Hi Yong,
On Mon, Jul 31, 2017 at 09:48:06AM +0800, Yong wrote:
> On Sun, 30 Jul 2017 09:08:01 +0300
> Baruch Siach <[email protected]> wrote:
> > On Fri, Jul 28, 2017 at 06:02:33PM +0200, Maxime Ripard wrote:
> > > On Thu, Jul 27, 2017 at 01:01:35PM +0800, Yong Deng wrote:
> > > > + regmap_write(sdev->regmap, CSI_CH_F0_BUFA_REG,
> > > > + (bus_addr + sdev->planar_offset[0]) >> 2);
> >
> > Why do you need the bit shift? Does that work for you?
> >
> > The User Manuals of both the V3s and the and the A33 (AKA R16) state that
> > the
> > BUFA field size in this register is 31:00, that is 32bit. I have found no
> > indication of this bit shift in the Olimex provided sunxi-vfe[1] driver. On
> > the A33 I have found that only after removing the bit-shift, (some sort of)
> > data started to appear in the buffer.
> >
> > [1]
> > https://github.com/hehopmajieh/a33_linux/tree/master/drivers/media/video/sunxi-vfe
>
> The Users Manuals do not document this bit shift. You should see line 10 to
> 32 in
> https://github.com/hehopmajieh/a33_linux/blob/master/drivers/media/video/sunxi-vfe/csi/csi_reg.c
Thanks. So for my reference, the SoCs that don't need bit shift are A31, A23,
and A33. SoCs that need bit shift are A80, A83, H3, and V3s (AKA V30).
baruch
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