From: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Date: Fri, 31 Aug 2018 16:38:05 +0000 (+0200)
Subject: ARM: tegra: apalis_t30: enable emmc ddr52 mode
X-Git-Tag: v5.4-rc1~2318^2~31^2~103
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=200be313fdc9bb9810bba3450698c1bf923b814f;p=platform%2Fkernel%2Flinux-rpi.git

ARM: tegra: apalis_t30: enable emmc ddr52 mode

Add mmc-ddr-1_8v property enabling eMMC DDR52 mode.

root@apalis-t30:~# cat /sys/kernel/debug/mmc1/ios
clock:          52000000 Hz
actual clock:   52000000 Hz
vdd:            21 (3.3 ~ 3.4 V)
bus mode:       2 (push-pull)
chip select:    0 (don't care)
power mode:     2 (on)
bus width:      3 (8 bits)
timing spec:    8 (mmc DDR52)
signal voltage: 1 (1.80 V)
driver type:    0 (driver type B)
root@apalis-t30:~# hdparm -t /dev/mmcblk1

/dev/mmcblk1:
 Timing buffered disk reads: 232 MB in  3.01 seconds =  77.10 MB/sec

Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
---

diff --git a/arch/arm/boot/dts/tegra30-apalis.dtsi b/arch/arm/boot/dts/tegra30-apalis.dtsi
index 2e2cdd4..6d6f174 100644
--- a/arch/arm/boot/dts/tegra30-apalis.dtsi
+++ b/arch/arm/boot/dts/tegra30-apalis.dtsi
@@ -1094,6 +1094,7 @@
 		non-removable;
 		vmmc-supply = <&reg_module_3v3>; /* VCC */
 		vqmmc-supply = <&reg_1v8_vio>; /* VCCQ */
+		mmc-ddr-1_8v;
 	};
 
 	clocks {