[alsa-devel] [RFC PATCH v3 2/7] drm/i915: Add support for audio driver notifications
Ville Syrjälä
ville.syrjala at linux.intel.com
Mon Nov 28 15:00:08 CET 2016
On Fri, Nov 25, 2016 at 05:51:00AM +0000, Anand, Jerome wrote:
>
>
> > -----Original Message-----
> > From: Ville Syrjälä [mailto:ville.syrjala at linux.intel.com]
> > Sent: Thursday, November 24, 2016 7:03 PM
> > To: Anand, Jerome <jerome.anand at intel.com>
> > Cc: intel-gfx at lists.freedesktop.org; alsa-devel at alsa-project.org;
> > broonie at kernel.org; tiwai at suse.de; pierre-louis.bossart at linux.intel.com;
> > Ughreja, Rakesh A <rakesh.a.ughreja at intel.com>
> > Subject: Re: [RFC PATCH v3 2/7] drm/i915: Add support for audio driver
> > notifications
> >
> > On Fri, Nov 25, 2016 at 05:25:43AM +0530, Jerome Anand wrote:
> > > Notifiations like mode change, hot plug and edid to the audio driver
> > > are added. This is inturn used by the audio driver for its
> > > functionality.
> > >
> > > A new interface file capturing the notifications needed by the audio
> > > driver is added
> > >
> > > Signed-off-by: Pierre-Louis Bossart
> > > <pierre-louis.bossart at linux.intel.com>
> > > Signed-off-by: Jerome Anand <jerome.anand at intel.com>
> > > ---
> > > drivers/gpu/drm/i915/i915_drv.h | 3 +++
> > > drivers/gpu/drm/i915/intel_audio.c | 8 ++++++
> > > drivers/gpu/drm/i915/intel_hdmi.c | 1 +
> > > drivers/gpu/drm/i915/intel_lpe_audio.c | 49
> > ++++++++++++++++++++++++++++++++++
> > > include/drm/intel_lpe_audio.h | 1 +
> > > 5 files changed, 62 insertions(+)
> > >
> > > diff --git a/drivers/gpu/drm/i915/i915_drv.h
> > > b/drivers/gpu/drm/i915/i915_drv.h index 2a79048..33bc44c 100644
> > > --- a/drivers/gpu/drm/i915/i915_drv.h
> > > +++ b/drivers/gpu/drm/i915/i915_drv.h
> > > @@ -3561,6 +3561,9 @@ int intel_lpe_audio_setup(struct
> > > drm_i915_private *dev_priv); void intel_lpe_audio_teardown(struct
> > > drm_i915_private *dev_priv); void intel_lpe_audio_irq_handler(struct
> > > drm_i915_private *dev_priv); bool intel_lpe_audio_detect(struct
> > > drm_i915_private *dev_priv);
> > > +void intel_lpe_audio_notify(struct drm_i915_private *dev_priv,
> > > + void *eld, int port, int tmds_clk_speed,
> > > + bool connected);
> > >
> > > /* intel_i2c.c */
> > > extern int intel_setup_gmbus(struct drm_device *dev); diff --git
> > > a/drivers/gpu/drm/i915/intel_audio.c
> > > b/drivers/gpu/drm/i915/intel_audio.c
> > > index 1c509f7..55a6831 100644
> > > --- a/drivers/gpu/drm/i915/intel_audio.c
> > > +++ b/drivers/gpu/drm/i915/intel_audio.c
> > > @@ -24,6 +24,7 @@
> > > #include <linux/kernel.h>
> > > #include <linux/component.h>
> > > #include <drm/i915_component.h>
> > > +#include <drm/intel_lpe_audio.h>
> > > #include "intel_drv.h"
> > >
> > > #include <drm/drmP.h>
> > > @@ -627,6 +628,10 @@ void intel_audio_codec_enable(struct
> > intel_encoder *intel_encoder,
> > > if (acomp && acomp->audio_ops && acomp->audio_ops-
> > >pin_eld_notify)
> > > acomp->audio_ops->pin_eld_notify(acomp->audio_ops-
> > >audio_ptr,
> > > (int) port, (int) pipe);
> > > +
> > > + if (HAS_LPE_AUDIO(dev_priv))
> > > + intel_lpe_audio_notify(dev_priv, connector->eld, port,
> > > + crtc_state->port_clock, true);
> > > }
> > >
> > > /**
> > > @@ -660,6 +665,9 @@ void intel_audio_codec_disable(struct
> > intel_encoder *intel_encoder)
> > > if (acomp && acomp->audio_ops && acomp->audio_ops-
> > >pin_eld_notify)
> > > acomp->audio_ops->pin_eld_notify(acomp->audio_ops-
> > >audio_ptr,
> > > (int) port, (int) pipe);
> > > +
> > > + if (HAS_LPE_AUDIO(dev_priv))
> > > + intel_lpe_audio_notify(dev_priv, NULL, port, 0, true);
> > > }
> > >
> > > /**
> > > diff --git a/drivers/gpu/drm/i915/intel_hdmi.c
> > > b/drivers/gpu/drm/i915/intel_hdmi.c
> > > index fb88e32..02d50e3 100644
> > > --- a/drivers/gpu/drm/i915/intel_hdmi.c
> > > +++ b/drivers/gpu/drm/i915/intel_hdmi.c
> > > @@ -36,6 +36,7 @@
> > > #include <drm/drm_edid.h>
> > > #include "intel_drv.h"
> > > #include <drm/i915_drm.h>
> > > +#include <drm/intel_lpe_audio.h>
> > > #include "i915_drv.h"
> > >
> > > static struct drm_device *intel_hdmi_to_dev(struct intel_hdmi
> > > *intel_hdmi) diff --git a/drivers/gpu/drm/i915/intel_lpe_audio.c
> > > b/drivers/gpu/drm/i915/intel_lpe_audio.c
> > > index 5335fc6..93f83cb 100644
> > > --- a/drivers/gpu/drm/i915/intel_lpe_audio.c
> > > +++ b/drivers/gpu/drm/i915/intel_lpe_audio.c
> > > @@ -367,3 +367,52 @@ void intel_lpe_audio_teardown(struct
> > > drm_i915_private *dev_priv)
> > >
> > > spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags); }
> > > +
> > > +
> > > +/**
> > > + * intel_lpe_audio_notify() - notify lpe audio event
> > > + * audio driver and i915
> > > + * @dev_priv: the i915 drm device private data
> > > + * @eld : ELD data
> > > + * @port: port id
> > > + * @tmds_clk_speed: tmds clock frequency in Hz
> > > + * @connected: hdmi connected/disconnected
> > > + *
> > > + * Notify lpe audio driver of eld change.
> > > + */
> > > +void intel_lpe_audio_notify(struct drm_i915_private *dev_priv,
> > > + void *eld, int port, int tmds_clk_speed,
> > > + bool connected)
> > > +{
> > > + unsigned long irq_flags;
> > > +
> > > + if (HAS_LPE_AUDIO(dev_priv)) {
> > > + struct intel_hdmi_lpe_audio_pdata *pdata =
> > dev_get_platdata(
> > > + &(dev_priv->lpe_audio.platdev->dev));
> > > +
> > > + if (pdata) {
> >
> > How could the !pdata case happen? If it can't we shouldn't cater for it.
> >
>
> It can happen if there is a notification before audio driver is initialized
You're setting the platform_data in i915 code.
>
> > > + spin_lock_irqsave(&pdata->lpe_audio_slock,
> > > + irq_flags);
> > > +
> > > + if (eld != NULL) {
> > > + memcpy(pdata->eld.eld_data, eld,
> > > + HDMI_MAX_ELD_BYTES);
> > > + pdata->eld.port_id = port;
> > > +
> > > + if (tmds_clk_speed)
> >
> > Why the if?
> >
>
> Tmds of zero is sent in codec_disable. Hence added, just to avoid unnecessary notification to audio driver
I have no idea why hanging on to a bogus tmds clock would prevert
some notification call.
>
> > > + pdata->tmds_clock_speed =
> > > + tmds_clk_speed;
> > > + }
> > > + pdata->hdmi_connected = connected;
> >
> > Also can't really see much need for this. Any one of the port/tmds clock/eld
> > should be sufficient.
>
> Eld and tmds are needed to cater to hotplug and display mode change notifications. Port can be avoided but kept for debug
I don't know what you mean. The ELD/tmds clock should only be needed
when the display is on.
>
> >
> > > + if (pdata->notify_audio_lpe)
> > > + pdata->notify_audio_lpe(
> > > + (eld != NULL) ? &pdata->eld : NULL);
> > > + else
> > > + pdata->notify_pending = true;
> >
> > Still not sure why the "pending" thing is useful. Can't the audio driver just do
> > its thing (whatever it is) unconditionally?
> >
>
> This is added to avoid race when audio driver loads late and the notification from display has already passed.
You keep saying that but I can't see it.
>
> > When disabling just clear the port to INVALID, eld to zero, and tmds clock to
> > 0, and it should all be fine no?
> >
>
> Yes, that's what is being done.
Where?
>
> > > +
> > > + spin_unlock_irqrestore(&pdata->lpe_audio_slock,
> > > + irq_flags);
> > > + } else
> > > + DRM_DEBUG_DRIVER("no audio notification\n");
> > > + }
> > > +}
> > > diff --git a/include/drm/intel_lpe_audio.h
> > > b/include/drm/intel_lpe_audio.h index a64c449..952de05 100644
> > > --- a/include/drm/intel_lpe_audio.h
> > > +++ b/include/drm/intel_lpe_audio.h
> > > @@ -25,6 +25,7 @@
> > > #define _INTEL_LPE_AUDIO_H_
> > >
> > > #include <linux/types.h>
> > > +#include <linux/spinlock_types.h>
> > >
> > > #define HDMI_MAX_ELD_BYTES 128
> > >
> > > --
> > > 2.9.3
> >
> > --
> > Ville Syrjälä
> > Intel OTC
--
Ville Syrjälä
Intel OTC
More information about the Alsa-devel
mailing list