linux-kernel - [PATCH 3.19.y-ckt 134/155] ARM: dts: am57xx-beagle-x15: set VDD

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Date:	Thu, 12 Nov 2015 15:18:08 -0800
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Kishon Vijay Abraham I <kishon@...com>,
	Tomi Valkeinen <tomi.valkeinen@...com>,
	Tony Lindgren <tony@...mide.com>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.19.y-ckt 134/155] ARM: dts: am57xx-beagle-x15: set VDD_SD to always-on

3.19.8-ckt10 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Tomi Valkeinen <tomi.valkeinen@...com>

commit 7e381ec6a36aa44f15fc1a76e6efb9e2cd942e61 upstream.

LDO1 regulator (VDD_SD) is connected to SoC's vddshv8. vddshv8 needs to
be kept always powered (see commit 5a0f93c6576a ("ARM: dts: Add
am57xx-beagle-x15"), but at the moment VDD_SD is enabled/disabled
depending on whether an SD card is inserted or not.

This patch sets LDO1 regulator to always-on.

This patch has a side effect of fixing another issue, HDMI DDC not
working when SD card is not inserted:

Why this happens is that the tpd12s015 (HDMI level shifter/ESD
protection chip) has LS_OE GPIO input, which needs to be enabled for the
HDMI DDC to work. LS_OE comes from gpio6_28. The pin that provides
gpio6_28 is powered by vddshv8, and vddshv8 comes from VDD_SD.

So when SD card is not inserted, VDD_SD is disabled, and LS_OE stays
off.

The proper fix for the HDMI DDC issue would be to maybe have the pinctrl
framework manage the pin specific power.

Apparently this fixes also a third issue (copy paste from Kishon's
patch):

ldo1_reg in addition to being connected to the io lines is also
connected to the card detect line. On card removal, omap_hsmmc
driver does a regulator_disable causing card detect line to be
pulled down. This raises a card insertion interrupt and once the
MMC core detects there is no card inserted, it does a
regulator disable which again raises a card insertion interrupt.
This happens in a loop causing infinite MMC interrupts.

Fixes: 5a0f93c6576a ("ARM: dts: Add am57xx-beagle-x15")
Cc: Kishon Vijay Abraham I <kishon@...com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@...com>
Reported-by: Louis McCarthy <compeoree@...il.com>
Acked-by: Nishanth Menon <nm@...com>
Signed-off-by: Tony Lindgren <tony@...mide.com>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 arch/arm/boot/dts/am57xx-beagle-x15.dts | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/am57xx-beagle-x15.dts b/arch/arm/boot/dts/am57xx-beagle-x15.dts
index dcd2f5d..3e305b0 100644
--- a/arch/arm/boot/dts/am57xx-beagle-x15.dts
+++ b/arch/arm/boot/dts/am57xx-beagle-x15.dts
@@ -240,11 +240,12 @@
 				/* SMPS9 unused */

 				ldo1_reg: ldo1 {
-					/* VDD_SD  */
+					/* VDD_SD / VDDSHV8  */
 					regulator-name = "ldo1";
 					regulator-min-microvolt = <1800000>;
 					regulator-max-microvolt = <3300000>;
 					regulator-boot-on;
+					regulator-always-on;
 				};

 				ldo2_reg: ldo2 {
-- 
1.9.1

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