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To:     linux-mmc@vger.kernel.org
From:   Julian Sikorski <belegdol@gmail.com>
Subject: nothing happens upon SD card insertion (Asus Zenbook UM425IA,
 RTS522A)
Date:   Sat, 25 Dec 2021 11:45:57 +0100
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Hello,

I have an Asus Zenbook UM425IA laptop with Realtek RTS522A card reader:

02:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS522A 
PCI Express Card Reader (rev 01)


Almost every time when I insert a card into it, nothing happens - no 
dmesg message or anything.

echo 1 | sudo tee -a /sys/kernel/debug/tracing/events/mmc/enable

sudo cat /sys/kernel/debug/tracing/trace_pipe > mmc_trace.txt

also results in an empty file. If I am lucky, the card will be detected 
after some delay and the following will appear in the log:

Dez 25 11:34:41 snowball3 kernel: mmc0: cannot verify signal voltage switch

Dez 25 11:34:41 snowball3 kernel: mmc0: new ultra high speed SDR50 SDHC 
card at address aaaa

Dez 25 11:34:41 snowball3 kernel: mmcblk0: mmc0:aaaa SL32G 29.7 GiB

Dez 25 11:34:41 snowball3 kernel:  mmcblk0: p1


How can I investigate this further? As things stand now, the reader is 
almost unusable. I am using 5.15.11-200.s0ix01.fc35.x86_64 kernel. Thank 
you in advance.

Best regards,
Julian