[openwrt/openwrt] rockchip: fix eMMC corruption on NanoPC-T6 with A3A444 chips

[LEDE Commits]

hauke pushed a commit to openwrt/openwrt.git, branch openwrt-24.10:
https://git.openwrt.org/c77f2b442e32b1f6bc3194143585efc968833e0c

commit c77f2b442e32b1f6bc3194143585efc968833e0c
Author: Grzegorz Sterniczuk <grzegorz at sternicz.uk>
AuthorDate: Sun Jul 13 17:22:33 2025 +0200

    rockchip: fix eMMC corruption on NanoPC-T6 with A3A444 chips
    
    Some NanoPC-T6 boards with A3A444 eMMC chips experience I/O errors and
    corruption when using HS400 mode. Downgrade to HS200 mode to ensure
    stable operation.
    
    Fixes: #18844
    Signed-off-by: Grzegorz Sterniczuk <grzegorz at sternicz.uk>
    Link: https://github.com/openwrt/openwrt/pull/19398
    [Add patch header]
    (cherry picked from commit c4586ceae85f7f8eefa08c71d0ef67bb07b5e0cc)
    [Merge fixes into patch 121]
    Signed-off-by: Tianling Shen <cnsztl at immortalwrt.org>
    Link: https://github.com/openwrt/openwrt/pull/19926
    Signed-off-by: Hauke Mehrtens <hauke at hauke-m.de>
---
 ...21-arm64-dts-rockchip-lower-mmc-speed-for-nanopc-t6.patch | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/target/linux/rockchip/patches-6.6/121-arm64-dts-rockchip-lower-mmc-speed-for-nanopc-t6.patch b/target/linux/rockchip/patches-6.6/121-arm64-dts-rockchip-lower-mmc-speed-for-nanopc-t6.patch
index 1b76fac103..901fcf2bc0 100644
--- a/target/linux/rockchip/patches-6.6/121-arm64-dts-rockchip-lower-mmc-speed-for-nanopc-t6.patch
+++ b/target/linux/rockchip/patches-6.6/121-arm64-dts-rockchip-lower-mmc-speed-for-nanopc-t6.patch
@@ -1,6 +1,16 @@
 --- a/arch/arm64/boot/dts/rockchip/rk3588-nanopc-t6.dtsi
 +++ b/arch/arm64/boot/dts/rockchip/rk3588-nanopc-t6.dtsi
-@@ -634,7 +634,7 @@
+@@ -621,8 +621,7 @@
+ 	no-sd;
+ 	non-removable;
+ 	max-frequency = <200000000>;
+-	mmc-hs400-1_8v;
+-	mmc-hs400-enhanced-strobe;
++	mmc-hs200-1_8v;
+ 	status = "okay";
+ };
+ 
+@@ -634,7 +633,7 @@
  	disable-wp;
  	no-mmc;
  	no-sdio;