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SAMA5: Fix HSMCI race condition. Now memory card interface is functional with DMA

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Gregory Nutt
2013-08-10 18:01:23 -06:00
parent d60e9e14f6
commit da4cebf572
11 changed files with 362 additions and 111 deletions
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include/nuttx/sdio.h
+13 -2
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@@ -582,8 +582,19 @@
* Description:
* Enable/disable of a set of SDIO wait events. This is part of the
* the SDIO_WAITEVENT sequence. The set of to-be-waited-for events is
* configured before calling SDIO_EVENTWAIT. This is done in this way
* to help the driver to eliminate race conditions between the command
* configured before calling either calling SDIO_DMARECVSETUP,
* SDIO_DMASENDSETUP, or or SDIO_WAITEVENT. This is the recommended
* ordering:
*
* SDIO_WAITENABLE: Discard any pending interrupts, enable event(s)
* of interest
* SDIO_DMARECVSETUP/
* SDIO_DMASENDSETUP: Setup the logic that will trigger the event the
* event(s) of interest
* SDIO_WAITEVENT: Wait for the event of interest (which might
* already have occurred)
*
* This sequency should eliminate race conditions between the command/trasnfer
* setup and the subsequent events.
*
* The enabled events persist until either (1) SDIO_WAITENABLE is called