Now that everything is in place let's register a PCM device for
each port of the display engine. This will make it possible to
actually output audio to multiple displays at the same time. And
it avoids modesets on unrelated displays from clobbering up the
ELD and whatnot for the display currently doing the playback.

v2: Add a PCM per port instead of per pipe
v3: Fix off by one error with port numbers (Pierre-Louis)
    Fix .notify_audio_lpe() prototype (Pierre-Louis)

Cc: Takashi Iwai <tiwai@suse.de>
Cc: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170427160231.13337-12-ville.syrjala@linux.intel.comReviewed-by: NTakashi Iwai <tiwai@suse.de>

To allow multiple PCM devices to be registered for the LPE audio card,
split the private data into card and PCM specific chunks. For now we'll
stick to just one PCM device as before.

v2: Rework to do a pcm device per port instead of per pipe

Cc: Takashi Iwai <tiwai@suse.de>
Cc: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170427160231.13337-11-ville.syrjala@linux.intel.comReviewed-by: NTakashi Iwai <tiwai@suse.de>

This patch implements a jack interface for notifying HDMI/DP
connection.  PA listens to this, so it can handle the monitor
connection more gracefully.
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

The pcm_stream_info.running field is only set in the PCM trigger
callback but never referred, thus it can be safely removed.

Also, properly cover the spinlock in both the trigger START and STOP
to protect had_enable_audio() calls.
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

Currently the driver handles some reset procedure at the trigger STOP
and the underrun functions, where both are executed in the interrupt
context.  Especially the underrun function has a sync-loop to clear
the UNDERRUN status bit, and this is supposed to be one of plausible
causes of GPU hangup.

Since the job to be done in the interrupt handler should be minimum,
we move the reset function out of trigger and underrun, and push it
into the prepare (and hw_free) callbacks instead.  Here a new flag,
need_reset, is introduced to indicate the requirement of the reset
procedure.  This is for avoiding the multiple resets when PCM prepare
is called sequentially.

Also in the UNDERRUN bit-clear sync loop, take a longer pause to be in
the safer side.  Taking a longer delay is no longer a problem now
because we're running in the normal context.
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

At enabling the audio, we modify AUD_CONFIG register bit 0.  So far,
it does read-modify-write procedure with a special hack for the
channel bits due to the silicon bug.  But we can optimize it by
remembering the AUD_CONFIG register value privately.  This simplifies
the things a lot.
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

We have two header files and everything is mixed up chaotically.
Move the chip-specific definitions like the hardware registers to
intel_hdmi_lpe_audio.h, and the rest, the implementation specific
stuff into intel_hdmi_audio.h.

In addition, put some more comments to the register fields, and fix
the incorrect name prefix for AUD_HDMI_STATUS bits, too.

The whole changes are merely a code shuffling, and there is no
functional change.
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

This is again a big rewrite of the driver; now it touches the code to
process PCM stream transfers.

The most fundamental change is that the driver may support more than
four periods.  Instead of keeping the same index between both the ring
buffer (with the fixed four buffer descriptors) and the PCM buffer
periods, we keep difference indices for both (bd_head and pcm_head
fields).  In addition, when the periods are more than four, we need to
track both head and next indices.  That is, we now have three indices:
bd_head, pcm_head and pcm_filled.

Also, the driver works better for periods < 4, too: the remaining BDs
out of four are marked as invalid, so that the hardware skips those
BDs in its loop.

By this flexibility, we can use even ALSA-lib dmix plugin, which
requires 16 periods as default.

The buffer size could be up to 20bit, so the max buffer size was
increased accordingly.  However, the buffer pre-allocation is kept as
the old value (600kB) as default.  The reason is the limited number of
BDs: since it doesn't suffice for the useful SG page management that
can fit with the usual page allocator like some other drivers, we have
to still allocate continuous pages, hence we shouldn't take too big
memories there.
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

After the rewrite of the runtime PM code, we have only two driver
status: CONNECTED and DISCONNECTED.  So it's clearer to use a boolean
flag, and name it easier one, "connected".
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

Many defines and constants are left unused.  Clean them up.
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

Currently each register definition contains the own prefix in the
union struct itself; for example, union aud_ch_status_0 has
status_0_regx and status_0_regval fields.  These are simply
superfluous, since usually the type of the variable is seen in its
declaration or in its name.

In this patch, we cut off these prefixes.  Now all register
definitions have regx and regval fields consistently, instead.
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

We have some constants defined in drm/drm_edid.h, and clean up our own
definitions.
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

The only remaining field in struct had_stream_data is stream_type that
holds the current stream status.  Such information fits better in
struct pcm_stream_info, so move it as a boolean "running" field to be
clearer.

This allows us to get rid or had_stream_data definition and
references.

Also, the superfluous status check get removed in a couple of places
where we can call PCM helpers in anyway.
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

The PCM substream is referred not only in the PCM callbacks but also
in the irq handler and in the hotplug/unplug codes.  The latter code
paths don't take the PCM lock, thus the PCM may be released
unexpectedly while calling PCM helper functions or accessing
pcm->runtime fields.

This patch implements a simple refcount to assure the PCM substream
accessibility while the other codes are accessing.  It needed some
code refactoring in the relevant functions for avoiding the doubly
spinlocks.
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

The struct pcm_stream_info contains a few unused or useless fields.
str_id is always zero, buffer_ptr is volatile, never read, and sfreq
is nowhere referred.  Kill them.
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

The had_stream_pvt struct assigned to PCM runtime private data tracks
merely the stream running status, and the very same information is
carried by had_stream->stream_type.  Kill it.
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

The state field keeps the connection state and it's basically as same
as drv_status field.  Drop this redundancy.
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

The flag_underrun flag is used to indicate to escalate the XRUN
reporting at the next position inquiry, but there is a much simpler
method to achieve it: just call snd_pcm_stop_xrun().
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

The access to chmap can be racy against the hotplug process, where it
recreates the chmap on the fly.  For protecting against it, a mutex is
introduced in this patch.  It's also used for protecting the change /
reference of eld and state fields, too.
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

Although we dropped the most of the obsoleted *_v1 definitions and
codes, some codes still keep the _v1 or _v2 suffices.  Now they are
ripped off.

The only thing to be done carefully here is the definition of control
offsets.  The original code defines enum hdmi_ctrl_reg_offset_v1 and
a few new elements just for v2 on its top.  After this cleanup, we
remove the old AUD_HDMI_STATUS and AUD_HDMIW_INFOFR definitions and
replace with the v2 values.
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

Also change the flag_underrun to bool to be clearer.
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

Again another indirect call...  Let's straighten it up.
Also define the had_stream field with a proper type instead of a void
pointer.
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

As the very last step, we fold intel_hdmi_audio_if.c into the main
file, intel_hdmi_audio.c.  This is merely a cleanup, and no functional
change.

By this move, we can mark all functions and variables as static, which
allows the compiler more optimizations.
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

This is the final stage for a big clean-up series.  Here we flatten
the two layers into one.  Formerly, the implementation was split to
HDMI "shell" that talks with the platform device, and HDMI audio part
that communicates via caps and other event handlers.  All these would
be good if there were multiple instantiations or if there were data
protection.  But neither are true in our case.  That said, it'll be
easier to have a flat driver structure in the end.

In this patch, the former struct hdmi_lpe_audio_ctx is forged into the
existing struct snd_intelhad.  The latter has already a few members
that are basically the copy from the former.  Only a few new members
for the lowlevel I/O are added by this change.

Then, the had_get_caps() and had_set_caps() are simply replaced with
the direct calls to copy the data in the struct fields.  Also, the
had_event_handler() calls are replaced with the direct call for each
event as well.
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

It's used nowhere.  Kill it.
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

Instead of allocating snd_intelhad struct, use the card's private_data
and embed it.  It simplifies the code a lot.

While we're at it, embed had_stream into snd_intelhad struct instead
of individually allocating, and rename had_pvt_data to a bit more
specific name, had_stream_data.
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

It's nowhere used.  Let's drop it.
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

The last one is in intel_hdmi_audio.c, underrun_count: this can be
embedded in snd_intelhad object.
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

Currently the driver calls the event callback stored in its ctx
pointer, but it's obviously inefficient.  Replace it with the direct
calls.
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

For reducing the global variable reference, keep snd_intelhad object
in the context and pass it to each helper.  It's a preliminary change
for further cleanup.

This also includes the simplification of the probe procedure: the LPE
platform driver directly gets the created snd_intelhad object by
hdmi_audio_probe(), and passes it to each helper and destructor,
hdmi_audio_remove().  The hdmi_audio_probe() function doesn't call the
back-registration any longer, which is fairly useless.  The LPE
platform driver initializes the stuff instead at the right place, and
calls the wq after the object creation in the probe function itself.
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

Yet another indirection is killed: at this time, it's
snd_intel_had_interface.  It contains also the name string, but it's
nowhere used, thus we can kill it, too.
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

Like the previous patch, this replaces the indirect query_ops calls
via direct function calls.  They are only get_caps and set_caps, so
fairly straightforward at this time.
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

Now about the indirect register ops: they are replaced with direct
calls, too.

The read / write / modify ops are simply replaced with the
corresponding functions.  The difference is that we calculate the
offset inside the function now.  So all the had_config_offset
references in the caller side are dropped.  This also simplifies the
DP-audio check in hdmi_audio_write() and hdmi_audio_rmw().

The hdmi_audio_get_register_base is dropped since it's no longer used
when the base address and config offset are referred in the read/write
functions.
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

We have only a single implementation of had_ops, hence there is no
merit to use the indirect calls at all.  Let's replace it with the
direct calls -- which allows the compiler more optimizations.
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

Imported from legacy patches

Note: the new code doesn't assume a modified ELD but
an explicit notification that DP is present. It appears
that the i915 code does change the ELD so we could use
the ELD-based tests to check for DP audio
Signed-off-by: NPierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

Hdmi audio driver based on the child platform device
created by gfx driver is implemented.
This audio driver is derived from legacy intel
hdmi audio driver.

The interfaces for interaction between gfx and audio
are updated and the driver implementation updated to
derive interrupts in its own address space based on
irq chip framework

The changes to calculate sub-period positions was triggered
by David Henningsson <david.henningsson@canonical.com> and is
accomodated in this patch
Signed-off-by: NPierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: NJerome Anand <jerome.anand@intel.com>
Signed-off-by: NTakashi Iwai <tiwai@suse.de>