linux-toradex.git/drivers/dma/omap-dma.c, branch v4.9.67

dmaengine: omap-dma: Fix dynamic lch_map allocation

2017-01-19T19:18:03+00:00

commit 836c3ce2566fb8c1754f8d7c9534cad9bc8a6879 upstream.

The original patch did not done what it was supposed to be doing and even
worst it broke legacy boot (OMAP1).

The lch_map size should be the number of available logical channels in sDMA
and the od->dma_requests should store the number of available DMA request
lines usable in sDMA.

In legacy mode we do not have a way to get the DMA request count, in that
case we use OMAP_SDMA_REQUESTS (127), despite the fact that OMAP1510 have
only 31 DMA request line.

Fixes: 2d1a9a946fae ("dmaengine: omap-dma: Dynamically allocate memory for lch_map")
Reported-by: Aaro Koskinen 
Signed-off-by: Peter Ujfalusi 
Tested-by: Aaro Koskinen 
Signed-off-by: Vinod Koul 
Signed-off-by: Greg Kroah-Hartman

dmaengine: omap-dma: Enable burst and data pack for SG

2016-10-01T06:05:27+00:00

Enable the burst and data pack modes for the scatter-gather
in order to improve the throughput of the data transfers.

The improvement has been verified with MMC HS200 mode in
the DRA72 EVM using the iozone tool to compare the read
throughput (in kB/s) with and without burst/pack for
different reclens (in kB).

                              With
    reclen    Baseline   sDMA burst/pack
    ------    --------   ---------------
       64       46568         50820
      128       57564         63413
      256       65634         74937
      512       72427         83483
     1024       74563         84504
     2048       76265         86079
     4096       78045         87335
     8192       78989         88154
    16384       81265         91034

Signed-off-by: Misael Lopez Cruz 
Signed-off-by: Peter Ujfalusi 
Signed-off-by: Vinod Koul

dmaengine: omap-dma: Correct type2 descriptor's member types

2016-09-14T13:32:11+00:00

The type of CDEI, CSEI, CDFI and CSFI is signed.
This did not caused issue so far as we only use unsigned values.

Signed-off-by: Peter Ujfalusi 
Signed-off-by: Vinod Koul

dmaengine: omap-dma: Support for LinkedList transfer of slave_sg

2016-08-10T17:29:13+00:00

sDMA in OMAP3630 or newer SoC have support for LinkedList transfer. When
LinkedList or Descriptor load feature is present we can create the
descriptors for each and program sDMA to walk through the list of
descriptors instead of the current way of sDMA stop, sDMA reconfiguration
and sDMA start after each SG transfer.
By using LinkedList transfer in sDMA the number of DMA interrupts will
decrease dramatically.
Booting up the board with filesystem on SD card for example:
W/o LinkedList support:
 27:       4436          0     WUGEN  13 Level     omap-dma-engine

Same board/filesystem with this patch:
 27:       1027          0     WUGEN  13 Level     omap-dma-engine

Or copying files from SD card to eMCC:
2.1G    /usr/
232001

W/o LinkedList we see ~761069 DMA interrupts.
With LinkedList support it is down to ~269314 DMA interrupts.

With the decreased DMA interrupt number the CPU load is dropping
significantly as well.

Signed-off-by: Peter Ujfalusi 
Signed-off-by: Vinod Koul

dmaengine: omap-dma: Use pointer to omap_sg in slave_sg setup's loop

2016-08-10T17:29:12+00:00

Instead of accessing the array via index, take the pointer first and use
it to set up the omap_sg struct.

Signed-off-by: Peter Ujfalusi 
Signed-off-by: Vinod Koul

dmaengine: omap-dma: Add more debug information when freeing channel

2016-08-10T17:29:12+00:00

Print the same information the driver prints when allocating the channel
resources regarding to the sDMA channel.

Signed-off-by: Peter Ujfalusi 
Signed-off-by: Vinod Koul

dmaengine: omap-dma: Dynamically allocate memory for lch_map

2016-08-10T17:29:12+00:00

On OMAP1 platforms we do not have 32 channels available. Allocate the
lch_map based on the available channels. This way we are not going to have
more visible channels then it is available on the platform.

Signed-off-by: Peter Ujfalusi 
Signed-off-by: Vinod Koul

dmaengine: omap-dma: Simplify omap_dma_callback

2016-08-10T17:29:12+00:00

Flatten the indentation level of the function which gives better view on
the cases we handle here.

Signed-off-by: Peter Ujfalusi 
Signed-off-by: Vinod Koul

dmaengine: omap-dma: Simplify omap_dma_start_sg parameter list

2016-08-10T17:29:12+00:00

We can drop the (sg)idx parameter for the omap_dma_start_sg() function and
increment the sgidx inside of the same function.

Signed-off-by: Peter Ujfalusi 
Signed-off-by: Vinod Koul

Merge branch 'topic/dmaengine_cleanups' into for-linus

2016-07-28T04:40:37+00:00