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Re: linux-fsl 5.10 kernels don't appear to have multi-lane in sound/soc/fsl/fsl_sai.c

Brian Hutchinson
 



On Wed, Oct 27, 2021 at 8:18 AM Fabio Estevam <festevam@...> wrote:
Hi Brian,

On Tue, Oct 26, 2021 at 11:10 AM Brian Hutchinson <b.hutchman@...> wrote:
>
>
>
> On Tue, Oct 26, 2021 at 10:07 AM Brian Hutchinson via lists.yoctoproject.org <b.hutchman=gmail.com@...> wrote:
>>
>> Hi,
>>
>> First, forgive me for posting a link in an post with no context ... I hit a wrong button and accidentally sent before ready.
>>
>> Bottom line up front.  How can I get a 5.10 kernel with multi-lane support for IMX8MM?
>>
>> We use linux-fsl 5.4 on a IMXMM based board and have recently stepped up to linux-fsl 5.10 and the sound/fsl/fsl_sai.c has no support for "multi-lane" anymore which breaks our code.
>>
>> I figure this is simply a case where things in linux-imx are new and just not picked up in linux-fslc yet but wondering if it's possible to get multi-lane support in a 5.10 kernel for the IMX8MM.
>>
>> I still don't quite fully understand how all the releases work, the linux-imx releases appear to be for newer boards and don't necessarily support the older boards from what I'm seeing.
>>
>> Thanks for any advice/guidance.
>>
>> Regards,
>>
>> Brian
>
>
> And that link I accidentally posted by itself https://source.codeaurora.org/external/imx/linux-imx/tree/sound/soc/fsl/fsl_sai.c?h=lf-5.10.y
>
> ... is the reference I mentioned where I see multi-lane support in linux-imx 5.10.

With the mainline SAI driver, it is possible to use several channels.
Not sure what you mean by "multi-lane" in your use-case.

Please check:
https://bootlin.com/blog/eight-channels-audio-on-i-mx7-with-pcm3168/

I hoped folks would know what I was talking about without getting too far into the weeds.  But I guess I need to explain more.

The older 5.4 kernels (and even 4 series kernels) had a imx8mm-evk.dts sai section that looked like this:

&sai1 {
       pinctrl-names = "default";
       pinctrl-0 = <&pinctrl_sai1>;
       assigned-clocks = <&clk IMX8MM_CLK_SAI1>;
       assigned-clock-parents = <&clk IMX8MM_AUDIO_PLL1_OUT>;
       assigned-clock-rates = <24576000>;
       clocks = <&clk IMX8MM_CLK_SAI1_IPG>, <&clk IMX8MM_CLK_DUMMY>,
               <&clk IMX8MM_CLK_SAI1_ROOT>, <&clk IMX8MM_CLK_DUMMY>,
               <&clk IMX8MM_CLK_DUMMY>, <&clk IMX8MM_AUDIO_PLL1_OUT>,
               <&clk IMX8MM_AUDIO_PLL2_OUT>;
       clock-names = "bus", "mclk0", "mclk1", "mclk2", "mclk3", "pll8k", "pll11k";
       fsl,sai-multi-lane;
       fsl,dataline,dsd = <0 0xff 0xff 2 0xff 0x11>;
       fsl,sai-synchronous-rx;
       dmas = <&sdma2 0 25 0>, <&sdma2 1 25 0>;
       #sound-dai-cells = <0>;
       status = "okay";
};

... which has fsl,sai-multi-lane support.

The current linux-fslc 5.10 kernel does not have fsl,sai-multi-lane support.

If you look at the linux-imx 5.10 link I posted before ... they do have the multi-lane support I'm looking for (in sounds/soc/fsl/fsl_sai.c) but kinda don't want to switch back to linux-imx.  So my ask is how can I get linux-fslc 5.10 with multi-lane support?

Apparently the yocto build has changed again.  It used to be linux-imx was built by default, now it looks like linux-fslc is built by default even when I check out NXP's latest harpoon release which was supposed to have 5.10 ... and it does have recipes for 5.10 but 5.4 linux-fslc builds by default so I got some catching up to do to figure out how to select between the various kernels but I'm getting into side issues.

My main need is getting fsl,sai-multi-lane back in linux-fslc 5.10 since we moved away from linux-imx over a year ago.

Hopefully that better explains where I'm coming from and what my issue is.

Regards,

Brian
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