HACK drm/panel: move some dsi commands from unprepare to disable

The commit 007ac02 ("drm/msm/dsi: switch to DRM_PANEL_BRIDGE")
breaks panels which send DSI commands in their .unprepare callbacks.
Migrate to using .disable for that for some panels.

Inspired-by: https://gitlab.com/sdm845-mainline/linux/-/commit/88d6f2060e1f4fd283075079088844e0474e8d8b

Co-developed-by: Joel Selvaraj <[email protected]>
Signed-off-by: Joel Selvaraj <[email protected]>
Co-developed-by: Caleb Connolly <[email protected]>
Signed-off-by: Caleb Connolly <[email protected]>
Signed-off-by: Alexey Minnekhanov <[email protected]>

Author: minlexx

drivers/gpu/drm/panel/panel-novatek-nt36672a.c

@@ -821,19 +821,25 @@ static int nt36672a_panel_power_off(struct drm_panel *panel)
 	return ret;
 }
 
-static int nt36672a_panel_unprepare(struct drm_panel *panel)
+static int nt36672a_panel_disable(struct drm_panel *panel)
 {
 	struct nt36672a_panel *pinfo = to_nt36672a_panel(panel);
-	int ret;
+	int ret = 0;
 
 	/* send off cmds */
 	if (pinfo->desc->off_cmds) {
 		ret = pinfo->desc->off_cmds(panel);
 		if (ret < 0)
 			dev_err(panel->dev, "failed to send DCS off cmds: %d\n", ret);
-		return ret;
 	}
 
+	return ret;
+}
+
+static int nt36672a_panel_unprepare(struct drm_panel *panel)
+{
+	int ret;
+
 	ret = nt36672a_panel_power_off(panel);
 	if (ret < 0)
 		dev_err(panel->dev, "power_off failed ret = %d\n", ret);
@@ -909,6 +915,7 @@ static int nt36672a_panel_get_modes(struct drm_panel *panel,
 }
 
 static const struct drm_panel_funcs panel_funcs = {
+	.disable = nt36672a_panel_disable,
 	.unprepare = nt36672a_panel_unprepare,
 	.prepare = nt36672a_panel_prepare,
 	.get_modes = nt36672a_panel_get_modes,