imx8qx sai0 output problem

draven — Thu, 25 Mar 2021 10:47:12 GMT

Hi all,

I have a new problem. Can you help me?

I am trying to work imx8qx's sai0 output. At software side everything looks fine. But I cannot any signal sai0's output with oscilloscope. My working stages at below.

Our imx8qx's sai0 pins connect to tas2770 codec. And i2c connect to tas2270 and i2c works.
Our using kernel version is = 5.4.y-1.0.0. This kernel doesn't have tas2770 driver. For that I use ti's official driver and port to our current kernel. (driver = https://git.ti.com/cgit/tas2770sw-android/tas2770sw-android/) (git = https://git.ti.com/git/tas2770sw-android/tas2770sw-android.git). We can comminucate with tas2770 with i2c. Our porting diff file attached.
Then I configure my device-tree :

sound { compatible = "simple-audio-card"; simple-audio-card,bitclock-master = <&dailink_master>; simple-audio-card,format = "i2s"; simple-audio-card,frame-master = <&dailink_master>; simple-audio-card,name = "tas2770-Audio"; dailink_master: simple-audio-card,codec { sound-dai = <&codec>; clocks = <&mclkout0_lpcg 0>; }; cpusai: simple-audio-card,cpu { sound-dai = <&sai0>; dai-tdm-slot-num = <2>; dai-tdm-slot-width = <32>; }; }; &i2c1 { codec: tas2770@41 { compatible = "ti,tas2770"; #sound-dai-cells = <0>; assigned-clocks = <&clk IMX_SC_R_AUDIO_PLL_0 IMX_SC_PM_CLK_PLL>, <&clk IMX_SC_R_AUDIO_PLL_0 IMX_SC_PM_CLK_SLV_BUS>, <&clk IMX_SC_R_AUDIO_PLL_0 IMX_SC_PM_CLK_MST_BUS>, <&mclkout0_lpcg 0>; assigned-clock-rates = <786432000>, <49152000>, <12000000>, <12000000>; clocks = <&mclkout0_lpcg 0>; clock-names = "mclk"; reg = <0x41>; ti,asi-format = <0>; ti,left-slot = <0>; ti,right-slot = <1>; ti,imon-slot-no = <0>; ti,vmon-slot-no = <2>; #address-cells = <1>; #size-cells = <0>; ti,reset-gpio = <&portexp 19 GPIO_ACTIVE_LOW>; ti,irq-gpio = <&lsio_gpio3 0 GPIO_ACTIVE_LOW>; }; }; &sai0 { #sound-dai-cells = <0>; pinctrl-names = "default"; pinctrl-0 = <&pinctrl_sai0>; status = "okay"; fsl,sai-asynchronous; }; pinctrl_sai0: sai0grp { fsl,pins = < IMX8QXP_SPI0_SDI_ADMA_SAI0_TXD 0x06000040 IMX8QXP_SPI0_SCK_ADMA_SAI0_TXC 0x06000040 IMX8QXP_SPI0_SDO_ADMA_SAI0_TXFS 0x06000040 >; };

Before sai0's pins connect to M40_GPIO0_IO03 at my mex file. For be sure I can pinmux, I added pad_force_mux to scfw file. My scfw diff is :

@@ -252,6 +252,20 @@ void board_init(boot_phase_t phase) /* Configure SNVS button timing (ON->OFF 5s, OFF->ON 100ms) */ SNVS_ButtonTime(SNVS_DRV_BTN_ON_100MS, SNVS_DRV_BTN_DEBOUNCE_100MS, SNVS_DRV_BTN_PRESS_5S); + pad_force_mux(SC_P_SPI0_SDO, 1, SC_PAD_CONFIG_OUT_IN, + SC_PAD_ISO_OFF); + + pad_force_mux(SC_P_SPI0_SCK, 1, SC_PAD_CONFIG_OUT_IN, + SC_PAD_ISO_OFF); + + pad_force_mux(SC_P_SPI0_SDI, 1, SC_PAD_CONFIG_OUT_IN, + SC_PAD_ISO_OFF); + + pad_force_mux(SC_P_SPI0_CS0, 1, SC_PAD_CONFIG_OUT_IN, + SC_PAD_ISO_OFF); + + board_print(3, "%s(BOOT_PHASE_FINAL_INIT SAI pins configurated - %u)\n", __func__, (unsigned)phase); + break; case BOOT_PHASE_TEST_INIT: /* Init HW required for unit tests */ board_print(3, "%s(BOOT_PHASE_TEST_INIT - %u)\n", __func__, (unsigned)phase);

And for be sure m4 cortex not effect to sai pin's I generate new flash.bin from mkimage without m4 image. (make SOC=iMX8QX flash) / (flash -> SCU + AP)
Lastly everything looks fine at userspace :

root@tqma8xqp-mba8xx:~# dmesg | grep tas27 [ 2.219460] tas2770 16-0041: tas2770_i2c_probe enter [ 2.224527] tas2770 16-0041: ti,asi-format=0 [ 2.224551] tas2770 16-0041: ti,reset-gpio=507 [ 2.224568] tas2770 16-0041: ti,irq-gpio=96 [ 2.224574] tas2770 16-0041: ti,left-slot=0 [ 2.224580] tas2770 16-0041: ti,right-slot=1 [ 2.224586] tas2770 16-0041: ti,imon-slot-no=0 [ 2.224592] tas2770 16-0041: ti,vmon-slot-no=2 [ 2.224610] tas2770 16-0041: irq = 233 [ 2.261280] tas2770 16-0041: tas2770_register_codec, enter [ 3.716892] tas2770 16-0041: tas2770_codec_probe [ 3.721583] tas2770 16-0041: tas2770_codec_read, reg: 0xc, value: 0xa [ 3.721593] tas2770 16-0041: tas2770_codec_read, reg: 0xc, value: 0xa [ 3.721602] tas2770 16-0041: tas2770_codec_read, reg: 0xc, value: 0xa [ 3.721610] tas2770 16-0041: tas2770_codec_read, reg: 0xc, value: 0xa [ 3.721623] tas2770 16-0041: tas2770_codec_read, reg: 0x2, value: 0xe [ 3.721632] tas2770 16-0041: tas2770_codec_read, reg: 0x2, value: 0xe [ 3.721641] debugfs: Directory '59040000.sai' with parent 'tas2770-Audio' already present! [ 3.729954] tas2770 16-0041: tas2770_set_dai_fmt, format=0x1001 [ 3.729960] tas2770 16-0041: ASI format master is not found [ 3.735543] tas2770 16-0041: INV format: NBNF [ 3.735551] tas2770 16-0041: tas2770_codec_read, reg: 0xb, value: 0x2 [ 3.735558] tas2770 16-0041: tas2770_codec_read, reg: 0xb, value: 0x2 [ 3.735565] tas2770 16-0041: tas2770_codec_read, reg: 0xd, value: 0x10 [ 3.735571] tas2770 16-0041: tas2770_codec_read, reg: 0xd, value: 0x10 [ 3.735578] tas2770 16-0041: tas2770_codec_read, reg: 0xd, value: 0x10 [ 3.735583] tas2770 16-0041: slot value: 0x10 [ 3.735667] asoc-simple-card sound: tas2770 ASI1 <-> 59040000.sai mapping ok [ 3.748553] tas2770 16-0041: tas2770_codec_read, reg: 0x2, value: 0xe [ 3.748584] tas2770 16-0041: tas2770_codec_read, reg: 0x2, value: 0xe [ 4.114813] #0: tas2770-Audio [ 8.532424] tas2770 16-0041: tas2770_codec_read, reg: 0x3, value: 0x10 [ 8.537366] tas2770 16-0041: tas2770_codec_write, reg: 0x3, 0x14 [ 8.537509] tas2770 16-0041: tas2770_codec_read, reg: 0x5, value: 0x0 [ 8.537546] tas2770 16-0041: tas2770_codec_read, reg: 0xc, value: 0xa [ 8.537573] tas2770 16-0041: tas2770_codec_read, reg: 0xc, value: 0xa [ 8.537880] tas2770 16-0041: tas2770_codec_write, reg: 0xc, 0x1a [ 8.537923] tas2770 16-0041: tas2770_codec_read, reg: 0x2, value: 0xe [ 8.537956] tas2770 16-0041: tas2770_codec_read, reg: 0x2, value: 0xe [ 8.599187] tas2770 16-0041: tas2770_codec_read, reg: 0x3, value: 0x14 [ 8.599235] tas2770 16-0041: tas2770_codec_read, reg: 0x5, value: 0x0 [ 8.599266] tas2770 16-0041: tas2770_codec_read, reg: 0xc, value: 0x1a [ 8.599290] tas2770 16-0041: tas2770_codec_read, reg: 0x2, value: 0xe [ 8.599313] tas2770 16-0041: tas2770_codec_read, reg: 0x2, value: 0xe

root@tqma8xqp-mba8xx:~# aplay -L null Discard all samples (playback) or generate zero samples (capture) sysdefault:CARD=tas2770Audio tas2770-Audio, Default Audio Device usbstream:CARD=tas2770Audio tas2770-Audio USB Stream Output

root@tqma8xqp-mba8xx:~# speaker-test speaker-test 1.1.9 Playback device is default Stream parameters are 48000Hz, S16_LE, 1 channels Using 16 octaves of pink noise Rate set to 48000Hz (requested 48000Hz) Buffer size range from 3840 to 5760 Period size range from 1920 to 1920 Using max buf[f e r20 s7i.z7e6 09577610] tPaesr27i7od0s 1=6- 400 4w1a:s isrqet_ wpoerrki_ordou_stiiznee = 1920 was set buffer_size = 5760 0 - Front Left [ 207.775724] tas2770 16-0041: IRQ status : 0x4, 0x0

I cannot see any digital signal at my som's sai0 pins via oscilloscope.

I wam waiting for your helps.

Thanks.

Re: imx8qx sai0 output problem

igorpadykov — Thu, 25 Mar 2021 11:41:37 GMT

Hi yildizberat

one can look at wm8960 example

https://source.codeaurora.org/external/imx/linux-imx/tree/arch/arm64/boot/dts/freescale/imx8qxp-mek-sof-wm8960.dts?h=imx_5.4.70_2.3.0

and Figure 27. ALSA SoC Software Architecture i.MX Linux Reference Manual

Best regards
igor

Re: imx8qx sai0 output problem

draven — Fri, 02 Apr 2021 10:26:07 GMT

I wrote a simple machine driver and now it works.

Re: imx8qx sai0 output problem

giuseppepagano1 — Fri, 07 May 2021 15:40:28 GMT

Hi,

I think I have the same problem:

On a custom board I'm using a really simple codec (sgtl5000), connected via sai0 to an imx8qxp soc.

My audio codec plays well with 4.19 kernel, but with Yocto kernel 5.4.70 I can't see any signal (clock and data) on I2S bus.

At boot my codec is correctly recognized and linked to the sai0 controller.

With 5.4 kernel I can run "aplay test.vaw", but using the scope I can't see any signal at all.

Can you please clarify what have you correct in your machine driver ?

Really many thanks in advance.

Giuseppe

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