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>

Although the driver has some PM callbacks, it doesn't do it right:
- the suspend callback doesn't handle to suspend the running PCM,
- the runtime PM ops are missing,
- pm_runtime_get_sync() isn't used at the right place.

This patch covers the above and provides the basic runtime PM
functionality.
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>

We don't need to use irqsave/irqrestore versions for each spin lock,
but judge the context properly and use the simpler versions.

Also add some (still simplistic) comments to functions.
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

Some tables can be defined as const.
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>

Clean up codes, fix indentations, correct comments, etc.
No functional change.
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

The helper function isn't clearer than the plain condition check
"if (drv_status == HDA_DRV_DISCONNECTED)".  By expanding this, the
compiler could even catch the possible uninitialized cases, so we
could fix them, too.
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

The had_get_hwstate() is identical with drv_status==DISCONECTED, which
was already checked before the call.  And, returning an error at
resume is simply bad.  That is, we should just kill this check.

Also, spewing an error at resume for drv_status!=SUSPENDED is also
annoying, as this is the normal case when the suspend was called
without the monitor connection.  Make it debug, too.
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

i915 notification is executed in a spinlock, thus it must not sleep;
i.e. we can't use kmalloc with GFP_KERNEL or such.

For making it working properly, move the notification handler in a
work, and handle it gracefully.  We have already such a work, and it
was used just at the start.  This can be re-used in a more generic
hotplug handling.

Also, the patch adds the proper call of cancel_work_sync() to the
destructor.
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

snd_pcm_lib_preallocate_free_for_all() doesn't have to be called from
each driver as it's called in the PCM core.
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>

The direct access to power.runtime_status is taboo, let's use a helper
macro to avoid the compile error with CONFIG_PM=n.
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

dev_xxx() helpers give a tidier output in general.

While we're at it, remove many useless debug prints (e.g. the ones at
each function entry), replace some too verbose errors with debugs, and
use WARN_ON() for some serious errors.
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>

The card registration should be done at the last stage of the probe
procedure.  Otherwise user-space may access to the device before the
whole initialization is done.
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 belongs to the right place.

And, remove a few sanity checks (e.g. NULL card) and debug prints as
well.
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>

Instead of referring to the global hlpe_pdev variable, pass the
platform device object to each function properly.  Accessing to the
global object is really ugly and error-prone.
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>

had_mutex is (supposedly) used to protect the concurrent calls of
hdmi_audio_probe().  But we may have only one device at most, so it's
utterly useless.  Drop it.
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>

The v1 code refers to Medfield/Clovertrail.  It's not used at all in
the current driver, and probably won't be ever.  Let's clean this up,
then we can go to the next stage of cleanup tasks.
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>

When the display resolution changes, the drm disables the
display pipes due to which audio rendering stops. At this
time, we need to ensure the existing audio pointers and
buffers are cleared out so that the playback can restarted
once the display pipe is enabled with a different N/CTS values
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>