[3/4] drm/radeon: Add audio component support

Commit Message

Takashi Iwai July 23, 2018, 2:50 p.m. UTC

This patch introduces the HDMI audio component binding like what i915
does to radeon driver.  Unlike i915, we need only the hotplug
notification and the ELD query, hence the code is relatively simple,
just adding the hook at radeon_audio_enable() and giving the eld query
by copying the connector->eld contents.

Signed-off-by: Takashi Iwai <[e-mail]>
---
 drivers/gpu/drm/Kconfig               |  1 +
 drivers/gpu/drm/radeon/radeon.h       |  3 +
 drivers/gpu/drm/radeon/radeon_audio.c | 79 +++++++++++++++++++++++++++
 3 files changed, 83 insertions(+)

Patch

diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
index 2a72d2feb76d..2c7112ddfed4 100644
--- a/drivers/gpu/drm/Kconfig
+++ b/drivers/gpu/drm/Kconfig
@@ -170,6 +170,7 @@  config DRM_RADEON
 	select BACKLIGHT_CLASS_DEVICE
 	select BACKLIGHT_LCD_SUPPORT
 	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 4a2eb409aacc..fad58df0bf19 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"
@@ -1760,6 +1761,8 @@  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 770e31f5fd1b..58e149b7a7a4 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/drmP.h>
 #include <drm/drm_crtc.h>
 #include "radeon.h"
@@ -248,6 +249,7 @@  static void radeon_audio_enable(struct radeon_device *rdev,
 	struct drm_encoder *encoder;
 	struct radeon_encoder *radeon_encoder;
 	struct radeon_encoder_atom_dig *dig;
+	struct drm_audio_component *acomp = rdev->audio.component;
 	int pin_count = 0;
 
 	if (!pin)
@@ -269,6 +271,10 @@  static void radeon_audio_enable(struct radeon_device *rdev,
 
 	if (rdev->audio.funcs->enable)
 		rdev->audio.funcs->enable(rdev, pin, enable_mask);
+
+	if (acomp && acomp->audio_ops && acomp->audio_ops->pin_eld_notify)
+		acomp->audio_ops->pin_eld_notify(acomp->audio_ops->audio_ptr,
+						 pin->id, -1);
 }
 
 static void radeon_audio_interface_init(struct radeon_device *rdev)
@@ -292,6 +298,71 @@  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 = 0;
+	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);
+		*enabled = !!connector;
+		if (connector) {
+			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;
+
+	acomp->ops = &radeon_audio_component_ops;
+	acomp->dev = kdev;
+	rdev->audio.component = acomp;
+	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;
+
+	acomp->ops = NULL;
+	acomp->dev = NULL;
+	rdev->audio.component = NULL;
+}
+
+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 +409,9 @@  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 +564,11 @@  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)