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Sender: Larry Finger <larry.finger@gmail.com>
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Date:   Mon, 31 Jul 2023 12:07:25 -0500
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Subject: Re: Problem with rtw8723ds
To:     Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Cc:     Pkshih <pkshih@realtek.com>,
        linux-wireless <linux-wireless@vger.kernel.org>
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From:   Larry Finger <Larry.Finger@lwfinger.net>
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On 7/30/23 13:54, Martin Blumenstingl wrote:
> I have a few questions here:
> - is the wlan0 interface present?
> - does "$ ip link set up dev wlan0" do anything?
> - does "$ iw dev wlan0 scan" work?
> 
> Also do we know more about the host (e.g. which MMC/SDIO host driver
> is involved)?

Martin,

No, wlan0 is not set up. Anything referencing it will fail.

I have asked about the MMC/SDIO host, but the OP never responded to that 
question. The OP is an engineer, and not the best with software. His dmesg 
output lists the following:

mmc0: SDHCI controller on e0100000.mmc [e0100000.mmc] using ADMA
mmc1: SDHCI controller on e0101000.mmc [e0101000.mmc] using ADMA
sdhci-arasan e0101000.mmc: card claims to support voltages below defined range

That last line would indicate the pci-arasan controller. If that is not 
sufficient, how would we get that info?

The CPU is a Cortex-A9 dual-processor unit, and he is running Linux version 
5.4.0-xilinx (oe-user@oe-host). Dmesg also reports
CPU: ARMv7 Processor [413fc090] revision 0 (ARMv7), cr=18c5387d

If you want to eliminate the middle man and ask the OP questions directly, the 
GitHub thread is
https://github.com/lwfinger/rtl8723ds/issues/41#issuecomment-1656990344

I have tried to get some logging of the SDIO traffic to see if I can find 
differences between the vendor and rtw88 drivers. Thus far, I have not made much 
progress.

One thing he has noted is that the LDO with the vendor driver is 1.25 V, but 
that rtw88 has it as low as 0.82 V. On one occasion, it was 1.22, but that made 
no difference.

Larry