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Message-ID: <1d73963a-de26-a147-6ccb-e5c8c65f579b@linux.intel.com>
Date:   Mon, 22 May 2023 11:16:41 -0500
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Subject: Re: [PATCH V2 1/9] ASoC: amd: ps: create platform devices based on
 acp config
Content-Language: en-US
To:     Vijendar Mukunda <Vijendar.Mukunda@amd.com>, broonie@kernel.org
Cc:     alsa-devel@alsa-project.org, Basavaraj.Hiregoudar@amd.com,
        Sunil-kumar.Dommati@amd.com, Mastan.Katragadda@amd.com,
        Arungopal.kondaveeti@amd.com, mario.limonciello@amd.com,
        Liam Girdwood <lgirdwood@gmail.com>,
        Jaroslav Kysela <perex@perex.cz>,
        Takashi Iwai <tiwai@suse.com>,
        Syed Saba Kareem <Syed.SabaKareem@amd.com>,
        open list <linux-kernel@vger.kernel.org>
References: <20230522133122.166841-1-Vijendar.Mukunda@amd.com>
 <20230522133122.166841-2-Vijendar.Mukunda@amd.com>
From:   Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
In-Reply-To: <20230522133122.166841-2-Vijendar.Mukunda@amd.com>
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> +static int sdw_amd_scan_controller(struct device *dev)
> +{
> +	struct acp63_dev_data *acp_data;
> +	struct fwnode_handle *link;
> +	char name[32];
> +	u32 sdw_manager_bitmap;
> +	u8 count = 0;
> +	u32 acp_sdw_power_mode = 0;
> +	int index;
> +	int ret;
> +
> +	acp_data = dev_get_drvdata(dev);
> +	acp_data->acp_reset = true;
> +	/* Found controller, find links supported */
> +	ret = fwnode_property_read_u32_array((acp_data->sdw_fw_node), "mipi-sdw-manager-list",
> +					     &sdw_manager_bitmap, 1);
> +
> +	if (ret) {
> +		dev_err(dev, "Failed to read mipi-sdw-manager-list: %d\n", ret);
> +		return -EINVAL;
> +	}
> +	count = hweight32(sdw_manager_bitmap);
> +	/* Check count is within bounds */
> +	if (count > AMD_SDW_MAX_MANAGERS) {
> +		dev_err(dev, "Manager count %d exceeds max %d\n", count, AMD_SDW_MAX_MANAGERS);
> +		return -EINVAL;
> +	}
> +
> +	if (!count) {
> +		dev_dbg(dev, "No SoundWire Managers detected\n");
> +		return -EINVAL;
> +	}
> +	dev_dbg(dev, "ACPI reports %d SoundWire Manager devices\n", count);
> +	acp_data->sdw_manager_count = count;
> +	for (index = 0; index < count; index++) {
> +		snprintf(name, sizeof(name), "mipi-sdw-link-%d-subproperties", index);
> +		link = fwnode_get_named_child_node(acp_data->sdw_fw_node, name);
> +		if (!link) {
> +			dev_err(dev, "Manager node %s not found\n", name);
> +			return -EIO;
> +		}
> +
> +		fwnode_property_read_u32(link, "amd-sdw-power-mode",
> +					 &acp_sdw_power_mode);

What happens if this property is not found or doesn't exist?

acp_sdw_power_mode is zero, so....


> +		/*
> +		 * when SoundWire configuration is selected from acp pin config,
> +		 * based on manager instances count, acp init/de-init sequence should be
> +		 * executed as part of PM ops only when Bus reset is applied for the active
> +		 * SoundWire manager instances.
> +		 */
> +		if (acp_sdw_power_mode != AMD_SDW_POWER_OFF_MODE)
> +			acp_data->acp_reset = false;

... here this branch is taken.

Is this intentional?

> +	}
> +	return 0;
> +}
> +
> +static int get_acp63_device_config(u32 config, struct pci_dev *pci, struct acp63_dev_data *acp_data)
>  {
>  	struct acpi_device *dmic_dev;
> +	struct acpi_device *sdw_dev;
>  	const union acpi_object *obj;
>  	bool is_dmic_dev = false;

useless init

> +	bool is_sdw_dev = false;

and useless init as well...

> +	int ret;
>  
>  	dmic_dev = acpi_find_child_device(ACPI_COMPANION(&pci->dev), ACP63_DMIC_ADDR, 0);
>  	if (dmic_dev) {
> +		/* is_dmic_dev flag will be set when ACP PDM controller device exists */
>  		if (!acpi_dev_get_property(dmic_dev, "acp-audio-device-type",
>  					   ACPI_TYPE_INTEGER, &obj) &&
>  					   obj->integer.value == ACP_DMIC_DEV)
>  			is_dmic_dev = true;
>  	}
>  
> +	sdw_dev = acpi_find_child_device(ACPI_COMPANION(&pci->dev), ACP63_SDW_ADDR, 0);
> +	if (sdw_dev) {
> +		acp_data->sdw_fw_node = acpi_fwnode_handle(sdw_dev);
> +		ret = sdw_amd_scan_controller(&pci->dev);
> +		/* is_sdw_dev flag will be set when SoundWire Manager device exists */
> +		if (!ret)
> +			is_sdw_dev = true;

sdw_amd_scan_controller() can return -EINVAL, how is this handled?
Shouldn't you stop execution and return here in the < 0 case?

> +	}
> +
> +	dev_dbg(&pci->dev, "Audio Mode %d\n", config);
>  	switch (config) {
> -	case ACP_CONFIG_0:
> -	case ACP_CONFIG_1:
> +	case ACP_CONFIG_4:
> +	case ACP_CONFIG_5:
> +	case ACP_CONFIG_10:
> +	case ACP_CONFIG_11:
> +		if (is_dmic_dev) {
> +			acp_data->pdev_mask = ACP63_PDM_DEV_MASK;
> +			acp_data->pdev_count = ACP63_PDM_MODE_DEVS;
> +		}
> +		break;
>  	case ACP_CONFIG_2:
>  	case ACP_CONFIG_3:
> -	case ACP_CONFIG_9:
> -	case ACP_CONFIG_15:
> -		dev_dbg(&pci->dev, "Audio Mode %d\n", config);
> +		if (is_sdw_dev) {
> +			switch (acp_data->sdw_manager_count) {
> +			case 1:
> +				acp_data->pdev_mask = ACP63_SDW_DEV_MASK;
> +				acp_data->pdev_count = ACP63_SDW0_MODE_DEVS;
> +				break;
> +			case 2:
> +				acp_data->pdev_mask = ACP63_SDW_DEV_MASK;
> +				acp_data->pdev_count = ACP63_SDW0_SDW1_MODE_DEVS;
> +				break;
> +			default:
> +				return -EINVAL;
> +			}
> +		}
>  		break;
> -	default:
> -		if (is_dmic_dev) {
> +	case ACP_CONFIG_6:
> +	case ACP_CONFIG_7:
> +	case ACP_CONFIG_12:
> +	case ACP_CONFIG_8:
> +	case ACP_CONFIG_13:
> +	case ACP_CONFIG_14:
> +		if (is_dmic_dev && is_sdw_dev) {
> +			switch (acp_data->sdw_manager_count) {
> +			case 1:
> +				acp_data->pdev_mask = ACP63_SDW_PDM_DEV_MASK;
> +				acp_data->pdev_count = ACP63_SDW0_PDM_MODE_DEVS;
> +				break;
> +			case 2:
> +				acp_data->pdev_mask = ACP63_SDW_PDM_DEV_MASK;
> +				acp_data->pdev_count = ACP63_SDW0_SDW1_PDM_MODE_DEVS;
> +				break;
> +			default:
> +				return -EINVAL;
> +			}
> +		} else if (is_dmic_dev) {
>  			acp_data->pdev_mask = ACP63_PDM_DEV_MASK;
>  			acp_data->pdev_count = ACP63_PDM_MODE_DEVS;
> +		} else if (is_sdw_dev) {
> +			switch (acp_data->sdw_manager_count) {
> +			case 1:
> +				acp_data->pdev_mask = ACP63_SDW_DEV_MASK;
> +				acp_data->pdev_count = ACP63_SDW0_MODE_DEVS;
> +				break;
> +			case 2:
> +				acp_data->pdev_mask = ACP63_SDW_DEV_MASK;
> +				acp_data->pdev_count = ACP63_SDW0_SDW1_MODE_DEVS;
> +				break;
> +			default:
> +				return -EINVAL;
> +			}
>  		}
>  		break;
> +	default:
> +		break;
>  	}
> +	return 0;
>  }

>  		dev_err(&pci->dev, "ACP platform devices creation failed\n");