ramips: gl-mt1300: downclock SPI to 50MHz

The SPI max frequency was set to 80MHz, considerably higher than the
vendor clocks it in their firmware (10MHz).  Multiple users reported
jffs2 corruption/instability in GitHub issue #10461.

My unit has a W25Q256; datasheet specifies maximum SPI frequency for
read command of 50MHz.

Thanks to @DragonBlueP for suggesting to eliminate m25p,fast-read;
and @MPannen1979 for identifying the problem.

Fixes: #10461
Signed-off-by: Michael Lyle <mlyle@lyle.org>
(cherry picked from commit 961e01fc67e7d9e60557df3474fa326216aa4839)

diff --git a/target/linux/ramips/dts/mt7621_glinet_gl-mt1300.dts b/target/linux/ramips/dts/mt7621_glinet_gl-mt1300.dts
index 384da1bfa9faaa67fd73fb15a664b3b3ca655a8b..7e3dc8cc03dfd7522cfaec13cc5993cd67906a9e 100644 (file)
--- a/target/linux/ramips/dts/mt7621_glinet_gl-mt1300.dts
+++ b/target/linux/ramips/dts/mt7621_glinet_gl-mt1300.dts
@@ -67,8 +67,7 @@
        flash@0 {
                compatible = "jedec,spi-nor";
                reg = <0>;
-               spi-max-frequency = <80000000>;
-               m25p,fast-read;
+               spi-max-frequency = <50000000>;
                broken-flash-reset;
 
                partitions {