On Tue, Aug 27, 2019 at 4:35 PM Code Kipper [off-list ref] wrote:

On Tue, 27 Aug 2019 at 10:01, Chen-Yu Tsai [off-list ref] wrote:

quoted

On Tue, Aug 27, 2019 at 1:55 PM Code Kipper [off-list ref] wrote:

quoted

On Tue, 27 Aug 2019 at 06:13, Chen-Yu Tsai [off-list ref] wrote:

quoted

On Tue, Aug 27, 2019 at 2:07 AM [off-list ref] wrote:

quoted

From: Marcus Cooper <redacted>

The regmap configuration is set up for the legacy block on the
A83T whereas it uses the new block with a larger register map.

Looking at the code Allwinner previously released [1], that doesn't seem to be
the case. Keep in mind that the register map shown in the user manual is for
the TDM interface, which we don't actually support right now.

Should it matter what we support right now?, the block according to the user
manual shows the bigger range. I don't have a A83T device and from what I

There are a total of four I2S controllers on the A83T. Currently three of them
are listed in the dtsi file, which are _not_ the one shown in the user manual.
The one shown is the fourth one, which is the TDM controller.

The configuration for the A83T suggests that it's a mixture of old and
new which I don't
think is the case considering it was released around the same time as
the H3. There
is enough similarity between the blocks for it to still work. For
example on the H6
we referenced by mistake the H3 block and we still got audio (with
only slight distortion).

The difference with the A83T here is large enough that if you play anything
it will simply stall. I already reported it as broken and Maxime has sent
fixes.

I would suggest to validate all of the i2s blocks we need to test
using the internal loopback
as that will also cover capture.

quoted

It's not like we haven't seen this before. IIRC the A64 also had two variants
of the I2S interface. The one coupled with the audio codec was different from
the others.

Yes...but the i2s of the audio codec was documented in the audio codec
section. I've used
this device to ensure that I've not broken anything in the old block
with these new changes.

quoted

quoted

gather not many users do. But the compatible for the H3 has been removed
and replaced with the settings for the A83T which also has default settings in
registers further up than SUNXI_RXCHMAP.

I'll sync up with Maxime on this.

quoted

quoted

The file shows the base address as 0x01c22800, and the last defined register
is SUNXI_RXCHMAP at 0x3c.

The I2S driver [2] also shows that it is the old register map size, but with
TX_FIFO and INT_STA swapped around. This might mean that it would need a
separate regmap_config, as the read/write callbacks need to be changed to
fit the swapped registers.

Finally, the TDM driver [3], which matches the TDM section in the manual, shows
a larger register map.

A83T is SUN8IW6, while SUN8IW7 refers to the H3.

Since when have we trusted Allwinner code?, the TDM labelled block
clearly supports

Since they haven't listed the I2S block in the user manual, so that is what we
have to go by.

The TDM section in the user manual only lists the block at 0x1c23000. The memory
map says DAUDIO-[012] for addresses 0x1c22000, 0x1c22400, 0x1c22800, and TDM for
address 0x1c23000. One would assume this meant these are somewhat different.

quoted

I2S. The biggest use case for this block is getting HDMI audio working
on the newer

I understand that.

quoted

devices(LibreELEC nightlies has a user base of over 300) and I've tested this on
numerous set ups over the last couple of years.

Tested on the H3, correct?

Yes....but only with the additional changes for multi-channel with my
LibreELEC build.
These changes I tested on my pine64 before pushing upstream.

quoted

quoted

Failing that reverting (3e9acd7ac693: "ASoC: sun4i-i2s: Remove
duplicated quirks structure")
would help.

I'll take a look. IIRC it worked with the old layout, with the two registers
swapped, playing standard 48 KHz / 16 bit audio when I added supported for
the A83T. Then again maybe the stars were perfectly aligned. At the very least
we could separate A83T and H3 as you suggested.

Maxime has sent a patch reverting the merger.

ChenYu

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel