linux-kernel - [PATCH v13 16/17] drm: bridge: analogix/dp: add panel prepare/unprepare in suspend/resume time

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Date:	Fri, 22 Jan 2016 09:56:31 +0800
From:	Yakir Yang <ykk@...k-chips.com>
To:	Inki Dae <inki.dae@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Jingoo Han <jingoohan1@...il.com>,
	Thierry Reding <treding@...dia.com>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Rob Herring <robh+dt@...nel.org>,
	Heiko Stuebner <heiko@...ech.de>,
	Mark Yao <mark.yao@...k-chips.com>
Cc:	Russell King <linux@....linux.org.uk>, emil.l.velikov@...il.com,
	Gustavo Padovan <gustavo.padovan@...labora.co.uk>,
	Kishon Vijay Abraham I <kishon@...com>,
	javier@....samsung.com, Andy Yan <andy.yan@...k-chips.com>,
	dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
	linux-rockchip@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org,
	Yakir Yang <ykk@...k-chips.com>
Subject: [PATCH v13 16/17] 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.

Signed-off-by: Yakir Yang <ykk@...k-chips.com>
---
Changes in v13: None
Changes in v12: None
Changes in v11: None
Changes in v10: None
Changes in v9: None
Changes in v8: None
Changes in v7: None
Changes in v6: None
Changes in v5: None
Changes in v4: None
Changes in v3: None
Changes in v2: None

 drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
index bc59e8d..5292b28 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);
-- 
1.9.1