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authorFaiz Abbas <faiz_abbas@ti.com>2019-05-02 10:47:48 +0200
committerTony Lindgren <tony@atomide.com>2019-05-02 16:42:38 +0200
commit88a748419b84187fd1da05637b8e5928b04a1e06 (patch)
treedaceb1ca901c8ebad89c1878e8702552048c8291 /arch/arm/boot/dts/am57xx-idk-common.dtsi
parentLinux 5.0 (diff)
downloadlinux-88a748419b84187fd1da05637b8e5928b04a1e06.tar.xz
linux-88a748419b84187fd1da05637b8e5928b04a1e06.zip
ARM: dts: am57xx-idk: Remove support for voltage switching for SD card
If UHS speed modes are enabled, a compatible SD card switches down to 1.8V during enumeration. If after this a software reboot/crash takes place and on-chip ROM tries to enumerate the SD card, the difference in IO voltages (host @ 3.3V and card @ 1.8V) may end up damaging the card. The fix for this is to have support for power cycling the card in hardware (with a PORz/soft-reset line causing a power cycle of the card). Since am571x-, am572x- and am574x-idk don't have this capability, disable voltage switching for these boards. The major effect of this is that the maximum supported speed mode is now high speed(50 MHz) down from SDR104(200 MHz). Cc: <stable@vger.kernel.org> Signed-off-by: Faiz Abbas <faiz_abbas@ti.com> Signed-off-by: Tony Lindgren <tony@atomide.com>
Diffstat (limited to 'arch/arm/boot/dts/am57xx-idk-common.dtsi')
-rw-r--r--arch/arm/boot/dts/am57xx-idk-common.dtsi1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arm/boot/dts/am57xx-idk-common.dtsi b/arch/arm/boot/dts/am57xx-idk-common.dtsi
index f7bd26458915..42e433da79ec 100644
--- a/arch/arm/boot/dts/am57xx-idk-common.dtsi
+++ b/arch/arm/boot/dts/am57xx-idk-common.dtsi
@@ -420,6 +420,7 @@
vqmmc-supply = <&ldo1_reg>;
bus-width = <4>;
cd-gpios = <&gpio6 27 GPIO_ACTIVE_LOW>; /* gpio 219 */
+ no-1-8-v;
};
&mmc2 {