From: arnd@arndb.de (Arnd Bergmann)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 2/8] dmaengine: mv_xor: add support for a38x command in descriptor mode
Date: Wed, 13 May 2015 10:46:45 +0200 [thread overview]
Message-ID: <2913865.DiE4h2cH6J@wuerfel> (raw)
In-Reply-To: <20150513081535.GS10961@lukather>
On Wednesday 13 May 2015 10:15:35 Maxime Ripard wrote:
> > Alternatively, you could leave the XOR_DESCRIPTOR_SWAP flag disabled
> > and just swap the descriptors manually like a lot of other drivers
> > do. You have to swap the mmio accesses anywya.
>
> That won't be easily doable however.
>
> Not only the endianness of the individual fields in the descriptor
> changes, but changing the endianness also swaps the fields themselves
> by pair of u32.
>
> You can see that here:
> http://lxr.free-electrons.com/source/drivers/dma/mv_xor.h#L159
>
> So I'm guessing that leaving it like it is was the more readable
> solution.
I see, yes that would get a bit ugly.
Arnd
next prev parent reply other threads:[~2015-05-13 8:46 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-12 15:37 [PATCH 0/8] ARM: mvebu: Add support for RAID6 PQ offloading Maxime Ripard
2015-05-12 15:37 ` [PATCH 1/8] dmaengine: mv_xor: Rename function for consistent naming Maxime Ripard
2015-05-12 15:37 ` [PATCH 2/8] dmaengine: mv_xor: add support for a38x command in descriptor mode Maxime Ripard
2015-05-12 15:49 ` Arnd Bergmann
2015-05-12 15:54 ` Thomas Petazzoni
2015-05-12 16:03 ` Arnd Bergmann
2015-05-13 8:15 ` Maxime Ripard
2015-05-13 8:46 ` Arnd Bergmann [this message]
2015-05-12 15:49 ` Thomas Petazzoni
2015-05-12 15:58 ` Andrew Lunn
2015-05-12 16:05 ` Thomas Petazzoni
2015-05-13 8:23 ` Maxime Ripard
2015-05-12 15:37 ` [PATCH 3/8] dmaengine: mv_xor: Enlarge descriptor pool size Maxime Ripard
2015-05-12 15:37 ` [PATCH 4/8] dmaengine: mv_xor: improve descriptors list handling and reduce locking Maxime Ripard
2015-05-12 15:37 ` [PATCH 5/8] dmaengine: mv_xor: bug fix for racing condition in descriptors cleanup Maxime Ripard
2015-05-12 15:51 ` Thomas Petazzoni
2015-05-12 15:37 ` [PATCH 6/8] async_tx: adding mult and sum_product flags Maxime Ripard
2015-05-12 16:05 ` Andrew Lunn
2015-05-13 8:45 ` Maxime Ripard
2015-05-12 15:37 ` [PATCH 7/8] dmaengine: mv_xor: add support for a38x RAID6 support Maxime Ripard
2015-05-12 15:37 ` [PATCH 8/8] ARM: mvebu: a38x: Enable A38x XOR engine features Maxime Ripard
2015-05-12 16:13 ` Andrew Lunn
2015-05-13 7:16 ` Lior Amsalem
2015-05-13 8:33 ` Maxime Ripard
2015-05-12 16:05 ` [PATCH 0/8] ARM: mvebu: Add support for RAID6 PQ offloading Dan Williams
2015-05-13 9:17 ` Maxime Ripard
2015-05-13 16:00 ` Dan Williams
2015-05-18 9:14 ` Maxime Ripard
2015-05-18 17:06 ` Dan Williams
2015-05-26 9:45 ` Maxime Ripard
2015-05-26 16:31 ` Dan Williams
2015-05-27 11:52 ` Boaz Harrosh
2015-06-02 14:41 ` Maxime Ripard
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