diff options
Diffstat (limited to 'sound/hda/hdac_i915.c')
| -rw-r--r-- | sound/hda/hdac_i915.c | 179 |
1 files changed, 0 insertions, 179 deletions
diff --git a/sound/hda/hdac_i915.c b/sound/hda/hdac_i915.c deleted file mode 100644 index 161a9711cd63..000000000000 --- a/sound/hda/hdac_i915.c +++ /dev/null @@ -1,179 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-or-later -/* - * hdac_i915.c - routines for sync between HD-A core and i915 display driver - */ - -#include <linux/init.h> -#include <linux/module.h> -#include <linux/pci.h> -#include <sound/core.h> -#include <sound/hdaudio.h> -#include <sound/hda_i915.h> -#include <sound/hda_register.h> - -#define IS_HSW_CONTROLLER(pci) (((pci)->device == 0x0a0c) || \ - ((pci)->device == 0x0c0c) || \ - ((pci)->device == 0x0d0c) || \ - ((pci)->device == 0x160c)) - -/** - * snd_hdac_i915_set_bclk - Reprogram BCLK for HSW/BDW - * @bus: HDA core bus - * - * Intel HSW/BDW display HDA controller is in GPU. Both its power and link BCLK - * depends on GPU. Two Extended Mode registers EM4 (M value) and EM5 (N Value) - * are used to convert CDClk (Core Display Clock) to 24MHz BCLK: - * BCLK = CDCLK * M / N - * The values will be lost when the display power well is disabled and need to - * be restored to avoid abnormal playback speed. - * - * Call this function at initializing and changing power well, as well as - * at ELD notifier for the hotplug. - */ -void snd_hdac_i915_set_bclk(struct hdac_bus *bus) -{ - struct drm_audio_component *acomp = bus->audio_component; - struct pci_dev *pci = to_pci_dev(bus->dev); - int cdclk_freq; - unsigned int bclk_m, bclk_n; - - if (!acomp || !acomp->ops || !acomp->ops->get_cdclk_freq) - return; /* only for i915 binding */ - if (!IS_HSW_CONTROLLER(pci)) - return; /* only HSW/BDW */ - - cdclk_freq = acomp->ops->get_cdclk_freq(acomp->dev); - switch (cdclk_freq) { - case 337500: - bclk_m = 16; - bclk_n = 225; - break; - - case 450000: - default: /* default CDCLK 450MHz */ - bclk_m = 4; - bclk_n = 75; - break; - - case 540000: - bclk_m = 4; - bclk_n = 90; - break; - - case 675000: - bclk_m = 8; - bclk_n = 225; - break; - } - - snd_hdac_chip_writew(bus, HSW_EM4, bclk_m); - snd_hdac_chip_writew(bus, HSW_EM5, bclk_n); -} -EXPORT_SYMBOL_GPL(snd_hdac_i915_set_bclk); - -/* returns true if the devices can be connected for audio */ -static bool connectivity_check(struct pci_dev *i915, struct pci_dev *hdac) -{ - struct pci_bus *bus_a = i915->bus, *bus_b = hdac->bus; - - /* directly connected on the same bus */ - if (bus_a == bus_b) - return true; - - /* - * on i915 discrete GPUs with embedded HDA audio, the two - * devices are connected via 2nd level PCI bridge - */ - bus_a = bus_a->parent; - bus_b = bus_b->parent; - if (!bus_a || !bus_b) - return false; - bus_a = bus_a->parent; - bus_b = bus_b->parent; - if (bus_a && bus_a == bus_b) - return true; - - return false; -} - -static int i915_component_master_match(struct device *dev, int subcomponent, - void *data) -{ - struct pci_dev *hdac_pci, *i915_pci; - struct hdac_bus *bus = data; - - if (!dev_is_pci(dev)) - return 0; - - hdac_pci = to_pci_dev(bus->dev); - i915_pci = to_pci_dev(dev); - - if (!strcmp(dev->driver->name, "i915") && - subcomponent == I915_COMPONENT_AUDIO && - connectivity_check(i915_pci, hdac_pci)) - return 1; - - return 0; -} - -/* check whether Intel graphics is present and reachable */ -static int i915_gfx_present(struct pci_dev *hdac_pci) -{ - struct pci_dev *display_dev = NULL; - - for_each_pci_dev(display_dev) { - if (display_dev->vendor == PCI_VENDOR_ID_INTEL && - (display_dev->class >> 16) == PCI_BASE_CLASS_DISPLAY && - connectivity_check(display_dev, hdac_pci)) { - pci_dev_put(display_dev); - return true; - } - } - - return false; -} - -/** - * snd_hdac_i915_init - Initialize i915 audio component - * @bus: HDA core bus - * - * This function is supposed to be used only by a HD-audio controller - * driver that needs the interaction with i915 graphics. - * - * This function initializes and sets up the audio component to communicate - * with i915 graphics driver. - * - * Returns zero for success or a negative error code. - */ -int snd_hdac_i915_init(struct hdac_bus *bus) -{ - struct drm_audio_component *acomp; - int err; - - if (!i915_gfx_present(to_pci_dev(bus->dev))) - return -ENODEV; - - err = snd_hdac_acomp_init(bus, NULL, - i915_component_master_match, - sizeof(struct i915_audio_component) - sizeof(*acomp)); - if (err < 0) - return err; - acomp = bus->audio_component; - if (!acomp) - return -ENODEV; - if (!acomp->ops) { - if (!IS_ENABLED(CONFIG_MODULES) || - !request_module("i915")) { - /* 60s timeout */ - wait_for_completion_killable_timeout(&acomp->master_bind_complete, - msecs_to_jiffies(60 * 1000)); - } - } - if (!acomp->ops) { - dev_info(bus->dev, "couldn't bind with audio component\n"); - snd_hdac_acomp_exit(bus); - return -ENODEV; - } - return 0; -} -EXPORT_SYMBOL_GPL(snd_hdac_i915_init); |