linux-kernel - Re: [PATCH v1 3/3] ASoC: amd: acp: Add legacy audio driver support for Rembrandt platform

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Date:   Sun, 31 Jul 2022 17:41:25 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     V sujith kumar Reddy <Vsujithkumar.Reddy@....com>,
        broonie@...nel.org, alsa-devel@...a-project.org
Cc:     Sunil-kumar.Dommati@....com,
        Charles Keepax <ckeepax@...nsource.cirrus.com>,
        ssabakar@....com, Ajit Kumar Pandey <AjitKumar.Pandey@....com>,
        venkataprasad.potturu@....com, Meng Tang <tangmeng@...ontech.com>,
        Basavaraj.Hiregoudar@....com, Takashi Iwai <tiwai@...e.com>,
        open list <linux-kernel@...r.kernel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Yang Yingliang <yangyingliang@...wei.com>,
        Jia-Ju Bai <baijiaju1990@...il.com>,
        Arnd Bergmann <arnd@...db.de>,
        Akihiko Odaki <akihiko.odaki@...il.com>,
        Vijendar.Mukunda@....com,
        Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Dan Carpenter <dan.carpenter@...cle.com>
Subject: Re: [PATCH v1 3/3] ASoC: amd: acp: Add legacy audio driver support
 for Rembrandt platform

Hi,

this patch has already reached -next, but a few nit below.

Le 07/07/2022 à 18:11, V sujith kumar Reddy a écrit :
> Add i2s and dmic support for Rembrandt platform,
> Add machine support for nau8825, max98360 and rt5682s,rt1019 codec
> in legacy driver for rembrandt platform.
> Here codec is in a slave mode.
> 
> Signed-off-by: V sujith kumar Reddy <Vsujithkumar.Reddy@....com>
> ---
>   sound/soc/amd/acp/Kconfig            |  11 +
>   sound/soc/amd/acp/Makefile           |   2 +
>   sound/soc/amd/acp/acp-i2s.c          | 137 ++++++++-
>   sound/soc/amd/acp/acp-legacy-mach.c  |  32 +++
>   sound/soc/amd/acp/acp-mach-common.c  |  86 +++++-
>   sound/soc/amd/acp/acp-mach.h         |   6 +
>   sound/soc/amd/acp/acp-pci.c          |   6 +
>   sound/soc/amd/acp/acp-platform.c     |  16 +-
>   sound/soc/amd/acp/acp-rembrandt.c    | 401 +++++++++++++++++++++++++++
>   sound/soc/amd/acp/amd.h              |  62 ++++-
>   sound/soc/amd/acp/chip_offset_byte.h |  28 ++
>   11 files changed, 781 insertions(+), 6 deletions(-)
>   create mode 100644 sound/soc/amd/acp/acp-rembrandt.c
> 

[...]

> diff --git a/sound/soc/amd/acp/acp-rembrandt.c b/sound/soc/amd/acp/acp-rembrandt.c
> new file mode 100644
> index 000000000000..2b57c0ca4e99
> --- /dev/null
> +++ b/sound/soc/amd/acp/acp-rembrandt.c
> @@ -0,0 +1,401 @@
> +// SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause)
> +//
> +// This file is provided under a dual BSD/GPLv2 license. When using or
> +// redistributing this file, you may do so under either license.

These lines are useless. There is already a SPDX-License-Identifier just 
above.

> +//
> +// Copyright(c) 2022 Advanced Micro Devices, Inc.
> +//
> +// Authors: Ajit Kumar Pandey <AjitKumar.Pandey@....com>
> +//          V sujith kumar Reddy <Vsujithkumar.Reddy@....com>
> +/*
> + * Hardware interface for Renoir ACP block
> + */
> +

[...]

> +static int rembrandt_audio_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct acp_chip_info *chip;
> +	struct acp_dev_data *adata;
> +	struct resource *res;
> +
> +	chip = dev_get_platdata(&pdev->dev);
> +	if (!chip || !chip->base) {
> +		dev_err(&pdev->dev, "ACP chip data is NULL\n");
> +		return -ENODEV;
> +	}
> +
> +	if (chip->acp_rev != ACP6X_DEV) {
> +		dev_err(&pdev->dev, "Un-supported ACP Revision %d\n", chip->acp_rev);
> +		return -ENODEV;
> +	}
> +
> +	rmb_acp_init(chip->base);

Should rmb_acp_deinit() be called if an error occurs below?
Or a devm_add_action_or_reset() + .remove() simplification?

(this is called in the .remove() function)

> +
> +	adata = devm_kzalloc(dev, sizeof(struct acp_dev_data), GFP_KERNEL);
> +	if (!adata)
> +		return -ENOMEM;
> +
> +	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "acp_mem");
> +	if (!res) {
> +		dev_err(&pdev->dev, "IORESOURCE_MEM FAILED\n");
> +		return -ENODEV;
> +	}
> +
> +	adata->acp_base = devm_ioremap(&pdev->dev, res->start, resource_size(res));
> +	if (!adata->acp_base)
> +		return -ENOMEM;
> +
> +	res = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "acp_dai_irq");
> +	if (!res) {
> +		dev_err(&pdev->dev, "IORESOURCE_IRQ FAILED\n");
> +		return -ENODEV;
> +	}
> +
> +	adata->i2s_irq = res->start;
> +	adata->dev = dev;
> +	adata->dai_driver = acp_rmb_dai;
> +	adata->num_dai = ARRAY_SIZE(acp_rmb_dai);
> +	adata->rsrc = &rsrc;
> +
> +	adata->machines = snd_soc_acpi_amd_rmb_acp_machines;
> +	acp_machine_select(adata);
> +
> +	dev_set_drvdata(dev, adata);
> +	acp6x_enable_interrupts(adata);
> +	acp_platform_register(dev);
> +
> +	return 0;
> +}
> +
> +static int rembrandt_audio_remove(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct acp_dev_data *adata = dev_get_drvdata(dev);
> +	struct acp_chip_info *chip;
> +
> +	chip = dev_get_platdata(&pdev->dev);
> +	if (!chip || !chip->base) {
> +		dev_err(&pdev->dev, "ACP chip data is NULL\n");
> +		return -ENODEV;
> +	}

These tests and dev_err and return look useless.
The same is already tested at the biginning of the probe and if it 
fails, the probe will fail, right?

> +
> +	rmb_acp_deinit(chip->base);
> +
> +	acp6x_disable_interrupts(adata);
> +	acp_platform_unregister(dev);
> +	return 0;
> +}

[...]