i.MX ProcessorsのトピックRe: imx6q codec / esai, clock issues

imx6q codec / esai, clock issues

angelo_d — Tue, 07 Jul 2015 16:17:26 GMT

Hi,

upgrading from kernel 3.10.17 to 3.14.28 on similar sabreauto borard, i get this warning for the audio codec cs42888 / esai interface

fsl-esai-dai 2024000.esai: failed to derive required HCKT rate

fsl-esai-dai 2024000.esai: the ratio is out of range, 0 (2 ~ 65536)

fsl-esai-dai 2024000.esai: ASoC: 2024000.esai hw params failed: -22

Is there any main difference on clocks in the new kernel that i have to take in account ?

Thanks

angelo

Re: imx6q codec / esai, clock issues

jimmychan — Tue, 14 Jul 2015 04:50:26 GMT

you can see the different from the log.

http://git.freescale.com/git/cgit.cgi/imx/linux-2.6-imx.git/log/sound/soc/fsl/fsl_esai.c?h=imx_3.10.17_1.0.0_ga

http://git.freescale.com/git/cgit.cgi/imx/linux-2.6-imx.git/log/sound/soc/fsl/fsl_esai.c?h=imx_3.14.28_1.0.0_ga

Re: imx6q codec / esai, clock issues

angelo_d — Wed, 15 Jul 2015 09:50:04 GMT

Thanks,

changes are many.

I am looking into the 3.14.28 sabreauto dtsi, that have same cs42888 to imx6q wirings as in my board, and there are changes inside the &esai { } section,

but if i reflect them on my board i still have similar issues:

fsl_esai_set_dai_sysclk clk_rate 30000000

changes to

fsl_esai_set_dai_sysclk clk_rate 24000000

About this error:

fsl-esai-dai 2024000.esai: failed to derive required HCKT rate

It is not clear why HCKT have to be set internally. I am in slave mode, since external master clock (24576000) is provided to cs42888 and it should act as master.

Re: imx6q codec / esai, clock issues

angelo_d — Wed, 15 Jul 2015 19:52:07 GMT

I solved.

my issues was related to a devicetree node name different from sabreauto devicetree:

clocks {
        codec_osc: anaclk2 {
            compatible = "fixed-clock";
            #clock-cells = <0>;
            clock-frequency = <24576000>;
        };
    };

Note, the naming must repsect "anaclk2" or there is no link with anaclk2 clock.