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| author | James Hogan <james.hogan@imgtec.com> | 2011-06-29 09:28:43 +0100 |
|---|---|---|
| committer | Chris Ball <cjb@laptop.org> | 2011-07-20 17:21:05 -0400 |
| commit | 03e8cb534e7cc3f71a07528a44da7ce68e5b5708 (patch) | |
| tree | 989d0a96a03d8838de7617f6eb0062ed2a7065e6 /include/linux/mmc | |
| parent | 65d13516b2358c38ac56a5f83e989a6837dcf825 (diff) | |
| download | blackbird-op-linux-03e8cb534e7cc3f71a07528a44da7ce68e5b5708.tar.gz blackbird-op-linux-03e8cb534e7cc3f71a07528a44da7ce68e5b5708.zip | |
mmc: dw_mmc: fix stop when fallen back to PIO
There are several situations when dw_mci_submit_data_dma() decides to
fall back to PIO mode instead of using DMA, due to a short (to avoid
overhead) or "complex" (e.g. with unaligned buffers) transaction, even
though host->use_dma is set. However dw_mci_stop_dma() decides whether
to stop DMA or set the EVENT_XFER_COMPLETE event based on host->use_dma.
When falling back to PIO mode this results in data timeout errors
getting missed and the driver locking up.
Therefore add host->using_dma to indicate whether the current
transaction is using dma or not, and adjust dw_mci_stop_dma() to use
that instead.
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Acked-by: Will Newton <will.newton@imgtec.com>
Tested-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
Diffstat (limited to 'include/linux/mmc')
| -rw-r--r-- | include/linux/mmc/dw_mmc.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/mmc/dw_mmc.h b/include/linux/mmc/dw_mmc.h index f3f68ee08a1e..6b46819705d1 100644 --- a/include/linux/mmc/dw_mmc.h +++ b/include/linux/mmc/dw_mmc.h @@ -48,6 +48,7 @@ struct mmc_data; * @data: The data currently being transferred, or NULL if no data * transfer is in progress. * @use_dma: Whether DMA channel is initialized or not. + * @using_dma: Whether DMA is in use for the current transfer. * @sg_dma: Bus address of DMA buffer. * @sg_cpu: Virtual address of DMA buffer. * @dma_ops: Pointer to platform-specific DMA callbacks. @@ -121,6 +122,7 @@ struct dw_mci { /* DMA interface members*/ int use_dma; + int using_dma; dma_addr_t sg_dma; void *sg_cpu; |
