forked from Minki/linux
96e503f900
Current hdac_i915 uses a static completion instance to wait
for i915 driver to complete the component bind.
This design is not safe if multiple HDA controllers are active and
communicating with different i915 instances, and can lead to list
corruption and failed audio driver probe.
Fix the design by moving completion mechanism to common acomp
code and remove the related code from hdac_i915.
Fixes: 7b882fe3e3 ("ALSA: hda - handle multiple i915 device instances")
Co-developed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Link: https://lore.kernel.org/r/20201006161722.500256-1-kai.vehmanen@linux.intel.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
127 lines
3.8 KiB
C
127 lines
3.8 KiB
C
// SPDX-License-Identifier: MIT
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// Copyright © 2014 Intel Corporation
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#ifndef _DRM_AUDIO_COMPONENT_H_
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#define _DRM_AUDIO_COMPONENT_H_
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struct drm_audio_component;
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struct device;
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/**
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* struct drm_audio_component_ops - Ops implemented by DRM driver, called by hda driver
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*/
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struct drm_audio_component_ops {
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/**
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* @owner: drm module to pin down
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*/
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struct module *owner;
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/**
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* @get_power: get the POWER_DOMAIN_AUDIO power well
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*
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* Request the power well to be turned on.
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*
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* Returns a wakeref cookie to be passed back to the corresponding
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* call to @put_power.
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*/
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unsigned long (*get_power)(struct device *);
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/**
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* @put_power: put the POWER_DOMAIN_AUDIO power well
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*
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* Allow the power well to be turned off.
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*/
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void (*put_power)(struct device *, unsigned long);
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/**
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* @codec_wake_override: Enable/disable codec wake signal
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*/
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void (*codec_wake_override)(struct device *, bool enable);
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/**
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* @get_cdclk_freq: Get the Core Display Clock in kHz
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*/
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int (*get_cdclk_freq)(struct device *);
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/**
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* @sync_audio_rate: set n/cts based on the sample rate
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*
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* Called from audio driver. After audio driver sets the
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* sample rate, it will call this function to set n/cts
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*/
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int (*sync_audio_rate)(struct device *, int port, int pipe, int rate);
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/**
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* @get_eld: fill the audio state and ELD bytes for the given port
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*
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* Called from audio driver to get the HDMI/DP audio state of the given
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* digital port, and also fetch ELD bytes to the given pointer.
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*
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* It returns the byte size of the original ELD (not the actually
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* copied size), zero for an invalid ELD, or a negative error code.
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*
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* Note that the returned size may be over @max_bytes. Then it
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* implies that only a part of ELD has been copied to the buffer.
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*/
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int (*get_eld)(struct device *, int port, int pipe, bool *enabled,
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unsigned char *buf, int max_bytes);
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};
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/**
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* struct drm_audio_component_audio_ops - Ops implemented by hda driver, called by DRM driver
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*/
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struct drm_audio_component_audio_ops {
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/**
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* @audio_ptr: Pointer to be used in call to pin_eld_notify
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*/
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void *audio_ptr;
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/**
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* @pin_eld_notify: Notify the HDA driver that pin sense and/or ELD information has changed
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*
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* Called when the DRM driver has set up audio pipeline or has just
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* begun to tear it down. This allows the HDA driver to update its
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* status accordingly (even when the HDA controller is in power save
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* mode).
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*/
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void (*pin_eld_notify)(void *audio_ptr, int port, int pipe);
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/**
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* @pin2port: Check and convert from pin node to port number
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*
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* Called by HDA driver to check and convert from the pin widget node
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* number to a port number in the graphics side.
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*/
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int (*pin2port)(void *audio_ptr, int pin);
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/**
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* @master_bind: (Optional) component master bind callback
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*
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* Called at binding master component, for HDA codec-specific
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* handling of dynamic binding.
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*/
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int (*master_bind)(struct device *dev, struct drm_audio_component *);
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/**
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* @master_unbind: (Optional) component master unbind callback
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*
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* Called at unbinding master component, for HDA codec-specific
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* handling of dynamic unbinding.
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*/
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void (*master_unbind)(struct device *dev, struct drm_audio_component *);
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};
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/**
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* struct drm_audio_component - Used for direct communication between DRM and hda drivers
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*/
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struct drm_audio_component {
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/**
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* @dev: DRM device, used as parameter for ops
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*/
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struct device *dev;
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/**
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* @ops: Ops implemented by DRM driver, called by hda driver
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*/
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const struct drm_audio_component_ops *ops;
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/**
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* @audio_ops: Ops implemented by hda driver, called by DRM driver
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*/
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const struct drm_audio_component_audio_ops *audio_ops;
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/**
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* @master_bind_complete: completion held during component master binding
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*/
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struct completion master_bind_complete;
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};
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#endif /* _DRM_AUDIO_COMPONENT_H_ */
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