linux-kernel - Re: [PATCH AUTOSEL 4.18 28/48] sound: don't call skl_init

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Date:   Mon, 8 Oct 2018 10:34:25 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Sasha Levin <sashal@...nel.org>
Cc:     stable@...r.kernel.org, linux-kernel@...r.kernel.org,
        Yu Zhao <yuzhao@...gle.com>,
        Sasha Levin <alexander.levin@...rosoft.com>, tiwai@...e.de
Subject: Re: [PATCH AUTOSEL 4.18 28/48] sound: don't call skl_init_chip() to
 reset intel skl soc

On Fri, Oct 05, 2018 at 12:14:04PM -0400, Sasha Levin wrote:
> From: Yu Zhao <yuzhao@...gle.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.

And here.

> 
> 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@...e.de>
> Signed-off-by: Yu Zhao <yuzhao@...gle.com>
> Signed-off-by: Mark Brown <broonie@...nel.org>
> Signed-off-by: Sasha Levin <alexander.levin@...rosoft.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
> 

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