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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Takashi Iwai <tiwai@suse.de>,
        Yu Zhao <yuzhao@google.com>, Mark Brown <broonie@kernel.org>,
        Sasha Levin <alexander.levin@microsoft.com>
Subject: [PATCH 4.18 090/135] sound: dont call skl_init_chip() to reset intel skl soc
Date:   Tue, 16 Oct 2018 19:05:20 +0200
Message-Id: <20181016170521.573171786@linuxfoundation.org>
In-Reply-To: <20181016170515.447235311@linuxfoundation.org>
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4.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Yu Zhao <yuzhao@google.com>

[ Upstream commit 75383f8d39d4c0fb96083dd460b7b139fbdac492 ]

Internally, skl_init_chip() calls snd_hdac_bus_init_chip() which
1) sets bus->chip_init to prevent multiple entrances before device
is stopped; 2) enables interrupt.

We shouldn't use it for the purpose of resetting device only because
1) when we really want to initialize device, we won't be able to do
so; 2) we are ready to handle interrupt yet, and kernel crashes when
interrupt comes in.

Rename azx_reset() to snd_hdac_bus_reset_link(), and use it to reset
device properly.

Fixes: 60767abcea3d ("ASoC: Intel: Skylake: Reset the controller in probe")
Reviewed-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Yu Zhao <yuzhao@google.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 include/sound/hdaudio.h       |    1 +
 sound/hda/hdac_controller.c   |    7 ++++---
 sound/soc/intel/skylake/skl.c |    2 +-
 3 files changed, 6 insertions(+), 4 deletions(-)

--- a/include/sound/hdaudio.h
+++ b/include/sound/hdaudio.h
@@ -355,6 +355,7 @@ void snd_hdac_bus_init_cmd_io(struct hda
 void snd_hdac_bus_stop_cmd_io(struct hdac_bus *bus);
 void snd_hdac_bus_enter_link_reset(struct hdac_bus *bus);
 void snd_hdac_bus_exit_link_reset(struct hdac_bus *bus);
+int snd_hdac_bus_reset_link(struct hdac_bus *bus, bool full_reset);
 
 void snd_hdac_bus_update_rirb(struct hdac_bus *bus);
 int snd_hdac_bus_handle_stream_irq(struct hdac_bus *bus, unsigned int status,
--- a/sound/hda/hdac_controller.c
+++ b/sound/hda/hdac_controller.c
@@ -385,7 +385,7 @@ void snd_hdac_bus_exit_link_reset(struct
 EXPORT_SYMBOL_GPL(snd_hdac_bus_exit_link_reset);
 
 /* reset codec link */
-static int azx_reset(struct hdac_bus *bus, bool full_reset)
+int snd_hdac_bus_reset_link(struct hdac_bus *bus, bool full_reset)
 {
 	if (!full_reset)
 		goto skip_reset;
@@ -410,7 +410,7 @@ static int azx_reset(struct hdac_bus *bu
  skip_reset:
 	/* check to see if controller is ready */
 	if (!snd_hdac_chip_readb(bus, GCTL)) {
-		dev_dbg(bus->dev, "azx_reset: controller not ready!\n");
+		dev_dbg(bus->dev, "controller not ready!\n");
 		return -EBUSY;
 	}
 
@@ -425,6 +425,7 @@ static int azx_reset(struct hdac_bus *bu
 
 	return 0;
 }
+EXPORT_SYMBOL_GPL(snd_hdac_bus_reset_link);
 
 /* enable interrupts */
 static void azx_int_enable(struct hdac_bus *bus)
@@ -479,7 +480,7 @@ bool snd_hdac_bus_init_chip(struct hdac_
 		return false;
 
 	/* reset controller */
-	azx_reset(bus, full_reset);
+	snd_hdac_bus_reset_link(bus, full_reset);
 
 	/* clear interrupts */
 	azx_int_clear(bus);
--- a/sound/soc/intel/skylake/skl.c
+++ b/sound/soc/intel/skylake/skl.c
@@ -844,7 +844,7 @@ static int skl_first_init(struct hdac_ex
 		return -ENXIO;
 	}
 
-	skl_init_chip(bus, true);
+	snd_hdac_bus_reset_link(bus, true);
 
 	snd_hdac_bus_parse_capabilities(bus);