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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>
Subject: Re: Throughput & CPU usage of WiFi download
Date: Tue, 4 Apr 2023 17:42:19 +0200	[thread overview]
Message-ID: <620b5ce8-8c87-5b45-2389-3eb99e15b8cd@free.fr> (raw)
In-Reply-To: <f2344e2e-2b53-9f57-d15a-25e5b03b3029@free.fr>

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


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      parent reply	other threads:[~2023-04-04 15:42 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-04-04 12:12 Marc Gonzalez
2023-04-04 12:54 ` [RESEND] " Marc Gonzalez
2023-04-04 13:36   ` Neil Armstrong
2023-04-04 15:42   ` Marc Gonzalez [this message]

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