Hi Vinod,
I know that the memset capabilities have been removed a while back
because no-one was actually using it.
On the Atmel SAMA5D4, we would really benefit from such a feature in
the kernel. Indeed, that SoC lacks a GPU, even though having a
display, so we can actually use the DMA controller to accelerate the
framebuffer manipulations instead of the GPU or some hardware
controller like usually done, involving using memset.
The current way that it's done is through an userspace API for
dmaengine. Maybe that could be moved to the DRM driver for this SoC, I
don't know and we can argue about this, but the bottom line is that
for our use case, we do need to have memset back :)
I understand that you might not like it, especially since we're not
really introducing a new user and even the current code we have based
on this is far from upstreamable, so we won't even introduce any user
for that code short term.
Apart from that, that serie is based on the interleaved support for
that driver I sent earlier today.
Thanks,
Maxime
Changes from v1:
- Removed ASYNC_TX_MEMSET
- Added back fill_align field
- Added a dmaengine_prep_dma_memset field
Maxime Ripard (2):
dmaengine: Revert "drivers/dma: remove unused support for MEMSET
operations"
dmaengine: xdmac: Add memset support
drivers/dma/at_xdmac.c | 89 +++++++++++++++++++++++++++++++++++++++++++++++
drivers/dma/dmaengine.c | 2 ++
include/linux/dmaengine.h | 24 +++++++++++++
3 files changed, 115 insertions(+)
--
2.4.1
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