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linux/drivers
Lothar Waßmann 7ad7a345a4 dma: mxs-dma: Don't use CLKGATE bits in CTRL0 to disable DMA channels
This is how the original Freescale code (unintentionally) worked,
because the code path which would have asserted the CLKGATE bit was
never actually reached in their code.
This fixes the nefarious "DMA timout" bug when multiple DMA channels
(e.g. GPMI NAND and MMC) are used at the same time.
If a better fix for this problem should be found, the clkgate handling
could be reinstated.
See http://lists.infradead.org/pipermail/linux-arm-kernel/2011-September/065228.html

Also reverse the order of mxs_dma_disable_chan() and
mxs_dma_reset_chan() in mxs_dma_control() because mxs_dma_reset_chan()
can only work when the DMA channel is enabled.

Signed-off-by: Lothar Waßmann <LW@KARO-electronics.de>
Signed-off-by: Vinod Koul <vinod.koul@linux.intel.com>
2011-12-23 20:54:55 +05:30
..
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devfreq
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dma dma: mxs-dma: Don't use CLKGATE bits in CTRL0 to disable DMA channels 2011-12-23 20:54:55 +05:30
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md device-mapper: using EXPORT_SYBOL in dm-space-map-checker.c needs export.h 2011-11-07 10:29:10 -08:00
media Merge branch 'dma_slave_direction' into next_test_dirn 2011-11-17 14:54:57 +05:30
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tc
telephony
thermal thermal: Prevent polling from happening during system suspend 2011-11-06 20:38:49 -05:00
tty Merge branch 'dma_slave_direction' into next_test_dirn 2011-11-17 14:54:57 +05:30
uio
usb Merge branch 'dma_slave_direction' into next_test_dirn 2011-11-17 14:54:57 +05:30
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