[PATCH AUTOSEL 4.18 28/48] sound: don't call skl_init_chip() to reset intel skl soc

[Sasha Levin]

From: Yu Zhao <yuz...@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 <ti...@suse.de>
Signed-off-by: Yu Zhao <yuz...@google.com>
Signed-off-by: Mark Brown <broo...@kernel.org>
Signed-off-by: Sasha Levin <alexander.le...@microsoft.com>
---
 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(-)

diff --git a/include/sound/hdaudio.h b/include/sound/hdaudio.h
index c052afc27547..138e976a2ba2 100644
--- a/include/sound/hdaudio.h
+++ b/include/sound/hdaudio.h
@@ -355,6 +355,7 @@ void snd_hdac_bus_init_cmd_io(struct hdac_bus *bus);
 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,
diff --git a/sound/hda/hdac_controller.c b/sound/hda/hdac_controller.c
index 11057d9f84ec..74244d8e2909 100644
--- a/sound/hda/hdac_controller.c
+++ b/sound/hda/hdac_controller.c
@@ -385,7 +385,7 @@ void snd_hdac_bus_exit_link_reset(struct hdac_bus *bus)
 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 *bus, bool full_reset)
  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 *bus, bool full_reset)
 
        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_bus *bus, bool 
full_reset)
                return false;
 
        /* reset controller */
-       azx_reset(bus, full_reset);
+       snd_hdac_bus_reset_link(bus, full_reset);
 
        /* clear interrupts */
        azx_int_clear(bus);
diff --git a/sound/soc/intel/skylake/skl.c b/sound/soc/intel/skylake/skl.c
index f0d9793f872a..c7cdfa4a7076 100644
--- 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_ext_bus *ebus)
                return -ENXIO;
        }
 
-       skl_init_chip(bus, true);
+       snd_hdac_bus_reset_link(bus, true);
 
        snd_hdac_bus_parse_capabilities(bus);
 
-- 
2.17.1