From: Yakir Yang <ykk@rock-chips.com>
Date: Mon, 15 Feb 2016 11:11:37 +0000 (+0800)
Subject: FROMLIST: drm: bridge: analogix/dp: add panel prepare/unprepare in suspend/resume... 
X-Git-Tag: firefly_0821_release~3068
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=2cf47cc4cfed2a07ffcb9186293dd51312909d63;p=firefly-linux-kernel-4.4.55.git

FROMLIST: drm: bridge: analogix/dp: add panel prepare/unprepare in suspend/resume time

Turn off the panel power in suspend time would help to reduce
power waste.

(am from https://patchwork.kernel.org/patch/8312971/)

Change-Id: Iac01ac4041a2486e0347ed0377abcc094ab493ea
Signed-off-by: Yakir Yang <ykk@rock-chips.com>
---

diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
index bc59e8d997b3..5292b28aec8a 100644
--- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
+++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
@@ -1400,6 +1400,12 @@ int analogix_dp_suspend(struct device *dev)
 	struct analogix_dp_device *dp = dev_get_drvdata(dev);
 
 	clk_disable_unprepare(dp->clock);
+
+	if (dp->plat_data->panel) {
+		if (drm_panel_unprepare(dp->plat_data->panel))
+			DRM_ERROR("failed to turnoff the panel\n");
+	}
+
 	return 0;
 }
 EXPORT_SYMBOL_GPL(analogix_dp_suspend);
@@ -1415,6 +1421,13 @@ int analogix_dp_resume(struct device *dev)
 		return ret;
 	}
 
+	if (dp->plat_data->panel) {
+		if (drm_panel_prepare(dp->plat_data->panel)) {
+			DRM_ERROR("failed to setup the panel\n");
+			return -EBUSY;
+		}
+	}
+
 	return 0;
 }
 EXPORT_SYMBOL_GPL(analogix_dp_resume);