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dmaengine: edma: Document variables used for residue accounting

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The granular residue accounting code uses certain variables specifically
for residue accounting. Document these in the structure declaration.
Also move around some elements and group them together.

Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Joel Fernandes <joelf@ti.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Joel Fernandes 2014-04-28 15:19:31 -05:00 committed by Vinod Koul
parent 740b41f788
commit 04361d887f
1 changed files with 27 additions and 5 deletions
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32
drivers/dma/edma.c
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@ -70,12 +70,34 @@ struct edma_desc {
int cyclic;
int absync;
int pset_nr;
int processed;
int processed_stat;
u32 residue;
u32 sg_len;
u32 residue_stat;
struct edma_chan *echan;
int processed;
/*
* The following 4 elements are used for residue accounting.
*
* - processed_stat: the number of SG elements we have traversed
* so far to cover accounting. This is updated directly to processed
* during edma_callback and is always <= processed, because processed
* refers to the number of pending transfer (programmed to EDMA
* controller), where as processed_stat tracks number of transfers
* accounted for so far.
*
* - residue: The amount of bytes we have left to transfer for this desc
*
* - residue_stat: The residue in bytes of data we have covered
* so far for accounting. This is updated directly to residue
* during callbacks to keep it current.
*
* - sg_len: Tracks the length of the current intermediate transfer,
* this is required to update the residue during intermediate transfer
* completion callback.
*/
int processed_stat;
u32 sg_len;
u32 residue;
u32 residue_stat;
struct edma_pset pset[0];
};