staging: wfx: repair external IRQ for SDIO

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When used over SDIO bus, device is able to use an external line to
signal IRQs (also called Out-Of-Band IRQ). The current code have several
problems:
  1. The ISR cannot directly acknowledge IRQ since access to the bus is
     not atomic. This patch use a threaded IRQ to solve that issue.
  2. On certain platforms, it is necessary to keep SDIO interruption
     enabled (with register SDIO_CCCR_IENx) (this part has inspired from
     the brcmfmac driver).

Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Link: https://lore.kernel.org/r/20200505123757.39506-6-Jerome.Pouiller@silabs.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Jérôme Pouiller 2020-05-05 14:37:47 +02:00 • committed by Greg Kroah-Hartman

parent ba52eddcbb

commit 5561770f80

1 changed files with 25 additions and 13 deletions

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drivers/staging/wfx/bus_sdio.c

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