linux-kernel - Re: [RFC PATCH 3/5] ASoC: SOF: Intel: hda: add SoundWire IP support

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Date:   Wed, 4 Sep 2019 12:51:31 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
Cc:     alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        tiwai@...e.de, broonie@...nel.org, gregkh@...uxfoundation.org,
        jank@...ence.com, srinivas.kandagatla@...aro.org,
        slawomir.blauciak@...el.com,
        Bard liao <yung-chuan.liao@...ux.intel.com>,
        Rander Wang <rander.wang@...ux.intel.com>,
        Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        YueHaibing <yuehaibing@...wei.com>,
        Zhu Yingjiang <yingjiang.zhu@...ux.intel.com>,
        Kai Vehmanen <kai.vehmanen@...ux.intel.com>,
        Arnd Bergmann <arnd@...db.de>,
        Guennadi Liakhovetski <guennadi.liakhovetski@...ux.intel.com>,
        Keyon Jie <yang.jie@...ux.intel.com>,
        Pan Xiuli <xiuli.pan@...ux.intel.com>,
        Fred Oh <fred.oh@...ux.intel.com>,
        Daniel Baluta <daniel.baluta@....com>
Subject: Re: [RFC PATCH 3/5] ASoC: SOF: Intel: hda: add SoundWire IP support

On 21-08-19, 15:17, Pierre-Louis Bossart wrote:
> The Core0 needs to be powered before the SoundWire IP is initialized.
> 
> Call sdw_intel_init/exit and store the context. We only have one
> context, but depending on the hardware capabilities and BIOS settings
> may enable multiple SoundWire links.
> 
> Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
> ---
>  sound/soc/sof/intel/hda.c | 40 +++++++++++++++++++++++++++++++++------
>  sound/soc/sof/intel/hda.h |  5 +++++
>  2 files changed, 39 insertions(+), 6 deletions(-)
> 
> diff --git a/sound/soc/sof/intel/hda.c b/sound/soc/sof/intel/hda.c
> index a968890d0754..e754058e3679 100644
> --- a/sound/soc/sof/intel/hda.c
> +++ b/sound/soc/sof/intel/hda.c
> @@ -57,6 +57,8 @@ static int hda_sdw_init(struct snd_sof_dev *sdev)
>  {
>  	acpi_handle handle;
>  	struct sdw_intel_res res;
> +	struct sof_intel_hda_dev *hdev;
> +	void *sdw;
>  
>  	handle = ACPI_HANDLE(sdev->dev);
>  
> @@ -66,23 +68,32 @@ static int hda_sdw_init(struct snd_sof_dev *sdev)
>  	res.irq = sdev->ipc_irq;
>  	res.parent = sdev->dev;
>  
> -	hda_sdw_int_enable(sdev, true);
> -
> -	sdev->sdw = sdw_intel_init(handle, &res);
> -	if (!sdev->sdw) {
> +	sdw = sdw_intel_init(handle, &res);

should this be called for platforms without sdw, I was hoping that some
checks would be performed.. For example how would skl deal with this?

> +	if (!sdw) {
>  		dev_err(sdev->dev, "SDW Init failed\n");
>  		return -EIO;
>  	}
>  
> +	hda_sdw_int_enable(sdev, true);
> +
> +	/* save context */
> +	hdev = sdev->pdata->hw_pdata;
> +	hdev->sdw = sdw;
> +
>  	return 0;
>  }
>  
>  static int hda_sdw_exit(struct snd_sof_dev *sdev)
>  {
> +	struct sof_intel_hda_dev *hdev;
> +
> +	hdev = sdev->pdata->hw_pdata;
> +
>  	hda_sdw_int_enable(sdev, false);
>  
> -	if (sdev->sdw)
> -		sdw_intel_exit(sdev->sdw);

this looks suspect, you are adding sdw calls here so how is this getting
removed? Did I miss something...

> +	if (hdev->sdw)
> +		sdw_intel_exit(hdev->sdw);
> +	hdev->sdw = NULL;
>  
>  	return 0;
>  }
> @@ -713,6 +724,21 @@ int hda_dsp_probe(struct snd_sof_dev *sdev)
>  	/* set default mailbox offset for FW ready message */
>  	sdev->dsp_box.offset = HDA_DSP_MBOX_UPLINK_OFFSET;
>  
> +	/* need to power-up core before setting-up capabilities */
> +	ret = hda_dsp_core_power_up(sdev, HDA_DSP_CORE_MASK(0));
> +	if (ret < 0) {
> +		dev_err(sdev->dev, "error: could not power-up DSP subsystem\n");
> +		goto free_ipc_irq;
> +	}
> +
> +	/* initialize SoundWire capabilities */
> +	ret = hda_sdw_init(sdev);
> +	if (ret < 0) {
> +		dev_err(sdev->dev, "error: SoundWire get caps error\n");
> +		hda_dsp_core_power_down(sdev, HDA_DSP_CORE_MASK(0));
> +		goto free_ipc_irq;
> +	}
> +
>  	return 0;
>  
>  free_ipc_irq:
> @@ -744,6 +770,8 @@ int hda_dsp_remove(struct snd_sof_dev *sdev)
>  	snd_hdac_ext_bus_device_remove(bus);
>  #endif
>  
> +	hda_sdw_exit(sdev);
> +
>  	if (!IS_ERR_OR_NULL(hda->dmic_dev))
>  		platform_device_unregister(hda->dmic_dev);
>  
> diff --git a/sound/soc/sof/intel/hda.h b/sound/soc/sof/intel/hda.h
> index c8f93317aeb4..48e09b7daf0a 100644
> --- a/sound/soc/sof/intel/hda.h
> +++ b/sound/soc/sof/intel/hda.h
> @@ -399,6 +399,11 @@ struct sof_intel_hda_dev {
>  
>  	/* DMIC device */
>  	struct platform_device *dmic_dev;
> +
> +#if IS_ENABLED(CONFIG_SOUNDWIRE_INTEL)

is this really required, context is a void pointer

> +	/* sdw context */
> +	void *sdw;

> +#endif
>  };
>  
>  static inline struct hdac_bus *sof_to_bus(struct snd_sof_dev *s)
> -- 
> 2.20.1

-- 
~Vinod