[PATCH] ramips: increase SPI frequency for MT7620 Archer

[mail at adrianschmutzler.de]

> -----Original Message-----
> From: openwrt-devel [mailto:openwrt-devel-bounces at lists.openwrt.org]
> On Behalf Of David Bauer
> Sent: Dienstag, 21. Juli 2020 23:40
> To: openwrt-devel at 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 <freifunk at 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.

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 at 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 at 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 <mail at 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 at 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 at 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 at 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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