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Date:   Tue, 4 Apr 2023 17:42:19 +0200
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Subject: Re: Throughput & CPU usage of WiFi download
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From:   Marc Gonzalez <marc.w.gonzalez@free.fr>
To:     linux-amlogic@lists.infradead.org, linux-wireless@vger.kernel.org,
        brcm80211-dev-list.pdl@broadcom.com
Cc:     Arend van Spriel <aspriel@gmail.com>,
        Franky Lin <franky.lin@broadcom.com>,
        Hante Meuleman <hante.meuleman@broadcom.com>,
        Pierre-Hugues Husson <phh@phh.me>,
        Arnaud Vrac <avrac@freebox.fr>
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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