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);