Re: [PATCH 1/2] drm/radeon: Add HD-audio component notifier support

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On Mon, Jul 22, 2019 at 10:38 AM Takashi Iwai <tiwai@xxxxxxx> wrote:
>
> This patch adds the support for the notification of HD-audio hotplug
> via the already existing drm_audio_component framework to radeon
> driver.  This allows us more reliable hotplug notification and ELD
> transfer without accessing HD-audio bus; it's more efficient, and more
> importantly, it works without waking up the runtime PM.
>
> The implementation is rather simplistic: radeon driver provides the
> get_eld ops for HD-audio, and it notifies the audio hotplug via
> pin_eld_notify callback upon each radeon_audio_enable() call.
> The pin->id is referred as the port number passed to the notifier
> callback, and the corresponding connector is looked through the
> encoder list in the get_eld callback in turn.
>
> The bind and unbind callbacks handle the device-link so that it
> assures the PM call order.
>
> Acked-by: Jim Qu <Jim.Qu@xxxxxxx>
> Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>

Acked-by: Alex Deucher <alexander.deucher@xxxxxxx>

> ---
>  drivers/gpu/drm/Kconfig               |  1 +
>  drivers/gpu/drm/radeon/radeon.h       |  3 ++
>  drivers/gpu/drm/radeon/radeon_audio.c | 92 +++++++++++++++++++++++++++++++++++
>  3 files changed, 96 insertions(+)
>
> diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
> index 1d80222587ad..8b44cc458830 100644
> --- a/drivers/gpu/drm/Kconfig
> +++ b/drivers/gpu/drm/Kconfig
> @@ -209,6 +209,7 @@ config DRM_RADEON
>         select HWMON
>         select BACKLIGHT_CLASS_DEVICE
>         select INTERVAL_TREE
> +       select SND_HDA_COMPONENT if SND_HDA_CORE
>         help
>           Choose this option if you have an ATI Radeon graphics card.  There
>           are both PCI and AGP versions.  You don't need to choose this to
> diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
> index 32808e50be12..2973284b7961 100644
> --- a/drivers/gpu/drm/radeon/radeon.h
> +++ b/drivers/gpu/drm/radeon/radeon.h
> @@ -75,6 +75,7 @@
>  #include <drm/ttm/ttm_execbuf_util.h>
>
>  #include <drm/drm_gem.h>
> +#include <drm/drm_audio_component.h>
>
>  #include "radeon_family.h"
>  #include "radeon_mode.h"
> @@ -1761,6 +1762,8 @@ struct r600_audio {
>         struct radeon_audio_funcs *hdmi_funcs;
>         struct radeon_audio_funcs *dp_funcs;
>         struct radeon_audio_basic_funcs *funcs;
> +       struct drm_audio_component *component;
> +       bool component_registered;
>  };
>
>  /*
> diff --git a/drivers/gpu/drm/radeon/radeon_audio.c b/drivers/gpu/drm/radeon/radeon_audio.c
> index b9aea5776d3d..976502e31c43 100644
> --- a/drivers/gpu/drm/radeon/radeon_audio.c
> +++ b/drivers/gpu/drm/radeon/radeon_audio.c
> @@ -23,6 +23,7 @@
>   */
>
>  #include <linux/gcd.h>
> +#include <linux/component.h>
>
>  #include <drm/drm_crtc.h>
>  #include "radeon.h"
> @@ -242,6 +243,14 @@ static struct radeon_audio_funcs dce6_dp_funcs = {
>         .dpms = evergreen_dp_enable,
>  };
>
> +static void radeon_audio_component_notify(struct drm_audio_component *acomp,
> +                                         int port)
> +{
> +       if (acomp && acomp->audio_ops && acomp->audio_ops->pin_eld_notify)
> +               acomp->audio_ops->pin_eld_notify(acomp->audio_ops->audio_ptr,
> +                                                port, -1);
> +}
> +
>  static void radeon_audio_enable(struct radeon_device *rdev,
>                                 struct r600_audio_pin *pin, u8 enable_mask)
>  {
> @@ -269,6 +278,8 @@ static void radeon_audio_enable(struct radeon_device *rdev,
>
>         if (rdev->audio.funcs->enable)
>                 rdev->audio.funcs->enable(rdev, pin, enable_mask);
> +
> +       radeon_audio_component_notify(rdev->audio.component, pin->id);
>  }
>
>  static void radeon_audio_interface_init(struct radeon_device *rdev)
> @@ -292,6 +303,79 @@ static void radeon_audio_interface_init(struct radeon_device *rdev)
>         }
>  }
>
> +static int radeon_audio_component_get_eld(struct device *kdev, int port,
> +                                         int pipe, bool *enabled,
> +                                         unsigned char *buf, int max_bytes)
> +{
> +       struct drm_device *dev = dev_get_drvdata(kdev);
> +       struct drm_encoder *encoder;
> +       struct radeon_encoder *radeon_encoder;
> +       struct radeon_encoder_atom_dig *dig;
> +       struct drm_connector *connector;
> +       int ret = 0;
> +
> +       *enabled = false;
> +       list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
> +               if (!radeon_encoder_is_digital(encoder))
> +                       continue;
> +               radeon_encoder = to_radeon_encoder(encoder);
> +               dig = radeon_encoder->enc_priv;
> +               if (!dig->pin || dig->pin->id != port)
> +                       continue;
> +               connector = radeon_get_connector_for_encoder(encoder);
> +               if (connector) {
> +                       *enabled = true;
> +                       ret = drm_eld_size(connector->eld);
> +                       memcpy(buf, connector->eld, min(max_bytes, ret));
> +                       break;
> +               }
> +       }
> +
> +       return ret;
> +}
> +
> +static const struct drm_audio_component_ops radeon_audio_component_ops = {
> +       .get_eld = radeon_audio_component_get_eld,
> +};
> +
> +static int radeon_audio_component_bind(struct device *kdev,
> +                                      struct device *hda_kdev, void *data)
> +{
> +       struct drm_device *dev = dev_get_drvdata(kdev);
> +       struct radeon_device *rdev = dev->dev_private;
> +       struct drm_audio_component *acomp = data;
> +
> +       if (WARN_ON(!device_link_add(hda_kdev, kdev, DL_FLAG_STATELESS)))
> +               return -ENOMEM;
> +
> +       drm_modeset_lock_all(dev);
> +       acomp->ops = &radeon_audio_component_ops;
> +       acomp->dev = kdev;
> +       rdev->audio.component = acomp;
> +       drm_modeset_unlock_all(dev);
> +
> +       return 0;
> +}
> +
> +static void radeon_audio_component_unbind(struct device *kdev,
> +                                         struct device *hda_kdev, void *data)
> +{
> +       struct drm_device *dev = dev_get_drvdata(kdev);
> +       struct radeon_device *rdev = dev->dev_private;
> +       struct drm_audio_component *acomp = data;
> +
> +       drm_modeset_lock_all(dev);
> +       rdev->audio.component = NULL;
> +       acomp->ops = NULL;
> +       acomp->dev = NULL;
> +       drm_modeset_unlock_all(dev);
> +}
> +
> +static const struct component_ops radeon_audio_component_bind_ops = {
> +       .bind   = radeon_audio_component_bind,
> +       .unbind = radeon_audio_component_unbind,
> +};
> +
>  static int radeon_audio_chipset_supported(struct radeon_device *rdev)
>  {
>         return ASIC_IS_DCE2(rdev) && !ASIC_IS_NODCE(rdev);
> @@ -338,6 +422,9 @@ int radeon_audio_init(struct radeon_device *rdev)
>         for (i = 0; i < rdev->audio.num_pins; i++)
>                 radeon_audio_enable(rdev, &rdev->audio.pin[i], 0);
>
> +       if (!component_add(rdev->dev, &radeon_audio_component_bind_ops))
> +               rdev->audio.component_registered = true;
> +
>         return 0;
>  }
>
> @@ -490,6 +577,11 @@ void radeon_audio_fini(struct radeon_device *rdev)
>                 radeon_audio_enable(rdev, &rdev->audio.pin[i], 0);
>
>         rdev->audio.enabled = false;
> +
> +       if (rdev->audio.component_registered) {
> +               component_del(rdev->dev, &radeon_audio_component_bind_ops);
> +               rdev->audio.component_registered = false;
> +       }
>  }
>
>  static void radeon_audio_set_dto(struct drm_encoder *encoder, unsigned int clock)
> --
> 2.16.4
>
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