On 9/7/18 12:41 AM, Marius Strobl wrote:
On Thu, Sep 06, 2018 at 12:33:39PM +0200, Jakob Alvermark wrote:
Hi,
I discovered this by chance.
The SD card reader in my laptop has never worked, but now I noticed it
does after suspending and resuming.
The controller is probed and attached on boot:
sdhci_acpi1: <Intel Bay Trail/Braswell SDXC Controller> iomem
0x90a00000-0x90a00fff irq 47 on acpi0
But nothing happens if I put a card in. Unless I suspend and resume:
mmc1: <MMC/SD bus> on sdhci_acpi1
mmcsd0: 32GB <SDHC SL32G 8.0 SN 19CD02C0 MFG 11/2014 by 3 SD> at mmc1
50.0MHz/4bit/65535-block
Then I can remove and replug cards and it seems to work just fine.
I believe that making SD card insertion/removal with the integrated
SDHCI controlers of newer Intel SoCs work out-of-the-box requires
support for ACPI GPE interrupts and ACPI GPIO events respectively to
be added to FreeBSD. Otherwise insertion/removal interrutps/events
aren't reported and polling the card present state doesn't generally
work as a workaround with these controllers either, unfortunately.
I'm not aware of anyone working on the former, though.
Polling the card present state happens to work one time after SDHCI
initialization with these controllers which is why a card will be
attached when inserted as part of a suspend/resume cycle (resume of
mmc(4) had some bugs until some months ago, which probably explains
why that procedure hasn't worked as a workaround for you in the past).
Inserting the card before boot, unloading/loading sdhci_acpi.ko or
triggering detach/attach of sdhci_acpi(4) via devctl(8) should allow
to attach a card, too.
If a card is inserted before booting it is not detected.
Removing and inserting card after boot is not detected unless I suspend
and resume.
After I have suspended and resumed once, cards are detected. Removals
and insertions are detected as they happen.
Jakob
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