linux-kernel - [PATCH v1 2/2] drm/bridge: analogix_dp: turn off the panel when eDP need to disable

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Thu, 21 Jul 2016 21:14:46 +0800
From:	Yakir Yang <ykk@...k-chips.com>
To:	Mark Yao <yzq@...k-chips.com>, Inki Dae <inki.dae@...sung.com>,
	Thierry Reding <treding@...dia.com>,
	Heiko Stuebner <heiko@...ech.de>
Cc:	Jingoo Han <jingoohan1@...il.com>,
	Javier Martinez Canillas <javier@....samsung.com>,
	Stéphane Marchesin <marcheu@...omium.org>,
	Sean Paul <seanpaul@...omium.org>,
	Tomasz Figa <tfiga@...omium.org>, dianders@...omium.org,
	David Airlie <airlied@...ux.ie>, daniel.vetter@...ll.ch,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	emil.l.velikov@...il.com, Yakir Yang <ykk@...k-chips.com>,
	linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
	linux-samsung-soc@...r.kernel.org,
	linux-rockchip@...ts.infradead.org
Subject: [PATCH v1 2/2] drm/bridge: analogix_dp: turn off the panel when eDP need to disable

Some panels (like Sharp LQ123P1JX31) need to be turn off when eDP
controller stop to send valid video signal, otherwhise panel would
go burn in, and keep flicker and flicker.

So it's better to turn off the panel when eDP need to disable, and
we need to turn on the panel in connector->detect() callback, so
that driver would detect panel status rightly.

Signed-off-by: Yakir Yang <ykk@...k-chips.com>
---
 drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
index 32715da..ea059b3 100644
--- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
+++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
@@ -961,6 +961,14 @@ analogix_dp_detect(struct drm_connector *connector, bool force)
 {
 	struct analogix_dp_device *dp = to_dp(connector);
 
+	/*
+	 * Panle would prepare for several times here, but don't worry it
+	 * would only enable the hardware at the first prepare time.
+	 */
+	if (dp->plat_data->panel)
+		if (drm_panel_prepare(dp->plat_data->panel))
+			DRM_ERROR("failed to setup the panel\n");
+
 	if (analogix_dp_detect_hpd(dp))
 		return connector_status_disconnected;
 
@@ -1063,7 +1071,8 @@ static void analogix_dp_bridge_disable(struct drm_bridge *bridge)
 		return;
 
 	if (dp->plat_data->panel) {
-		if (drm_panel_disable(dp->plat_data->panel)) {
+		if (drm_panel_disable(dp->plat_data->panel) ||
+		    drm_panel_unprepare(dp->plat_data->panel)) {
 			DRM_ERROR("failed to disable the panel\n");
 			return;
 		}
@@ -1333,13 +1342,6 @@ int analogix_dp_bind(struct device *dev, struct drm_device *drm_dev,
 
 	phy_power_on(dp->phy);
 
-	if (dp->plat_data->panel) {
-		if (drm_panel_prepare(dp->plat_data->panel)) {
-			DRM_ERROR("failed to setup the panel\n");
-			return -EBUSY;
-		}
-	}
-
 	analogix_dp_init_dp(dp);
 
 	ret = devm_request_threaded_irq(&pdev->dev, dp->irq,
-- 
1.9.1