sound/hda/hdac_i915.c

1 // SPDX-License-Identifier: GPL-2.0-or-later
3  *  hdac_i915.c - routines for sync between HD-A core and i915 display driver
9 #include <sound/core.h>
14 #define IS_HSW_CONTROLLER(pci) (((pci)->device == 0x0a0c) || \
15 				((pci)->device == 0x0c0c) || \
16 				((pci)->device == 0x0d0c) || \
17 				((pci)->device == 0x160c))
20  * snd_hdac_i915_set_bclk - Reprogram BCLK for HSW/BDW
21  * @bus: HDA core bus
25  * are used to convert CDClk (Core Display Clock) to 24MHz BCLK:
35 	struct drm_audio_component *acomp = bus->audio_component;  in snd_hdac_i915_set_bclk()
36 	struct pci_dev *pci = to_pci_dev(bus->dev);  in snd_hdac_i915_set_bclk()
40 	if (!acomp || !acomp->ops || !acomp->ops->get_cdclk_freq)  in snd_hdac_i915_set_bclk()
45 	cdclk_freq = acomp->ops->get_cdclk_freq(acomp->dev);  in snd_hdac_i915_set_bclk()
74 /* returns true if the devices can be connected for audio */
77 	struct pci_bus *bus_a = i915->bus, *bus_b = hdac->bus;  in connectivity_check()
84 	 * on i915 discrete GPUs with embedded HDA audio, the two  in connectivity_check()
87 	bus_a = bus_a->parent;  in connectivity_check()
88 	bus_b = bus_b->parent;  in connectivity_check()
91 	bus_a = bus_a->parent;  in connectivity_check()
92 	bus_b = bus_b->parent;  in connectivity_check()
108 	hdac_pci = to_pci_dev(bus->dev);  in i915_component_master_match()
111 	if (!strcmp(dev->driver->name, "i915") &&  in i915_component_master_match()
132  * snd_hdac_i915_init - Initialize i915 audio component
133  * @bus: HDA core bus
135  * This function is supposed to be used only by a HD-audio controller
138  * This function initializes and sets up the audio component to communicate
149 		return -ENODEV;  in snd_hdac_i915_init()
153 				  sizeof(struct i915_audio_component) - sizeof(*acomp));  in snd_hdac_i915_init()
156 	acomp = bus->audio_component;  in snd_hdac_i915_init()
158 		return -ENODEV;  in snd_hdac_i915_init()
159 	if (!acomp->ops) {  in snd_hdac_i915_init()
163 			wait_for_completion_timeout(&acomp->master_bind_complete,  in snd_hdac_i915_init()
167 	if (!acomp->ops) {  in snd_hdac_i915_init()
168 		dev_info(bus->dev, "couldn't bind with audio component\n");  in snd_hdac_i915_init()
170 		return -ENODEV;  in snd_hdac_i915_init()