imx6 how to disable dma on ssi

[j-g]

Hello,

For experimental reasons I'd like to disable the dma transfers on ssi1 using FIQ instead.  I am able to transfer data out successfully to an SGTL5000 codec (using imx-sgtl5000.c as machine driver) with dma enabled.  The imx6 is the bitclock and frame sync slave.  In the devicetree I added "fsl,fiq-stream-filter" which I see in fsl_ssi.c is checked for and set's  the variable use_dma to false.  Are there any additional things to do besides changing the devicetree to get this to work?  Thank you for any advice.

I'm using freescale linux version 3.14.28

imx6qdl.dtsi =

				ssi1: ssi@02028000 {
					compatible = "fsl,imx6q-ssi","fsl,imx21-ssi";
					reg = <0x02028000 0x4000>;
					interrupts = <0 46 IRQ_TYPE_LEVEL_HIGH>;
					clocks = <&clks IMX6QDL_CLK_SSI1_IPG>,
					<&clks IMX6QDL_CLK_SSI1>;
					clock-names = "ipg", "baud";
					fsl,fiq-stream-filter;
					dmas = <&sdma 37 1 0>,
					<&sdma 38 1 0>;
					dma-names = "rx", "tx";
					fsl,fifo-depth = <15>;
					fsl,ssi-dma-events = <38 37>;
					status = "okay";
				};

[hsl]

hello j-g：

I can now drive the SGTL5000 for recording and playback. How do I use DMA in the SGTL5000 driver?

[kajalsabhani]

i am also having same problem .

can anyone provide solution for the same ?

[alejandrolozan1]

Hi,

According to the code and doducmentation it seems that's all you need.

Can you provide more details about the behavior you are facing?

/Alejandro

[j-g]

Hi Alejandro and thank you for responding,

I am using ssi1 to transmit out to a SGTL5000 codec.  Alsa-utils and Alsa-lib version 1.0.27, fsl-alsa-plugins version 1.0.25.  I did not make any changes to the machine driver or codec.  If I enable dma for my ssi transfers I can do an "aplay -Dhw:0,0 Tone1000.wav" with no issues.  No underruns and sound comes out.  If I put in fsl,fiq-stream-filter as stated above (no other changes), I start getting underruns and no sound.  See below verbose output of aplay.  I'm not running any other programs at that point.  I also did try to change the priority of aplay with nice and got the exact same results.  I can provide any other information needed.  THanks!

root@host:~/test# aplay -vvvv -Dhw:0,0 Tone1000.wav

Playing WAVE 'Tone1000.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Mono

Hardware PCM card 0 'imx6q-qmx6-sgtl5000' device 0 subdevice 0

Its setup is:

  stream       : PLAYBACK

  access       : RW_INTERLEAVED

  format       : S16_LE

  subformat    : STD

  channels     : 1

  rate         : 44100

  exact rate   : 44100 (44100/1)

  msbits       : 16

  buffer_size  : 22052

  period_size  : 5513

  period_time  : 125011

  tstamp_mode  : NONE

  period_step  : 1

  avail_min    : 5513

  period_event : 0

  start_threshold  : 22052

  stop_threshold   : 22052

  silence_threshold: 0

  silence_size : 0

  boundary     : 1445199872

  appl_ptr     : 0

  hw_ptr       : 0

underrun!!! (at least 0.155 ms long)

Status:

  state       : XRUN

  trigger_time: 1432670599.430402342

  tstamp      : 1432670599.430512009

  delay       : 0

  avail       : 22052

  avail_max   : 22052

underrun!!! (at least 0.085 ms long)

Status:

  state       : XRUN

  trigger_time: 1432670599.807962342

  tstamp      : 1432670599.808041675

  delay       : 0

  avail       : 22052

  avail_max   : 22052

underrun!!! (at least 0.090 ms long)

Status:

  state       : XRUN

  trigger_time: 1432670600.185433342

  tstamp      : 1432670600.185518009

  delay       : 0

  avail       : 22052

  avail_max   : 22052

underrun!!! (at least 0.085 ms long)

Status:

  state       : XRUN

  trigger_time: 1432670600.562853675

  tstamp      : 1432670600.562933675

  delay       : 0

  avail       : 22052

  avail_max   : 22052

underrun!!! (at least 0.086 ms long)

Status:

  state       : XRUN

  trigger_time: 1432670600.940244675

  tstamp      : 1432670600.940323675

  delay       : 0

  avail       : 22052

  avail_max   : 22052

underrun!!! (at least 0.087 ms long)

Status:

  state       : XRUN

  trigger_time: 1432670601.317655009

  tstamp      : 1432670601.317736676

  delay       : 0

  avail       : 22052

  avail_max   : 22052

underrun!!! (at least 0.083 ms long)

Status:

  state       : XRUN

  trigger_time: 1432670601.695046342

  tstamp      : 1432670601.695125009

  delay       : 0

  avail       : 22052

  avail_max   : 22052

underrun!!! (at least 0.064 ms long)

Status:

  state       : XRUN

  trigger_time: 1432670602.72451009

  tstamp      : 1432670602.72510009

  delay       : 0

  avail       : 22052

  avail_max   : 22052

underrun!!! (at least 0.089 ms long)

Status:

  state       : XRUN

  trigger_time: 1432670602.449829342

  tstamp      : 1432670602.449913342

  delay       : 0

  avail       : 22052

  avail_max   : 22052

underrun!!! (at least 0.089 ms long)

Status:

  state       : XRUN

  trigger_time: 1432670602.827242342

  tstamp      : 1432670602.827326342

  delay       : 0

  avail       : 22052

  avail_max   : 22052

[j-g]

Here is my /proc/interrupts output:

Interrupt 78 is blank and increments by 11 during each attempt at running aplay so I assume this is somehow related to ssi. 

root@cgtqmx6:/proc# cat interrupts

           CPU0

34:          0       GIC  34  sdma

37:          0       GIC  37  2400000.ipu

38:          4       GIC  38  2400000.ipu

50:          0       GIC  50  vdoa

51:          0       GIC  51  rtc alarm

55:          0       GIC  55  mmc1

56:        528       GIC  56  mmc2

57:          0       GIC  57  mmc3

59:       2300       GIC  59  21e8000.serial

63:          4       GIC  63  2008000.ecspi

65:          0       GIC  65  2010000.ecspi

68:        545       GIC  68  21a0000.i2c

69:        284       GIC  69  21a4000.i2c

70:         78       GIC  70  21a8000.i2c

72:         30       GIC  72  2184200.usb

78:         22       GIC  78

81:          0       GIC  81  imx_thermal

82:          0       GIC  82  asrc

87:      13566       GIC  87  i.MX Timer Tick

112:          0       GIC 112  20bc000.wdog

139:          0       GIC 139  mmdc_1

150:      49111       GIC 150  2188000.ethernet

151:          0       GIC 151  2188000.ethernet

156:          0       GIC 156  20e4000.dcic

157:          0       GIC 157  20e8000.dcic

164:          0  gpio-mxc   4  2194000.usdhc cd

193:          0  gpio-mxc   1  key-menu

194:          0  gpio-mxc   2  key-back

195:          0  gpio-mxc   3  key-search

196:          0  gpio-mxc   4  key-home

198:          0  gpio-mxc   6  219c000.usdhc cd

253:          0  gpio-mxc  29  Power Button

261:          0  gpio-mxc   5  Volume Down

263:          0  gpio-mxc   7  Sleep Button

365:          0  gpio-mxc  13  Volume Up

FIQ:              imx-ssi

IPI0:          0  CPU wakeup interrupts

IPI1:          0  Timer broadcast interrupts

IPI2:          0  Rescheduling interrupts

IPI3:          0  Function call interrupts

IPI4:          0  Single function call interrupts

IPI5:          0  CPU stop interrupts

IPI6:          0  IRQ work interrupts

IPI7:          0  completion interrupts

Err:          0

[j-g]

Does anyone have any examples of using fsl,fiq-stream-filter?