From: Allen Chen <allen.c...@ite.com.tw>
Bridge to hdmi-codec to support audio feature.
It is observed that some DP-to-HDMI dongles will get into bad states
if sending InfoFrame without audio data. Defer to enable it6505's
audio feature when PCM triggers START or RESUME.
Signed-off-by: Allen Chen <allen.c...@ite.com.tw>
Signed-off-by: Tzung-Bi Shih <tzun...@google.com>
---
drivers/gpu/drm/bridge/ite-it6505.c | 152 ++++++++++++++++++++++++++++
1 file changed, 152 insertions(+)
diff --git a/drivers/gpu/drm/bridge/ite-it6505.c
b/drivers/gpu/drm/bridge/ite-it6505.c
index 5e046f677343..1d19184d2056 100644
--- a/drivers/gpu/drm/bridge/ite-it6505.c
+++ b/drivers/gpu/drm/bridge/ite-it6505.c
@@ -26,6 +26,8 @@
#include <drm/drm_dp_helper.h>
#include <drm/drm_edid.h>
+#include <sound/hdmi-codec.h>
+
#define AX 0
#define BX 1
#define AUDSEL I2S
@@ -146,6 +148,7 @@ struct it6505 {
struct notifier_block event_nb;
struct extcon_dev *extcon;
struct work_struct extcon_wq;
+ struct delayed_work delayed_audio;
enum sys_status status;
bool hbr;
u8 en_ssc;
@@ -1223,6 +1226,149 @@ static void it6505_set_audio(struct it6505 *it6505)
dptxset(it6505, 0xD3, 0x20, 0x00);
}
+static void it6505_delayed_audio(struct work_struct *work)
+{
+ struct it6505 *it6505 = container_of(work, struct it6505,
+ delayed_audio.work);
+
+ it6505_set_audio(it6505);
+ it6505->en_audio = 1;
+}
+
+static int it6505_audio_hw_params(struct device *dev, void *data,
+ struct hdmi_codec_daifmt *daifmt,
+ struct hdmi_codec_params *params)
+{
+ struct it6505 *it6505 = dev_get_drvdata(dev);
+ unsigned int channel_num = params->cea.channels;
+
+ DRM_DEV_DEBUG_DRIVER(dev, "setting %d Hz, %d bit, %d channels\n",
+ params->sample_rate, params->sample_width,
+ channel_num);
+
+ if (!it6505->bridge.encoder)
+ return -ENODEV;
+
+ switch (params->sample_rate) {
+ case 24000:
+ it6505->aud_fs = AUD24K;
+ break;
+ case 32000:
+ it6505->aud_fs = AUD32K;
+ break;
+ case 44100:
+ it6505->aud_fs = AUD44P1K;
+ break;
+ case 48000:
+ it6505->aud_fs = AUD48K;
+ break;
+ case 88200:
+ it6505->aud_fs = AUD88P2K;
+ break;
+ case 96000:
+ it6505->aud_fs = AUD96K;
+ break;
+ case 176400:
+ it6505->aud_fs = AUD176P4K;
+ break;
+ case 192000:
+ it6505->aud_fs = AUD192K;
+ break;
+ default:
+ DRM_DEV_DEBUG_DRIVER(dev, "sample rate: %d Hz not support",
+ params->sample_rate);
+ return -EINVAL;
+ }
+
+ switch (params->sample_width) {
+ case 16:
+ it6505->audwordlength = AUD16BIT;
+ break;
+ case 18:
+ it6505->audwordlength = AUD18BIT;
+ break;
+ case 20:
+ it6505->audwordlength = AUD20BIT;
+ break;
+ case 24:
+ case 32:
+ it6505->audwordlength = AUD24BIT;
+ break;
+ default:
+ DRM_DEV_DEBUG_DRIVER(dev, "wordlength: %d bit not support",
+ params->sample_width);
+ return -EINVAL;
+ }
+
+ if (channel_num == 0 || channel_num % 2) {
+ DRM_DEV_DEBUG_DRIVER(dev, "channel number: %d not support",
+ channel_num);
+ return -EINVAL;
+ }
+ it6505->aud_ch = channel_num;
+
+ return 0;
+}
+
+static int it6505_audio_trigger(struct device *dev, int event)
+{
+ struct it6505 *it6505 = dev_get_drvdata(dev);
+
+ DRM_DEV_DEBUG_DRIVER(dev, "event: %d", event);
+ switch (event) {
+ case HDMI_CODEC_TRIGGER_EVENT_START:
+ case HDMI_CODEC_TRIGGER_EVENT_RESUME:
+ queue_delayed_work(system_wq, &it6505->delayed_audio,
+ msecs_to_jiffies(180));
+ break;
+ case HDMI_CODEC_TRIGGER_EVENT_STOP:
+ case HDMI_CODEC_TRIGGER_EVENT_SUSPEND:
+ cancel_delayed_work(&it6505->delayed_audio);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static void it6505_audio_shutdown(struct device *dev, void *data)
+{
+ struct it6505 *it6505 = dev_get_drvdata(dev);
+
+ dptxset(it6505, 0xE8, 0x22, 0x00);
+ dptxset(it6505, 0x05, 0x02, 0x02);
+ it6505->en_audio = 0;
+}
+
+static const struct hdmi_codec_ops it6505_audio_codec_ops = {
+ .hw_params = it6505_audio_hw_params,
+ .trigger = it6505_audio_trigger,
+ .audio_shutdown = it6505_audio_shutdown,
+};
+
+static int it6505_register_audio_driver(struct device *dev)
+{
+ struct it6505 *it6505 = dev_get_drvdata(dev);
+ struct hdmi_codec_pdata codec_data = {
+ .ops = &it6505_audio_codec_ops,
+ .max_i2s_channels = 8,
+ .i2s = 1,
+ };
+ struct platform_device *pdev;
+
+ pdev = platform_device_register_data(dev, HDMI_CODEC_DRV_NAME,
+ PLATFORM_DEVID_AUTO, &codec_data,
+ sizeof(codec_data));
+ if (IS_ERR(pdev))
+ return PTR_ERR(pdev);
+
+ INIT_DELAYED_WORK(&it6505->delayed_audio, it6505_delayed_audio);
+
+ DRM_DEV_DEBUG_DRIVER(dev, "bound to %s", HDMI_CODEC_DRV_NAME);
+ return 0;
+}
+
/***************************************************************************
* DPCD Read and EDID
***************************************************************************/
@@ -2460,6 +2606,12 @@ static int it6505_i2c_probe(struct i2c_client *client,
return err;
}
+ err = it6505_register_audio_driver(dev);
+ if (err < 0) {
+ DRM_DEV_ERROR(dev, "Failed to register audio driver: %d", err);
+ return err;
+ }
+
/* Register aux channel */
it6505->aux.name = "DP-AUX";
it6505->aux.dev = dev;
--
2.23.0.866.gb869b98d4c-goog
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