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path: root/drivers/gpu/drm/msm/dp/dp_audio.c
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Diffstat (limited to 'drivers/gpu/drm/msm/dp/dp_audio.c')
-rw-r--r--drivers/gpu/drm/msm/dp/dp_audio.c638
1 files changed, 638 insertions, 0 deletions
diff --git a/drivers/gpu/drm/msm/dp/dp_audio.c b/drivers/gpu/drm/msm/dp/dp_audio.c
new file mode 100644
index 000000000000..82a8673ab8da
--- /dev/null
+++ b/drivers/gpu/drm/msm/dp/dp_audio.c
@@ -0,0 +1,638 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2016-2020, The Linux Foundation. All rights reserved.
+ */
+
+
+#define pr_fmt(fmt)	"[drm-dp] %s: " fmt, __func__
+
+#include <linux/of_platform.h>
+
+#include <drm/drm_dp_helper.h>
+#include <drm/drm_edid.h>
+
+#include "dp_catalog.h"
+#include "dp_audio.h"
+#include "dp_panel.h"
+#include "dp_display.h"
+
+#define HEADER_BYTE_2_BIT	 0
+#define PARITY_BYTE_2_BIT	 8
+#define HEADER_BYTE_1_BIT	16
+#define PARITY_BYTE_1_BIT	24
+#define HEADER_BYTE_3_BIT	16
+#define PARITY_BYTE_3_BIT	24
+
+struct dp_audio_private {
+	struct platform_device *audio_pdev;
+	struct platform_device *pdev;
+	struct dp_catalog *catalog;
+	struct dp_panel *panel;
+
+	bool engine_on;
+	u32 channels;
+
+	struct dp_audio dp_audio;
+};
+
+static u8 dp_audio_get_g0_value(u8 data)
+{
+	u8 c[4];
+	u8 g[4];
+	u8 ret_data = 0;
+	u8 i;
+
+	for (i = 0; i < 4; i++)
+		c[i] = (data >> i) & 0x01;
+
+	g[0] = c[3];
+	g[1] = c[0] ^ c[3];
+	g[2] = c[1];
+	g[3] = c[2];
+
+	for (i = 0; i < 4; i++)
+		ret_data = ((g[i] & 0x01) << i) | ret_data;
+
+	return ret_data;
+}
+
+static u8 dp_audio_get_g1_value(u8 data)
+{
+	u8 c[4];
+	u8 g[4];
+	u8 ret_data = 0;
+	u8 i;
+
+	for (i = 0; i < 4; i++)
+		c[i] = (data >> i) & 0x01;
+
+	g[0] = c[0] ^ c[3];
+	g[1] = c[0] ^ c[1] ^ c[3];
+	g[2] = c[1] ^ c[2];
+	g[3] = c[2] ^ c[3];
+
+	for (i = 0; i < 4; i++)
+		ret_data = ((g[i] & 0x01) << i) | ret_data;
+
+	return ret_data;
+}
+
+static u8 dp_audio_calculate_parity(u32 data)
+{
+	u8 x0 = 0;
+	u8 x1 = 0;
+	u8 ci = 0;
+	u8 iData = 0;
+	u8 i = 0;
+	u8 parity_byte;
+	u8 num_byte = (data & 0xFF00) > 0 ? 8 : 2;
+
+	for (i = 0; i < num_byte; i++) {
+		iData = (data >> i*4) & 0xF;
+
+		ci = iData ^ x1;
+		x1 = x0 ^ dp_audio_get_g1_value(ci);
+		x0 = dp_audio_get_g0_value(ci);
+	}
+
+	parity_byte = x1 | (x0 << 4);
+
+	return parity_byte;
+}
+
+static u32 dp_audio_get_header(struct dp_catalog *catalog,
+		enum dp_catalog_audio_sdp_type sdp,
+		enum dp_catalog_audio_header_type header)
+{
+	catalog->sdp_type = sdp;
+	catalog->sdp_header = header;
+	dp_catalog_audio_get_header(catalog);
+
+	return catalog->audio_data;
+}
+
+static void dp_audio_set_header(struct dp_catalog *catalog,
+		u32 data,
+		enum dp_catalog_audio_sdp_type sdp,
+		enum dp_catalog_audio_header_type header)
+{
+	catalog->sdp_type = sdp;
+	catalog->sdp_header = header;
+	catalog->audio_data = data;
+	dp_catalog_audio_set_header(catalog);
+}
+
+static void dp_audio_stream_sdp(struct dp_audio_private *audio)
+{
+	struct dp_catalog *catalog = audio->catalog;
+	u32 value, new_value;
+	u8 parity_byte;
+
+	/* Config header and parity byte 1 */
+	value = dp_audio_get_header(catalog,
+			DP_AUDIO_SDP_STREAM, DP_AUDIO_SDP_HEADER_1);
+
+	new_value = 0x02;
+	parity_byte = dp_audio_calculate_parity(new_value);
+	value |= ((new_value << HEADER_BYTE_1_BIT)
+			| (parity_byte << PARITY_BYTE_1_BIT));
+	DRM_DEBUG_DP("Header Byte 1: value = 0x%x, parity_byte = 0x%x\n",
+			value, parity_byte);
+	dp_audio_set_header(catalog, value,
+		DP_AUDIO_SDP_STREAM, DP_AUDIO_SDP_HEADER_1);
+
+	/* Config header and parity byte 2 */
+	value = dp_audio_get_header(catalog,
+			DP_AUDIO_SDP_STREAM, DP_AUDIO_SDP_HEADER_2);
+	new_value = value;
+	parity_byte = dp_audio_calculate_parity(new_value);
+	value |= ((new_value << HEADER_BYTE_2_BIT)
+			| (parity_byte << PARITY_BYTE_2_BIT));
+	DRM_DEBUG_DP("Header Byte 2: value = 0x%x, parity_byte = 0x%x\n",
+			value, parity_byte);
+
+	dp_audio_set_header(catalog, value,
+		DP_AUDIO_SDP_STREAM, DP_AUDIO_SDP_HEADER_2);
+
+	/* Config header and parity byte 3 */
+	value = dp_audio_get_header(catalog,
+			DP_AUDIO_SDP_STREAM, DP_AUDIO_SDP_HEADER_3);
+
+	new_value = audio->channels - 1;
+	parity_byte = dp_audio_calculate_parity(new_value);
+	value |= ((new_value << HEADER_BYTE_3_BIT)
+			| (parity_byte << PARITY_BYTE_3_BIT));
+	DRM_DEBUG_DP("Header Byte 3: value = 0x%x, parity_byte = 0x%x\n",
+		value, parity_byte);
+
+	dp_audio_set_header(catalog, value,
+		DP_AUDIO_SDP_STREAM, DP_AUDIO_SDP_HEADER_3);
+}
+
+static void dp_audio_timestamp_sdp(struct dp_audio_private *audio)
+{
+	struct dp_catalog *catalog = audio->catalog;
+	u32 value, new_value;
+	u8 parity_byte;
+
+	/* Config header and parity byte 1 */
+	value = dp_audio_get_header(catalog,
+			DP_AUDIO_SDP_TIMESTAMP, DP_AUDIO_SDP_HEADER_1);
+
+	new_value = 0x1;
+	parity_byte = dp_audio_calculate_parity(new_value);
+	value |= ((new_value << HEADER_BYTE_1_BIT)
+			| (parity_byte << PARITY_BYTE_1_BIT));
+	DRM_DEBUG_DP("Header Byte 1: value = 0x%x, parity_byte = 0x%x\n",
+		value, parity_byte);
+	dp_audio_set_header(catalog, value,
+		DP_AUDIO_SDP_TIMESTAMP, DP_AUDIO_SDP_HEADER_1);
+
+	/* Config header and parity byte 2 */
+	value = dp_audio_get_header(catalog,
+			DP_AUDIO_SDP_TIMESTAMP, DP_AUDIO_SDP_HEADER_2);
+
+	new_value = 0x17;
+	parity_byte = dp_audio_calculate_parity(new_value);
+	value |= ((new_value << HEADER_BYTE_2_BIT)
+			| (parity_byte << PARITY_BYTE_2_BIT));
+	DRM_DEBUG_DP("Header Byte 2: value = 0x%x, parity_byte = 0x%x\n",
+			value, parity_byte);
+	dp_audio_set_header(catalog, value,
+		DP_AUDIO_SDP_TIMESTAMP, DP_AUDIO_SDP_HEADER_2);
+
+	/* Config header and parity byte 3 */
+	value = dp_audio_get_header(catalog,
+			DP_AUDIO_SDP_TIMESTAMP, DP_AUDIO_SDP_HEADER_3);
+
+	new_value = (0x0 | (0x11 << 2));
+	parity_byte = dp_audio_calculate_parity(new_value);
+	value |= ((new_value << HEADER_BYTE_3_BIT)
+			| (parity_byte << PARITY_BYTE_3_BIT));
+	DRM_DEBUG_DP("Header Byte 3: value = 0x%x, parity_byte = 0x%x\n",
+			value, parity_byte);
+	dp_audio_set_header(catalog, value,
+		DP_AUDIO_SDP_TIMESTAMP, DP_AUDIO_SDP_HEADER_3);
+}
+
+static void dp_audio_infoframe_sdp(struct dp_audio_private *audio)
+{
+	struct dp_catalog *catalog = audio->catalog;
+	u32 value, new_value;
+	u8 parity_byte;
+
+	/* Config header and parity byte 1 */
+	value = dp_audio_get_header(catalog,
+			DP_AUDIO_SDP_INFOFRAME, DP_AUDIO_SDP_HEADER_1);
+
+	new_value = 0x84;
+	parity_byte = dp_audio_calculate_parity(new_value);
+	value |= ((new_value << HEADER_BYTE_1_BIT)
+			| (parity_byte << PARITY_BYTE_1_BIT));
+	DRM_DEBUG_DP("Header Byte 1: value = 0x%x, parity_byte = 0x%x\n",
+			value, parity_byte);
+	dp_audio_set_header(catalog, value,
+		DP_AUDIO_SDP_INFOFRAME, DP_AUDIO_SDP_HEADER_1);
+
+	/* Config header and parity byte 2 */
+	value = dp_audio_get_header(catalog,
+			DP_AUDIO_SDP_INFOFRAME, DP_AUDIO_SDP_HEADER_2);
+
+	new_value = 0x1b;
+	parity_byte = dp_audio_calculate_parity(new_value);
+	value |= ((new_value << HEADER_BYTE_2_BIT)
+			| (parity_byte << PARITY_BYTE_2_BIT));
+	DRM_DEBUG_DP("Header Byte 2: value = 0x%x, parity_byte = 0x%x\n",
+			value, parity_byte);
+	dp_audio_set_header(catalog, value,
+		DP_AUDIO_SDP_INFOFRAME, DP_AUDIO_SDP_HEADER_2);
+
+	/* Config header and parity byte 3 */
+	value = dp_audio_get_header(catalog,
+			DP_AUDIO_SDP_INFOFRAME, DP_AUDIO_SDP_HEADER_3);
+
+	new_value = (0x0 | (0x11 << 2));
+	parity_byte = dp_audio_calculate_parity(new_value);
+	value |= ((new_value << HEADER_BYTE_3_BIT)
+			| (parity_byte << PARITY_BYTE_3_BIT));
+	DRM_DEBUG_DP("Header Byte 3: value = 0x%x, parity_byte = 0x%x\n",
+			new_value, parity_byte);
+	dp_audio_set_header(catalog, value,
+		DP_AUDIO_SDP_INFOFRAME, DP_AUDIO_SDP_HEADER_3);
+}
+
+static void dp_audio_copy_management_sdp(struct dp_audio_private *audio)
+{
+	struct dp_catalog *catalog = audio->catalog;
+	u32 value, new_value;
+	u8 parity_byte;
+
+	/* Config header and parity byte 1 */
+	value = dp_audio_get_header(catalog,
+			DP_AUDIO_SDP_COPYMANAGEMENT, DP_AUDIO_SDP_HEADER_1);
+
+	new_value = 0x05;
+	parity_byte = dp_audio_calculate_parity(new_value);
+	value |= ((new_value << HEADER_BYTE_1_BIT)
+			| (parity_byte << PARITY_BYTE_1_BIT));
+	DRM_DEBUG_DP("Header Byte 1: value = 0x%x, parity_byte = 0x%x\n",
+			value, parity_byte);
+	dp_audio_set_header(catalog, value,
+		DP_AUDIO_SDP_COPYMANAGEMENT, DP_AUDIO_SDP_HEADER_1);
+
+	/* Config header and parity byte 2 */
+	value = dp_audio_get_header(catalog,
+			DP_AUDIO_SDP_COPYMANAGEMENT, DP_AUDIO_SDP_HEADER_2);
+
+	new_value = 0x0F;
+	parity_byte = dp_audio_calculate_parity(new_value);
+	value |= ((new_value << HEADER_BYTE_2_BIT)
+			| (parity_byte << PARITY_BYTE_2_BIT));
+	DRM_DEBUG_DP("Header Byte 2: value = 0x%x, parity_byte = 0x%x\n",
+			value, parity_byte);
+	dp_audio_set_header(catalog, value,
+		DP_AUDIO_SDP_COPYMANAGEMENT, DP_AUDIO_SDP_HEADER_2);
+
+	/* Config header and parity byte 3 */
+	value = dp_audio_get_header(catalog,
+			DP_AUDIO_SDP_COPYMANAGEMENT, DP_AUDIO_SDP_HEADER_3);
+
+	new_value = 0x0;
+	parity_byte = dp_audio_calculate_parity(new_value);
+	value |= ((new_value << HEADER_BYTE_3_BIT)
+			| (parity_byte << PARITY_BYTE_3_BIT));
+	DRM_DEBUG_DP("Header Byte 3: value = 0x%x, parity_byte = 0x%x\n",
+			value, parity_byte);
+	dp_audio_set_header(catalog, value,
+		DP_AUDIO_SDP_COPYMANAGEMENT, DP_AUDIO_SDP_HEADER_3);
+}
+
+static void dp_audio_isrc_sdp(struct dp_audio_private *audio)
+{
+	struct dp_catalog *catalog = audio->catalog;
+	u32 value, new_value;
+	u8 parity_byte;
+
+	/* Config header and parity byte 1 */
+	value = dp_audio_get_header(catalog,
+			DP_AUDIO_SDP_ISRC, DP_AUDIO_SDP_HEADER_1);
+
+	new_value = 0x06;
+	parity_byte = dp_audio_calculate_parity(new_value);
+	value |= ((new_value << HEADER_BYTE_1_BIT)
+			| (parity_byte << PARITY_BYTE_1_BIT));
+	DRM_DEBUG_DP("Header Byte 1: value = 0x%x, parity_byte = 0x%x\n",
+			value, parity_byte);
+	dp_audio_set_header(catalog, value,
+		DP_AUDIO_SDP_ISRC, DP_AUDIO_SDP_HEADER_1);
+
+	/* Config header and parity byte 2 */
+	value = dp_audio_get_header(catalog,
+			DP_AUDIO_SDP_ISRC, DP_AUDIO_SDP_HEADER_2);
+
+	new_value = 0x0F;
+	parity_byte = dp_audio_calculate_parity(new_value);
+	value |= ((new_value << HEADER_BYTE_2_BIT)
+			| (parity_byte << PARITY_BYTE_2_BIT));
+	DRM_DEBUG_DP("Header Byte 2: value = 0x%x, parity_byte = 0x%x\n",
+			value, parity_byte);
+	dp_audio_set_header(catalog, value,
+		DP_AUDIO_SDP_ISRC, DP_AUDIO_SDP_HEADER_2);
+}
+
+static void dp_audio_setup_sdp(struct dp_audio_private *audio)
+{
+	dp_catalog_audio_config_sdp(audio->catalog);
+
+	dp_audio_stream_sdp(audio);
+	dp_audio_timestamp_sdp(audio);
+	dp_audio_infoframe_sdp(audio);
+	dp_audio_copy_management_sdp(audio);
+	dp_audio_isrc_sdp(audio);
+}
+
+static void dp_audio_setup_acr(struct dp_audio_private *audio)
+{
+	u32 select = 0;
+	struct dp_catalog *catalog = audio->catalog;
+
+	switch (audio->dp_audio.bw_code) {
+	case DP_LINK_BW_1_62:
+		select = 0;
+		break;
+	case DP_LINK_BW_2_7:
+		select = 1;
+		break;
+	case DP_LINK_BW_5_4:
+		select = 2;
+		break;
+	case DP_LINK_BW_8_1:
+		select = 3;
+		break;
+	default:
+		DRM_DEBUG_DP("Unknown link rate\n");
+		select = 0;
+		break;
+	}
+
+	catalog->audio_data = select;
+	dp_catalog_audio_config_acr(catalog);
+}
+
+static void dp_audio_safe_to_exit_level(struct dp_audio_private *audio)
+{
+	struct dp_catalog *catalog = audio->catalog;
+	u32 safe_to_exit_level = 0;
+
+	switch (audio->dp_audio.lane_count) {
+	case 1:
+		safe_to_exit_level = 14;
+		break;
+	case 2:
+		safe_to_exit_level = 8;
+		break;
+	case 4:
+		safe_to_exit_level = 5;
+		break;
+	default:
+		DRM_DEBUG_DP("setting the default safe_to_exit_level = %u\n",
+				safe_to_exit_level);
+		safe_to_exit_level = 14;
+		break;
+	}
+
+	catalog->audio_data = safe_to_exit_level;
+	dp_catalog_audio_sfe_level(catalog);
+}
+
+static void dp_audio_enable(struct dp_audio_private *audio, bool enable)
+{
+	struct dp_catalog *catalog = audio->catalog;
+
+	catalog->audio_data = enable;
+	dp_catalog_audio_enable(catalog);
+
+	audio->engine_on = enable;
+}
+
+static struct dp_audio_private *dp_audio_get_data(struct platform_device *pdev)
+{
+	struct dp_audio *dp_audio;
+	struct msm_dp *dp_display;
+
+	if (!pdev) {
+		DRM_ERROR("invalid input\n");
+		return ERR_PTR(-ENODEV);
+	}
+
+	dp_display = platform_get_drvdata(pdev);
+	if (!dp_display) {
+		DRM_ERROR("invalid input\n");
+		return ERR_PTR(-ENODEV);
+	}
+
+	dp_audio = dp_display->dp_audio;
+
+	if (!dp_audio) {
+		DRM_ERROR("invalid dp_audio data\n");
+		return ERR_PTR(-EINVAL);
+	}
+
+	return container_of(dp_audio, struct dp_audio_private, dp_audio);
+}
+
+static int dp_audio_hook_plugged_cb(struct device *dev, void *data,
+		hdmi_codec_plugged_cb fn,
+		struct device *codec_dev)
+{
+
+	struct platform_device *pdev;
+	struct msm_dp *dp_display;
+
+	pdev = to_platform_device(dev);
+	if (!pdev) {
+		pr_err("invalid input\n");
+		return -ENODEV;
+	}
+
+	dp_display = platform_get_drvdata(pdev);
+	if (!dp_display) {
+		pr_err("invalid input\n");
+		return -ENODEV;
+	}
+
+	return dp_display_set_plugged_cb(dp_display, fn, codec_dev);
+}
+
+static int dp_audio_get_eld(struct device *dev,
+	void *data, uint8_t *buf, size_t len)
+{
+	struct platform_device *pdev;
+	struct msm_dp *dp_display;
+
+	pdev = to_platform_device(dev);
+
+	if (!pdev) {
+		DRM_ERROR("invalid input\n");
+		return -ENODEV;
+	}
+
+	dp_display = platform_get_drvdata(pdev);
+	if (!dp_display) {
+		DRM_ERROR("invalid input\n");
+		return -ENODEV;
+	}
+
+	memcpy(buf, dp_display->connector->eld,
+		min(sizeof(dp_display->connector->eld), len));
+
+	return 0;
+}
+
+int dp_audio_hw_params(struct device *dev,
+	void *data,
+	struct hdmi_codec_daifmt *daifmt,
+	struct hdmi_codec_params *params)
+{
+	int rc = 0;
+	struct dp_audio_private *audio;
+	struct platform_device *pdev;
+	struct msm_dp *dp_display;
+
+	pdev = to_platform_device(dev);
+	dp_display = platform_get_drvdata(pdev);
+
+	/*
+	 * there could be cases where sound card can be opened even
+	 * before OR even when DP is not connected . This can cause
+	 * unclocked access as the audio subsystem relies on the DP
+	 * driver to maintain the correct state of clocks. To protect
+	 * such cases check for connection status and bail out if not
+	 * connected.
+	 */
+	if (!dp_display->power_on) {
+		rc = -EINVAL;
+		goto end;
+	}
+
+	audio = dp_audio_get_data(pdev);
+	if (IS_ERR(audio)) {
+		rc = PTR_ERR(audio);
+		goto end;
+	}
+
+	audio->channels = params->channels;
+
+	dp_audio_setup_sdp(audio);
+	dp_audio_setup_acr(audio);
+	dp_audio_safe_to_exit_level(audio);
+	dp_audio_enable(audio, true);
+	dp_display->audio_enabled = true;
+
+end:
+	return rc;
+}
+
+static void dp_audio_shutdown(struct device *dev, void *data)
+{
+	struct dp_audio_private *audio;
+	struct platform_device *pdev;
+	struct msm_dp *dp_display;
+
+	pdev = to_platform_device(dev);
+	dp_display = platform_get_drvdata(pdev);
+	audio = dp_audio_get_data(pdev);
+	if (IS_ERR(audio)) {
+		DRM_ERROR("failed to get audio data\n");
+		return;
+	}
+
+	/*
+	 * if audio was not enabled there is no need
+	 * to execute the shutdown and we can bail out early.
+	 * This also makes sure that we dont cause an unclocked
+	 * access when audio subsystem calls this without DP being
+	 * connected. is_connected cannot be used here as its set
+	 * to false earlier than this call
+	 */
+	if (!dp_display->audio_enabled)
+		return;
+
+	dp_audio_enable(audio, false);
+	/* signal the dp display to safely shutdown clocks */
+	dp_display_signal_audio_complete(dp_display);
+}
+
+static const struct hdmi_codec_ops dp_audio_codec_ops = {
+	.hw_params = dp_audio_hw_params,
+	.audio_shutdown = dp_audio_shutdown,
+	.get_eld = dp_audio_get_eld,
+	.hook_plugged_cb = dp_audio_hook_plugged_cb,
+};
+
+static struct hdmi_codec_pdata codec_data = {
+	.ops = &dp_audio_codec_ops,
+	.max_i2s_channels = 8,
+	.i2s = 1,
+};
+
+int dp_register_audio_driver(struct device *dev,
+		struct dp_audio *dp_audio)
+{
+	struct dp_audio_private *audio_priv;
+
+	audio_priv = container_of(dp_audio,
+			struct dp_audio_private, dp_audio);
+
+	audio_priv->audio_pdev = platform_device_register_data(dev,
+						HDMI_CODEC_DRV_NAME,
+						PLATFORM_DEVID_AUTO,
+						&codec_data,
+						sizeof(codec_data));
+	return PTR_ERR_OR_ZERO(audio_priv->audio_pdev);
+}
+
+struct dp_audio *dp_audio_get(struct platform_device *pdev,
+			struct dp_panel *panel,
+			struct dp_catalog *catalog)
+{
+	int rc = 0;
+	struct dp_audio_private *audio;
+	struct dp_audio *dp_audio;
+
+	if (!pdev || !panel || !catalog) {
+		DRM_ERROR("invalid input\n");
+		rc = -EINVAL;
+		goto error;
+	}
+
+	audio = devm_kzalloc(&pdev->dev, sizeof(*audio), GFP_KERNEL);
+	if (!audio) {
+		rc = -ENOMEM;
+		goto error;
+	}
+
+	audio->pdev = pdev;
+	audio->panel = panel;
+	audio->catalog = catalog;
+
+	dp_audio = &audio->dp_audio;
+
+	dp_catalog_audio_init(catalog);
+
+	return dp_audio;
+error:
+	return ERR_PTR(rc);
+}
+
+void dp_audio_put(struct dp_audio *dp_audio)
+{
+	struct dp_audio_private *audio;
+
+	if (!dp_audio)
+		return;
+
+	audio = container_of(dp_audio, struct dp_audio_private, dp_audio);
+
+	devm_kfree(&audio->pdev->dev, audio);
+}
generated by cgit-pink 1.4.1 (git 2.36.1) at 2024-09-22 17:43:20 +0000