ARM: dts: rmobile: Increase off-on delay on the SD Vcc regulator

An ADATA 16GB Industrial MLC card has so much capacitance on the Vcc
pin that the usual toggling of regulator to power the card off and on
is insufficient. When the card is calibrated into UHS SDR104 mode, it
will remain in that mode across the power cycle and subsequent attempt
to communicate with the card will fail.

The test with this card is to insert it into an SDHI slot and perform
"mmc dev 0 ; mmc dev 0", where the second "mmc dev 0" will fail.

Fix this problem by increasing the off-on delay from 0 to 20 mS.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>

diff --git a/arch/arm/dts/r8a7795-h3ulcb-u-boot.dts b/arch/arm/dts/r8a7795-h3ulcb-u-boot.dts
index ebbd234..3de6407 100644 (file)
--- a/arch/arm/dts/r8a7795-h3ulcb-u-boot.dts
+++ b/arch/arm/dts/r8a7795-h3ulcb-u-boot.dts
@@ -19,6 +19,10 @@
        };
 };
 
+&vcc_sdhi0 {
+       u-boot,off-on-delay-us = <20000>;
+};
+
 &sdhi2_pins {
        groups = "sdhi2_data8", "sdhi2_ctrl", "sdhi2_ds";
        power-source = <1800>;

diff --git a/arch/arm/dts/r8a7795-salvator-x-u-boot.dts b/arch/arm/dts/r8a7795-salvator-x-u-boot.dts
index 8be5e41..a22028b 100644 (file)
--- a/arch/arm/dts/r8a7795-salvator-x-u-boot.dts
+++ b/arch/arm/dts/r8a7795-salvator-x-u-boot.dts
@@ -8,6 +8,14 @@
 #include "r8a7795-salvator-x.dts"
 #include "r8a7795-u-boot.dtsi"
 
+&vcc_sdhi0 {
+       u-boot,off-on-delay-us = <20000>;
+};
+
+&vcc_sdhi3 {
+       u-boot,off-on-delay-us = <20000>;
+};
+
 &sdhi2_pins {
        groups = "sdhi2_data8", "sdhi2_ctrl", "sdhi2_ds";
        power-source = <1800>;

diff --git a/arch/arm/dts/r8a7796-m3ulcb-u-boot.dts b/arch/arm/dts/r8a7796-m3ulcb-u-boot.dts
index 4e96008..612cc87 100644 (file)
--- a/arch/arm/dts/r8a7796-m3ulcb-u-boot.dts
+++ b/arch/arm/dts/r8a7796-m3ulcb-u-boot.dts
@@ -19,6 +19,10 @@
        };
 };
 
+&vcc_sdhi0 {
+       u-boot,off-on-delay-us = <20000>;
+};
+
 &sdhi2_pins {
        groups = "sdhi2_data8", "sdhi2_ctrl", "sdhi2_ds";
        power-source = <1800>;

diff --git a/arch/arm/dts/r8a7796-salvator-x-u-boot.dts b/arch/arm/dts/r8a7796-salvator-x-u-boot.dts
index 44b2f9f..c730b90 100644 (file)
--- a/arch/arm/dts/r8a7796-salvator-x-u-boot.dts
+++ b/arch/arm/dts/r8a7796-salvator-x-u-boot.dts
@@ -8,6 +8,14 @@
 #include "r8a7796-salvator-x.dts"
 #include "r8a7796-u-boot.dtsi"
 
+&vcc_sdhi0 {
+       u-boot,off-on-delay-us = <20000>;
+};
+
+&vcc_sdhi3 {
+       u-boot,off-on-delay-us = <20000>;
+};
+
 &sdhi2_pins {
        groups = "sdhi2_data8", "sdhi2_ctrl", "sdhi2_ds";
        power-source = <1800>;

diff --git a/arch/arm/dts/r8a77965-salvator-x-u-boot.dts b/arch/arm/dts/r8a77965-salvator-x-u-boot.dts
index 9e0cd26..cfc0f74 100644 (file)
--- a/arch/arm/dts/r8a77965-salvator-x-u-boot.dts
+++ b/arch/arm/dts/r8a77965-salvator-x-u-boot.dts
@@ -8,6 +8,14 @@
 #include "r8a77965-salvator-x.dts"
 #include "r8a77965-u-boot.dtsi"
 
+&vcc_sdhi0 {
+       u-boot,off-on-delay-us = <20000>;
+};
+
+&vcc_sdhi3 {
+       u-boot,off-on-delay-us = <20000>;
+};
+
 &sdhi2_pins {
        groups = "sdhi2_data8", "sdhi2_ctrl", "sdhi2_ds";
        power-source = <1800>;

diff --git a/arch/arm/dts/r8a77990-ebisu-u-boot.dts b/arch/arm/dts/r8a77990-ebisu-u-boot.dts
index b030d5c..4c1669e 100644 (file)
--- a/arch/arm/dts/r8a77990-ebisu-u-boot.dts
+++ b/arch/arm/dts/r8a77990-ebisu-u-boot.dts
@@ -36,6 +36,7 @@
 
                gpio = <&gpio5 17 GPIO_ACTIVE_HIGH>;
                enable-active-high;
+               u-boot,off-on-delay-us = <20000>;
        };
 
        vccq_sdhi0: regulator-vccq-sdhi0 {
@@ -60,6 +61,7 @@
 
                gpio = <&gpio0 4 GPIO_ACTIVE_HIGH>;
                enable-active-high;
+               u-boot,off-on-delay-us = <20000>;
        };
 
        vccq_sdhi1: regulator-vccq-sdhi1 {