On Tue, 4 Oct 2016 14:12:21 +0200 Thomas Petazzoni <thomas.petazzoni@xxxxxxxxxxxxxxxxxx> wrote: > > > Add the case of a burst of 4 which is handled by the SoC. > > > > > > Signed-off-by: Mylène Josserand <mylene.josserand@xxxxxxxxxxxxxxxxxx> > > > --- > > > drivers/dma/sun6i-dma.c | 2 ++ > > > 1 file changed, 2 insertions(+) > > > > > > diff --git a/drivers/dma/sun6i-dma.c b/drivers/dma/sun6i-dma.c > > > index 8346199..0485204 100644 > > > --- a/drivers/dma/sun6i-dma.c > > > +++ b/drivers/dma/sun6i-dma.c > > > @@ -240,6 +240,8 @@ static inline s8 convert_burst(u32 maxburst) > > > switch (maxburst) { > > > case 1: > > > return 0; > > > + case 4: > > > + return 1; > > > case 8: > > > return 2; > > > default: > > > -- > > > 2.9.3 > > > > This patch has already been rejected by Maxime in the threads > > http://www.spinics.net/lists/dmaengine/msg08610.html > > and > > http://www.spinics.net/lists/dmaengine/msg08719.html > > > > I hope you will find the way he wants for this maxburst to be added. > > I was about to reply to Mylene's e-mail, suggesting that she should add > a comment in the code (and maybe in the commit log) to explain why this > addition is needed, and also that even though the schematics say that > value "1" (max burst size of 4 bytes) is reserved, it is in fact > incorrect. The Allwinner BSP code is really using this value, and it's > the value that makes audio work, so we believe the datasheet is simply > incorrect. > > We already discussed it with Maxime, so I believe he should agree this > time. But I would suggest to have such details explained in the commit > log and in a comment in the code. Strange. Looking at the datasheets of the A23, A31, A33, A83T and H3 (these are the SoCs using the DMA sun6i), only the H3 can have 4 as the burst size (the doc is unclear for the A31). Well, I was submitting for the H3, Mylène is submitting for the A33. So, what about the A23, A31 and A83T? -- Ken ar c'hentañ | ** Breizh ha Linux atav! ** Jef | http://moinejf.free.fr/ -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html