linux-kernel - [PATCH v2] ALSA: hda: avoid reset of sdo

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Message-ID: <1597851130-6765-1-git-send-email-spujar@nvidia.com>
Date:   Wed, 19 Aug 2020 21:02:10 +0530
From:   Sameer Pujar <spujar@...dia.com>
To:     <tiwai@...e.com>, <perex@...ex.cz>
CC:     <kai.vehmanen@...ux.intel.com>, <yang.jie@...ux.intel.com>,
        <pierre-louis.bossart@...ux.intel.com>,
        <alsa-devel@...a-project.org>, <linux-kernel@...r.kernel.org>,
        Sameer Pujar <spujar@...dia.com>, <stable@...r.kernel.org>
Subject: [PATCH v2] ALSA: hda: avoid reset of sdo_limit

By default 'sdo_limit' is initialized with a default value of '8'
as per spec. This is overridden in cases where a different value is
required. However this is getting reset when snd_hdac_bus_init_chip()
is called again, which happens during runtime PM cycle.

Avoid this reset by moving 'sdo_limit' setup to 'snd_hdac_bus_init()'
function which would be called only once.

Fixes: 67ae482a59e9 ("ALSA: hda: add member to store ratio for stripe control")
Cc: <stable@...r.kernel.org>
Signed-off-by: Sameer Pujar <spujar@...dia.com>
---
 sound/hda/hdac_bus.c        | 12 ++++++++++++
 sound/hda/hdac_controller.c | 11 -----------
 2 files changed, 12 insertions(+), 11 deletions(-)

diff --git a/sound/hda/hdac_bus.c b/sound/hda/hdac_bus.c
index 09ddab5..9766f6a 100644
--- a/sound/hda/hdac_bus.c
+++ b/sound/hda/hdac_bus.c
@@ -46,6 +46,18 @@ int snd_hdac_bus_init(struct hdac_bus *bus, struct device *dev,
 	INIT_LIST_HEAD(&bus->hlink_list);
 	init_waitqueue_head(&bus->rirb_wq);
 	bus->irq = -1;
+
+	/*
+	 * Default value of '8' is as per the HD audio specification (Rev 1.0a).
+	 * Following relation is used to derive STRIPE control value.
+	 *  For sample rate <= 48K:
+	 *   { ((num_channels * bits_per_sample) / number of SDOs) >= 8 }
+	 *  For sample rate > 48K:
+	 *   { ((num_channels * bits_per_sample * rate/48000) /
+	 *	number of SDOs) >= 8 }
+	 */
+	bus->sdo_limit = 8;
+
 	return 0;
 }
 EXPORT_SYMBOL_GPL(snd_hdac_bus_init);
diff --git a/sound/hda/hdac_controller.c b/sound/hda/hdac_controller.c
index 011b17c..b98449f 100644
--- a/sound/hda/hdac_controller.c
+++ b/sound/hda/hdac_controller.c
@@ -529,17 +529,6 @@ bool snd_hdac_bus_init_chip(struct hdac_bus *bus, bool full_reset)
 
 	bus->chip_init = true;
 
-	/*
-	 * Default value of '8' is as per the HD audio specification (Rev 1.0a).
-	 * Following relation is used to derive STRIPE control value.
-	 *  For sample rate <= 48K:
-	 *   { ((num_channels * bits_per_sample) / number of SDOs) >= 8 }
-	 *  For sample rate > 48K:
-	 *   { ((num_channels * bits_per_sample * rate/48000) /
-	 *	number of SDOs) >= 8 }
-	 */
-	bus->sdo_limit = 8;
-
 	return true;
 }
 EXPORT_SYMBOL_GPL(snd_hdac_bus_init_chip);
-- 
2.7.4