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| author | Sergei Shtylyov <sergei.shtylyov@cogentembedded.com> | 2013-08-24 23:38:15 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-09-26 17:21:58 -0700 |
| commit | 4963c59acdce47f2b15c49c58a8579f66cfa3ea7 (patch) | |
| tree | 8db23c5f2ce275873a3e5663de7c7ec644374b48 /drivers/of/base.c | |
| parent | 3ed52a384f887bb1dbd2f457bb35b8d7c1511523 (diff) | |
mmc: tmio_mmc_dma: fix PIO fallback on SDHI
commit f936f9b67b7f8c2eae01dd303a0e90bd777c4679 upstream.
I'm testing SH-Mobile SDHI driver in DMA mode with a new DMA controller using
'bonnie++' and getting DMA error after which the tmio_mmc_dma.c code falls back
to PIO but all commands time out after that. It turned out that the fallback
code calls tmio_mmc_enable_dma() with RX/TX channels already freed and pointers
to them cleared, so that the function bails out early instead of clearing the
DMA bit in the CTL_DMA_ENABLE register. The regression was introduced by commit
162f43e31c5a376ec16336e5d0ac973373d54c89 (mmc: tmio: fix a deadlock).
Moving tmio_mmc_enable_dma() calls to the top of the PIO fallback code in
tmio_mmc_start_dma_{rx|tx}() helps.
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Acked-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Chris Ball <cjb@laptop.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/of/base.c')
0 files changed, 0 insertions, 0 deletions