From: Hui Wang <hui.wang@canonical.com>
To: tiwai@suse.de, alsa-devel@alsa-project.org
Cc: stable@vger.kernel.org, hui.wang@canonical.com,
franz.hsieh@canonical.com
Subject: [PATCH v2] ALSA: hda - restore the gpio led after resume
Date: Tue, 19 Aug 2014 12:07:03 +0800 [thread overview]
Message-ID: <1408421223-10913-1-git-send-email-hui.wang@canonical.com> (raw)
On some HP laptops, the mute led is controlled by codec gpio.
When some machine resume from s3/s4, the codec gpio data will be
cleared to 0 by BIOS:
Before suspend:
IO[3]: enable=1, dir=1, wake=0, sticky=0, data=1, unsol=0
After resume:
IO[3]: enable=1, dir=1, wake=0, sticky=0, data=0, unsol=0
To skip the AFG node to enter D3 can't fix this problem.
A workaround is to restore the gpio data when the system resume
back from s3/s4. It is safe even on the machines without this
problem.
BugLink: https://bugs.launchpad.net/bugs/1358116
Tested-by: Franz Hsieh <franz.hsieh@canonical.com>
Cc: stable@vger.kernel.org
Signed-off-by: Hui Wang <hui.wang@canonical.com>
---
V2: move the verb write from led_power_filter to alc269_resume
sound/pci/hda/patch_realtek.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/sound/pci/hda/patch_realtek.c b/sound/pci/hda/patch_realtek.c
index b32ce08..d71270a 100644
--- a/sound/pci/hda/patch_realtek.c
+++ b/sound/pci/hda/patch_realtek.c
@@ -3268,6 +3268,15 @@ static int alc269_resume(struct hda_codec *codec)
snd_hda_codec_resume_cache(codec);
alc_inv_dmic_sync(codec, true);
hda_call_check_power_status(codec, 0x01);
+
+ /* on some machine, the BIOS will clear the codec gpio data when enter
+ * suspend, and won't restore the data after resume, so we restore it
+ * in the driver.
+ */
+ if (spec->gpio_led)
+ snd_hda_codec_write(codec, codec->afg, 0, AC_VERB_SET_GPIO_DATA,
+ spec->gpio_led);
+
if (spec->has_alc5505_dsp)
alc5505_dsp_resume(codec);
--
1.9.1
next reply other threads:[~2014-08-19 4:07 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-19 4:07 Hui Wang [this message]
2014-08-19 6:07 ` [PATCH v2] ALSA: hda - restore the gpio led after resume Takashi Iwai
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