From 60e6f2cb6437c8f4926523978d60c277e48f5b46 Mon Sep 17 00:00:00 2001
From: Ondrej Jirman <megous@megous.com>
Date: Wed, 1 Jul 2020 18:29:25 +0200
Subject: drm/panel: st7703: Enter sleep after display off
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Git-commit: 43fc6db016a01793a89904ec71793337961ae5b0
Patch-mainline: v5.9-rc1
References: jsc#SLE-12680, jsc#SLE-12880, jsc#SLE-12882, jsc#SLE-12883, jsc#SLE-13496, jsc#SLE-15322

The datasheet suggests to issue sleep in after display off
as a part of the panel's shutdown sequence.

Signed-off-by: Ondrej Jirman <megous@megous.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Tested-by: Guido Günther <agx@sigxcpu.org>
Reviewed-by: Guido Günther <agx@sigxcpu.org>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20200701162928.1638874-11-megous@megous.com
Signed-off-by: Patrik Jakobsson <pjakobsson@suse.de>
---
 drivers/gpu/drm/panel/panel-sitronix-st7703.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/panel/panel-sitronix-st7703.c b/drivers/gpu/drm/panel/panel-sitronix-st7703.c
index dadb482b244d..7750179bca60 100644
--- a/drivers/gpu/drm/panel/panel-sitronix-st7703.c
+++ b/drivers/gpu/drm/panel/panel-sitronix-st7703.c
@@ -393,8 +393,19 @@ static int st7703_disable(struct drm_panel *panel)
 {
 	struct st7703 *ctx = panel_to_st7703(panel);
 	struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
+	int ret;
+
+	ret = mipi_dsi_dcs_set_display_off(dsi);
+	if (ret < 0)
+		DRM_DEV_ERROR(ctx->dev,
+			      "Failed to turn off the display: %d\n", ret);
 
-	return mipi_dsi_dcs_set_display_off(dsi);
+	ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
+	if (ret < 0)
+		DRM_DEV_ERROR(ctx->dev,
+			      "Failed to enter sleep mode: %d\n", ret);
+
+	return 0;
 }
 
 static int st7703_unprepare(struct drm_panel *panel)
-- 
2.29.2