Hi Thomas
I ran the dmatest module on a kirkwood system. No obvious regressions.
Tested-by: Andrew Lunn <andrew@xxxxxxx>
Andrew
On Tue, Jun 30, 2015 at 04:36:52PM +0200, Thomas Petazzoni wrote:
> Commit 6f166312c6ea2 ("dmaengine: mv_xor: add support for a38x command
> in descriptor mode") introduced the support for a feature that
> appeared in Armada 38x: specifying the operation to be performed in a
> per-descriptor basis rather than globally per channel.
>
> However, when doing so, it changed the function mv_chan_set_mode() to
> use:
>
> if (IS_ENABLED(__BIG_ENDIAN))
>
> instead of:
>
> #if defined(__BIG_ENDIAN)
>
> While IS_ENABLED() is perfectly fine for CONFIG_* symbols, it is not
> for other symbols such as __BIG_ENDIAN that is provided directly by
> the compiler. Consequently, the commit broke support for big-endian,
> as the XOR_DESCRIPTOR_SWAP flag was not set in the XOR channel
> configuration register.
>
> The primarily visible effect was some nasty warnings and failures
> appearing during the self-test of the XOR unit:
>
> [ 1.197368] mv_xor d0060900.xor: error on chan 0. intr cause 0x00000082
> [ 1.197393] mv_xor d0060900.xor: config 0x00008440
> [ 1.197410] mv_xor d0060900.xor: activation 0x00000000
> [ 1.197427] mv_xor d0060900.xor: intr cause 0x00000082
> [ 1.197443] mv_xor d0060900.xor: intr mask 0x000003f7
> [ 1.197460] mv_xor d0060900.xor: error cause 0x00000000
> [ 1.197477] mv_xor d0060900.xor: error addr 0x00000000
> [ 1.197491] ------------[ cut here ]------------
> [ 1.197513] WARNING: CPU: 0 PID: 1 at ../drivers/dma/mv_xor.c:664 mv_xor_interrupt_handler+0x14c/0x170()
>
> See also:
>
> http://storage.kernelci.org/next/next-20150617/arm-mvebu_v7_defconfig+CONFIG_CPU_BIG_ENDIAN=y/lab-khilman/boot-armada-xp-openblocks-ax3-4.txt
>
> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@xxxxxxxxxxxxxxxxxx>
> Fixes: 6f166312c6ea2 ("dmaengine: mv_xor: add support for a38x command in descriptor mode")
> Reviewed-by: Maxime Ripard <maxime.ripard@xxxxxxxxxxxxxxxxxx>
> ---
> This fix should go in for 4.2.
> ---
> drivers/dma/mv_xor.c | 9 +++++----
> 1 file changed, 5 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/dma/mv_xor.c b/drivers/dma/mv_xor.c
> index fbaf1ea..f1325f6 100644
> --- a/drivers/dma/mv_xor.c
> +++ b/drivers/dma/mv_xor.c
> @@ -162,10 +162,11 @@ static void mv_chan_set_mode(struct mv_xor_chan *chan,
> config &= ~0x7;
> config |= op_mode;
>
> - if (IS_ENABLED(__BIG_ENDIAN))
> - config |= XOR_DESCRIPTOR_SWAP;
> - else
> - config &= ~XOR_DESCRIPTOR_SWAP;
> +#if defined(__BIG_ENDIAN)
> + config |= XOR_DESCRIPTOR_SWAP;
> +#else
> + config &= ~XOR_DESCRIPTOR_SWAP;
> +#endif
>
> writel_relaxed(config, XOR_CONFIG(chan));
> chan->current_type = type;
> --
> 2.4.5
>
>
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