[alsa-devel] [PATCH 0/7] DAPM power sequencing changes
I've implemented what I hope are some improvements to the DAPM power sequence application. Currently when it is implementing power changes DAPM will do one register write per widget. Normally this leads to multiple writes to the same register since power control tends to be clustered in a few registers, slowing things down. This can get noticable on slow or heavily contended buses, especially around resume. The overall effect of these changes is that DAPM will try to minimise the number of register writes it does when implementing power sequences.
As with any substantial change in the power sequencing there is a risk that there may have been some performance regressions on some systems - my biggest concern is that some thing were being helped by the delays introduced by the repeated register writes and may require special handling to fix. My hope is that this won't happen if anything it should fix some problems by ensuring that both left and right channels of stereo paths get powered up together but without wide testing that's hard to guarantee. Any testing that you can do on your systems would be greatly appreciated.
Obviously this is quite an invasive change so I don't intend to submit to ALSA until after the 2.6.31 merge window has closed. The patches can be found here for the time being:
git://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound-2.6.git dapm
Mark Brown (7): ASoC: Sort DAPM power sequences while building lists ASoC: Factor out DAPM sequence execution ASoC: Coalesce register writes for DAPM sequences ASoC: Sort specialised mixers and muxes together ASoC: Coalesce power updates for DAPM widgets with events ASoC: Coalesce power updates for PGAs ASoC: Make DAPM power sequence lists local variables
include/sound/soc.h | 2 - sound/soc/soc-dapm.c | 302 +++++++++++++++++++++++++++++++++++++------------- 2 files changed, 227 insertions(+), 77 deletions(-)
In the past the DAPM power sequencing was done by iterating over the list of widgets once for each widget type and powering widgets of that type. Instead of doing that do the sorting at the time we insert the widgets into the lists of widgets to apply power changes to. This reduces the amount of computation required for seqencing still further, though the costs are generally dwarfed by the costs of the register writes implementing them.
Signed-off-by: Mark Brown broonie@opensource.wolfsonmicro.com --- sound/soc/soc-dapm.c | 109 ++++++++++++++++++++++++++++++++----------------- 1 files changed, 71 insertions(+), 38 deletions(-)
diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c index 21c6907..1b38e21 100644 --- a/sound/soc/soc-dapm.c +++ b/sound/soc/soc-dapm.c @@ -52,19 +52,37 @@
/* dapm power sequences - make this per codec in the future */ static int dapm_up_seq[] = { - snd_soc_dapm_pre, snd_soc_dapm_supply, snd_soc_dapm_micbias, - snd_soc_dapm_mic, snd_soc_dapm_mux, snd_soc_dapm_value_mux, - snd_soc_dapm_dac, snd_soc_dapm_mixer, snd_soc_dapm_mixer_named_ctl, - snd_soc_dapm_pga, snd_soc_dapm_adc, snd_soc_dapm_hp, snd_soc_dapm_spk, - snd_soc_dapm_post + [snd_soc_dapm_pre] = 0, + [snd_soc_dapm_supply] = 1, + [snd_soc_dapm_micbias] = 2, + [snd_soc_dapm_mic] = 3, + [snd_soc_dapm_mux] = 4, + [snd_soc_dapm_value_mux] = 5, + [snd_soc_dapm_dac] = 6, + [snd_soc_dapm_mixer] = 7, + [snd_soc_dapm_mixer_named_ctl] = 8, + [snd_soc_dapm_pga] = 9, + [snd_soc_dapm_adc] = 10, + [snd_soc_dapm_hp] = 11, + [snd_soc_dapm_spk] = 12, + [snd_soc_dapm_post] = 13, };
static int dapm_down_seq[] = { - snd_soc_dapm_pre, snd_soc_dapm_adc, snd_soc_dapm_hp, snd_soc_dapm_spk, - snd_soc_dapm_pga, snd_soc_dapm_mixer_named_ctl, snd_soc_dapm_mixer, - snd_soc_dapm_dac, snd_soc_dapm_mic, snd_soc_dapm_micbias, - snd_soc_dapm_mux, snd_soc_dapm_value_mux, snd_soc_dapm_supply, - snd_soc_dapm_post + [snd_soc_dapm_pre] = 0, + [snd_soc_dapm_adc] = 1, + [snd_soc_dapm_hp] = 2, + [snd_soc_dapm_spk] = 3, + [snd_soc_dapm_pga] = 4, + [snd_soc_dapm_mixer_named_ctl] = 5, + [snd_soc_dapm_mixer] = 6, + [snd_soc_dapm_dac] = 7, + [snd_soc_dapm_mic] = 8, + [snd_soc_dapm_micbias] = 9, + [snd_soc_dapm_mux] = 10, + [snd_soc_dapm_value_mux] = 11, + [snd_soc_dapm_supply] = 12, + [snd_soc_dapm_post] = 13, };
static void pop_wait(u32 pop_time) @@ -738,6 +756,32 @@ static int dapm_power_widget(struct snd_soc_codec *codec, int event, } }
+static int dapm_seq_compare(struct snd_soc_dapm_widget *a, + struct snd_soc_dapm_widget *b, + int sort[]) +{ + if (sort[a->id] != sort[b->id]) + return sort[a->id] - sort[b->id]; + + return 0; +} + +/* Insert a widget in order into a DAPM power sequence. */ +static void dapm_seq_insert(struct snd_soc_dapm_widget *new_widget, + struct list_head *list, + int sort[]) +{ + struct snd_soc_dapm_widget *w; + + list_for_each_entry(w, list, power_list) + if (dapm_seq_compare(new_widget, w, sort) < 0) { + list_add_tail(&new_widget->power_list, &w->power_list); + return; + } + + list_add_tail(&new_widget->power_list, list); +} + /* * Scan each dapm widget for complete audio path. * A complete path is a route that has valid endpoints i.e.:- @@ -752,7 +796,7 @@ static int dapm_power_widgets(struct snd_soc_codec *codec, int event) struct snd_soc_device *socdev = codec->socdev; struct snd_soc_dapm_widget *w; int ret = 0; - int i, power; + int power; int sys_power = 0;
INIT_LIST_HEAD(&codec->up_list); @@ -764,10 +808,10 @@ static int dapm_power_widgets(struct snd_soc_codec *codec, int event) list_for_each_entry(w, &codec->dapm_widgets, list) { switch (w->id) { case snd_soc_dapm_pre: - list_add_tail(&codec->down_list, &w->power_list); + dapm_seq_insert(w, &codec->down_list, dapm_down_seq); break; case snd_soc_dapm_post: - list_add_tail(&codec->up_list, &w->power_list); + dapm_seq_insert(w, &codec->up_list, dapm_up_seq); break;
default: @@ -782,10 +826,11 @@ static int dapm_power_widgets(struct snd_soc_codec *codec, int event) continue;
if (power) - list_add_tail(&w->power_list, &codec->up_list); + dapm_seq_insert(w, &codec->up_list, + dapm_up_seq); else - list_add_tail(&w->power_list, - &codec->down_list); + dapm_seq_insert(w, &codec->down_list, + dapm_down_seq);
w->power = power; break; @@ -802,31 +847,19 @@ static int dapm_power_widgets(struct snd_soc_codec *codec, int event) }
/* Power down widgets first; try to avoid amplifying pops. */ - for (i = 0; i < ARRAY_SIZE(dapm_down_seq); i++) { - list_for_each_entry(w, &codec->down_list, power_list) { - /* is widget in stream order */ - if (w->id != dapm_down_seq[i]) - continue; - - ret = dapm_power_widget(codec, event, w); - if (ret != 0) - pr_err("Failed to power down %s: %d\n", - w->name, ret); - } + list_for_each_entry(w, &codec->down_list, power_list) { + ret = dapm_power_widget(codec, event, w); + if (ret != 0) + pr_err("Failed to power down %s: %d\n", + w->name, ret); }
/* Now power up. */ - for (i = 0; i < ARRAY_SIZE(dapm_up_seq); i++) { - list_for_each_entry(w, &codec->up_list, power_list) { - /* is widget in stream order */ - if (w->id != dapm_up_seq[i]) - continue; - - ret = dapm_power_widget(codec, event, w); - if (ret != 0) - pr_err("Failed to power up %s: %d\n", - w->name, ret); - } + list_for_each_entry(w, &codec->up_list, power_list) { + ret = dapm_power_widget(codec, event, w); + if (ret != 0) + pr_err("Failed to power up %s: %d\n", + w->name, ret); }
/* If we just powered the last thing off drop to standby bias */
Lump the list walk into a single function, and pull in the power application too so we can do some further refactoring. Pure code motion.
Signed-off-by: Mark Brown broonie@opensource.wolfsonmicro.com --- sound/soc/soc-dapm.c | 122 +++++++++++++++++++++++++------------------------- 1 files changed, 61 insertions(+), 61 deletions(-)
diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c index 1b38e21..257d4f1 100644 --- a/sound/soc/soc-dapm.c +++ b/sound/soc/soc-dapm.c @@ -707,55 +707,6 @@ static int dapm_supply_check_power(struct snd_soc_dapm_widget *w) return power; }
-/* - * Scan a single DAPM widget for a complete audio path and update the - * power status appropriately. - */ -static int dapm_power_widget(struct snd_soc_codec *codec, int event, - struct snd_soc_dapm_widget *w) -{ - int ret; - - switch (w->id) { - case snd_soc_dapm_pre: - if (!w->event) - return 0; - - if (event == SND_SOC_DAPM_STREAM_START) { - ret = w->event(w, - NULL, SND_SOC_DAPM_PRE_PMU); - if (ret < 0) - return ret; - } else if (event == SND_SOC_DAPM_STREAM_STOP) { - ret = w->event(w, - NULL, SND_SOC_DAPM_PRE_PMD); - if (ret < 0) - return ret; - } - return 0; - - case snd_soc_dapm_post: - if (!w->event) - return 0; - - if (event == SND_SOC_DAPM_STREAM_START) { - ret = w->event(w, - NULL, SND_SOC_DAPM_POST_PMU); - if (ret < 0) - return ret; - } else if (event == SND_SOC_DAPM_STREAM_STOP) { - ret = w->event(w, - NULL, SND_SOC_DAPM_POST_PMD); - if (ret < 0) - return ret; - } - return 0; - - default: - return dapm_generic_apply_power(w); - } -} - static int dapm_seq_compare(struct snd_soc_dapm_widget *a, struct snd_soc_dapm_widget *b, int sort[]) @@ -782,6 +733,65 @@ static void dapm_seq_insert(struct snd_soc_dapm_widget *new_widget, list_add_tail(&new_widget->power_list, list); }
+/* Apply a DAPM power sequence */ +static void dapm_seq_run(struct snd_soc_codec *codec, struct list_head *list, + int event) +{ + struct snd_soc_dapm_widget *w; + int ret; + + list_for_each_entry(w, list, power_list) { + switch (w->id) { + case snd_soc_dapm_pre: + if (!w->event) + list_for_each_entry_continue(w, list, + power_list); + + if (event == SND_SOC_DAPM_STREAM_START) { + ret = w->event(w, + NULL, SND_SOC_DAPM_PRE_PMU); + if (ret < 0) + pr_err("PRE widget failed: %d\n", + ret); + } else if (event == SND_SOC_DAPM_STREAM_STOP) { + ret = w->event(w, + NULL, SND_SOC_DAPM_PRE_PMD); + if (ret < 0) + pr_err("PRE widget failed: %d\n", + ret); + } + break; + + case snd_soc_dapm_post: + if (!w->event) + list_for_each_entry_continue(w, list, + power_list); + + if (event == SND_SOC_DAPM_STREAM_START) { + ret = w->event(w, + NULL, SND_SOC_DAPM_POST_PMU); + if (ret < 0) + pr_err("POST widget failed: %d\n", + ret); + } else if (event == SND_SOC_DAPM_STREAM_STOP) { + ret = w->event(w, + NULL, SND_SOC_DAPM_POST_PMD); + if (ret < 0) + pr_err("POST widget failed: %d\n", + ret); + } + break; + + default: + ret = dapm_generic_apply_power(w); + if (ret < 0) + pr_err("Failed to apply widget power: %d\n", + ret); + break; + } + } +} + /* * Scan each dapm widget for complete audio path. * A complete path is a route that has valid endpoints i.e.:- @@ -847,20 +857,10 @@ static int dapm_power_widgets(struct snd_soc_codec *codec, int event) }
/* Power down widgets first; try to avoid amplifying pops. */ - list_for_each_entry(w, &codec->down_list, power_list) { - ret = dapm_power_widget(codec, event, w); - if (ret != 0) - pr_err("Failed to power down %s: %d\n", - w->name, ret); - } + dapm_seq_run(codec, &codec->down_list, event);
/* Now power up. */ - list_for_each_entry(w, &codec->up_list, power_list) { - ret = dapm_power_widget(codec, event, w); - if (ret != 0) - pr_err("Failed to power up %s: %d\n", - w->name, ret); - } + dapm_seq_run(codec, &codec->up_list, event);
/* If we just powered the last thing off drop to standby bias */ if (codec->bias_level == SND_SOC_BIAS_PREPARE && !sys_power) {
Reduce the number of register writes we need to set the power state for a CODEC by coalescing updates to widgets with the same sequence order and same register into a single write.
This can be a noticable performance improvement with slow or heavily contended control buses, such as I2C controllers with a low clock frequency, and is particularly noticable when resuming. It can also reduce the noticability of and pops and clicks by ensuring that left and right channels are powered simultaneously if they are in the same register.
Currently widgets that have events are not coalesced, including PGAs which may use the volume ramping control.
Signed-off-by: Mark Brown broonie@opensource.wolfsonmicro.com --- sound/soc/soc-dapm.c | 136 ++++++++++++++++++++++++++++++++++++++------------ 1 files changed, 104 insertions(+), 32 deletions(-)
diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c index 257d4f1..66f07cd 100644 --- a/sound/soc/soc-dapm.c +++ b/sound/soc/soc-dapm.c @@ -713,6 +713,8 @@ static int dapm_seq_compare(struct snd_soc_dapm_widget *a, { if (sort[a->id] != sort[b->id]) return sort[a->id] - sort[b->id]; + if (a->reg != b->reg) + return a->reg - b->reg;
return 0; } @@ -733,63 +735,133 @@ static void dapm_seq_insert(struct snd_soc_dapm_widget *new_widget, list_add_tail(&new_widget->power_list, list); }
-/* Apply a DAPM power sequence */ -static void dapm_seq_run(struct snd_soc_codec *codec, struct list_head *list, - int event) +/* Apply the coalesced changes from a DAPM sequence */ +static void dapm_seq_run_coalesced(struct snd_soc_codec *codec, + struct list_head *pending) { struct snd_soc_dapm_widget *w; + int reg, power; + unsigned int value = 0; + unsigned int mask = 0; + unsigned int cur_mask; + + reg = list_first_entry(pending, struct snd_soc_dapm_widget, + power_list)->reg; + + list_for_each_entry(w, pending, power_list) { + cur_mask = 1 << w->shift; + BUG_ON(reg != w->reg); + + if (w->invert) + power = !w->power; + else + power = w->power; + + mask |= cur_mask; + if (power) + value |= cur_mask; + + pop_dbg(codec->pop_time, + "pop test : Queue %s: reg=0x%x, 0x%x/0x%x\n", + w->name, reg, value, mask); + } + + pop_dbg(codec->pop_time, + "pop test : Applying 0x%x/0x%x to %x in %dms\n", + value, mask, reg, codec->pop_time); + pop_wait(codec->pop_time); + snd_soc_update_bits(codec, reg, mask, value); +} + +/* Apply a DAPM power sequence. + * + * We walk over a pre-sorted list of widgets to apply power to. In + * order to minimise the number of writes to the device required + * multiple widgets will be updated in a single write where possible. + * Currently anything that requires more than a single write is not + * handled. + */ +static void dapm_seq_run(struct snd_soc_codec *codec, struct list_head *list, + int event, int sort[]) +{ + struct snd_soc_dapm_widget *w, *n; + LIST_HEAD(pending); + int cur_sort = -1; + int cur_reg = SND_SOC_NOPM; int ret;
- list_for_each_entry(w, list, power_list) { + list_for_each_entry_safe(w, n, list, power_list) { + ret = 0; + + /* Do we need to apply any queued changes? */ + if (sort[w->id] != cur_sort || w->reg != cur_reg) { + if (!list_empty(&pending)) + dapm_seq_run_coalesced(codec, &pending); + + INIT_LIST_HEAD(&pending); + cur_sort = -1; + cur_reg = SND_SOC_NOPM; + } + switch (w->id) { case snd_soc_dapm_pre: if (!w->event) - list_for_each_entry_continue(w, list, - power_list); + list_for_each_entry_safe_continue(w, n, list, + power_list);
- if (event == SND_SOC_DAPM_STREAM_START) { + if (event == SND_SOC_DAPM_STREAM_START) ret = w->event(w, NULL, SND_SOC_DAPM_PRE_PMU); - if (ret < 0) - pr_err("PRE widget failed: %d\n", - ret); - } else if (event == SND_SOC_DAPM_STREAM_STOP) { + else if (event == SND_SOC_DAPM_STREAM_STOP) ret = w->event(w, NULL, SND_SOC_DAPM_PRE_PMD); - if (ret < 0) - pr_err("PRE widget failed: %d\n", - ret); - } break;
case snd_soc_dapm_post: if (!w->event) - list_for_each_entry_continue(w, list, - power_list); + list_for_each_entry_safe_continue(w, n, list, + power_list);
- if (event == SND_SOC_DAPM_STREAM_START) { + if (event == SND_SOC_DAPM_STREAM_START) ret = w->event(w, NULL, SND_SOC_DAPM_POST_PMU); - if (ret < 0) - pr_err("POST widget failed: %d\n", - ret); - } else if (event == SND_SOC_DAPM_STREAM_STOP) { + else if (event == SND_SOC_DAPM_STREAM_STOP) ret = w->event(w, NULL, SND_SOC_DAPM_POST_PMD); - if (ret < 0) - pr_err("POST widget failed: %d\n", - ret); - } break;
- default: + case snd_soc_dapm_input: + case snd_soc_dapm_output: + case snd_soc_dapm_hp: + case snd_soc_dapm_mic: + case snd_soc_dapm_line: + case snd_soc_dapm_spk: + /* No register support currently */ + case snd_soc_dapm_pga: + /* Don't coalsece these yet due to gain ramping */ ret = dapm_generic_apply_power(w); - if (ret < 0) - pr_err("Failed to apply widget power: %d\n", - ret); break; + + default: + /* If there's an event or an invalid register + * then run immediately, otherwise store the + * updates so that we can coalesce. */ + if (w->reg >= 0 && !w->event) { + cur_sort = sort[w->id]; + cur_reg = w->reg; + list_move(&w->power_list, &pending); + } else { + ret = dapm_generic_apply_power(w); + } } + + if (ret < 0) + pr_err("Failed to apply widget power: %d\n", + ret); } + + if (!list_empty(&pending)) + dapm_seq_run_coalesced(codec, &pending); }
/* @@ -857,10 +929,10 @@ static int dapm_power_widgets(struct snd_soc_codec *codec, int event) }
/* Power down widgets first; try to avoid amplifying pops. */ - dapm_seq_run(codec, &codec->down_list, event); + dapm_seq_run(codec, &codec->down_list, event, dapm_down_seq);
/* Now power up. */ - dapm_seq_run(codec, &codec->up_list, event); + dapm_seq_run(codec, &codec->up_list, event, dapm_up_seq);
/* If we just powered the last thing off drop to standby bias */ if (codec->bias_level == SND_SOC_BIAS_PREPARE && !sys_power) {
The more flexible value muxes and named mixers don't need to be sorted differently from a power management point of view, they are different only in terms of the control interface and not in terms of seqencing behaviour.
Signed-off-by: Mark Brown broonie@opensource.wolfsonmicro.com --- sound/soc/soc-dapm.c | 34 +++++++++++++++++----------------- 1 files changed, 17 insertions(+), 17 deletions(-)
diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c index 66f07cd..9187db1 100644 --- a/sound/soc/soc-dapm.c +++ b/sound/soc/soc-dapm.c @@ -57,15 +57,15 @@ static int dapm_up_seq[] = { [snd_soc_dapm_micbias] = 2, [snd_soc_dapm_mic] = 3, [snd_soc_dapm_mux] = 4, - [snd_soc_dapm_value_mux] = 5, - [snd_soc_dapm_dac] = 6, - [snd_soc_dapm_mixer] = 7, - [snd_soc_dapm_mixer_named_ctl] = 8, - [snd_soc_dapm_pga] = 9, - [snd_soc_dapm_adc] = 10, - [snd_soc_dapm_hp] = 11, - [snd_soc_dapm_spk] = 12, - [snd_soc_dapm_post] = 13, + [snd_soc_dapm_value_mux] = 4, + [snd_soc_dapm_dac] = 5, + [snd_soc_dapm_mixer] = 6, + [snd_soc_dapm_mixer_named_ctl] = 6, + [snd_soc_dapm_pga] = 7, + [snd_soc_dapm_adc] = 8, + [snd_soc_dapm_hp] = 9, + [snd_soc_dapm_spk] = 10, + [snd_soc_dapm_post] = 11, };
static int dapm_down_seq[] = { @@ -75,14 +75,14 @@ static int dapm_down_seq[] = { [snd_soc_dapm_spk] = 3, [snd_soc_dapm_pga] = 4, [snd_soc_dapm_mixer_named_ctl] = 5, - [snd_soc_dapm_mixer] = 6, - [snd_soc_dapm_dac] = 7, - [snd_soc_dapm_mic] = 8, - [snd_soc_dapm_micbias] = 9, - [snd_soc_dapm_mux] = 10, - [snd_soc_dapm_value_mux] = 11, - [snd_soc_dapm_supply] = 12, - [snd_soc_dapm_post] = 13, + [snd_soc_dapm_mixer] = 5, + [snd_soc_dapm_dac] = 6, + [snd_soc_dapm_mic] = 7, + [snd_soc_dapm_micbias] = 8, + [snd_soc_dapm_mux] = 9, + [snd_soc_dapm_value_mux] = 9, + [snd_soc_dapm_supply] = 10, + [snd_soc_dapm_post] = 11, };
static void pop_wait(u32 pop_time)
Signed-off-by: Mark Brown broonie@opensource.wolfsonmicro.com --- sound/soc/soc-dapm.c | 76 +++++++++++++++++++++++++++++++++++++++---------- 1 files changed, 60 insertions(+), 16 deletions(-)
diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c index 9187db1..3fc791c 100644 --- a/sound/soc/soc-dapm.c +++ b/sound/soc/soc-dapm.c @@ -740,7 +740,7 @@ static void dapm_seq_run_coalesced(struct snd_soc_codec *codec, struct list_head *pending) { struct snd_soc_dapm_widget *w; - int reg, power; + int reg, power, ret; unsigned int value = 0; unsigned int mask = 0; unsigned int cur_mask; @@ -764,13 +764,62 @@ static void dapm_seq_run_coalesced(struct snd_soc_codec *codec, pop_dbg(codec->pop_time, "pop test : Queue %s: reg=0x%x, 0x%x/0x%x\n", w->name, reg, value, mask); + + /* power up pre event */ + if (w->power && w->event && + (w->event_flags & SND_SOC_DAPM_PRE_PMU)) { + pop_dbg(codec->pop_time, "pop test : %s PRE_PMU\n", + w->name); + ret = w->event(w, NULL, SND_SOC_DAPM_PRE_PMU); + if (ret < 0) + pr_err("%s: pre event failed: %d\n", + w->name, ret); + } + + /* power down pre event */ + if (!w->power && w->event && + (w->event_flags & SND_SOC_DAPM_PRE_PMD)) { + pop_dbg(codec->pop_time, "pop test : %s PRE_PMD\n", + w->name); + ret = w->event(w, NULL, SND_SOC_DAPM_PRE_PMD); + if (ret < 0) + pr_err("%s: pre event failed: %d\n", + w->name, ret); + } + } + + if (reg >= 0) { + pop_dbg(codec->pop_time, + "pop test : Applying 0x%x/0x%x to %x in %dms\n", + value, mask, reg, codec->pop_time); + pop_wait(codec->pop_time); + snd_soc_update_bits(codec, reg, mask, value); }
- pop_dbg(codec->pop_time, - "pop test : Applying 0x%x/0x%x to %x in %dms\n", - value, mask, reg, codec->pop_time); - pop_wait(codec->pop_time); - snd_soc_update_bits(codec, reg, mask, value); + list_for_each_entry(w, pending, power_list) { + /* power up post event */ + if (w->power && w->event && + (w->event_flags & SND_SOC_DAPM_POST_PMU)) { + pop_dbg(codec->pop_time, "pop test : %s POST_PMU\n", + w->name); + ret = w->event(w, + NULL, SND_SOC_DAPM_POST_PMU); + if (ret < 0) + pr_err("%s: post event failed: %d\n", + w->name, ret); + } + + /* power down post event */ + if (!w->power && w->event && + (w->event_flags & SND_SOC_DAPM_POST_PMD)) { + pop_dbg(codec->pop_time, "pop test : %s POST_PMD\n", + w->name); + ret = w->event(w, NULL, SND_SOC_DAPM_POST_PMD); + if (ret < 0) + pr_err("%s: post event failed: %d\n", + w->name, ret); + } + } }
/* Apply a DAPM power sequence. @@ -843,16 +892,11 @@ static void dapm_seq_run(struct snd_soc_codec *codec, struct list_head *list, break;
default: - /* If there's an event or an invalid register - * then run immediately, otherwise store the - * updates so that we can coalesce. */ - if (w->reg >= 0 && !w->event) { - cur_sort = sort[w->id]; - cur_reg = w->reg; - list_move(&w->power_list, &pending); - } else { - ret = dapm_generic_apply_power(w); - } + /* Queue it up for application */ + cur_sort = sort[w->id]; + cur_reg = w->reg; + list_move(&w->power_list, &pending); + break; }
if (ret < 0)
Handle gain ramping for PGAs so we can coalesce their power updates too. This is not ideal since we can't cope properly with gain ramping for stereo paths but that was the case without coalescing and gain ramping is relatively infrequently used so the effects are limited.
Signed-off-by: Mark Brown broonie@opensource.wolfsonmicro.com --- sound/soc/soc-dapm.c | 10 ++++++++-- 1 files changed, 8 insertions(+), 2 deletions(-)
diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c index 3fc791c..7299ce4 100644 --- a/sound/soc/soc-dapm.c +++ b/sound/soc/soc-dapm.c @@ -786,6 +786,10 @@ static void dapm_seq_run_coalesced(struct snd_soc_codec *codec, pr_err("%s: pre event failed: %d\n", w->name, ret); } + + /* Lower PGA volume to reduce pops */ + if (w->id == snd_soc_dapm_pga && !w->power) + dapm_set_pga(w, w->power); }
if (reg >= 0) { @@ -797,6 +801,10 @@ static void dapm_seq_run_coalesced(struct snd_soc_codec *codec, }
list_for_each_entry(w, pending, power_list) { + /* Raise PGA volume to reduce pops */ + if (w->id == snd_soc_dapm_pga && w->power) + dapm_set_pga(w, w->power); + /* power up post event */ if (w->power && w->event && (w->event_flags & SND_SOC_DAPM_POST_PMU)) { @@ -886,8 +894,6 @@ static void dapm_seq_run(struct snd_soc_codec *codec, struct list_head *list, case snd_soc_dapm_line: case snd_soc_dapm_spk: /* No register support currently */ - case snd_soc_dapm_pga: - /* Don't coalsece these yet due to gain ramping */ ret = dapm_generic_apply_power(w); break;
They are now only accessed within dapm_power_widgets() so can be local to that function.
Signed-off-by: Mark Brown broonie@opensource.wolfsonmicro.com --- include/sound/soc.h | 2 -- sound/soc/soc-dapm.c | 19 ++++++++----------- 2 files changed, 8 insertions(+), 13 deletions(-)
diff --git a/include/sound/soc.h b/include/sound/soc.h index cf6111d..5964dd6 100644 --- a/include/sound/soc.h +++ b/include/sound/soc.h @@ -369,8 +369,6 @@ struct snd_soc_codec { enum snd_soc_bias_level bias_level; enum snd_soc_bias_level suspend_bias_level; struct delayed_work delayed_work; - struct list_head up_list; - struct list_head down_list;
/* codec DAI's */ struct snd_soc_dai *dai; diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c index 7299ce4..1c30da1 100644 --- a/sound/soc/soc-dapm.c +++ b/sound/soc/soc-dapm.c @@ -927,23 +927,22 @@ static int dapm_power_widgets(struct snd_soc_codec *codec, int event) { struct snd_soc_device *socdev = codec->socdev; struct snd_soc_dapm_widget *w; + LIST_HEAD(up_list); + LIST_HEAD(down_list); int ret = 0; int power; int sys_power = 0;
- INIT_LIST_HEAD(&codec->up_list); - INIT_LIST_HEAD(&codec->down_list); - /* Check which widgets we need to power and store them in * lists indicating if they should be powered up or down. */ list_for_each_entry(w, &codec->dapm_widgets, list) { switch (w->id) { case snd_soc_dapm_pre: - dapm_seq_insert(w, &codec->down_list, dapm_down_seq); + dapm_seq_insert(w, &down_list, dapm_down_seq); break; case snd_soc_dapm_post: - dapm_seq_insert(w, &codec->up_list, dapm_up_seq); + dapm_seq_insert(w, &up_list, dapm_up_seq); break;
default: @@ -958,11 +957,9 @@ static int dapm_power_widgets(struct snd_soc_codec *codec, int event) continue;
if (power) - dapm_seq_insert(w, &codec->up_list, - dapm_up_seq); + dapm_seq_insert(w, &up_list, dapm_up_seq); else - dapm_seq_insert(w, &codec->down_list, - dapm_down_seq); + dapm_seq_insert(w, &down_list, dapm_down_seq);
w->power = power; break; @@ -979,10 +976,10 @@ static int dapm_power_widgets(struct snd_soc_codec *codec, int event) }
/* Power down widgets first; try to avoid amplifying pops. */ - dapm_seq_run(codec, &codec->down_list, event, dapm_down_seq); + dapm_seq_run(codec, &down_list, event, dapm_down_seq);
/* Now power up. */ - dapm_seq_run(codec, &codec->up_list, event, dapm_up_seq); + dapm_seq_run(codec, &up_list, event, dapm_up_seq);
/* If we just powered the last thing off drop to standby bias */ if (codec->bias_level == SND_SOC_BIAS_PREPARE && !sys_power) {
participants (1)
-
Mark Brown