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| author | Aleksander Jan Bajkowski <A.Bajkowski@stud.elka.pw.edu.pl> | 2020-07-19 10:07:24 +0200 |
|---|---|---|
| committer | Adrian Schmutzler <freifunk@adrianschmutzler.de> | 2020-08-10 12:43:37 +0200 |
| commit | 37df722266a205c7bbbf333a67aad70253769f91 (patch) | |
| tree | 174634001cfe5bd6bfdf38dba2f5e9c7d8d163e9 /target/linux/ath79 | |
| parent | 04b99d9539b0fa239f95a2eef804c0ac864e1944 (diff) | |
| download | upstream-37df722266a205c7bbbf333a67aad70253769f91.tar.gz upstream-37df722266a205c7bbbf333a67aad70253769f91.tar.bz2 upstream-37df722266a205c7bbbf333a67aad70253769f91.zip | |
ath79: increase spi frequency on TL-WDR3500/3600/4300/4310
SPI Flash chip supports up to 33 MHz wihout fast read opcode.
Available frequencies are 112.5, 56.25, 37.5, 28.125, 22.5 etc.
This patch increases the nominal maximum frequency to 33 MHz,
reaching an effective increase from 22.5 to 28.125 MHz.
Formula to calculate SPI frequency:
Freq = 225 MHz / 2 / div
Before:
$ time dd if=/dev/mtd1 of=/dev/null bs=8M
0+1 records in
0+1 records out
real 0m 3.58s
user 0m 0.00s
sys 0m 3.57s
After:
$ time dd if=/dev/mtd1 of=/dev/null bs=8M
0+1 records in
0+1 records out
real 0m 2.95s
user 0m 0.00s
sys 0m 2.93s
Signed-off-by: Aleksander Jan Bajkowski <A.Bajkowski@stud.elka.pw.edu.pl>
[minor commit message adjustments]
Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
Diffstat (limited to 'target/linux/ath79')
| -rw-r--r-- | target/linux/ath79/dts/ar9344_tplink_tl-wdrxxxx.dtsi | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/target/linux/ath79/dts/ar9344_tplink_tl-wdrxxxx.dtsi b/target/linux/ath79/dts/ar9344_tplink_tl-wdrxxxx.dtsi index 124f4d50b2..489408520e 100644 --- a/target/linux/ath79/dts/ar9344_tplink_tl-wdrxxxx.dtsi +++ b/target/linux/ath79/dts/ar9344_tplink_tl-wdrxxxx.dtsi @@ -78,7 +78,7 @@ flash@0 { compatible = "jedec,spi-nor"; reg = <0>; - spi-max-frequency = <25000000>; + spi-max-frequency = <33000000>; partitions { compatible = "fixed-partitions"; |