From mboxrd@z Thu Jan 1 00:00:00 1970 From: Wang Xingchao Subject: [PATCH 3/3 V3] ALSA: hda - WAKEEN feature enabling for runtime pm Date: Tue, 30 Jul 2013 03:06:09 -0400 Message-ID: <1375167969-14128-3-git-send-email-xingchao.wang@linux.intel.com> References: <1375167969-14128-1-git-send-email-xingchao.wang@linux.intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from mga03.intel.com (mga03.intel.com [143.182.124.21]) by alsa0.perex.cz (Postfix) with ESMTP id 32F44265130 for ; Tue, 30 Jul 2013 08:30:40 +0200 (CEST) In-Reply-To: <1375167969-14128-1-git-send-email-xingchao.wang@linux.intel.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: alsa-devel-bounces@alsa-project.org Sender: alsa-devel-bounces@alsa-project.org To: tiwai@suse.de Cc: alsa-devel@alsa-project.org, Wang Xingchao List-Id: alsa-devel@alsa-project.org With runtime power save feature enabled, Headphone hotplug event will not be detected while controller/codec in D3. HDA has feature WAKEEN to let codec wake up system if controller is in D3 or system in S3.(HDA Spec 4.5.9.2/3). Codec can send out INT or wake up controller depending on whether CIE or GIE enabled.(Figure 4, Interupt structure). The controller must be in RESET mode after enter runtime-suspend, otherwise it will not be waken up even if codec send out wake-up event. And STATESTS will be cleared after controller brought out of RESET mode. This patch only enable WAKEEN for runtime-suspend(Controller D3) mode, not for system S3 mode. with tool "evtest", Headphone hotplug events could be cought and reported successfully. Signed-off-by: Wang Xingchao --- sound/pci/hda/hda_intel.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c index 8860dd5..c848cf1 100644 --- a/sound/pci/hda/hda_intel.c +++ b/sound/pci/hda/hda_intel.c @@ -2971,6 +2971,10 @@ static int azx_runtime_suspend(struct device *dev) struct snd_card *card = dev_get_drvdata(dev); struct azx *chip = card->private_data; + /* enable controller wake up event */ + azx_writew(chip, WAKEEN, azx_readw(chip, WAKEEN) | + STATESTS_INT_MASK); + azx_stop_chip(chip); azx_enter_link_reset(chip); azx_clear_irq_pending(chip); @@ -2983,11 +2987,31 @@ static int azx_runtime_resume(struct device *dev) { struct snd_card *card = dev_get_drvdata(dev); struct azx *chip = card->private_data; + struct hda_bus *bus; + struct hda_codec *codec; + int status; if (chip->driver_caps & AZX_DCAPS_I915_POWERWELL) hda_display_power(true); + + /* Read STATESTS before controller reset */ + status = azx_readw(chip, STATESTS); + azx_init_pci(chip); azx_init_chip(chip, 1); + + bus = chip->bus; + if (status && bus) { + list_for_each_entry(codec, &bus->codec_list, list) + if (status & (1 << codec->addr)) + queue_delayed_work(codec->bus->workq, + &codec->jackpoll_work, codec->jackpoll_interval); + } + + /* disable controller Wake Up event*/ + azx_writew(chip, WAKEEN, azx_readw(chip, WAKEEN) & + ~STATESTS_INT_MASK); + return 0; } -- 1.8.3.2