[Bug 1579] New: spi-sd-card: use gradually increasing sleep times when waiting for write to finish

[bugzilla-daemon at rtems.org]

https://www.rtems.org/bugzilla/show_bug.cgi?id=1579

           Summary: spi-sd-card: use gradually increasing sleep times when
                    waiting for write to finish
           Product: RTEMS
           Version: HEAD
          Platform: All
        OS/Version: RTEMS
            Status: NEW
          Severity: enhancement
          Priority: P3
         Component: misc
        AssignedTo: sebastian.huber at embedded-brains.de
        ReportedBy: arnout at mind.be
                CC: joel.sherrill at oarcorp.com
        Depends on: 1567


The function sd_card_wait() waits for a block write to finish on the SD card
before issuing a new commands.  This is done by polling the SPI bus.  Although
the processor is yielded while waiting, this polling loop still blocks
lower-priority tasks while waiting.  In practice, when writing a lot of data
(which fills up the buffers inside the SD card), the wait times can run up to
250ms.

Attached patch uses increasing sleep times instead of just yielding.  It
depends on attachment 792 to bug 1567.

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