ALSA: hda: Update documentation for aliasing via the model option

The previous patch allowed user to specify the aliasing of SSID via
model option for applying a quirk.  Update the documentation
accordingly.

Link: https://lore.kernel.org/r/20210823073722.14873-4-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 11 insertions, 0 deletions

diff --git a/Documentation/sound/hd-audio/notes.rst b/Documentation/sound/hd-audio/notes.rst
index cf4d7158af78..d118b6fe269b 100644
--- a/Documentation/sound/hd-audio/notes.rst
+++ b/Documentation/sound/hd-audio/notes.rst
@@ -215,6 +215,17 @@ There are a few special model option values:
 * when ``generic`` is passed, the codec-specific parser is skipped and
   only the generic parser is used.
 
+A new style for the model option that was introduced since 5.15 kernel
+is to pass the PCI or codec SSID in the form of ``model=XXXX:YYYY``
+where XXXX and YYYY are the sub-vendor and sub-device IDs in hex
+numbers, respectively.  This is a kind of aliasing to another device;
+when this form is given, the driver will refer to that SSID as a
+reference to the quirk table.  It'd be useful especially when the
+target quirk isn't listed in the model table.  For example, passing
+model=103c:8862 will apply the quirk for HP ProBook 445 G8 (which
+isn't found in the model table as of writing) as long as the device is
+handled equivalently by the same driver.
+
 
 Speaker and Headphone Output
 ----------------------------