linux-kernel - Re: [PATCH 3/9] ASoC: amd: ps: add soundwire dma driver

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Date:   Tue, 16 May 2023 11:50:22 -0500
From:   "Limonciello, Mario" <mlimonci@....com>
To:     Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Vijendar Mukunda <Vijendar.Mukunda@....com>,
        --to=broonie@...nel.org
Cc:     alsa-devel@...a-project.org, Basavaraj.Hiregoudar@....com,
        Sunil-kumar.Dommati@....com, Mastan.Katragadda@....com,
        Arungopal.kondaveeti@....com, Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Syed Saba Kareem <Syed.SabaKareem@....com>,
        Mario Limonciello <mario.limonciello@....com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/9] ASoC: amd: ps: add soundwire dma driver


On 5/16/2023 9:40 AM, Pierre-Louis Bossart wrote:
>
> On 5/16/23 05:35, Vijendar Mukunda wrote:
>> Soundwire DMA platform driver binds to the platform device created by
>> ACP PCI device. Soundwire DMA driver registers ALSA DMA component
>> with ASoC framework.
>>
>> Signed-off-by: Vijendar Mukunda <Vijendar.Mukunda@....com>
>> ---
>>   sound/soc/amd/ps/acp63.h      |  5 +++
>>   sound/soc/amd/ps/ps-sdw-dma.c | 71 +++++++++++++++++++++++++++++++++++
>>   2 files changed, 76 insertions(+)
>>   create mode 100644 sound/soc/amd/ps/ps-sdw-dma.c
>>
>> diff --git a/sound/soc/amd/ps/acp63.h b/sound/soc/amd/ps/acp63.h
>> index faf7be4d77c2..f86c60cd1565 100644
>> --- a/sound/soc/amd/ps/acp63.h
>> +++ b/sound/soc/amd/ps/acp63.h
>> @@ -111,6 +111,11 @@ struct pdm_dev_data {
>>   	struct snd_pcm_substream *capture_stream;
>>   };
>>   
>> +struct sdw_dma_dev_data {
>> +	void __iomem *acp_base;
>> +	struct mutex *acp_lock; /* used to protect acp common register access */
>> +};
>> +
>>   /**
>>    * struct acp63_dev_data - acp pci driver context
>>    * @acp63_base: acp mmio base
>> diff --git a/sound/soc/amd/ps/ps-sdw-dma.c b/sound/soc/amd/ps/ps-sdw-dma.c
>> new file mode 100644
>> index 000000000000..0d0889842413
>> --- /dev/null
>> +++ b/sound/soc/amd/ps/ps-sdw-dma.c
>> @@ -0,0 +1,71 @@
>> +// SPDX-License-Identifier: GPL-2.0+
>> +/*
>> + * AMD ALSA SoC Pink Sardine Soundwire DMA Driver
>> + *
>> + * Copyright 2023 Advanced Micro Devices, Inc.
>> + */
>> +
>> +#include <linux/err.h>
>> +#include <linux/io.h>
>> +#include <linux/module.h>
>> +#include <linux/platform_device.h>
>> +#include <sound/pcm_params.h>
>> +#include <sound/soc.h>
>> +#include <sound/soc-dai.h>
>> +#include "acp63.h"
>> +
>> +#define DRV_NAME "amd_ps_sdw_dma"
>> +
>> +static const struct snd_soc_component_driver acp63_sdw_component = {
>> +	.name		= DRV_NAME,
>> +};
>> +
>> +static int acp63_sdw_platform_probe(struct platform_device *pdev)
>> +{
>> +	struct resource *res;
>> +	struct sdw_dma_dev_data *sdw_data;
>> +	int status;
>> +
>> +	if (!pdev->dev.platform_data) {
>> +		dev_err(&pdev->dev, "platform_data not retrieved\n");
>> +		return -ENODEV;
>> +	}
>> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> +	if (!res) {
>> +		dev_err(&pdev->dev, "IORESOURCE_MEM FAILED\n");
>> +		return -ENODEV;
>> +	}
>> +
>> +	sdw_data = devm_kzalloc(&pdev->dev, sizeof(*sdw_data), GFP_KERNEL);
>> +	if (!sdw_data)
>> +		return -ENOMEM;
>> +
>> +	sdw_data->acp_base = devm_ioremap(&pdev->dev, res->start, resource_size(res));
>> +	if (!sdw_data->acp_base)
>> +		return -ENOMEM;
>> +
>> +	sdw_data->acp_lock = pdev->dev.platform_data;
>> +	dev_set_drvdata(&pdev->dev, sdw_data);
>> +	status = devm_snd_soc_register_component(&pdev->dev,
>> +						 &acp63_sdw_component,
>> +						 NULL, 0);
>> +	if (status) {
>> +		dev_err(&pdev->dev, "Fail to register sdw dma component\n");
>> +		return -ENODEV;
> return status;

Remove the other return 0 too.

IE:

if (status)

     dev_err(...)

return status;

>
>> +	}
>> +	return 0;
>> +}
>> +
>> +static struct platform_driver acp63_sdw_dma_driver = {
>> +	.probe = acp63_sdw_platform_probe,
>> +	.driver = {
>> +		.name = "amd_ps_sdw_dma",
>> +	},
>> +};
>> +
>> +module_platform_driver(acp63_sdw_dma_driver);
>> +
>> +MODULE_AUTHOR("Vijendar.Mukunda@....com");
>> +MODULE_DESCRIPTION("AMD ACP6.3 PS SDW DMA Driver");
>> +MODULE_LICENSE("GPL");
>> +MODULE_ALIAS("platform:" DRV_NAME);