Hello Adrian,
On 7/22/20 11:29 AM, m...@adrianschmutzler.de wrote:
-----Original Message-----
From: openwrt-devel [mailto:openwrt-devel-boun...@lists.openwrt.org]
On Behalf Of David Bauer
Sent: Dienstag, 21. Juli 2020 23:40
To: openwrt-devel@lists.openwrt.org
Subject: [PATCH] ramips: increase SPI frequency for MT7620 Archer
Increase the SPI frequency for the MT7620 based TP-Link Archer series to
30MHz.
Acked-by: Adrian Schmutzler <freif...@adrianschmutzler.de>
I'm not sure which are the frequency steps actually observed on that target,
but raising it above the abundant copy/pasted 10 MHz seems a good idea in any
case.
The SPI master can be operated in a range of {2..128}/SYS_CLK. (2..128
has to be power of two). So in the end it will transfer at around 18 MHz.
I don't want to crank this up further, as TP-Link uses a broad selection
of SPI chips on a single hardware revision on many of their devices.
Increasing performance might come at the cost of compatibility here.
Best wishes
David
Best
Adrian
TP-Link uses different SPI flash chips for the same board revision, so be
conservative to not break boards with a different chip. 30MHz should be well
supported by all chips.
Tested on Archer C2 v1 (GD25Q64B) and Archer C20i (W25Q64FV).
Archer C20i (before)
====================
root@OpenWrt:~# time dd if=/dev/mtd1 of=/tmp/test.bin bs=64k
122+0 records in
122+0 records out
real 0m 15.30s
user 0m 0.00s
sys 0m 15.29s
Archer C20i (after)
===================
root@OpenWrt:~# time dd if=/dev/mtd1 of=/tmp/test.bin bs=64k
122+0 records in
122+0 records out
real 0m 5.99s
user 0m 0.00s
sys 0m 5.98s
Signed-off-by: David Bauer <m...@david-bauer.net>
---
target/linux/ramips/dts/mt7620a_tplink_archer-c2-v1.dts | 2 +-
target/linux/ramips/dts/mt7620a_tplink_archer-mr200.dts | 2 +-
target/linux/ramips/dts/mt7620a_tplink_archer.dtsi | 2 +-
3 files changed, 3 insertions(+), 3 deletions(-)
diff --git a/target/linux/ramips/dts/mt7620a_tplink_archer-c2-v1.dts
b/target/linux/ramips/dts/mt7620a_tplink_archer-c2-v1.dts
index c0b2c1ae92..75ddc5fb5d 100644
--- a/target/linux/ramips/dts/mt7620a_tplink_archer-c2-v1.dts
+++ b/target/linux/ramips/dts/mt7620a_tplink_archer-c2-v1.dts
@@ -82,7 +82,7 @@
flash@0 {
compatible = "jedec,spi-nor";
reg = <0>;
- spi-max-frequency = <10000000>;
+ spi-max-frequency = <30000000>;
partitions {
compatible = "fixed-partitions";
diff --git a/target/linux/ramips/dts/mt7620a_tplink_archer-mr200.dts
b/target/linux/ramips/dts/mt7620a_tplink_archer-mr200.dts
index c3c0efdfe6..0c0f4bb8e9 100644
--- a/target/linux/ramips/dts/mt7620a_tplink_archer-mr200.dts
+++ b/target/linux/ramips/dts/mt7620a_tplink_archer-mr200.dts
@@ -121,7 +121,7 @@
flash@0 {
compatible = "jedec,spi-nor";
reg = <0>;
- spi-max-frequency = <10000000>;
+ spi-max-frequency = <30000000>;
partitions {
compatible = "fixed-partitions";
diff --git a/target/linux/ramips/dts/mt7620a_tplink_archer.dtsi
b/target/linux/ramips/dts/mt7620a_tplink_archer.dtsi
index 184627b9f4..670bad615d 100644
--- a/target/linux/ramips/dts/mt7620a_tplink_archer.dtsi
+++ b/target/linux/ramips/dts/mt7620a_tplink_archer.dtsi
@@ -43,7 +43,7 @@
flash@0 {
compatible = "jedec,spi-nor";
reg = <0>;
- spi-max-frequency = <10000000>;
+ spi-max-frequency = <30000000>;
partitions {
compatible = "fixed-partitions";
--
2.27.0
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