On 04/04/2023 14:54, Marc Gonzalez wrote:
> 2) SDIO is clocked higher on vendor system, but could
> lead to instabilities on some boards?
Apparently, I remembered wrong.
For mainline, arch/arm64/boot/dts/amlogic/meson-g12a-sei510.dts
bus-width = <4>;
cap-sd-highspeed;
sd-uhs-sdr50;
max-frequency = <100000000>;
For vendor, common/arch/arm64/boot/dts/amlogic/mesong12a_sei.dtsi
bus-width = <4>;
cap-sd-highspeed;
cap-mmc-highspeed;
max-frequency = <100000000>;
The vendor DTS has the following child node:
sdio {
pinname = "sdio";
ocr_avail = <0x200080>; /**VDD voltage 3.3 ~ 3.4 */
/* max_req_size = <0x20000>; */ /**128KB*/
max_req_size = <0x400>;
card_type = <3>;
/* 3:sdio device(ie:sdio-wifi),
* 4:SD combo (IO+mem) card
*/
dmode = "pio";
};
Thus, it seems that the performance delta comes from driver architecture
and different HW setup, rather than clock difference.
Regards
