linux-kernel - [PATCH] ASoC: da7218: Set DAI output pin high impedance when not in use

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <20161216110502.849053FA9F@swsrvapps-01.diasemi.com>
Date:   Fri, 16 Dec 2016 11:05:02 +0000
From:   Adam Thomson <Adam.Thomson.Opensource@...semi.com>
To:     Mark Brown <broonie@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>
CC:     Support Opensource <support.opensource@...semi.com>,
        <alsa-devel@...a-project.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH] ASoC: da7218: Set DAI output pin high impedance when not in
 use

For TDM mode, the I2S data out line can be shared between mutliple
codecs. In this scenario, only the active codec should be using
the line, and all others should be high impedance. However,
currently in the driver this configuration isn't set when capture
is inactive, and the line remains driven.

This patch updates the AIF_OUT widget to set the DAI output pin of
the device as high impedance when not in use.

Signed-off-by: Adam Thomson <Adam.Thomson.Opensource@...semi.com>
---
 sound/soc/codecs/da7218.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/sound/soc/codecs/da7218.c b/sound/soc/codecs/da7218.c
index c69e976..d256ebf 100644
--- a/sound/soc/codecs/da7218.c
+++ b/sound/soc/codecs/da7218.c
@@ -1634,7 +1634,8 @@ static int da7218_hp_pga_event(struct snd_soc_dapm_widget *w,
 			    SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_POST_PMD),
 
 	/* DAI */
-	SND_SOC_DAPM_AIF_OUT("DAIOUT", "Capture", 0, SND_SOC_NOPM, 0, 0),
+	SND_SOC_DAPM_AIF_OUT("DAIOUT", "Capture", 0, DA7218_DAI_TDM_CTRL,
+			     DA7218_DAI_OE_SHIFT, DA7218_NO_INVERT),
 	SND_SOC_DAPM_AIF_IN("DAIIN", "Playback", 0, SND_SOC_NOPM, 0, 0),
 
 	/* Output Mixers */
-- 
1.9.3