Re: [PATCH v2 5/5] ARM: dts: r8a7794: add sound support

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On 02/17/2016 08:38 AM, Simon Horman wrote:

Define the generic R8A7794 part of  the sound device node.
This sound device  is a complex one and comprises the Audio Clock Generator
(ADG), Sampling Rate Converter Unit (SCU), Serial Sound Interface [Unit]
(SSI[U]), and Audio DMAC-Peripheral-Peripheral.
It is up  to the board file to enable the device.

This patch is based on the R8A7791 sound work by Kuninori Morimoto.

Signed-off-by: Sergei Shtylyov <sergei.shtylyov@xxxxxxxxxxxxxxxxxx>
(snip)
+		rcar_sound,src {
+			src1: src@1 {
+				interrupts = <GIC_SPI 353 IRQ_TYPE_LEVEL_HIGH>;
+				dmas = <&audma0 0x87>, <&audma0 0x9c>;
+				dma-names = "rx", "tx";
+			};
+			src2: src@2 {
+				interrupts = <GIC_SPI 354 IRQ_TYPE_LEVEL_HIGH>;
+				dmas = <&audma0 0x89>, <&audma0 0x9e>;
+				dma-names = "rx", "tx";
+			};
+			src3: src@3 {
+				interrupts = <GIC_SPI 355 IRQ_TYPE_LEVEL_HIGH>;
+				dmas = <&audma0 0x8b>, <&audma0 0xa0>;
+				dma-names = "rx", "tx";
+			};
+			src4: src@4 {
+				interrupts = <GIC_SPI 356 IRQ_TYPE_LEVEL_HIGH>;
+				dmas = <&audma0 0x8d>, <&audma0 0xb0>;
+				dma-names = "rx", "tx";
+			};
+			src5: src@5 {
+				interrupts = <GIC_SPI 357 IRQ_TYPE_LEVEL_HIGH>;
+				dmas = <&audma0 0x8f>, <&audma0 0xb2>;
+				dma-names = "rx", "tx";
+			};
+			src6: src@6 {
+				interrupts = <GIC_SPI 358 IRQ_TYPE_LEVEL_HIGH>;
+				dmas = <&audma0 0x91>, <&audma0 0xb4>;
+				dma-names = "rx", "tx";
+			};
+		};

I think this can't work correctly, because driver is assuming
DT has all channles (from 0). (see linux/sound/soc/sh/rcar/src.c :: rsnd_src_probe)
Can you adds dummy src0 with some comments ? or fix src.c driver ?

I would prefer the driver to be fixed (I had a similar patchset locally
and I found it doesn't work).

    You mean you had R8A7794 sound patch set too?

Yes, I was working on it recently.
I suppose we should coordinate these things in future to avoid
duplicated effort.

    Yes, seems a good idea now. :-)

The reason is that DT should describe
the hardware rather than the current state of the software.

    Yes, of course. Just tell me do I have to fix the driver *before* this
patch set is accepted?

I did not entirely get to the bottom of the problem, but I think that at
the very least something needs to be done about the for_each_rsnd_src()
loop in rsnd_src_probe.

    It's not that it replies to my question. :-)
    So you're looking at this issue yourself?

I have not got very far, as you can see, but I was planning to look into it.
I don't mind if you want to do so.

    After consultation with the management, I'm going to look into this issue
myself. :-)

Excellent.

But not immediately. I have some other things to look at before that (DU and AVB), they'll going to take some (significant) time... :-(

FWIW, I can test anything you come up with for the r8a7794 an alt board

   I have remote access to Alt now, in fact using it currently for the AVB work.

or post patches for it once you have r8a7794/silk sorted out.

I already have audio on these working. Or you're going to wait until I fix the SRC issue?

[...]

MBR, Sergei




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