linux-kernel - [PATCH] ASoC: amd: Allow I2S wake event after ACP is powerd On

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Date:   Wed, 26 Feb 2020 16:17:44 +0530
From:   Akshu Agrawal <akshu.agrawal@....com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     akshu.agrawal@....com, Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Ravulapati Vishnu vardhan rao 
        <Vishnuvardhanrao.Ravulapati@....com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        alsa-devel@...a-project.org (moderated list:SOUND - SOC LAYER / DYNAMIC
        AUDIO POWER MANAGEM...), linux-kernel@...r.kernel.org (open list)
Subject: [PATCH] ASoC: amd: Allow I2S wake event after ACP is powerd On

ACP_PME_EN allows wake interrupt to be generated when I2S wake
feature is enabled. On turning ACP On, ACP_PME_EN gets cleared.
Setting the bit back ensures that wake event can be received
when ACP is On.

Signed-off-by: Akshu Agrawal <akshu.agrawal@....com>
---
 sound/soc/amd/raven/pci-acp3x.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/sound/soc/amd/raven/pci-acp3x.c b/sound/soc/amd/raven/pci-acp3x.c
index da60e2ec5535..f25ce50f1a90 100644
--- a/sound/soc/amd/raven/pci-acp3x.c
+++ b/sound/soc/amd/raven/pci-acp3x.c
@@ -38,8 +38,13 @@ static int acp3x_power_on(void __iomem *acp3x_base)
 	timeout = 0;
 	while (++timeout < 500) {
 		val = rv_readl(acp3x_base + mmACP_PGFSM_STATUS);
-		if (!val)
+		if (!val) {
+			/* Set PME_EN as after ACP power On,
+			 * PME_EN gets cleared
+			 */
+			rv_writel(0x1, acp3x_base + mmACP_PME_EN);
 			return 0;
+		}
 		udelay(1);
 	}
 	return -ETIMEDOUT;
-- 
2.17.1