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From: Nate Lawson <njl@FreeBSD.org>
Date: Thu, 10 Jul 2003 10:22:46 -0700 (PDT)
To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org,
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X-FreeBSD-CVS-Branch: HEAD
Subject: cvs commit: src/sys/dev/acpica acpi_ec.c
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njl         2003/07/10 10:22:46 PDT

  FreeBSD src repository

  Modified files:
    sys/dev/acpica       acpi_ec.c 
  Log:
  Rewrite much of the embedded controller driver.
  * Always use polled mode.  The intr approach did not work for many
    controllers and required the hw.acpi.ec.event_driven workaround.
  * Only use an edge (not level) triggered GPE handler
  * Add sc->ec_mtx for locking operations to a single EC.  There were
    many race conditions earlier between an SCI event and EcRead/Write.
  * Use 1 ms as the global lock timeout
  * Only acquire global lock if _GLK != 0
  * Update EcWaitEvent to use an incremental backoff delay in its
    poll loop.  Wait 50 ms max instead of 10.  Most ECs respond
    in < 5 us (50 us when heavily loaded).  However, some time out
    occasionally even with a 10 ms timeout.  For delays past 1 ms, use
    msleep instead of DELAY to give SCI interrupts a chance to occur.
  * Add EcCommand to send a command and wait for the appropriate event.
  * The hw.acpi.ec.event_driven tunable is no longer applicable and
    has been removed.
  
  Ideas from:     Linux
  
  Revision  Changes    Path
  1.31      +264 -312  src/sys/dev/acpica/acpi_ec.c