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>
15 static int gpu_bind = -1;
18 			   "(1=always, 0=never, -1=on nomodeset(default))");
21  * snd_hdac_i915_set_bclk - Reprogram BCLK for HSW/BDW
22  * @bus: HDA core bus
26  * are used to convert CDClk (Core Display Clock) to 24MHz BCLK:
36 	struct drm_audio_component *acomp = bus->audio_component;  in snd_hdac_i915_set_bclk()
37 	struct pci_dev *pci = to_pci_dev(bus->dev);  in snd_hdac_i915_set_bclk()
41 	if (!acomp || !acomp->ops || !acomp->ops->get_cdclk_freq)  in snd_hdac_i915_set_bclk()
46 	cdclk_freq = acomp->ops->get_cdclk_freq(acomp->dev);  in snd_hdac_i915_set_bclk()
75 /* returns true if the devices can be connected for audio */
78 	struct pci_bus *bus_a = i915->bus, *bus_b = hdac->bus;  in connectivity_check()
84 	bus_a = bus_a->parent;  in connectivity_check()
85 	bus_b = bus_b->parent;  in connectivity_check()
95 	 * on i915 discrete GPUs with embedded HDA audio, the two  in connectivity_check()
98 	bus_a = bus_a->parent;  in connectivity_check()
99 	bus_b = bus_b->parent;  in connectivity_check()
115 	hdac_pci = to_pci_dev(bus->dev);  in i915_component_master_match()
118 	if ((!strcmp(dev->driver->name, "i915") ||  in i915_component_master_match()
119 		 !strcmp(dev->driver->name, "xe")) &&  in i915_component_master_match()
136 		if (display_dev->vendor == PCI_VENDOR_ID_INTEL &&  in i915_gfx_present()
137 		    (display_dev->class >> 16) == PCI_BASE_CLASS_DISPLAY &&  in i915_gfx_present()
148  * snd_hdac_i915_init - Initialize i915 audio component
149  * @bus: HDA core bus
151  * This function is supposed to be used only by a HD-audio controller
154  * This function initializes and sets up the audio component to communicate
164 	if (!i915_gfx_present(to_pci_dev(bus->dev)))  in snd_hdac_i915_init()
165 		return -ENODEV;  in snd_hdac_i915_init()
169 				  sizeof(struct i915_audio_component) - sizeof(*acomp));  in snd_hdac_i915_init()
172 	acomp = bus->audio_component;  in snd_hdac_i915_init()
174 		return -ENODEV;  in snd_hdac_i915_init()
175 	if (!acomp->ops) {  in snd_hdac_i915_init()
177 		return dev_err_probe(bus->dev, -EPROBE_DEFER,  in snd_hdac_i915_init()
178 				     "couldn't bind with audio component\n");  in snd_hdac_i915_init()