linux-kernel - [PATCH 6/8] ASoC: cirrus: i2s: Prepare clock before using it

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Date:   Mon, 26 Jul 2021 14:50:50 +0300
From:   Nikita Shubin <nikita.shubin@...uefel.me>
To:     Alexander Sverdlin <alexander.sverdlin@...il.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
        alsa-devel@...a-project.org (moderated list:SOUND - SOC LAYER / DYNAMIC
        AUDIO POWER MANAGEM...), linux-kernel@...r.kernel.org (open list)
Subject: [PATCH 6/8] ASoC: cirrus: i2s: Prepare clock before using it

From: Alexander Sverdlin <alexander.sverdlin@...il.com>

Use clk_prepare_enable()/clk_disable_unprepare() in preparation for switch
to Common Clock Framework, otherwise the following is visible:

WARNING: CPU: 0 PID: 97 at drivers/clk/clk.c:1011 clk_core_enable+0x9c/0xbc
Enabling unprepared mclk
...
Hardware name: Cirrus Logic EDB9302 Evaluation Board
...
clk_core_enable
clk_core_enable_lock
ep93xx_i2s_hw_params
snd_soc_dai_hw_params
soc_pcm_hw_params
snd_pcm_hw_params
snd_pcm_ioctl
...

Signed-off-by: Alexander Sverdlin <alexander.sverdlin@...il.com>
---
 sound/soc/cirrus/ep93xx-i2s.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/sound/soc/cirrus/ep93xx-i2s.c b/sound/soc/cirrus/ep93xx-i2s.c
index 0d26550d0df8..4d3179f03202 100644
--- a/sound/soc/cirrus/ep93xx-i2s.c
+++ b/sound/soc/cirrus/ep93xx-i2s.c
@@ -111,9 +111,9 @@ static void ep93xx_i2s_enable(struct ep93xx_i2s_info *info, int stream)
 	if ((ep93xx_i2s_read_reg(info, EP93XX_I2S_TX0EN) & 0x1) == 0 &&
 	    (ep93xx_i2s_read_reg(info, EP93XX_I2S_RX0EN) & 0x1) == 0) {
 		/* Enable clocks */
-		clk_enable(info->mclk);
-		clk_enable(info->sclk);
-		clk_enable(info->lrclk);
+		clk_prepare_enable(info->mclk);
+		clk_prepare_enable(info->sclk);
+		clk_prepare_enable(info->lrclk);
 
 		/* Enable i2s */
 		ep93xx_i2s_write_reg(info, EP93XX_I2S_GLCTRL, 1);
@@ -156,9 +156,9 @@ static void ep93xx_i2s_disable(struct ep93xx_i2s_info *info, int stream)
 		ep93xx_i2s_write_reg(info, EP93XX_I2S_GLCTRL, 0);
 
 		/* Disable clocks */
-		clk_disable(info->lrclk);
-		clk_disable(info->sclk);
-		clk_disable(info->mclk);
+		clk_disable_unprepare(info->lrclk);
+		clk_disable_unprepare(info->sclk);
+		clk_disable_unprepare(info->mclk);
 	}
 }
 
-- 
2.26.2