4.2-stable review patch. If anyone has any objections, please let me know.
------------------
From: Tomi Valkeinen <tomi.valkei...@ti.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 <kis...@ti.com>
Signed-off-by: Tomi Valkeinen <tomi.valkei...@ti.com>
Reported-by: Louis McCarthy <compeo...@gmail.com>
Acked-by: Nishanth Menon <n...@ti.com>
Signed-off-by: Tony Lindgren <t...@atomide.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
arch/arm/boot/dts/am57xx-beagle-x15.dts | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/arch/arm/boot/dts/am57xx-beagle-x15.dts
+++ b/arch/arm/boot/dts/am57xx-beagle-x15.dts
@@ -415,11 +415,12 @@
/* 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 {
--
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