linux-kernel - [PATCH v2 2/4] ARM: dts: omap4-panda: Fix DVI EDID reads

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Date:	Tue, 18 Jun 2013 19:04:45 +0300
From:	Roger Quadros <rogerq@...com>
To:	<tony@...mide.com>, <b-cousson@...com>
CC:	<linux-omap@...r.kernel.org>,
	<devicetree-discuss@...ts.ozlabs.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, Roger Quadros <rogerq@...com>,
	Tomi Valkeinen <tomi.valkeinen@...com>
Subject: [PATCH v2 2/4] ARM: dts: omap4-panda: Fix DVI EDID reads

On Panda the +5V supply for DVI EDID is supplied by the
same regulator that poweres the USB Hub. Currently, the
DSS/DVI subsystem doesn't know how to manage this regulator
and so DVI EDID reads will fail if USB Hub is not enabled.

As a temporary fix we keep this regulator permanently enabled
on boot. This fixes the DVI EDID read problem.

CC: Tomi Valkeinen <tomi.valkeinen@...com>
Signed-off-by: Roger Quadros <rogerq@...com>
---
 arch/arm/boot/dts/omap4-panda-common.dtsi |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/arch/arm/boot/dts/omap4-panda-common.dtsi b/arch/arm/boot/dts/omap4-panda-common.dtsi
index 7a21e8e..e6e6c39 100644
--- a/arch/arm/boot/dts/omap4-panda-common.dtsi
+++ b/arch/arm/boot/dts/omap4-panda-common.dtsi
@@ -80,6 +80,13 @@
 		gpio = <&gpio1 1 0>;	/* gpio_1 */
 		startup-delay-us = <70000>;
 		enable-active-high;
+		/*
+		 * boot-on is required along with always-on as the
+		 * regulator framework doesn't enable the regulator
+		 * if boot-on is not there.
+		 */
+		regulator-always-on;
+		regulator-boot-on;
 	};
 
 	/* HS USB Host PHY on PORT 1 */
-- 
1.7.4.1

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