dmaengine: mv_xor_v2: fix tx_submit() implementation

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commit 44d5887a8b upstream.

The mv_xor_v2_tx_submit() gets the next available HW descriptor by
calling mv_xor_v2_get_desq_write_ptr(), which reads a HW register
telling the next available HW descriptor. This was working fine when HW
descriptors were issued for processing directly in tx_submit().

However, as part of the review process of the driver, a change was
requested to move the actual kick-off of HW descriptors processing to
->issue_pending(). Due to this, reading the HW register to know the next
available HW descriptor no longer works.

So instead of using this HW register, we implemented a software index
pointing to the next available HW descriptor.

Fixes: 19a340b1a8 ("dmaengine: mv_xor_v2: new driver")
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Thomas Petazzoni 2017-05-05 11:57:48 +02:00 • committed by Greg Kroah-Hartman

parent 0d0918504a

commit b2c8bb06bc

1 changed files with 5 additions and 17 deletions

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drivers/dma/mv_xor_v2.c

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