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2761ba6c09
Current dw-hdmi is supporting sound via AHB bus, but it has I2S audio feature too. This patch adds I2S audio support to dw-hdmi. This HDMI I2S is supported by using ALSA SoC common HDMI encoder driver. Tested-by: Jose Abreu <joabreu@synopsys.com> Acked-by: Russell King <rmk+kernel@armlinux.org.uk> Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> Signed-off-by: Archit Taneja <architt@codeaurora.org> Link: http://patchwork.freedesktop.org/patch/msgid/8737j2bxba.wl%kuninori.morimoto.gx@renesas.com
141 lines
3.4 KiB
C
141 lines
3.4 KiB
C
/*
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* dw-hdmi-i2s-audio.c
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*
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* Copyright (c) 2016 Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <drm/bridge/dw_hdmi.h>
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#include <sound/hdmi-codec.h>
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#include "dw-hdmi.h"
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#include "dw-hdmi-audio.h"
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#define DRIVER_NAME "dw-hdmi-i2s-audio"
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static inline void hdmi_write(struct dw_hdmi_i2s_audio_data *audio,
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u8 val, int offset)
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{
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struct dw_hdmi *hdmi = audio->hdmi;
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audio->write(hdmi, val, offset);
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}
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static inline u8 hdmi_read(struct dw_hdmi_i2s_audio_data *audio, int offset)
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{
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struct dw_hdmi *hdmi = audio->hdmi;
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return audio->read(hdmi, offset);
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}
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static int dw_hdmi_i2s_hw_params(struct device *dev, void *data,
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struct hdmi_codec_daifmt *fmt,
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struct hdmi_codec_params *hparms)
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{
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struct dw_hdmi_i2s_audio_data *audio = data;
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struct dw_hdmi *hdmi = audio->hdmi;
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u8 conf0 = 0;
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u8 conf1 = 0;
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u8 inputclkfs = 0;
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/* it cares I2S only */
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if ((fmt->fmt != HDMI_I2S) ||
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(fmt->bit_clk_master | fmt->frame_clk_master)) {
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dev_err(dev, "unsupported format/settings\n");
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return -EINVAL;
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}
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inputclkfs = HDMI_AUD_INPUTCLKFS_64FS;
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conf0 = HDMI_AUD_CONF0_I2S_ALL_ENABLE;
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switch (hparms->sample_width) {
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case 16:
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conf1 = HDMI_AUD_CONF1_WIDTH_16;
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break;
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case 24:
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case 32:
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conf1 = HDMI_AUD_CONF1_WIDTH_24;
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break;
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}
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dw_hdmi_set_sample_rate(hdmi, hparms->sample_rate);
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hdmi_write(audio, inputclkfs, HDMI_AUD_INPUTCLKFS);
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hdmi_write(audio, conf0, HDMI_AUD_CONF0);
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hdmi_write(audio, conf1, HDMI_AUD_CONF1);
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dw_hdmi_audio_enable(hdmi);
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return 0;
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}
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static void dw_hdmi_i2s_audio_shutdown(struct device *dev, void *data)
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{
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struct dw_hdmi_i2s_audio_data *audio = data;
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struct dw_hdmi *hdmi = audio->hdmi;
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dw_hdmi_audio_disable(hdmi);
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hdmi_write(audio, HDMI_AUD_CONF0_SW_RESET, HDMI_AUD_CONF0);
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}
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static struct hdmi_codec_ops dw_hdmi_i2s_ops = {
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.hw_params = dw_hdmi_i2s_hw_params,
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.audio_shutdown = dw_hdmi_i2s_audio_shutdown,
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};
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static int snd_dw_hdmi_probe(struct platform_device *pdev)
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{
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struct dw_hdmi_i2s_audio_data *audio = pdev->dev.platform_data;
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struct platform_device_info pdevinfo;
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struct hdmi_codec_pdata pdata;
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struct platform_device *platform;
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pdata.ops = &dw_hdmi_i2s_ops;
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pdata.i2s = 1;
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pdata.max_i2s_channels = 6;
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pdata.data = audio;
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memset(&pdevinfo, 0, sizeof(pdevinfo));
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pdevinfo.parent = pdev->dev.parent;
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pdevinfo.id = PLATFORM_DEVID_AUTO;
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pdevinfo.name = HDMI_CODEC_DRV_NAME;
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pdevinfo.data = &pdata;
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pdevinfo.size_data = sizeof(pdata);
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pdevinfo.dma_mask = DMA_BIT_MASK(32);
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platform = platform_device_register_full(&pdevinfo);
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if (IS_ERR(platform))
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return PTR_ERR(platform);
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dev_set_drvdata(&pdev->dev, platform);
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return 0;
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}
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static int snd_dw_hdmi_remove(struct platform_device *pdev)
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{
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struct platform_device *platform = dev_get_drvdata(&pdev->dev);
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platform_device_unregister(platform);
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return 0;
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}
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static struct platform_driver snd_dw_hdmi_driver = {
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.probe = snd_dw_hdmi_probe,
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.remove = snd_dw_hdmi_remove,
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.driver = {
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.name = DRIVER_NAME,
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.owner = THIS_MODULE,
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},
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};
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module_platform_driver(snd_dw_hdmi_driver);
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MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");
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MODULE_DESCRIPTION("Synopsis Designware HDMI I2S ALSA SoC interface");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS("platform:" DRIVER_NAME);
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