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1a462be52f
In the commit 8e85def572 ("ALSA: hda: enable regmap internal
locking"), we re-enabled the regmap lock due to the reported
regression that showed the possible concurrent accesses. It was a
temporary workaround, and there are still a few opened races even
after the revert. In this patch, we cover those still opened windows
with a proper mutex lock and disable the regmap internal lock again.
First off, the patch introduces a new snd_hdac_device.regmap_lock
mutex that is applied for each snd_hdac_regmap_*() call, including
read, write and update helpers. The mutex is applied carefully so
that it won't block the self-power-up procedure in the helper
function. Also, this assures the protection for the accesses without
regmap, too.
The snd_hdac_regmap_update_raw() is refactored to use the standard
regmap_update_bits_check() function instead of the open-code. The
non-regmap case is still open-coded but it's an easy part. The all
read and write operations are in the single mutex protection, so it's
now race-free.
In addition, a couple of new helper functions are added:
snd_hdac_regmap_update_raw_once() and snd_hdac_regmap_sync(). Both
are called from HD-audio legacy driver. The former is to initialize
the given verb bits but only once when it's not initialized yet. Due
to this condition, the function invokes regcache_cache_only(), and
it's now performed inside the regmap_lock (formerly it was racy) too.
The latter function is for simply invoking regcache_sync() inside the
regmap_lock, which is called from the codec resume call path.
Along with that, the HD-audio codec driver code is slightly modified /
simplified to adapt those new functions.
And finally, snd_hdac_regmap_read_raw(), *_write_raw(), etc are
rewritten with the helper macro. It's just for simplification because
the code logic is identical among all those functions.
Tested-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Link: https://lore.kernel.org/r/20200109090104.26073-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
226 lines
6.8 KiB
C
226 lines
6.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* HD-audio regmap helpers
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*/
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#ifndef __SOUND_HDA_REGMAP_H
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#define __SOUND_HDA_REGMAP_H
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#include <linux/regmap.h>
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#include <sound/core.h>
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#include <sound/hdaudio.h>
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#define AC_AMP_FAKE_MUTE 0x10 /* fake mute bit set to amp verbs */
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int snd_hdac_regmap_init(struct hdac_device *codec);
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void snd_hdac_regmap_exit(struct hdac_device *codec);
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int snd_hdac_regmap_add_vendor_verb(struct hdac_device *codec,
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unsigned int verb);
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int snd_hdac_regmap_read_raw(struct hdac_device *codec, unsigned int reg,
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unsigned int *val);
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int snd_hdac_regmap_read_raw_uncached(struct hdac_device *codec,
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unsigned int reg, unsigned int *val);
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int snd_hdac_regmap_write_raw(struct hdac_device *codec, unsigned int reg,
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unsigned int val);
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int snd_hdac_regmap_update_raw(struct hdac_device *codec, unsigned int reg,
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unsigned int mask, unsigned int val);
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int snd_hdac_regmap_update_raw_once(struct hdac_device *codec, unsigned int reg,
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unsigned int mask, unsigned int val);
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void snd_hdac_regmap_sync(struct hdac_device *codec);
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/**
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* snd_hdac_regmap_encode_verb - encode the verb to a pseudo register
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* @nid: widget NID
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* @verb: codec verb
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*
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* Returns an encoded pseudo register.
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*/
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#define snd_hdac_regmap_encode_verb(nid, verb) \
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(((verb) << 8) | 0x80000 | ((unsigned int)(nid) << 20))
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/**
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* snd_hdac_regmap_encode_amp - encode the AMP verb to a pseudo register
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* @nid: widget NID
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* @ch: channel (left = 0, right = 1)
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* @dir: direction (#HDA_INPUT, #HDA_OUTPUT)
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* @idx: input index value
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*
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* Returns an encoded pseudo register.
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*/
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#define snd_hdac_regmap_encode_amp(nid, ch, dir, idx) \
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(snd_hdac_regmap_encode_verb(nid, AC_VERB_GET_AMP_GAIN_MUTE) | \
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((ch) ? AC_AMP_GET_RIGHT : AC_AMP_GET_LEFT) | \
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((dir) == HDA_OUTPUT ? AC_AMP_GET_OUTPUT : AC_AMP_GET_INPUT) | \
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(idx))
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/**
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* snd_hdac_regmap_encode_amp_stereo - encode a pseudo register for stereo AMPs
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* @nid: widget NID
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* @dir: direction (#HDA_INPUT, #HDA_OUTPUT)
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* @idx: input index value
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*
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* Returns an encoded pseudo register.
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*/
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#define snd_hdac_regmap_encode_amp_stereo(nid, dir, idx) \
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(snd_hdac_regmap_encode_verb(nid, AC_VERB_GET_AMP_GAIN_MUTE) | \
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AC_AMP_SET_LEFT | AC_AMP_SET_RIGHT | /* both bits set! */ \
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((dir) == HDA_OUTPUT ? AC_AMP_GET_OUTPUT : AC_AMP_GET_INPUT) | \
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(idx))
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/**
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* snd_hdac_regmap_write - Write a verb with caching
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* @nid: codec NID
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* @reg: verb to write
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* @val: value to write
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*
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* For writing an amp value, use snd_hdac_regmap_update_amp().
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*/
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static inline int
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snd_hdac_regmap_write(struct hdac_device *codec, hda_nid_t nid,
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unsigned int verb, unsigned int val)
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{
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unsigned int cmd = snd_hdac_regmap_encode_verb(nid, verb);
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return snd_hdac_regmap_write_raw(codec, cmd, val);
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}
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/**
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* snd_hda_regmap_update - Update a verb value with caching
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* @nid: codec NID
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* @verb: verb to update
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* @mask: bit mask to update
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* @val: value to update
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*
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* For updating an amp value, use snd_hdac_regmap_update_amp().
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*/
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static inline int
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snd_hdac_regmap_update(struct hdac_device *codec, hda_nid_t nid,
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unsigned int verb, unsigned int mask,
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unsigned int val)
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{
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unsigned int cmd = snd_hdac_regmap_encode_verb(nid, verb);
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return snd_hdac_regmap_update_raw(codec, cmd, mask, val);
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}
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/**
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* snd_hda_regmap_read - Read a verb with caching
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* @nid: codec NID
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* @verb: verb to read
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* @val: pointer to store the value
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*
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* For reading an amp value, use snd_hda_regmap_get_amp().
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*/
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static inline int
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snd_hdac_regmap_read(struct hdac_device *codec, hda_nid_t nid,
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unsigned int verb, unsigned int *val)
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{
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unsigned int cmd = snd_hdac_regmap_encode_verb(nid, verb);
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return snd_hdac_regmap_read_raw(codec, cmd, val);
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}
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/**
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* snd_hdac_regmap_get_amp - Read AMP value
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* @codec: HD-audio codec
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* @nid: NID to read the AMP value
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* @ch: channel (left=0 or right=1)
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* @direction: #HDA_INPUT or #HDA_OUTPUT
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* @index: the index value (only for input direction)
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* @val: the pointer to store the value
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*
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* Read AMP value. The volume is between 0 to 0x7f, 0x80 = mute bit.
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* Returns the value or a negative error.
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*/
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static inline int
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snd_hdac_regmap_get_amp(struct hdac_device *codec, hda_nid_t nid,
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int ch, int dir, int idx)
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{
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unsigned int cmd = snd_hdac_regmap_encode_amp(nid, ch, dir, idx);
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int err, val;
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err = snd_hdac_regmap_read_raw(codec, cmd, &val);
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return err < 0 ? err : val;
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}
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/**
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* snd_hdac_regmap_update_amp - update the AMP value
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* @codec: HD-audio codec
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* @nid: NID to read the AMP value
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* @ch: channel (left=0 or right=1)
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* @direction: #HDA_INPUT or #HDA_OUTPUT
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* @idx: the index value (only for input direction)
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* @mask: bit mask to set
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* @val: the bits value to set
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*
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* Update the AMP value with a bit mask.
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* Returns 0 if the value is unchanged, 1 if changed, or a negative error.
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*/
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static inline int
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snd_hdac_regmap_update_amp(struct hdac_device *codec, hda_nid_t nid,
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int ch, int dir, int idx, int mask, int val)
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{
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unsigned int cmd = snd_hdac_regmap_encode_amp(nid, ch, dir, idx);
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return snd_hdac_regmap_update_raw(codec, cmd, mask, val);
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}
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/**
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* snd_hdac_regmap_get_amp_stereo - Read stereo AMP values
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* @codec: HD-audio codec
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* @nid: NID to read the AMP value
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* @ch: channel (left=0 or right=1)
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* @direction: #HDA_INPUT or #HDA_OUTPUT
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* @index: the index value (only for input direction)
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* @val: the pointer to store the value
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*
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* Read stereo AMP values. The lower byte is left, the upper byte is right.
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* Returns the value or a negative error.
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*/
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static inline int
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snd_hdac_regmap_get_amp_stereo(struct hdac_device *codec, hda_nid_t nid,
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int dir, int idx)
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{
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unsigned int cmd = snd_hdac_regmap_encode_amp_stereo(nid, dir, idx);
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int err, val;
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err = snd_hdac_regmap_read_raw(codec, cmd, &val);
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return err < 0 ? err : val;
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}
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/**
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* snd_hdac_regmap_update_amp_stereo - update the stereo AMP value
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* @codec: HD-audio codec
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* @nid: NID to read the AMP value
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* @direction: #HDA_INPUT or #HDA_OUTPUT
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* @idx: the index value (only for input direction)
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* @mask: bit mask to set
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* @val: the bits value to set
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*
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* Update the stereo AMP value with a bit mask.
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* The lower byte is left, the upper byte is right.
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* Returns 0 if the value is unchanged, 1 if changed, or a negative error.
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*/
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static inline int
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snd_hdac_regmap_update_amp_stereo(struct hdac_device *codec, hda_nid_t nid,
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int dir, int idx, int mask, int val)
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{
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unsigned int cmd = snd_hdac_regmap_encode_amp_stereo(nid, dir, idx);
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return snd_hdac_regmap_update_raw(codec, cmd, mask, val);
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}
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/**
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* snd_hdac_regmap_sync_node - sync the widget node attributes
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* @codec: HD-audio codec
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* @nid: NID to sync
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*/
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static inline void
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snd_hdac_regmap_sync_node(struct hdac_device *codec, hda_nid_t nid)
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{
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regcache_mark_dirty(codec->regmap);
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regcache_sync_region(codec->regmap, nid << 20, ((nid + 1) << 20) - 1);
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}
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#endif /* __SOUND_HDA_REGMAP_H */
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