Re: [alsa-devel] [PATCH] ASoC: Remove special casing for registerless widgets

On Sat, Apr 02, 2011 at 03:49:01PM +0800, Mark Brown wrote:

Since we recently explicitly set the register for registerless widgets to no register there is no longer any need to special case power updates for them, we can allow them to be handled with the register compression code as other widgets are.

As this is the only remaining user of dapm_generic_apply_power() and dapm_update_bits() also remove those functions.

Noticed-by: Lu Guanqun guanqun.lu@intel.com Signed-off-by: Mark Brown broonie@opensource.wolfsonmicro.com

---

Compile tested only currently, sending it out now as part of discussion with Lu Guanqun.

I see the point what you were saying.

But I still don't quite understand the write compression, it aims at reducing the number of register writes, however in dapm_seq_run_coalesced, it calls snd_soc_update_bits.

Could you explain a little bit? It's appreciated. I'm vauge in this part.

sound/soc/soc-dapm.c | 100 -------------------------------------------------- 1 files changed, 0 insertions(+), 100 deletions(-)

diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c index b11d011..c9196d6 100644 --- a/sound/soc/soc-dapm.c +++ b/sound/soc/soc-dapm.c @@ -322,45 +322,6 @@ static int dapm_connect_mixer(struct snd_soc_dapm_context *dapm, return -ENODEV; }

-/* update dapm codec register bits */ -static int dapm_update_bits(struct snd_soc_dapm_widget *widget) -{

• int change, power;
• unsigned int old, new;
• struct snd_soc_codec *codec = widget->codec;
• struct snd_soc_dapm_context *dapm = widget->dapm;
• struct snd_soc_card *card = dapm->card;
• /* check for valid widgets */
• if (widget->reg < 0 || widget->id == snd_soc_dapm_input ||

• widget->id == snd_soc_dapm_output ||
  

• widget->id == snd_soc_dapm_hp ||
  

• widget->id == snd_soc_dapm_mic ||
  

• widget->id == snd_soc_dapm_line ||
  

• widget->id == snd_soc_dapm_spk)
  

• return 0;
  

• power = widget->power;
• if (widget->invert)

• power = (power ? 0:1);
  

• old = snd_soc_read(codec, widget->reg);
• new = (old & ~(0x1 << widget->shift)) | (power << widget->shift);
• change = old != new;
• if (change) {

• pop_dbg(dapm->dev, card->pop_time,
  

• 	"pop test %s : %s in %d ms\n",
  

• 	widget->name, widget->power ? "on" : "off",
  

• 	card->pop_time);
  

• pop_wait(card->pop_time);
  

• snd_soc_write(codec, widget->reg, new);
  

• }
• dev_dbg(dapm->dev, "reg %x old %x new %x change %d\n", widget->reg,

• old, new, change);
  

• return change;

-}

/* create new dapm mixer control */ static int dapm_new_mixer(struct snd_soc_dapm_context *dapm, struct snd_soc_dapm_widget *w) @@ -644,57 +605,6 @@ int dapm_reg_event(struct snd_soc_dapm_widget *w, } EXPORT_SYMBOL_GPL(dapm_reg_event);

-/* Standard power change method, used to apply power changes to most

• • widgets.
• */

-static int dapm_generic_apply_power(struct snd_soc_dapm_widget *w) -{

• int ret;
• /* call any power change event handlers */
• if (w->event)

• dev_dbg(w->dapm->dev, "power %s event for %s flags %x\n",
  

• 	 w->power ? "on" : "off",
  

• 	 w->name, w->event_flags);
  

• /* power up pre event */
• if (w->power && w->event &&

•    (w->event_flags & SND_SOC_DAPM_PRE_PMU)) {
  

• ret = w->event(w, NULL, SND_SOC_DAPM_PRE_PMU);
  

• if (ret < 0)
  

• 	return ret;
  

• }
• /* power down pre event */
• if (!w->power && w->event &&

•    (w->event_flags & SND_SOC_DAPM_PRE_PMD)) {
  

• ret = w->event(w, NULL, SND_SOC_DAPM_PRE_PMD);
  

• if (ret < 0)
  

• 	return ret;
  

• }
• dapm_update_bits(w);
• /* power up post event */
• if (w->power && w->event &&

•    (w->event_flags & SND_SOC_DAPM_POST_PMU)) {
  

• ret = w->event(w,
  

• 	       NULL, SND_SOC_DAPM_POST_PMU);
  

• if (ret < 0)
  

• 	return ret;
  

• }
• /* power down post event */
• if (!w->power && w->event &&

•    (w->event_flags & SND_SOC_DAPM_POST_PMD)) {
  

• ret = w->event(w, NULL, SND_SOC_DAPM_POST_PMD);
  

• if (ret < 0)
  

• 	return ret;
  

• }
• return 0;

-}

/* Generic check to see if a widget should be powered. */ static int dapm_generic_check_power(struct snd_soc_dapm_widget *w) @@ -981,16 +891,6 @@ static void dapm_seq_run(struct snd_soc_dapm_context *dapm, NULL, SND_SOC_DAPM_POST_PMD); break;

• 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 */
  

• 	ret = dapm_generic_apply_power(w);
  

• 	break;
  

• default: /* Queue it up for application */ cur_sort = sort[w->id];

-- 1.7.4.1