test-case: manual: Simple probes functionality test

Signed-off-by: Jyri Sarha <jyri.sarha@intel.com>

Author: jsarha

test-case/manual/check-simple-probe-capture.md

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+# Probes test
+Simple probes functionality test.
+
+# Preconditions
+1. Linux kernel should have these config options enabled:
+   CONFIG_SND_SOC_SOF_DEBUG_PROBES=y
+   CONFIG_SND_SOC_SOF_HDA_PROBES=y
+
+   These options are not user selectable and can not be enabled with
+   'make menuconfig'. Edit .config manually instead.
+
+2. Firmware should have these config options enabled:
+   CONFIG_PROBE=y
+
+   The following defaults are Ok:
+   CONFIG_PROBE_POINTS_MAX=16
+   CONFIG_PROBE_DMA_MAX=4
+
+   In fact PROBE_DMA_MAX is ignored as inection is not currently supported
+
+2. Enable the module, by creating file /etc/modprobe.d/sof-probes.conf, with
+   following line as content:
+   options snd_sof_probes enable=1
+
+3. Add following line to /etc/modprobe.d/sof.conf:
+   options snd slots=,,,snd_sof_probes
+
+   to make the sound card for the probes to be locked at card3.
+
+4. Have tiny compress installed:
+   git clone https://github.com/alsa-project/tinycompress.git
+   sudo ./gitcompile --prefix= $OUT
+   sudo make install
+
+5. Have sof-probes from sof/tools/probes installed
+
+
+# Test Description
+* Enable probe capture, start playback, bind the probe capture to a buffer
+  in playback pipeline, convert the capture to wav, verify the wav contains
+  the content played.
+
+  The probes functionality is described in more generic way here:
+  https://github.com/thesofproject/sof-docs/blob/master/developer_guides/debugability/probes/index.rst
+
+# Simple probe capture case
+## Check preconditions
+1. Look for comprY under /proc/asound/cardX/, you should find for example:
+   /proc/asound/card3/compr0/
+2. Check that you have a working tiny compress "crecord" binary available.
+3. Check that you have a working sof tools "sof-probes" binary available.
+
+## Run Instructions
+1. Start a capture on probe alsa device (3 and 0 are from
+   /proc/asound/card3/compr0):
+   ```
+   crecord -c3 -d0 -b8192 -f4 -FS32_LE -R48000 -C4 /tmp/extract.wav
+   ```
+2. Start a playback
+   ```
+   aplay -Dplughw:0,0 test.wav -v -q
+   ```
+
+3. Bind probe capture to a buffer on playback pipeline (as super user):
+   ```
+   echo 36,1,0 >  /sys/kernel/debug/sof/probe_points
+   ```
+   The first number refers to the playback buffer being captured (it should be
+   found from the topology), second tells its a capture (always 1 as insertion
+   is not supported), and the last number is ignored in capture case.
+
+4. See that the probes capture file is growing:
+   ```
+   ls -l /tmp/extract.wav
+   ```   
+
+5. Convert the captured file to a regular wav-file:
+   ```
+   sof-probes -p /tmp/extract.wav
+   ```
+
+6. Check that the resulting wav-file resembles the one that was being played
+   during the capture:
+   ```
+   aplay -Dplughw:0,0 buffer_36.wav -v -q
+   ```