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| author | Thomas Gleixner <tglx@linutronix.de> | 2014-04-28 10:49:43 +0000 |
|---|---|---|
| committer | Vinod Koul <vinod.koul@intel.com> | 2014-04-30 10:34:39 +0530 |
| commit | cdae05a0f0f7d15837dfd6f4200e8caea03c9cbf (patch) | |
| tree | 9513241fb0020ad9cbd0b2e2fa36f707e09b864b /include | |
| parent | c2da2340e5818aa72b2e847f1f24b036742ea5c7 (diff) | |
| download | linux-stable-cdae05a0f0f7d15837dfd6f4200e8caea03c9cbf.tar.gz linux-stable-cdae05a0f0f7d15837dfd6f4200e8caea03c9cbf.tar.bz2 linux-stable-cdae05a0f0f7d15837dfd6f4200e8caea03c9cbf.zip | |
dmaengine: edma: Make reading the position of active channels work
As Joel pointed out, edma_read_position() uses memcpy_fromio() to read
the parameter ram. That's not synchronized with the internal update as
it does a byte by byte copy. We need to do a 32bit read to get a
consistent value.
Further reading destination and source is pointless. In DEV_TO_MEM
transfers we are only interested in the destination, in MEM_TO_DEV we
care about the source. In MEM_TO_MEM it really does not matter which
one you read.
Simple solution: Remove the pointers, select dest/source via a bool
and return the read value.
Remove the export of this function while at it. The only potential
user is the dmaengine and that's always builtin.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Sekhar Nori <nsekhar@ti.com>
Signed-off-by: Joel Fernandes <joelf@ti.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/platform_data/edma.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/platform_data/edma.h b/include/linux/platform_data/edma.h index 923f8a3e4ce0..12f134b1493c 100644 --- a/include/linux/platform_data/edma.h +++ b/include/linux/platform_data/edma.h @@ -130,7 +130,7 @@ void edma_set_src(unsigned slot, dma_addr_t src_port, enum address_mode mode, enum fifo_width); void edma_set_dest(unsigned slot, dma_addr_t dest_port, enum address_mode mode, enum fifo_width); -void edma_get_position(unsigned slot, dma_addr_t *src, dma_addr_t *dst); +dma_addr_t edma_get_position(unsigned slot, bool dst); void edma_set_src_index(unsigned slot, s16 src_bidx, s16 src_cidx); void edma_set_dest_index(unsigned slot, s16 dest_bidx, s16 dest_cidx); void edma_set_transfer_params(unsigned slot, u16 acnt, u16 bcnt, u16 ccnt, |