dts:sdmmc: slow down sdmmc frequence to 37.5MHz for SDK board

SDK board sdmmc can't run 50MHz, otherwise SD initialising will return error.
log as below. slow down sdmmc frequence to 37.5MHz can fix it.

<4>[  802.611901]  [0:    kworker/0:2:  644] rk_sdmmc: BOOT   The card is inserted.  ===!!!!!!==[mmc1]
<6>[  802.838728]  [0:  kworker/u16:0:    6] mmc_host mmc1: Bus speed (slot 0) = 50000000Hz (slot req 400000Hz, actual 3
96825HZ div = 63)
<4>[  802.838858]  [0:  kworker/u16:0:    6] rk_sdmmc: BOOT dw_mci_setup_bus: argue clk_mmc workaround out 800000Hz for
init[mmc1]
<6>[  802.990527]  [0:  kworker/u16:0:    6] mmc_host mmc1: Bus speed (slot 0) = 50000000Hz (slot req 50000000Hz, actual
50000000HZ div = 0)
<4>[  802.990671]  [0:  kworker/u16:0:    6] rk_sdmmc: BOOT dw_mci_setup_bus: argue clk_mmc workaround out normal clock
[mmc1]
<3>[  802.996461]  [0:  kworker/u16:0:    6] mmc1: error -84 whilst initialising SD card

Signed-off-by: hecanyang <hcy@rock-chips.com>

diff --git a/arch/arm64/boot/dts/rk3368-tb_8846.dts b/arch/arm64/boot/dts/rk3368-tb_8846.dts
index 082692810945ec8270668d92c60b7ff2af411619..1de26e2b51c828681021831c482202cd1dac1baf 100644 (file)
--- a/arch/arm64/boot/dts/rk3368-tb_8846.dts
+++ b/arch/arm64/boot/dts/rk3368-tb_8846.dts
@@ -282,8 +282,8 @@
 };
 
 &sdmmc {
-               clock-frequency = <50000000>;
-               clock-freq-min-max = <400000 50000000>;
+               clock-frequency = <37500000>;
+               clock-freq-min-max = <400000 37500000>;
                supports-highspeed;
                supports-sd;
                broken-cd;

diff --git a/arch/arm64/boot/dts/rk3368-tb_mipi.dts b/arch/arm64/boot/dts/rk3368-tb_mipi.dts
index e244e4ccbb9aab1f8d21923944c175c78bb02a6f..26a4a32b5b3bacdeb562694ce72910f5ab8b12f6 100644 (file)
--- a/arch/arm64/boot/dts/rk3368-tb_mipi.dts
+++ b/arch/arm64/boot/dts/rk3368-tb_mipi.dts
@@ -282,8 +282,8 @@
 };
 
 &sdmmc {
-               clock-frequency = <50000000>;
-               clock-freq-min-max = <400000 50000000>;
+               clock-frequency = <37500000>;
+               clock-freq-min-max = <400000 37500000>;
                supports-highspeed;
                supports-sd;
                broken-cd;