diff options
Diffstat (limited to 'sound/soc/tegra/tegra_isomgr_bw.c')
| -rw-r--r-- | sound/soc/tegra/tegra_isomgr_bw.c | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/sound/soc/tegra/tegra_isomgr_bw.c b/sound/soc/tegra/tegra_isomgr_bw.c new file mode 100644 index 000000000000..fa979960bc09 --- /dev/null +++ b/sound/soc/tegra/tegra_isomgr_bw.c @@ -0,0 +1,130 @@ +// SPDX-License-Identifier: GPL-2.0-only +// SPDX-FileCopyrightText: Copyright (c) 2025 NVIDIA CORPORATION & AFFILIATES. +// All rights reserved. +// +// ADMA bandwidth calculation + +#include <linux/interconnect.h> +#include <linux/module.h> +#include <sound/pcm_params.h> +#include <sound/soc.h> +#include "tegra_isomgr_bw.h" +#include "tegra210_admaif.h" + +#define MAX_SAMPLE_RATE 192 /* KHz*/ +#define MAX_BYTES_PER_SAMPLE 4 + +int tegra_isomgr_adma_setbw(struct snd_pcm_substream *substream, + struct snd_soc_dai *dai, bool is_running) +{ + struct device *dev = dai->dev; + struct tegra_admaif *admaif = snd_soc_dai_get_drvdata(dai); + struct tegra_adma_isomgr *adma_isomgr = admaif->adma_isomgr; + struct snd_pcm_runtime *runtime = substream->runtime; + struct snd_pcm *pcm = substream->pcm; + u32 type = substream->stream, bandwidth = 0; + int sample_bytes; + + if (!adma_isomgr) + return 0; + + if (!runtime || !pcm) + return -EINVAL; + + if (pcm->device >= adma_isomgr->max_pcm_device) { + dev_err(dev, "%s: PCM device number %d is greater than %d\n", __func__, + pcm->device, adma_isomgr->max_pcm_device); + return -EINVAL; + } + + /* + * No action if stream is running and bandwidth is already set or + * stream is not running and bandwidth is already reset + */ + if ((adma_isomgr->bw_per_dev[type][pcm->device] && is_running) || + (!adma_isomgr->bw_per_dev[type][pcm->device] && !is_running)) + return 0; + + if (is_running) { + sample_bytes = snd_pcm_format_width(runtime->format) / 8; + if (sample_bytes < 0) + return sample_bytes; + + /* KB/s kilo bytes per sec */ + bandwidth = runtime->channels * (runtime->rate / 1000) * + sample_bytes; + } + + mutex_lock(&adma_isomgr->mutex); + + if (is_running) { + if (bandwidth + adma_isomgr->current_bandwidth > adma_isomgr->max_bw) + bandwidth = adma_isomgr->max_bw - adma_isomgr->current_bandwidth; + + adma_isomgr->current_bandwidth += bandwidth; + } else { + adma_isomgr->current_bandwidth -= adma_isomgr->bw_per_dev[type][pcm->device]; + } + + mutex_unlock(&adma_isomgr->mutex); + + adma_isomgr->bw_per_dev[type][pcm->device] = bandwidth; + + dev_dbg(dev, "Setting up bandwidth to %d KBps\n", adma_isomgr->current_bandwidth); + + return icc_set_bw(adma_isomgr->icc_path_handle, + adma_isomgr->current_bandwidth, adma_isomgr->max_bw); +} + +int tegra_isomgr_adma_register(struct device *dev) +{ + struct tegra_admaif *admaif = dev_get_drvdata(dev); + struct tegra_adma_isomgr *adma_isomgr; + int i; + + adma_isomgr = devm_kzalloc(dev, sizeof(struct tegra_adma_isomgr), GFP_KERNEL); + if (!adma_isomgr) + return -ENOMEM; + + adma_isomgr->icc_path_handle = devm_of_icc_get(dev, "write"); + if (IS_ERR(adma_isomgr->icc_path_handle)) + return dev_err_probe(dev, PTR_ERR(adma_isomgr->icc_path_handle), + "failed to acquire interconnect path\n"); + + /* Either INTERCONNECT config OR interconnect property is not defined */ + if (!adma_isomgr->icc_path_handle) { + devm_kfree(dev, adma_isomgr); + return 0; + } + + adma_isomgr->max_pcm_device = admaif->soc_data->num_ch; + adma_isomgr->max_bw = STREAM_TYPE * MAX_SAMPLE_RATE * MAX_BYTES_PER_SAMPLE * + admaif->soc_data->max_stream_ch * adma_isomgr->max_pcm_device; + + for (i = 0; i < STREAM_TYPE; i++) { + adma_isomgr->bw_per_dev[i] = devm_kzalloc(dev, adma_isomgr->max_pcm_device * + sizeof(u32), GFP_KERNEL); + if (!adma_isomgr->bw_per_dev[i]) + return -ENOMEM; + } + + adma_isomgr->current_bandwidth = 0; + mutex_init(&adma_isomgr->mutex); + admaif->adma_isomgr = adma_isomgr; + + return 0; +} + +void tegra_isomgr_adma_unregister(struct device *dev) +{ + struct tegra_admaif *admaif = dev_get_drvdata(dev); + + if (!admaif->adma_isomgr) + return; + + mutex_destroy(&admaif->adma_isomgr->mutex); +} + +MODULE_AUTHOR("Mohan Kumar <mkumard@nvidia.com>"); +MODULE_DESCRIPTION("Tegra ADMA Bandwidth Request driver"); +MODULE_LICENSE("GPL"); |