linux-kernel - [PATCH AUTOSEL 4.14 05/21] ASoC: sun4i-codec: fix first delay on Speaker

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Message-Id: <20190626034506.24125-5-sashal@kernel.org>
Date:   Tue, 25 Jun 2019 23:44:50 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Georgii Staroselskii <georgii.staroselskii@...id.com>,
        Chen-Yu Tsai <wens@...e.org>, Mark Brown <broonie@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 4.14 05/21] ASoC: sun4i-codec: fix first delay on Speaker

From: Georgii Staroselskii <georgii.staroselskii@...id.com>

[ Upstream commit 1f2675f6655838aaf910f911fd0abc821e3ff3df ]

Allwinner DAC seems to have a delay in the Speaker audio routing. When
playing a sound for the first time, the sound gets chopped. On a second
play the sound is played correctly. After some time (~5s) the issue gets
back.

This commit seems to be fixing the same issue as bf14da7 but
for another codepath.

This is the DTS that was used to debug the problem.

&codec {
        allwinner,pa-gpios = <&r_pio 0 11 GPIO_ACTIVE_HIGH>; /* PL11 */
        allwinner,audio-routing =
                "Speaker", "LINEOUT";

        status = "okay";
}

Signed-off-by: Georgii Staroselskii <georgii.staroselskii@...id.com>
Reviewed-by: Chen-Yu Tsai <wens@...e.org>
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 sound/soc/sunxi/sun4i-codec.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/sound/soc/sunxi/sun4i-codec.c b/sound/soc/sunxi/sun4i-codec.c
index baa9007464ed..0391297eecd6 100644
--- a/sound/soc/sunxi/sun4i-codec.c
+++ b/sound/soc/sunxi/sun4i-codec.c
@@ -1174,6 +1174,15 @@ static int sun4i_codec_spk_event(struct snd_soc_dapm_widget *w,
 	gpiod_set_value_cansleep(scodec->gpio_pa,
 				 !!SND_SOC_DAPM_EVENT_ON(event));
 
+	if (SND_SOC_DAPM_EVENT_ON(event)) {
+		/*
+		 * Need a delay to wait for DAC to push the data. 700ms seems
+		 * to be the best compromise not to feel this delay while
+		 * playing a sound.
+		 */
+		msleep(700);
+	}
+
 	return 0;
 }
 
-- 
2.20.1