panel driver.
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20201215104657.802264-31-tomi.valkeinen@ti.com

drivers/gpu/drm/omapdrm/displays/panel-dsi-cm.c

@@ -284,27 +284,6 @@ static int dsicm_power_on(struct panel_drv_data *ddata)
 	struct omap_dss_device *src = ddata->src;
 	u8 id1, id2, id3;
 	int r;
-	struct omap_dss_dsi_config dsi_config = {
-		.vm = &ddata->vm,
-		.hs_clk_min = 150000000,
-		.hs_clk_max = 300000000,
-		.lp_clk_min = 7000000,
-		.lp_clk_max = 10000000,
-	};
-
-	r = regulator_bulk_enable(ARRAY_SIZE(ddata->supplies), ddata->supplies);
-	if (r) {
-		dev_err(&ddata->dsi->dev, "failed to enable supplies: %d\n", r);
-		return r;
-	}
-
-	r = src->ops->dsi.set_config(src, &dsi_config);
-	if (r) {
-		dev_err(&ddata->dsi->dev, "failed to configure DSI\n");
-		goto err_regulators;
-	}
-
-	src->ops->enable(src);
 
 	dsicm_hw_reset(ddata);
 
@@ -359,12 +338,6 @@ static int dsicm_power_on(struct panel_drv_data *ddata)
 
 	dsicm_hw_reset(ddata);
 
-	src->ops->disable(src);
-err_regulators:
-	r = regulator_bulk_disable(ARRAY_SIZE(ddata->supplies), ddata->supplies);
-	if (r)
-		dev_err(&ddata->dsi->dev, "failed to disable supplies: %d\n", r);
-
 	return r;
 }
 
@@ -373,6 +346,8 @@ static void dsicm_power_off(struct panel_drv_data *ddata)
 	struct omap_dss_device *src = ddata->src;
 	int r;
 
+	ddata->enabled = false;
+
 	src->ops->dsi.disable_video_output(src, ddata->dsi->channel);
 
 	r = mipi_dsi_dcs_set_display_off(ddata->dsi);
@@ -384,14 +359,6 @@ static void dsicm_power_off(struct panel_drv_data *ddata)
 				"error disabling panel, issuing HW reset\n");
 		dsicm_hw_reset(ddata);
 	}
-
-	src->ops->disable(src);
-
-	r = regulator_bulk_disable(ARRAY_SIZE(ddata->supplies), ddata->supplies);
-	if (r)
-		dev_err(&ddata->dsi->dev, "failed to disable supplies: %d\n", r);
-
-	ddata->enabled = false;
 }
 
 static int dsicm_connect(struct omap_dss_device *src,
@@ -411,6 +378,29 @@ static void dsicm_disconnect(struct omap_dss_device *src,
 	ddata->src = NULL;
 }
 
+static void dsicm_pre_enable(struct omap_dss_device *dssdev)
+{
+	struct panel_drv_data *ddata = to_panel_data(dssdev);
+	struct omap_dss_device *src = ddata->src;
+	int r;
+	struct omap_dss_dsi_config dsi_config = {
+		.vm = &ddata->vm,
+		.hs_clk_min = 150000000,
+		.hs_clk_max = 300000000,
+		.lp_clk_min = 7000000,
+		.lp_clk_max = 10000000,
+	};
+
+	r = regulator_bulk_enable(ARRAY_SIZE(ddata->supplies), ddata->supplies);
+	if (r)
+		dev_err(&ddata->dsi->dev, "failed to enable supplies: %d\n", r);
+
+	r = src->ops->dsi.set_config(src, &dsi_config);
+	if (r) {
+		dev_err(&ddata->dsi->dev, "failed to configure DSI\n");
+	}
+}
+
 static void dsicm_enable(struct omap_dss_device *dssdev)
 {
 	struct panel_drv_data *ddata = to_panel_data(dssdev);
@@ -445,6 +435,16 @@ static void dsicm_disable(struct omap_dss_device *dssdev)
 	mutex_unlock(&ddata->lock);
 }
 
+static void dsicm_post_disable(struct omap_dss_device *dssdev)
+{
+	struct panel_drv_data *ddata = to_panel_data(dssdev);
+	int r;
+
+	r = regulator_bulk_disable(ARRAY_SIZE(ddata->supplies), ddata->supplies);
+	if (r)
+		dev_err(&ddata->dsi->dev, "failed to disable supplies: %d\n", r);
+}
+
 static int _dsicm_enable_te(struct panel_drv_data *ddata, bool enable)
 {
 	struct mipi_dsi_device *dsi = ddata->dsi;
@@ -498,8 +498,10 @@ static const struct omap_dss_device_ops dsicm_ops = {
 	.connect	= dsicm_connect,
 	.disconnect	= dsicm_disconnect,
 
+	.pre_enable	= dsicm_pre_enable,
 	.enable		= dsicm_enable,
 	.disable	= dsicm_disable,
+	.post_disable	= dsicm_post_disable,
 
 	.get_modes	= dsicm_get_modes,
 	.check_timings	= dsicm_check_timings,
@@ -655,8 +657,6 @@ static int __exit dsicm_remove(struct mipi_dsi_device *dsi)
 
 	omapdss_device_unregister(dssdev);
 
-	if (omapdss_device_is_enabled(dssdev))
-		dsicm_disable(dssdev);
 	omapdss_device_disconnect(ddata->src, dssdev);
 
 	sysfs_remove_group(&dsi->dev.kobj, &dsicm_attr_group);

drivers/gpu/drm/omapdrm/omap_encoder.c

@@ -136,16 +136,10 @@ static void omap_encoder_disable(struct drm_encoder *encoder)
 	 */
 	omapdss_device_disable(dssdev->next);
 
-	/*
-	 * Disable the internal encoder. This will disable the DSS output. The
-	 * DSI is treated as an exception as DSI pipelines still use the legacy
-	 * flow where the pipeline output controls the encoder.
-	 */
-	if (dssdev->type != OMAP_DISPLAY_TYPE_DSI) {
+	/* Disable the internal encoder. This will disable the DSS output. */
 	if (dssdev->ops && dssdev->ops->disable)
 		dssdev->ops->disable(dssdev);
 	dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
-	}
 
 	/*
 	 * Perform the post-disable operations on the chain of external devices
@@ -165,16 +159,10 @@ static void omap_encoder_enable(struct drm_encoder *encoder)
 	/* Prepare the chain of external devices for pipeline enable. */
 	omapdss_device_pre_enable(dssdev->next);
 
-	/*
-	 * Enable the internal encoder. This will enable the DSS output. The
-	 * DSI is treated as an exception as DSI pipelines still use the legacy
-	 * flow where the pipeline output controls the encoder.
-	 */
-	if (dssdev->type != OMAP_DISPLAY_TYPE_DSI) {
+	/* Enable the internal encoder. This will enable the DSS output. */
 	if (dssdev->ops && dssdev->ops->enable)
 		dssdev->ops->enable(dssdev);
 	dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
-	}
 
 	/*
 	 * Enable the chain of external devices, starting at the one at the