i.MX6 spdif issue on Yocto 3.14.28_1.0.0

[charleshuang]

This is my ALSA device list

[    3.300576] ALSA device list:

[    3.302256]   #0: imx-audio-sgtl5000

[    3.304585]   #1: imx-spdif

[    3.306082]   #2: imx-hdmi-soc

I use gstreamer command to play wav file to spdif

"gst-launch playbin2 uri=file:////test.wav audio-sink="alsasink device=plughw:1"

but it will be stuck, and I can't hear sound from spdif.

If I use "aplay -D plughw:1,0 test.wav", it returns "aplay: pcm_write:1947: write error: Input/output error"

Can you help me to solve this issue?

Thank you.

[behlingc]

I had nearly the same error with the SGTL5000 connected to SSI. It was just that the SDMA script binary blob 'sdma-imx6q.bin' was not loaded correctly by the SDMA driver. Hence, only the ROM scripts were used. After fixing that the error has gone.

[ispsubb]

hi, liqiang . I have the same problem.       L3.14.52  sgtl5000

root@imx6qdlsolo:~# aplay -D hw:0,0  /usr/share/sounds/alsa/Front_Left.wav

Playing WAVE '/usr/share/sounds/alsa/Front_Left.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Mono

aplay: pcm_write:1947: write error: Input/output error

root@imx6qdlsolo:~# cat /proc/asound/cards

0 [imx6qsgtl5000  ]: imx6q-sgtl5000 - imx6q-sgtl5000

                      imx6q-sgtl5000

1 [imxspdif       ]: imx-spdif - imx-spdif

                      imx-spdif

2 [imxhdmisoc     ]: imx-hdmi-soc - imx-hdmi-soc

                      imx-hdmi-soc

I can found the sgtl5000 , but i can not aplay .

[强王]

Dear Huang:

i have the same issue,what should i do

root@imx6qsabresd:~# cat /proc/asound/cards

0 [sgtl5000audio  ]: sgtl5000-audio - sgtl5000-audio

                      sgtl5000-audio

1 [imxspdif       ]: imx-spdif - imx-spdif

                      imx-spdif

root@imx6qsabresd:~# aplay -D hw:1,0 /unit_tests/audio8k16S.wav

Playing WAVE '/unit_tests/audio8k16S.wav' : Signed 16 bit Little Endian, Rate 8000 Hz, Stereo

Warning: rate is not accurate (requested = 8000Hz, got = 32000Hz)

         please, try the plug plugin

aplay: pcm_write:1947: write error: Input/output error

[andreykononov]

decided to look at how to set up access to the spdif-out on other board (hummingboard, cubox-i) and found caption

/* IMX6 doesn't implement this yet */

what that means? IMX6 does not support audio output from spdif-out?

     sound-spdif {           compatible = "fsl,imx-audio-spdif";           model = "imx-spdif";           /* IMX6 doesn't implement this yet */           spdif-controller = <&spdif>;           spdif-out;      };

[qiang_li-mpu_se]

Another change for SPDIF clock is needed:

diff --git a/arch/arm/boot/dts/imx6qdl.dtsi b/arch/arm/boot/dts/imx6qdl.dtsi
index 047aecc..81bfc27 100644
--- a/arch/arm/boot/dts/imx6qdl.dtsi
+++ b/arch/arm/boot/dts/imx6qdl.dtsi
@@ -236,7 +236,7 @@
                                        clocks = <&clks IMX6QDL_CLK_SPDIF_GCLK>, <&clks IMX6QDL_CLK_OSC>,
                                                 <&clks IMX6QDL_CLK_SPDIF>, <&clks IMX6QDL_CLK_ASRC>,
                                                 <&clks IMX6QDL_CLK_DUMMY>, <&clks IMX6QDL_CLK_ESAI_EXTAL>,
-                                                <&clks IMX6QDL_CLK_IPG>, <&clks IMX6QDL_CLK_MLB>,
+                                                <&clks IMX6QDL_CLK_IPG>, <&clks IMX6QDL_CLK_DUMMY>,
                                                 <&clks IMX6QDL_CLK_DUMMY>, <&clks IMX6QDL_CLK_SPBA>;
                                        clock-names = "core",  "rxtx0",
                                                      "rxtx1", "rxtx2",

[yanshiliu]

Hi， as you say, i change  <&clks IMX6QDL_CLK_MLB> to <&clks IMX6QDL_CLK_DUMMY>, the spdif can work well. 

But， Can you explain the reason ? why  IMX6QDL_CLK_MLB not ok ?

[andreykononov]

this is my

                spdif: spdif@02004000 {
                    compatible = "fsl,imx35-spdif";
                    reg = <0x02004000 0x4000>;
                    interrupts = <0 52 IRQ_TYPE_LEVEL_HIGH>;
                    dmas = <&sdma 14 18 0>,
                           <&sdma 15 18 0>;
                    dma-names = "rx", "tx";
                    clocks = <&clks IMX6QDL_CLK_SPDIF_GCLK>, <&clks IMX6QDL_CLK_OSC>,
                         <&clks IMX6QDL_CLK_SPDIF>, <&clks IMX6QDL_CLK_ASRC>,
                         <&clks IMX6QDL_CLK_DUMMY>, <&clks IMX6QDL_CLK_ESAI_EXTAL>,
                         <&clks IMX6QDL_CLK_IPG>, <&clks IMX6QDL_CLK_MLB>,
                         <&clks IMX6QDL_CLK_DUMMY>, <&clks IMX6QDL_CLK_SPBA>;
                    clock-names = "core",  "rxtx0",
                              "rxtx1", "rxtx2",
                              "rxtx3", "rxtx4",
                              "rxtx5", "rxtx6",
                              "rxtx7", "dma";
                    status = "okay";
                };

it doesn't solve problem

[qiang_li-mpu_se]

Change "<&clks IMX6QDL_CLK_IPG>, <&clks IMX6QDL_CLK_MLB>,"

To "<&clks IMX6QDL_CLK_IPG>, <&clks IMX6QDL_CLK_DUMMY>,"

[andreykononov]

great! problem solved

[andreykononov]

have same  problem after setup spdif out

root@imx6qsabreauto:~# aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: cs42888audio [cs42888-audio], device 0: HiFi cs42888-0 []
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: cs42888audio [cs42888-audio], device 1: HiFi-ASRC-FE (*) []
Subdevices: 1/1
Subdevice #0: subdevice #0
card 1: imxspdif [imx-spdif], device 0: S/PDIF PCM snd-soc-dummy-dai-0 []
Subdevices: 1/1
Subdevice #0: subdevice #0
card 2: imxhdmisoc [imx-hdmi-soc], device 0: i.MX HDMI Audio Tx hdmi-hifi-0 []
Subdevices: 1/1
Subdevice #0: subdevice #0

when trying play file through spdif get error

root@imx6qsabreauto:~# aplay -D hw:1,0 /home/root/media/test.wav
Playing WAVE '/home/root/media/test.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo
aplay: pcm_write:1940: write error: Input/output error

root@imx6qsabreauto:~# uname -a
Linux imx6qsabreauto 4.1.26-fslc+g960f493 #1 SMP PREEMPT Wed Aug 24 14:21:51 MSK 2016 armv7l armv7l armv7l GNU/Linux

[qiang_li-mpu_se]

The SPIDF supported TX sample rate has no 8KHz, maybe you can try with other sample rate.

/* SPDIF tx rate */

enum spdif_txrate {

SPDIF_TXRATE_32000 = 0,

SPDIF_TXRATE_44100,

SPDIF_TXRATE_48000,

SPDIF_TXRATE_96000,

SPDIF_TXRATE_192000,

};

[PaulDeMetrotion]

Charles,

Did you ever fix this? I am having the same issue with my SGTL5000 CODEC. I noticed you also used this CODEC and assumed it is working for you.

Here is my ALSA device list:

ALSA device list:

  #0: sgtl5000-audio

  #1: imx-hdmi-soc

I can hear audio through the HDMI channel, but cannot get the SGTL5000 channel to play. Here is the output:

root@imx6qc398:~# aplay -vvv /usr/share/sounds/alsa/Front_Left.wav -Dplughw:0,0

Playing WAVE '/usr/share/sounds/alsa/Front_Left.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Mono

Plug PCM: Hardware PCM card 0 'sgtl5000-audio' device 0 subdevice 0

Its setup is:

  stream       : PLAYBACK

  access       : RW_INTERLEAVED

  format       : S16_LE

  subformat    : STD

  channels     : 1

  rate         : 48000

  exact rate   : 48000 (48000/1)

  msbits       : 16

  buffer_size  : 24000

  period_size  : 6000

  period_time  : 125000

  tstamp_mode  : NONE

  period_step  : 1

  avail_min    : 6000

  period_event : 0

  start_threshold  : 24000

  stop_threshold   : 24000

  silence_threshold: 0

  silence_size : 0

  boundary     : 1572864000

  appl_ptr     : 0

  hw_ptr       : 0

Max peak (6000 samples): 0x000034c8 #########            41%

Max peak (6000 samples): 0x00002e57 ########             36%

Max peak (6000 samples): 0x00001f88 #####                24%

Max peak (6000 samples): 0x000013ef ####                 15%

playback write error (DMA or IRQ trouble?)

aplay: pcm_write:1947: write error: Input/output error

Can you provide any assistance?

[PaulDeMetrotion]

Some additional debug data:

Here is the DMA debug listing. Looks like four DMA transfers are attempted and then everything comes to a halt for 10 seconds before displaying the error message.

root@imx6qc398:~# dmesg | tail

[  635.451027] imx-sdma 20ec000.sdma: wml = 0x0000001a

[  635.451042] imx-sdma 20ec000.sdma: shp_addr = 0x02028000

[  635.451056] imx-sdma 20ec000.sdma: per_addr = 0x00000000

[  635.451070] imx-sdma 20ec000.sdma: event_mask0 = 0x00000000

[  635.451084] imx-sdma 20ec000.sdma: event_mask1 = 0x00000040

[  635.451114] imx-sdma 20ec000.sdma: entry 0: count: 12000 dma: 0x6a2d0000  intr

[  635.451131] imx-sdma 20ec000.sdma: entry 1: count: 12000 dma: 0x6a2d2ee0 intr

[  635.451149] imx-sdma 20ec000.sdma: entry 2: count: 12000 dma: 0x6a2d5dc0  intr

[  635.451169] imx-sdma 20ec000.sdma: entry 3: count: 12000 dma: 0x6a2d8ca0 wrap intr

[  645.453505] playback write error (DMA or IRQ trouble?)

[jimmychan]

this may useful for you.

iMX6 SPDIF issues

[charleshuang]

Hi jimmy

the link you give can't solve my issue, this patch has been in my source code,

What else I can do to solve the problem?

thanks