From 30cc7f3510fbdffbe1548bc008f1d99146dfbda6 Mon Sep 17 00:00:00 2001 From: Adrian Schmutzler Date: Sun, 17 May 2020 13:50:33 +0200 Subject: [PATCH] ramips: increase SPI frequency for ASUS RT-AC51U/RT-AC54U This increases the SPI frequency for both ASUS RT-AC51U and RT-AC54U. Speed comparison tests have been performed on RT-AC54U: - 10Mhz root@OpenWrt:~# time cat /dev/mtd* > /dev/null real 4m 37.78s user 0m 0.02s sys 2m 43.92s - 50Mhz root@OpenWrt:~# time cat /dev/mtd* > /dev/null real 1m 28.34s user 0m 0.03s sys 0m 46.96s - 50Mhz fast read root@OpenWrt:~# time cat /dev/mtd* > /dev/null real 1m 11.94s user 0m 0.01s sys 0m 46.94s - 80Mhz root@OpenWrt:~# time cat /dev/mtd* > /dev/null real 1m 12.31s user 0m 0.04s sys 0m 46.96s - 80Mhz fast read root@OpenWrt:~# time cat /dev/mtd* > /dev/null real 1m 12.15s user 0m 0.02s sys 0m 46.97s Based on that, we took 50 MHz with fast-read, as higher frequencies didn't yield further improvements. For the RT-AC51U, only the final configuration was tested. Tested-by: Zhijun You [RT-AC54U] Tested-by: Davide Fioravanti [RT-AC51U] Signed-off-by: Adrian Schmutzler --- target/linux/ramips/dts/mt7620a_asus_rt-ac5x.dtsi | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/target/linux/ramips/dts/mt7620a_asus_rt-ac5x.dtsi b/target/linux/ramips/dts/mt7620a_asus_rt-ac5x.dtsi index 83a789f287..3813efaa53 100644 --- a/target/linux/ramips/dts/mt7620a_asus_rt-ac5x.dtsi +++ b/target/linux/ramips/dts/mt7620a_asus_rt-ac5x.dtsi @@ -27,7 +27,9 @@ flash@0 { compatible = "jedec,spi-nor"; reg = <0>; - spi-max-frequency = <10000000>; + + spi-max-frequency = <50000000>; + m25p,fast-read; partitions { compatible = "fixed-partitions"; -- 2.25.1