RTS525A Fixes - Lenovo Legion GO 2 SD Card Fixes #3
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An mdelay of 1 leads to unreliable SD card initialization on some cards, such as SanDisk Extreme PRO UHS-I microSD models, where they will be in a "card stuck busy" state after power on. Increasing the delay to 10 ms improves reliability from a 20% failure rate to 0% on two devices with RTS525A card readers after testing 30 s2idle/resume cycles. Signed-off-by: Matthew Schwartz <matthew.schwartz@linux.dev>
The chip's pm_schedule_suspend sequence can sometimes cause SD card reinitialization failures with "__mmc_poll_for_busy" after reaching the end of its operations. As a workaround, skip pm_schedule_suspend for RTS525A card readers. Signed-off-by: Matthew Schwartz <matthew.schwartz@linux.dev>
Using MMC_CAP_AGGRESSIVE_PM on RTS525A card readers causes game performance issues when the card reader comes back from idle into active use. This can be observed in Hades II when loading new sections of the game or menu after the card reader puts itself into idle, and presents as a 1-2 second hang. Disabling this capability for RTS525A eliminates the performance issues. Signed-off-by: Matthew Schwartz <matthew.schwartz@linux.dev>
KyleGospo
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Currently shipping in SteamOS and being actively upstreamed.
https://lkml.org/lkml/2026/1/3/293
https://lkml.org/lkml/2026/1/3/293