| Message ID | 20210113152630.28810-7-andre.przywara@arm.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | arm64: dts: allwinner: Various DT fixes | expand |
diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a64-pinebook.dts b/arch/arm64/boot/dts/allwinner/sun50i-a64-pinebook.dts index d07cf05549c3..7ae16541d14f 100644 --- a/arch/arm64/boot/dts/allwinner/sun50i-a64-pinebook.dts +++ b/arch/arm64/boot/dts/allwinner/sun50i-a64-pinebook.dts @@ -167,6 +167,7 @@ pinctrl-0 = <&mmc2_pins>, <&mmc2_ds_pin>; vmmc-supply = <®_dcdc1>; vqmmc-supply = <®_eldo1>; + max-frequency = <200000000>; bus-width = <8>; non-removable; cap-mmc-hw-reset; diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi index 19e9b8ca8432..57786fc120c3 100644 --- a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi +++ b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi @@ -514,7 +514,7 @@ resets = <&ccu RST_BUS_MMC2>; reset-names = "ahb"; interrupts = <GIC_SPI 62 IRQ_TYPE_LEVEL_HIGH>; - max-frequency = <200000000>; + max-frequency = <150000000>; status = "disabled"; #address-cells = <1>; #size-cells = <0>;
In contrast to the H6 (and later) manuals, the A64 datasheet does not specify any limitations in the maximum possible frequency for eMMC controllers. However experimentation has found that a 150 MHz limit similar to other SoCs and also the MMC0 and MMC1 controllers on the A64 seems to exist for the MMC2 controller. Limit the frequency for the MMC2 controller to 150 MHz in the SoC .dtsi. The Pinebook seems to be the an odd exception, since it apparently seems to work with 200 MHz as well, so overwrite this in its board .dts file. Tested on a Pine64-LTS: 200 MHz HS-200 fails, 150 MHz HS-200 works. Fixes: 22be992faea7 ("arm64: allwinner: a64: Increase the MMC max frequency") Signed-off-by: Andre Przywara <andre.przywara@arm.com> --- arch/arm64/boot/dts/allwinner/sun50i-a64-pinebook.dts | 1 + arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi | 2 +- 2 files changed, 2 insertions(+), 1 deletion(-)