OMAP: DSS2: DSI: add parameter to enter ulps on disable

Add parameter to omapdss_dsi_display_disable() which the panel driver
can use to tell if the DSI lanes should be put to ULPS before disabling
the interface.

This can be used to skip ULPS entry in cases where the panel doesn't
care about ULPS state, for example when the panel will be reset, or when
the display interface will be enabled again right after the disable.

This will speed up the operation considerably in cases where entering
ULPS would fail with timeout, and the panel driver isn't even interested
in entering ULPS.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

drivers/video/omap2/displays/panel-taal.c

@@ -932,7 +932,7 @@ static int taal_power_on(struct omap_dss_device *dssdev)
 
 	taal_hw_reset(dssdev);
 
-	omapdss_dsi_display_disable(dssdev, true);
+	omapdss_dsi_display_disable(dssdev, true, false);
 err0:
 	return r;
 }
@@ -955,7 +955,7 @@ static void taal_power_off(struct omap_dss_device *dssdev)
 		taal_hw_reset(dssdev);
 	}
 
-	omapdss_dsi_display_disable(dssdev, true);
+	omapdss_dsi_display_disable(dssdev, true, false);
 
 	td->enabled = 0;
 }

drivers/video/omap2/dss/dsi.c

@@ -3763,9 +3763,9 @@ static int dsi_display_init_dsi(struct omap_dss_device *dssdev)
 }
 
 static void dsi_display_uninit_dsi(struct omap_dss_device *dssdev,
-		bool disconnect_lanes)
+		bool disconnect_lanes, bool enter_ulps)
 {
-	if (!dsi.ulps_enabled)
+	if (enter_ulps && !dsi.ulps_enabled)
 		dsi_enter_ulps();
 
 	/* disable interface */
@@ -3848,7 +3848,7 @@ int omapdss_dsi_display_enable(struct omap_dss_device *dssdev)
 EXPORT_SYMBOL(omapdss_dsi_display_enable);
 
 void omapdss_dsi_display_disable(struct omap_dss_device *dssdev,
-		bool disconnect_lanes)
+		bool disconnect_lanes, bool enter_ulps)
 {
 	DSSDBG("dsi_display_disable\n");
 
@@ -3858,7 +3858,7 @@ void omapdss_dsi_display_disable(struct omap_dss_device *dssdev,
 
 	dsi_display_uninit_dispc(dssdev);
 
-	dsi_display_uninit_dsi(dssdev, disconnect_lanes);
+	dsi_display_uninit_dsi(dssdev, disconnect_lanes, enter_ulps);
 
 	enable_clocks(0);
 	dsi_enable_pll_clock(0);

include/video/omapdss.h

@@ -590,7 +590,7 @@ void omap_dsi_release_vc(struct omap_dss_device *dssdev, int channel);
 
 int omapdss_dsi_display_enable(struct omap_dss_device *dssdev);
 void omapdss_dsi_display_disable(struct omap_dss_device *dssdev,
-		bool disconnect_lanes);
+		bool disconnect_lanes, bool enter_ulps);
 
 int omapdss_dpi_display_enable(struct omap_dss_device *dssdev);
 void omapdss_dpi_display_disable(struct omap_dss_device *dssdev);