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Date:   Sat, 11 Nov 2023 09:16:26 +0100
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Shengjiu Wang <shengjiu.wang@....com>, hverkuil@...all.nl,
        sakari.ailus@....fi, tfiga@...omium.org, m.szyprowski@...sung.com,
        mchehab@...nel.org, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org, shengjiu.wang@...il.com,
        Xiubo.Lee@...il.com, festevam@...il.com, nicoleotsuka@...il.com,
        lgirdwood@...il.com, broonie@...nel.org, perex@...ex.cz,
        tiwai@...e.com, alsa-devel@...a-project.org,
        linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v9 14/15] media: imx-asrc: Add memory to memory driver

On 10/11/2023 06:48, Shengjiu Wang wrote:
> +static int asrc_m2m_probe(struct platform_device *pdev)
> +{
> +	struct fsl_asrc_m2m_pdata *data = pdev->dev.platform_data;
> +	struct device *dev = &pdev->dev;
> +	struct asrc_m2m *m2m;
> +	int ret;
> +
> +	m2m = devm_kzalloc(dev, sizeof(struct asrc_m2m), GFP_KERNEL);

sizeof(*)

> +	if (!m2m)
> +		return -ENOMEM;
> +
> +	m2m->pdata = *data;
> +	m2m->pdev = pdev;
> +
> +	ret = v4l2_device_register(dev, &m2m->v4l2_dev);
> +	if (ret) {
> +		dev_err(dev, "failed to register v4l2 device\n");
> +		goto err_register;
> +	}
> +
> +	m2m->m2m_dev = v4l2_m2m_init(&asrc_m2m_ops);
> +	if (IS_ERR(m2m->m2m_dev)) {
> +		dev_err(dev, "failed to register v4l2 device\n");

Why aren't you using dev_err_probe() at all?

> +		ret = PTR_ERR(m2m->m2m_dev);
> +		goto err_m2m;
> +	}
> +
> +	m2m->dec_vdev = video_device_alloc();
> +	if (!m2m->dec_vdev) {
> +		dev_err(dev, "failed to register v4l2 device\n");

Why do you print errors on ENOMEM?

Did you run coccinelle?

> +		ret = -ENOMEM;
> +		goto err_vdev_alloc;
> +	}
> +
> +	mutex_init(&m2m->mlock);
> +
> +	m2m->dec_vdev->fops = &asrc_m2m_fops;
> +	m2m->dec_vdev->ioctl_ops = &asrc_m2m_ioctl_ops;
> +	m2m->dec_vdev->minor = -1;
> +	m2m->dec_vdev->release = video_device_release;
> +	m2m->dec_vdev->lock = &m2m->mlock; /* lock for ioctl serialization */
> +	m2m->dec_vdev->v4l2_dev = &m2m->v4l2_dev;
> +	m2m->dec_vdev->vfl_dir = VFL_DIR_M2M;
> +	m2m->dec_vdev->device_caps = V4L2_CAP_STREAMING | V4L2_CAP_AUDIO_M2M;
> +
> +#ifdef CONFIG_MEDIA_CONTROLLER
> +	m2m->mdev.dev = &pdev->dev;
> +	strscpy(m2m->mdev.model, M2M_DRV_NAME, sizeof(m2m->mdev.model));
> +	snprintf(m2m->mdev.bus_info, sizeof(m2m->mdev.bus_info),
> +		 "platform:%s", M2M_DRV_NAME);
> +	media_device_init(&m2m->mdev);
> +	m2m->mdev.ops = &asrc_m2m_media_ops;
> +	m2m->v4l2_dev.mdev = &m2m->mdev;
> +#endif
> +
> +	ret = video_register_device(m2m->dec_vdev, VFL_TYPE_AUDIO, -1);
> +	if (ret) {
> +		dev_err(dev, "failed to register video device\n");
> +		goto err_vdev_register;
> +	}
> +
> +#ifdef CONFIG_MEDIA_CONTROLLER
> +	ret = v4l2_m2m_register_media_controller(m2m->m2m_dev, m2m->dec_vdev,
> +						 MEDIA_ENT_F_PROC_AUDIO_RESAMPLER);
> +	if (ret) {
> +		dev_err(dev, "Failed to init mem2mem media controller\n");
> +		goto error_v4l2;
> +	}
> +
> +	ret = media_device_register(&m2m->mdev);
> +	if (ret) {
> +		dev_err(dev, "Failed to register mem2mem media device\n");
> +		goto error_m2m_mc;
> +	}
> +#endif
> +
> +	video_set_drvdata(m2m->dec_vdev, m2m);
> +	platform_set_drvdata(pdev, m2m);
> +	pm_runtime_enable(&pdev->dev);
> +
> +	return 0;
> +
> +#ifdef CONFIG_MEDIA_CONTROLLER
> +error_m2m_mc:
> +	v4l2_m2m_unregister_media_controller(m2m->m2m_dev);
> +#endif
> +error_v4l2:
> +	video_unregister_device(m2m->dec_vdev);
> +err_vdev_register:
> +	video_device_release(m2m->dec_vdev);
> +err_vdev_alloc:
> +	v4l2_m2m_release(m2m->m2m_dev);
> +err_m2m:
> +	v4l2_device_unregister(&m2m->v4l2_dev);
> +err_register:
> +	return ret;
> +}
> +
> +static void asrc_m2m_remove(struct platform_device *pdev)
> +{
> +	struct asrc_m2m *m2m = platform_get_drvdata(pdev);
> +
> +	pm_runtime_disable(&pdev->dev);
> +#ifdef CONFIG_MEDIA_CONTROLLER
> +	media_device_unregister(&m2m->mdev);
> +	v4l2_m2m_unregister_media_controller(m2m->m2m_dev);
> +#endif
> +	video_unregister_device(m2m->dec_vdev);
> +	video_device_release(m2m->dec_vdev);
> +	v4l2_m2m_release(m2m->m2m_dev);
> +	v4l2_device_unregister(&m2m->v4l2_dev);
> +}
> +
> +#ifdef CONFIG_PM_SLEEP
> +/* suspend callback for m2m */
> +static int asrc_m2m_suspend(struct device *dev)
> +{
> +	struct asrc_m2m *m2m = dev_get_drvdata(dev);
> +	struct fsl_asrc *asrc = m2m->pdata.asrc;
> +	struct fsl_asrc_pair *pair;
> +	unsigned long lock_flags;
> +	int i;
> +
> +	for (i = 0; i < PAIR_CTX_NUM; i++) {
> +		spin_lock_irqsave(&asrc->lock, lock_flags);
> +		pair = asrc->pair[i];
> +		if (!pair || !pair->req_pair) {
> +			spin_unlock_irqrestore(&asrc->lock, lock_flags);
> +			continue;
> +		}
> +		if (!completion_done(&pair->complete[V4L_OUT])) {
> +			if (pair->dma_chan[V4L_OUT])
> +				dmaengine_terminate_all(pair->dma_chan[V4L_OUT]);
> +			asrc_input_dma_callback((void *)pair);
> +		}
> +		if (!completion_done(&pair->complete[V4L_CAP])) {
> +			if (pair->dma_chan[V4L_CAP])
> +				dmaengine_terminate_all(pair->dma_chan[V4L_CAP]);
> +			asrc_output_dma_callback((void *)pair);
> +		}
> +
> +		if (asrc->m2m_pair_suspend)
> +			asrc->m2m_pair_suspend(pair);
> +
> +		spin_unlock_irqrestore(&asrc->lock, lock_flags);
> +	}
> +
> +	return 0;
> +}
> +
> +static int asrc_m2m_resume(struct device *dev)
> +{
> +	struct asrc_m2m *m2m = dev_get_drvdata(dev);
> +	struct fsl_asrc *asrc = m2m->pdata.asrc;
> +	struct fsl_asrc_pair *pair;
> +	unsigned long lock_flags;
> +	int i;
> +
> +	for (i = 0; i < PAIR_CTX_NUM; i++) {
> +		spin_lock_irqsave(&asrc->lock, lock_flags);
> +		pair = asrc->pair[i];
> +		if (!pair || !pair->req_pair) {
> +			spin_unlock_irqrestore(&asrc->lock, lock_flags);
> +			continue;
> +		}
> +		if (asrc->m2m_pair_resume)
> +			asrc->m2m_pair_resume(pair);
> +
> +		spin_unlock_irqrestore(&asrc->lock, lock_flags);
> +	}
> +
> +	return 0;
> +}
> +#endif
> +
> +static const struct dev_pm_ops asrc_m2m_pm_ops = {
> +	SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(asrc_m2m_suspend,
> +				      asrc_m2m_resume)
> +};
> +
> +static struct platform_driver asrc_m2m_driver = {
> +	.probe  = asrc_m2m_probe,
> +	.remove_new = asrc_m2m_remove,
> +	.driver = {
> +		.name = M2M_DRV_NAME,
> +		.pm = &asrc_m2m_pm_ops,
> +	},
> +};
> +module_platform_driver(asrc_m2m_driver);
> +
> +MODULE_DESCRIPTION("Freescale ASRC M2M driver");
> +MODULE_ALIAS("platform:" M2M_DRV_NAME);

You should not need MODULE_ALIAS() in normal cases. If you need it,
usually it means your device ID table is wrong (e.g. misses either
entries or MODULE_DEVICE_TABLE()). MODULE_ALIAS() is not a substitute
for incomplete ID table.


> +MODULE_LICENSE("GPL");

Best regards,
Krzysztof

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