• Ulf Hansson's avatar
    mmc: sdio: Add API to manage SDIO IRQs from a workqueue · 68269660
    Ulf Hansson authored
    For hosts not supporting MMC_CAP2_SDIO_IRQ_NOTHREAD but MMC_CAP_SDIO_IRQ,
    the SDIO IRQs are processed from a dedicated kernel thread. For these
    cases, the host calls mmc_signal_sdio_irq() from its ISR to signal a new
    SDIO IRQ.
    
    Signaling an SDIO IRQ makes the host's ->enable_sdio_irq() callback to be
    invoked to temporary disable the IRQs, before the kernel thread is woken up
    to process it. When processing of the IRQs are completed, they are
    re-enabled by the kernel thread, again via invoking the host's
    ->enable_sdio_irq().
    
    The observation from this, is that the execution path is being unnecessary
    complex, as the host driver already knows that it needs to temporary
    disable the IRQs before signaling a new one. Moreover, replacing the kernel
    thread with a work/workqueue would not only greatly simplify the code, but
    also make it more robust.
    
    To address the above problems, let's continue to build upon the support for
    MMC_CAP2_SDIO_IRQ_NOTHREAD, as it al...
    68269660
sdio_ops.h 1.18 KB