[PATCH v2 0/5] DRM: Bridge: DW_HDMI: Add new features and bug fix

[PATCH v2 0/5] DRM: Bridge: DW_HDMI: Add new features and bug fix

[Sandor Yu]

This is new features and bug fix patch set for DW_HDMI DRM bridge driver
that has verified by NXP i.MX8MPlus.
Three new feature added:
1. Add GPA interface for DW_HDMI Audio.
2. Add CEC PM functions to restore CEC status when device suspend/resume
3. New API for reset PHY Gen1.
Two bugs fixed:
1. Enable overflow workaround for all IP versions later than v1.30a.
2. Clear GCP_Auto bit for 24-bit color depth to pass CTS.

v1->v2:
1. Save CEC interrupt registers in struct dw_hdmi_cec
2. Restore CEC logical address register by cec->addresses.
3. Default enable overflow workaround for all versions later than v1.30a.
4. Add clear_gcp_auto flag to clear gcp_auto bit for all 24-bit color.
5. Remove i.MX8MPlus specific reference.

Sandor Yu (5):
  drm: bridge: dw_hdmi: cec: Add cec suspend/resume function
  drm: bridge: dw_hdmi: default enable workaround to clear the overflow
  drm: bridge: dw_hdmi: Enable GCP only for Deep Color
  drm: bridge: dw_hdmi: add reset function for PHY GEN1
  drm: bridge: dw_hdmi: Audio: Add General Parallel Audio (GPA) driver

 drivers/gpu/drm/bridge/synopsys/Kconfig       |  10 +
 drivers/gpu/drm/bridge/synopsys/Makefile      |   1 +
 drivers/gpu/drm/bridge/synopsys/dw-hdmi-cec.c |  37 ++++
 .../drm/bridge/synopsys/dw-hdmi-gp-audio.c    | 199 ++++++++++++++++++
 drivers/gpu/drm/bridge/synopsys/dw-hdmi.c     | 177 ++++++++++++++--
 drivers/gpu/drm/bridge/synopsys/dw-hdmi.h     |  13 +-
 drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c        |   2 +-
 include/drm/bridge/dw_hdmi.h                  |   9 +-
 8 files changed, 424 insertions(+), 24 deletions(-)
 create mode 100644 drivers/gpu/drm/bridge/synopsys/dw-hdmi-gp-audio.c

-- 
2.25.1

[PATCH v2 1/5] drm: bridge: dw_hdmi: cec: Add cec suspend/resume function

[Sandor Yu]

CEC interrupt status/mask and logical address registers
will be reset when device enter suspend.
It will cause cec fail to work after device resume.
Add CEC suspend/resume functions, reinitialize logical address registers
and restore interrupt status/mask registers after resume.

Signed-off-by: Sandor Yu <Sandor.yu@nxp.com>
---
 drivers/gpu/drm/bridge/synopsys/dw-hdmi-cec.c | 37 +++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-cec.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-cec.c
index c8f44bcb298a..ab176401b727 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-cec.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-cec.c
@@ -62,6 +62,10 @@ struct dw_hdmi_cec {
 	bool rx_done;
 	struct cec_notifier *notify;
 	int irq;
+
+	u8 regs_polarity;
+	u8 regs_mask;
+	u8 regs_mute_stat0;
 };
 
 static void dw_hdmi_write(struct dw_hdmi_cec *cec, u8 val, int offset)
@@ -306,11 +310,44 @@ static int dw_hdmi_cec_remove(struct platform_device *pdev)
 	return 0;
 }
 
+static int __maybe_unused dw_hdmi_cec_resume(struct device *dev)
+{
+	struct dw_hdmi_cec *cec = dev_get_drvdata(dev);
+
+	/* Restore logical address */
+	dw_hdmi_write(cec, cec->addresses & 255, HDMI_CEC_ADDR_L);
+	dw_hdmi_write(cec, cec->addresses >> 8, HDMI_CEC_ADDR_H);
+
+	/* Restore interrupt status/mask register */
+	dw_hdmi_write(cec, cec->regs_polarity, HDMI_CEC_POLARITY);
+	dw_hdmi_write(cec, cec->regs_mask, HDMI_CEC_MASK);
+	dw_hdmi_write(cec, cec->regs_mute_stat0, HDMI_IH_MUTE_CEC_STAT0);
+
+	return 0;
+}
+
+static int __maybe_unused dw_hdmi_cec_suspend(struct device *dev)
+{
+	struct dw_hdmi_cec *cec = dev_get_drvdata(dev);
+
+	/* store interrupt status/mask register */
+	 cec->regs_polarity = dw_hdmi_read(cec, HDMI_CEC_POLARITY);
+	 cec->regs_mask = dw_hdmi_read(cec, HDMI_CEC_MASK);
+	 cec->regs_mute_stat0 = dw_hdmi_read(cec, HDMI_IH_MUTE_CEC_STAT0);
+
+	return 0;
+}
+
+static const struct dev_pm_ops dw_hdmi_cec_pm = {
+	SET_SYSTEM_SLEEP_PM_OPS(dw_hdmi_cec_suspend, dw_hdmi_cec_resume)
+};
+
 static struct platform_driver dw_hdmi_cec_driver = {
 	.probe	= dw_hdmi_cec_probe,
 	.remove	= dw_hdmi_cec_remove,
 	.driver = {
 		.name = "dw-hdmi-cec",
+		.pm = &dw_hdmi_cec_pm,
 	},
 };
 module_platform_driver(dw_hdmi_cec_driver);
-- 
2.25.1

[PATCH v2 2/5] drm: bridge: dw_hdmi: default enable workaround to clear the overflow

[Sandor Yu]

i.MX8MPlus (v2.13a) has verified need the workaround to clear the
overflow with one iteration.
Only i.MX6Q(v1.30a) need the workaround with 4 iterations,
the others versions later than v1.3a have been identified as needing
the workaround with a single iteration.

Default enable the workaround with one iteration for all versions
later than v1.30a.

Signed-off-by: Sandor Yu <Sandor.yu@nxp.com>
---
 drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 23 +++++++----------------
 1 file changed, 7 insertions(+), 16 deletions(-)

diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
index 4befc104d220..02d8f7e08814 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
@@ -2086,30 +2086,21 @@ static void dw_hdmi_clear_overflow(struct dw_hdmi *hdmi)
 	 * then write one of the FC registers several times.
 	 *
 	 * The number of iterations matters and depends on the HDMI TX revision
-	 * (and possibly on the platform). So far i.MX6Q (v1.30a), i.MX6DL
-	 * (v1.31a) and multiple Allwinner SoCs (v1.32a) have been identified
-	 * as needing the workaround, with 4 iterations for v1.30a and 1
-	 * iteration for others.
-	 * The Amlogic Meson GX SoCs (v2.01a) have been identified as needing
-	 * the workaround with a single iteration.
-	 * The Rockchip RK3288 SoC (v2.00a) and RK3328/RK3399 SoCs (v2.11a) have
-	 * been identified as needing the workaround with a single iteration.
+	 * (and possibly on the platform).
+	 * 4 iterations for i.MX6Q(v1.30a) and 1 iteration for others.
+	 * i.MX6DL (v1.31a), Allwinner SoCs (v1.32a), Rockchip RK3288 SoC (v2.00a),
+	 * Amlogic Meson GX SoCs (v2.01a), RK3328/RK3399 SoCs (v2.11a)
+	 * and i.MX8MPlus (v2.13a) have been identified as needing the workaround
+	 * with a single iteration.
 	 */
 
 	switch (hdmi->version) {
 	case 0x130a:
 		count = 4;
 		break;
-	case 0x131a:
-	case 0x132a:
-	case 0x200a:
-	case 0x201a:
-	case 0x211a:
-	case 0x212a:
+	default:
 		count = 1;
 		break;
-	default:
-		return;
 	}
 
 	/* TMDS software reset */
-- 
2.25.1

[PATCH v2 3/5] drm: bridge: dw_hdmi: Enable GCP only for Deep Color

[Sandor Yu]

HDMI1.4b specification section 6.5.3:
Source shall only send GCPs with non-zero CD to sinks
that indicate support for Deep Color.

DW HDMI GCP default enabled, clear gpc_auto bit for 24-bit color depth.

Signed-off-by: Sandor Yu <Sandor.yu@nxp.com>
---
 drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
index 02d8f7e08814..5a7ec066e37a 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
@@ -1108,6 +1108,8 @@ static void hdmi_video_packetize(struct dw_hdmi *hdmi)
 	unsigned int output_select = HDMI_VP_CONF_OUTPUT_SELECTOR_PP;
 	struct hdmi_data_info *hdmi_data = &hdmi->hdmi_data;
 	u8 val, vp_conf;
+	u8 clear_gcp_auto = 0;
+
 
 	if (hdmi_bus_fmt_is_rgb(hdmi->hdmi_data.enc_out_bus_format) ||
 	    hdmi_bus_fmt_is_yuv444(hdmi->hdmi_data.enc_out_bus_format) ||
@@ -1117,6 +1119,7 @@ static void hdmi_video_packetize(struct dw_hdmi *hdmi)
 		case 8:
 			color_depth = 4;
 			output_select = HDMI_VP_CONF_OUTPUT_SELECTOR_BYPASS;
+			clear_gcp_auto = 1;
 			break;
 		case 10:
 			color_depth = 5;
@@ -1136,6 +1139,7 @@ static void hdmi_video_packetize(struct dw_hdmi *hdmi)
 		case 0:
 		case 8:
 			remap_size = HDMI_VP_REMAP_YCC422_16bit;
+			clear_gcp_auto = 1;
 			break;
 		case 10:
 			remap_size = HDMI_VP_REMAP_YCC422_20bit;
@@ -1160,6 +1164,14 @@ static void hdmi_video_packetize(struct dw_hdmi *hdmi)
 		HDMI_VP_PR_CD_DESIRED_PR_FACTOR_MASK);
 	hdmi_writeb(hdmi, val, HDMI_VP_PR_CD);
 
+	val = hdmi_readb(hdmi, HDMI_FC_DATAUTO3);
+	if (clear_gcp_auto == 1)
+		/* disable Auto GCP when 24-bit color */
+		val &= ~0x4;
+	else
+		val |= 0x4;
+	hdmi_writeb(hdmi, val, HDMI_FC_DATAUTO3);
+
 	hdmi_modb(hdmi, HDMI_VP_STUFF_PR_STUFFING_STUFFING_MODE,
 		  HDMI_VP_STUFF_PR_STUFFING_MASK, HDMI_VP_STUFF);
 
-- 
2.25.1

[PATCH v2 4/5] drm: bridge: dw_hdmi: add reset function for PHY GEN1

[Sandor Yu]

PHY reset register(MC_PHYRSTZ) active high reset control for PHY GEN2,
and active low reset control for PHY GEN1.

Rename function dw_hdmi_phy_reset to dw_hdmi_phy_gen2_reset.
Add dw_hdmi_phy_gen1_reset function for PHY GEN1.

Signed-off-by: Sandor Yu <Sandor.yu@nxp.com>
---
 drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 14 +++++++++++---
 drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c    |  2 +-
 include/drm/bridge/dw_hdmi.h              |  4 +++-
 3 files changed, 15 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
index 5a7ec066e37a..13270d96e5be 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
@@ -1369,13 +1369,21 @@ static void dw_hdmi_phy_sel_interface_control(struct dw_hdmi *hdmi, u8 enable)
 			 HDMI_PHY_CONF0_SELDIPIF_MASK);
 }
 
-void dw_hdmi_phy_reset(struct dw_hdmi *hdmi)
+void dw_hdmi_phy_gen1_reset(struct dw_hdmi *hdmi)
+{
+	/* PHY reset. The reset signal is active low on Gen1 PHYs. */
+	hdmi_writeb(hdmi, 0, HDMI_MC_PHYRSTZ);
+	hdmi_writeb(hdmi, HDMI_MC_PHYRSTZ_PHYRSTZ, HDMI_MC_PHYRSTZ);
+}
+EXPORT_SYMBOL_GPL(dw_hdmi_phy_gen1_reset);
+
+void dw_hdmi_phy_gen2_reset(struct dw_hdmi *hdmi)
 {
 	/* PHY reset. The reset signal is active high on Gen2 PHYs. */
 	hdmi_writeb(hdmi, HDMI_MC_PHYRSTZ_PHYRSTZ, HDMI_MC_PHYRSTZ);
 	hdmi_writeb(hdmi, 0, HDMI_MC_PHYRSTZ);
 }
-EXPORT_SYMBOL_GPL(dw_hdmi_phy_reset);
+EXPORT_SYMBOL_GPL(dw_hdmi_phy_gen2_reset);
 
 void dw_hdmi_phy_i2c_set_addr(struct dw_hdmi *hdmi, u8 address)
 {
@@ -1529,7 +1537,7 @@ static int hdmi_phy_configure(struct dw_hdmi *hdmi,
 	if (phy->has_svsret)
 		dw_hdmi_phy_enable_svsret(hdmi, 1);
 
-	dw_hdmi_phy_reset(hdmi);
+	dw_hdmi_phy_gen2_reset(hdmi);
 
 	hdmi_writeb(hdmi, HDMI_MC_HEACPHY_RST_ASSERT, HDMI_MC_HEACPHY_RST);
 
diff --git a/drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c b/drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c
index 5e2b0175df36..2860e6bff8b7 100644
--- a/drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c
+++ b/drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c
@@ -135,7 +135,7 @@ static int sun8i_hdmi_phy_config_a83t(struct dw_hdmi *hdmi,
 	dw_hdmi_phy_gen2_txpwron(hdmi, 0);
 	dw_hdmi_phy_gen2_pddq(hdmi, 1);
 
-	dw_hdmi_phy_reset(hdmi);
+	dw_hdmi_phy_gen2_reset(hdmi);
 
 	dw_hdmi_phy_gen2_pddq(hdmi, 0);
 
diff --git a/include/drm/bridge/dw_hdmi.h b/include/drm/bridge/dw_hdmi.h
index 2a1f85f9a8a3..70082f80a8c8 100644
--- a/include/drm/bridge/dw_hdmi.h
+++ b/include/drm/bridge/dw_hdmi.h
@@ -187,9 +187,11 @@ void dw_hdmi_phy_i2c_set_addr(struct dw_hdmi *hdmi, u8 address);
 void dw_hdmi_phy_i2c_write(struct dw_hdmi *hdmi, unsigned short data,
 			   unsigned char addr);
 
+void dw_hdmi_phy_gen1_reset(struct dw_hdmi *hdmi);
+
 void dw_hdmi_phy_gen2_pddq(struct dw_hdmi *hdmi, u8 enable);
 void dw_hdmi_phy_gen2_txpwron(struct dw_hdmi *hdmi, u8 enable);
-void dw_hdmi_phy_reset(struct dw_hdmi *hdmi);
+void dw_hdmi_phy_gen2_reset(struct dw_hdmi *hdmi);
 
 enum drm_connector_status dw_hdmi_phy_read_hpd(struct dw_hdmi *hdmi,
 					       void *data);
-- 
2.25.1

[PATCH v2 5/5] drm: bridge: dw_hdmi: Audio: Add General Parallel Audio (GPA) driver

[Sandor Yu]

General Parallel Audio (GPA) interface is one of the supported
audio interface for synopsys HDMI module, which has verified for
i.MX8MPlus platform.
This is initial version for GPA.

Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
Signed-off-by: Sandor Yu <Sandor.yu@nxp.com>
---
 drivers/gpu/drm/bridge/synopsys/Kconfig       |  10 +
 drivers/gpu/drm/bridge/synopsys/Makefile      |   1 +
 .../drm/bridge/synopsys/dw-hdmi-gp-audio.c    | 199 ++++++++++++++++++
 drivers/gpu/drm/bridge/synopsys/dw-hdmi.c     | 128 ++++++++++-
 drivers/gpu/drm/bridge/synopsys/dw-hdmi.h     |  13 +-
 include/drm/bridge/dw_hdmi.h                  |   5 +
 6 files changed, 353 insertions(+), 3 deletions(-)
 create mode 100644 drivers/gpu/drm/bridge/synopsys/dw-hdmi-gp-audio.c

diff --git a/drivers/gpu/drm/bridge/synopsys/Kconfig b/drivers/gpu/drm/bridge/synopsys/Kconfig
index 21a1be3ced0f..a4a31b669b65 100644
--- a/drivers/gpu/drm/bridge/synopsys/Kconfig
+++ b/drivers/gpu/drm/bridge/synopsys/Kconfig
@@ -25,6 +25,16 @@ config DRM_DW_HDMI_I2S_AUDIO
 	  Support the I2S Audio interface which is part of the Synopsys
 	  Designware HDMI block.
 
+config DRM_DW_HDMI_GP_AUDIO
+	tristate "Synopsys Designware GP Audio interface"
+	depends on DRM_DW_HDMI && SND
+	select SND_PCM
+	select SND_PCM_ELD
+	select SND_PCM_IEC958
+	help
+	  Support the GP Audio interface which is part of the Synopsys
+	  Designware HDMI block.
+
 config DRM_DW_HDMI_CEC
 	tristate "Synopsis Designware CEC interface"
 	depends on DRM_DW_HDMI
diff --git a/drivers/gpu/drm/bridge/synopsys/Makefile b/drivers/gpu/drm/bridge/synopsys/Makefile
index 91d746ad5de1..ce715562e9e5 100644
--- a/drivers/gpu/drm/bridge/synopsys/Makefile
+++ b/drivers/gpu/drm/bridge/synopsys/Makefile
@@ -1,6 +1,7 @@
 # SPDX-License-Identifier: GPL-2.0-only
 obj-$(CONFIG_DRM_DW_HDMI) += dw-hdmi.o
 obj-$(CONFIG_DRM_DW_HDMI_AHB_AUDIO) += dw-hdmi-ahb-audio.o
+obj-$(CONFIG_DRM_DW_HDMI_GP_AUDIO) += dw-hdmi-gp-audio.o
 obj-$(CONFIG_DRM_DW_HDMI_I2S_AUDIO) += dw-hdmi-i2s-audio.o
 obj-$(CONFIG_DRM_DW_HDMI_CEC) += dw-hdmi-cec.o
 
diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-gp-audio.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-gp-audio.c
new file mode 100644
index 000000000000..10a957c85a83
--- /dev/null
+++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-gp-audio.c
@@ -0,0 +1,199 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * dw-hdmi-gp-audio.c
+ *
+ * Copyright 2020-2022 NXP
+ */
+#include <linux/io.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/dmaengine.h>
+#include <linux/dma-mapping.h>
+#include <drm/bridge/dw_hdmi.h>
+#include <drm/drm_edid.h>
+#include <drm/drm_connector.h>
+
+#include <sound/hdmi-codec.h>
+#include <sound/asoundef.h>
+#include <sound/core.h>
+#include <sound/initval.h>
+#include <sound/pcm.h>
+#include <sound/pcm_drm_eld.h>
+#include <sound/pcm_iec958.h>
+#include <sound/dmaengine_pcm.h>
+
+#include "dw-hdmi-audio.h"
+
+#define DRIVER_NAME "dw-hdmi-gp-audio"
+#define DRV_NAME    "hdmi-gp-audio"
+
+struct snd_dw_hdmi {
+	struct dw_hdmi_audio_data data;
+	struct platform_device  *audio_pdev;
+	unsigned int pos;
+};
+
+struct dw_hdmi_channel_conf {
+	u8 conf1;
+	u8 ca;
+};
+
+/*
+ * The default mapping of ALSA channels to HDMI channels and speaker
+ * allocation bits.  Note that we can't do channel remapping here -
+ * channels must be in the same order.
+ *
+ * Mappings for alsa-lib pcm/surround*.conf files:
+ *
+ *		Front	Sur4.0	Sur4.1	Sur5.0	Sur5.1	Sur7.1
+ * Channels	2	4	6	6	6	8
+ *
+ * Our mapping from ALSA channel to CEA686D speaker name and HDMI channel:
+ *
+ *				Number of ALSA channels
+ * ALSA Channel	2	3	4	5	6	7	8
+ * 0		FL:0	=	=	=	=	=	=
+ * 1		FR:1	=	=	=	=	=	=
+ * 2			FC:3	RL:4	LFE:2	=	=	=
+ * 3				RR:5	RL:4	FC:3	=	=
+ * 4					RR:5	RL:4	=	=
+ * 5						RR:5	=	=
+ * 6							RC:6	=
+ * 7							RLC/FRC	RLC/FRC
+ */
+static struct dw_hdmi_channel_conf default_hdmi_channel_config[7] = {
+	{ 0x03, 0x00 },	/* FL,FR */
+	{ 0x0b, 0x02 },	/* FL,FR,FC */
+	{ 0x33, 0x08 },	/* FL,FR,RL,RR */
+	{ 0x37, 0x09 },	/* FL,FR,LFE,RL,RR */
+	{ 0x3f, 0x0b },	/* FL,FR,LFE,FC,RL,RR */
+	{ 0x7f, 0x0f },	/* FL,FR,LFE,FC,RL,RR,RC */
+	{ 0xff, 0x13 },	/* FL,FR,LFE,FC,RL,RR,[FR]RC,[FR]LC */
+};
+
+static int audio_hw_params(struct device *dev,  void *data,
+			   struct hdmi_codec_daifmt *daifmt,
+			   struct hdmi_codec_params *params)
+{
+	struct snd_dw_hdmi *dw = dev_get_drvdata(dev);
+	int ret = 0;
+	u8 ca;
+
+	dw_hdmi_set_sample_rate(dw->data.hdmi, params->sample_rate);
+
+	ca = default_hdmi_channel_config[params->channels - 2].ca;
+
+	dw_hdmi_set_channel_count(dw->data.hdmi, params->channels);
+	dw_hdmi_set_channel_allocation(dw->data.hdmi, ca);
+
+	dw_hdmi_set_sample_non_pcm(dw->data.hdmi,
+				   params->iec.status[0] & IEC958_AES0_NONAUDIO);
+	dw_hdmi_set_sample_width(dw->data.hdmi, params->sample_width);
+
+	return ret;
+}
+
+static void audio_shutdown(struct device *dev, void *data)
+{
+}
+
+static int audio_mute_stream(struct device *dev, void *data,
+			      bool enable, int direction)
+{
+	struct snd_dw_hdmi *dw = dev_get_drvdata(dev);
+	int ret = 0;
+
+	if (!enable)
+		dw_hdmi_audio_enable(dw->data.hdmi);
+	else
+		dw_hdmi_audio_disable(dw->data.hdmi);
+
+	return ret;
+}
+
+static int audio_get_eld(struct device *dev, void *data,
+			 u8 *buf, size_t len)
+{
+	struct dw_hdmi_audio_data *audio = data;
+	u8 *eld;
+
+	eld = audio->get_eld(audio->hdmi);
+	if (eld)
+		memcpy(buf, eld, min_t(size_t, MAX_ELD_BYTES, len));
+	else
+		/* Pass en empty ELD if connector not available */
+		memset(buf, 0, len);
+
+	return 0;
+}
+
+static int audio_hook_plugged_cb(struct device *dev, void *data,
+				 hdmi_codec_plugged_cb fn,
+				 struct device *codec_dev)
+{
+	struct snd_dw_hdmi *dw = dev_get_drvdata(dev);
+
+	return dw_hdmi_set_plugged_cb(dw->data.hdmi, fn, codec_dev);
+}
+
+static const struct hdmi_codec_ops audio_codec_ops = {
+	.hw_params = audio_hw_params,
+	.audio_shutdown = audio_shutdown,
+	.mute_stream = audio_mute_stream,
+	.get_eld = audio_get_eld,
+	.hook_plugged_cb = audio_hook_plugged_cb,
+};
+
+static int snd_dw_hdmi_probe(struct platform_device *pdev)
+{
+	struct dw_hdmi_audio_data *data = pdev->dev.platform_data;
+	struct snd_dw_hdmi *dw;
+
+	const struct hdmi_codec_pdata codec_data = {
+		.i2s = 1,
+		.spdif = 0,
+		.ops = &audio_codec_ops,
+		.max_i2s_channels = 8,
+		.data = data,
+	};
+
+	dw = devm_kzalloc(&pdev->dev, sizeof(*dw), GFP_KERNEL);
+	if (!dw)
+		return -ENOMEM;
+
+	dw->data = *data;
+
+	platform_set_drvdata(pdev, dw);
+
+	dw->audio_pdev = platform_device_register_data(&pdev->dev,
+						       HDMI_CODEC_DRV_NAME, 1,
+						       &codec_data,
+						       sizeof(codec_data));
+
+	return PTR_ERR_OR_ZERO(dw->audio_pdev);
+}
+
+static int snd_dw_hdmi_remove(struct platform_device *pdev)
+{
+	struct snd_dw_hdmi *dw = platform_get_drvdata(pdev);
+
+	platform_device_unregister(dw->audio_pdev);
+
+	return 0;
+}
+
+static struct platform_driver snd_dw_hdmi_driver = {
+	.probe	= snd_dw_hdmi_probe,
+	.remove	= snd_dw_hdmi_remove,
+	.driver	= {
+		.name = DRIVER_NAME,
+	},
+};
+
+module_platform_driver(snd_dw_hdmi_driver);
+
+MODULE_AUTHOR("Shengjiu Wang <shengjiu.wang@nxp.com>");
+MODULE_DESCRIPTION("Synopsis Designware HDMI GPA ALSA interface");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:" DRIVER_NAME);
diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
index 13270d96e5be..2ebbe9fc5d7f 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
@@ -191,7 +191,10 @@ struct dw_hdmi {
 
 	spinlock_t audio_lock;
 	struct mutex audio_mutex;
+	unsigned int sample_non_pcm;
+	unsigned int sample_width;
 	unsigned int sample_rate;
+	unsigned int channels;
 	unsigned int audio_cts;
 	unsigned int audio_n;
 	bool audio_enable;
@@ -589,6 +592,8 @@ static unsigned int hdmi_compute_n(unsigned int freq, unsigned long pixel_clk)
 			n = 4096;
 		else if (pixel_clk == 74176000 || pixel_clk == 148352000)
 			n = 11648;
+		else if (pixel_clk == 297000000)
+			n = 3072;
 		else
 			n = 4096;
 		n *= mult;
@@ -601,6 +606,8 @@ static unsigned int hdmi_compute_n(unsigned int freq, unsigned long pixel_clk)
 			n = 17836;
 		else if (pixel_clk == 148352000)
 			n = 8918;
+		else if (pixel_clk == 297000000)
+			n = 4704;
 		else
 			n = 6272;
 		n *= mult;
@@ -615,6 +622,8 @@ static unsigned int hdmi_compute_n(unsigned int freq, unsigned long pixel_clk)
 			n = 11648;
 		else if (pixel_clk == 148352000)
 			n = 5824;
+		else if (pixel_clk == 297000000)
+			n = 5120;
 		else
 			n = 6144;
 		n *= mult;
@@ -660,7 +669,7 @@ static void hdmi_set_clk_regenerator(struct dw_hdmi *hdmi,
 	config3 = hdmi_readb(hdmi, HDMI_CONFIG3_ID);
 
 	/* Only compute CTS when using internal AHB audio */
-	if (config3 & HDMI_CONFIG3_AHBAUDDMA) {
+	if ((config3 & HDMI_CONFIG3_AHBAUDDMA) || (config3 & HDMI_CONFIG3_GPAUD)) {
 		/*
 		 * Compute the CTS value from the N value.  Note that CTS and N
 		 * can be up to 20 bits in total, so we need 64-bit math.  Also
@@ -702,6 +711,22 @@ static void hdmi_clk_regenerator_update_pixel_clock(struct dw_hdmi *hdmi)
 	mutex_unlock(&hdmi->audio_mutex);
 }
 
+void dw_hdmi_set_sample_width(struct dw_hdmi *hdmi, unsigned int width)
+{
+	mutex_lock(&hdmi->audio_mutex);
+	hdmi->sample_width = width;
+	mutex_unlock(&hdmi->audio_mutex);
+}
+EXPORT_SYMBOL_GPL(dw_hdmi_set_sample_width);
+
+void dw_hdmi_set_sample_non_pcm(struct dw_hdmi *hdmi, unsigned int non_pcm)
+{
+	mutex_lock(&hdmi->audio_mutex);
+	hdmi->sample_non_pcm = non_pcm;
+	mutex_unlock(&hdmi->audio_mutex);
+}
+EXPORT_SYMBOL_GPL(dw_hdmi_set_sample_non_pcm);
+
 void dw_hdmi_set_sample_rate(struct dw_hdmi *hdmi, unsigned int rate)
 {
 	mutex_lock(&hdmi->audio_mutex);
@@ -717,6 +742,7 @@ void dw_hdmi_set_channel_count(struct dw_hdmi *hdmi, unsigned int cnt)
 	u8 layout;
 
 	mutex_lock(&hdmi->audio_mutex);
+	hdmi->channels = cnt;
 
 	/*
 	 * For >2 channel PCM audio, we need to select layout 1
@@ -765,6 +791,87 @@ static u8 *hdmi_audio_get_eld(struct dw_hdmi *hdmi)
 	return hdmi->curr_conn->eld;
 }
 
+static void dw_hdmi_gp_audio_enable(struct dw_hdmi *hdmi)
+{
+	int sample_freq = 0x2, org_sample_freq = 0xD;
+	int ch_mask = BIT(hdmi->channels) - 1;
+
+	switch (hdmi->sample_rate) {
+	case 32000:
+		sample_freq = 0x03;
+		org_sample_freq = 0x0C;
+		break;
+	case 44100:
+		sample_freq = 0x00;
+		org_sample_freq = 0x0F;
+		break;
+	case 48000:
+		sample_freq = 0x02;
+		org_sample_freq = 0x0D;
+		break;
+	case 88200:
+		sample_freq = 0x08;
+		org_sample_freq = 0x07;
+		break;
+	case 96000:
+		sample_freq = 0x0A;
+		org_sample_freq = 0x05;
+		break;
+	case 176400:
+		sample_freq = 0x0C;
+		org_sample_freq = 0x03;
+		break;
+	case 192000:
+		sample_freq = 0x0E;
+		org_sample_freq = 0x01;
+		break;
+	default:
+		break;
+	}
+
+	hdmi_set_cts_n(hdmi, hdmi->audio_cts, hdmi->audio_n);
+	hdmi_enable_audio_clk(hdmi, true);
+
+	hdmi_writeb(hdmi, 0x1, HDMI_FC_AUDSCHNLS0);
+	hdmi_writeb(hdmi, hdmi->channels, HDMI_FC_AUDSCHNLS2);
+	hdmi_writeb(hdmi, 0x22, HDMI_FC_AUDSCHNLS3);
+	hdmi_writeb(hdmi, 0x22, HDMI_FC_AUDSCHNLS4);
+	hdmi_writeb(hdmi, 0x11, HDMI_FC_AUDSCHNLS5);
+	hdmi_writeb(hdmi, 0x11, HDMI_FC_AUDSCHNLS6);
+	hdmi_writeb(hdmi, (0x3 << 4) | sample_freq, HDMI_FC_AUDSCHNLS7);
+	hdmi_writeb(hdmi, (org_sample_freq << 4) | 0xb, HDMI_FC_AUDSCHNLS8);
+
+	hdmi_writeb(hdmi, ch_mask, HDMI_GP_CONF1);
+	hdmi_writeb(hdmi, 0x02, HDMI_GP_CONF2);
+	hdmi_writeb(hdmi, 0x01, HDMI_GP_CONF0);
+
+	hdmi_modb(hdmi,  0x3, 0x3, HDMI_FC_DATAUTO3);
+
+	/* hbr */
+	if (hdmi->sample_rate == 192000 && hdmi->channels == 8 &&
+	    hdmi->sample_width == 32 && hdmi->sample_non_pcm) {
+		hdmi_modb(hdmi, 0x01, 0x01, HDMI_GP_CONF2);
+	}
+
+	if (hdmi->phy.ops->enable_audio)
+		hdmi->phy.ops->enable_audio(hdmi, hdmi->phy.data,
+					    hdmi->channels,
+					    hdmi->sample_width,
+					    hdmi->sample_rate,
+					    hdmi->sample_non_pcm);
+}
+
+static void dw_hdmi_gp_audio_disable(struct dw_hdmi *hdmi)
+{
+	hdmi_set_cts_n(hdmi, hdmi->audio_cts, 0);
+
+	hdmi_modb(hdmi,  0, 0x3, HDMI_FC_DATAUTO3);
+	if (hdmi->phy.ops->disable_audio)
+		hdmi->phy.ops->disable_audio(hdmi, hdmi->phy.data);
+
+	hdmi_enable_audio_clk(hdmi, false);
+}
+
 static void dw_hdmi_ahb_audio_enable(struct dw_hdmi *hdmi)
 {
 	hdmi_set_cts_n(hdmi, hdmi->audio_cts, hdmi->audio_n);
@@ -3253,6 +3360,7 @@ struct dw_hdmi *dw_hdmi_probe(struct platform_device *pdev,
 	hdmi->plat_data = plat_data;
 	hdmi->dev = dev;
 	hdmi->sample_rate = 48000;
+	hdmi->channels = 2;
 	hdmi->disabled = true;
 	hdmi->rxsense = true;
 	hdmi->phy_mask = (u8)~(HDMI_PHY_HPD | HDMI_PHY_RX_SENSE);
@@ -3476,6 +3584,24 @@ struct dw_hdmi *dw_hdmi_probe(struct platform_device *pdev,
 		pdevinfo.size_data = sizeof(audio);
 		pdevinfo.dma_mask = DMA_BIT_MASK(32);
 		hdmi->audio = platform_device_register_full(&pdevinfo);
+	} else if (iores && config3 & HDMI_CONFIG3_GPAUD) {
+		struct dw_hdmi_audio_data audio;
+
+		audio.phys = iores->start;
+		audio.base = hdmi->regs;
+		audio.irq = irq;
+		audio.hdmi = hdmi;
+		audio.get_eld = hdmi_audio_get_eld;
+
+		hdmi->enable_audio = dw_hdmi_gp_audio_enable;
+		hdmi->disable_audio = dw_hdmi_gp_audio_disable;
+
+		pdevinfo.name = "dw-hdmi-gp-audio";
+		pdevinfo.id = PLATFORM_DEVID_NONE;
+		pdevinfo.data = &audio;
+		pdevinfo.size_data = sizeof(audio);
+		pdevinfo.dma_mask = DMA_BIT_MASK(32);
+		hdmi->audio = platform_device_register_full(&pdevinfo);
 	}
 
 	if (!plat_data->disable_cec && (config0 & HDMI_CONFIG0_CEC)) {
diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.h b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.h
index 1999db05bc3b..99aa1c03343b 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.h
+++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.h
@@ -158,8 +158,17 @@
 #define HDMI_FC_SPDDEVICEINF                    0x1062
 #define HDMI_FC_AUDSCONF                        0x1063
 #define HDMI_FC_AUDSSTAT                        0x1064
-#define HDMI_FC_AUDSCHNLS7                      0x106e
-#define HDMI_FC_AUDSCHNLS8                      0x106f
+#define HDMI_FC_AUDSV                           0x1065
+#define HDMI_FC_AUDSU                           0x1066
+#define HDMI_FC_AUDSCHNLS0                       0x1067
+#define HDMI_FC_AUDSCHNLS1                       0x1068
+#define HDMI_FC_AUDSCHNLS2                       0x1069
+#define HDMI_FC_AUDSCHNLS3                       0x106A
+#define HDMI_FC_AUDSCHNLS4                       0x106B
+#define HDMI_FC_AUDSCHNLS5                       0x106C
+#define HDMI_FC_AUDSCHNLS6                       0x106D
+#define HDMI_FC_AUDSCHNLS7                       0x106E
+#define HDMI_FC_AUDSCHNLS8                       0x106F
 #define HDMI_FC_DATACH0FILL                     0x1070
 #define HDMI_FC_DATACH1FILL                     0x1071
 #define HDMI_FC_DATACH2FILL                     0x1072
diff --git a/include/drm/bridge/dw_hdmi.h b/include/drm/bridge/dw_hdmi.h
index 70082f80a8c8..7f73c3398a54 100644
--- a/include/drm/bridge/dw_hdmi.h
+++ b/include/drm/bridge/dw_hdmi.h
@@ -121,6 +121,9 @@ struct dw_hdmi_phy_ops {
 	void (*update_hpd)(struct dw_hdmi *hdmi, void *data,
 			   bool force, bool disabled, bool rxsense);
 	void (*setup_hpd)(struct dw_hdmi *hdmi, void *data);
+	void (*enable_audio)(struct dw_hdmi *hdmi, void *data, int channel,
+			     int width, int rate, int non_pcm);
+	void (*disable_audio)(struct dw_hdmi *hdmi, void *data);
 };
 
 struct dw_hdmi_plat_data {
@@ -173,6 +176,8 @@ void dw_hdmi_setup_rx_sense(struct dw_hdmi *hdmi, bool hpd, bool rx_sense);
 
 int dw_hdmi_set_plugged_cb(struct dw_hdmi *hdmi, hdmi_codec_plugged_cb fn,
 			   struct device *codec_dev);
+void dw_hdmi_set_sample_non_pcm(struct dw_hdmi *hdmi, unsigned int non_pcm);
+void dw_hdmi_set_sample_width(struct dw_hdmi *hdmi, unsigned int width);
 void dw_hdmi_set_sample_rate(struct dw_hdmi *hdmi, unsigned int rate);
 void dw_hdmi_set_channel_count(struct dw_hdmi *hdmi, unsigned int cnt);
 void dw_hdmi_set_channel_status(struct dw_hdmi *hdmi, u8 *channel_status);
-- 
2.25.1

Re: [PATCH v2 2/5] drm: bridge: dw_hdmi: default enable workaround to clear the overflow

[Neil Armstrong]

On 08/04/2022 12:32, Sandor Yu wrote:
> i.MX8MPlus (v2.13a) has verified need the workaround to clear the
> overflow with one iteration.
> Only i.MX6Q(v1.30a) need the workaround with 4 iterations,
> the others versions later than v1.3a have been identified as needing
> the workaround with a single iteration.
> 
> Default enable the workaround with one iteration for all versions
> later than v1.30a.
> 
> Signed-off-by: Sandor Yu <Sandor.yu@nxp.com>
> ---
>   drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 23 +++++++----------------
>   1 file changed, 7 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> index 4befc104d220..02d8f7e08814 100644
> --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> @@ -2086,30 +2086,21 @@ static void dw_hdmi_clear_overflow(struct dw_hdmi *hdmi)
>   	 * then write one of the FC registers several times.
>   	 *
>   	 * The number of iterations matters and depends on the HDMI TX revision
> -	 * (and possibly on the platform). So far i.MX6Q (v1.30a), i.MX6DL
> -	 * (v1.31a) and multiple Allwinner SoCs (v1.32a) have been identified
> -	 * as needing the workaround, with 4 iterations for v1.30a and 1
> -	 * iteration for others.
> -	 * The Amlogic Meson GX SoCs (v2.01a) have been identified as needing
> -	 * the workaround with a single iteration.
> -	 * The Rockchip RK3288 SoC (v2.00a) and RK3328/RK3399 SoCs (v2.11a) have
> -	 * been identified as needing the workaround with a single iteration.
> +	 * (and possibly on the platform).
> +	 * 4 iterations for i.MX6Q(v1.30a) and 1 iteration for others.
> +	 * i.MX6DL (v1.31a), Allwinner SoCs (v1.32a), Rockchip RK3288 SoC (v2.00a),
> +	 * Amlogic Meson GX SoCs (v2.01a), RK3328/RK3399 SoCs (v2.11a)
> +	 * and i.MX8MPlus (v2.13a) have been identified as needing the workaround
> +	 * with a single iteration.
>   	 */
>   
>   	switch (hdmi->version) {
>   	case 0x130a:
>   		count = 4;
>   		break;
> -	case 0x131a:
> -	case 0x132a:
> -	case 0x200a:
> -	case 0x201a:
> -	case 0x211a:
> -	case 0x212a:
> +	default:
>   		count = 1;
>   		break;
> -	default:
> -		return;
>   	}
>   
>   	/* TMDS software reset */

Acked-by: Neil Armstrong <narmstrong@baylibre.com>

Re: [PATCH v2 4/5] drm: bridge: dw_hdmi: add reset function for PHY GEN1

[Neil Armstrong]

On 08/04/2022 12:32, Sandor Yu wrote:
> PHY reset register(MC_PHYRSTZ) active high reset control for PHY GEN2,
> and active low reset control for PHY GEN1.
> 
> Rename function dw_hdmi_phy_reset to dw_hdmi_phy_gen2_reset.
> Add dw_hdmi_phy_gen1_reset function for PHY GEN1.
> 
> Signed-off-by: Sandor Yu <Sandor.yu@nxp.com>
> ---
>   drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 14 +++++++++++---
>   drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c    |  2 +-
>   include/drm/bridge/dw_hdmi.h              |  4 +++-
>   3 files changed, 15 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> index 5a7ec066e37a..13270d96e5be 100644
> --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> @@ -1369,13 +1369,21 @@ static void dw_hdmi_phy_sel_interface_control(struct dw_hdmi *hdmi, u8 enable)
>   			 HDMI_PHY_CONF0_SELDIPIF_MASK);
>   }
>   
> -void dw_hdmi_phy_reset(struct dw_hdmi *hdmi)
> +void dw_hdmi_phy_gen1_reset(struct dw_hdmi *hdmi)
> +{
> +	/* PHY reset. The reset signal is active low on Gen1 PHYs. */
> +	hdmi_writeb(hdmi, 0, HDMI_MC_PHYRSTZ);
> +	hdmi_writeb(hdmi, HDMI_MC_PHYRSTZ_PHYRSTZ, HDMI_MC_PHYRSTZ);
> +}
> +EXPORT_SYMBOL_GPL(dw_hdmi_phy_gen1_reset);
> +
> +void dw_hdmi_phy_gen2_reset(struct dw_hdmi *hdmi)
>   {
>   	/* PHY reset. The reset signal is active high on Gen2 PHYs. */
>   	hdmi_writeb(hdmi, HDMI_MC_PHYRSTZ_PHYRSTZ, HDMI_MC_PHYRSTZ);
>   	hdmi_writeb(hdmi, 0, HDMI_MC_PHYRSTZ);
>   }
> -EXPORT_SYMBOL_GPL(dw_hdmi_phy_reset);
> +EXPORT_SYMBOL_GPL(dw_hdmi_phy_gen2_reset);
>   
>   void dw_hdmi_phy_i2c_set_addr(struct dw_hdmi *hdmi, u8 address)
>   {
> @@ -1529,7 +1537,7 @@ static int hdmi_phy_configure(struct dw_hdmi *hdmi,
>   	if (phy->has_svsret)
>   		dw_hdmi_phy_enable_svsret(hdmi, 1);
>   
> -	dw_hdmi_phy_reset(hdmi);
> +	dw_hdmi_phy_gen2_reset(hdmi);
>   
>   	hdmi_writeb(hdmi, HDMI_MC_HEACPHY_RST_ASSERT, HDMI_MC_HEACPHY_RST);
>   
> diff --git a/drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c b/drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c
> index 5e2b0175df36..2860e6bff8b7 100644
> --- a/drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c
> +++ b/drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c
> @@ -135,7 +135,7 @@ static int sun8i_hdmi_phy_config_a83t(struct dw_hdmi *hdmi,
>   	dw_hdmi_phy_gen2_txpwron(hdmi, 0);
>   	dw_hdmi_phy_gen2_pddq(hdmi, 1);
>   
> -	dw_hdmi_phy_reset(hdmi);
> +	dw_hdmi_phy_gen2_reset(hdmi);
>   
>   	dw_hdmi_phy_gen2_pddq(hdmi, 0);
>   
> diff --git a/include/drm/bridge/dw_hdmi.h b/include/drm/bridge/dw_hdmi.h
> index 2a1f85f9a8a3..70082f80a8c8 100644
> --- a/include/drm/bridge/dw_hdmi.h
> +++ b/include/drm/bridge/dw_hdmi.h
> @@ -187,9 +187,11 @@ void dw_hdmi_phy_i2c_set_addr(struct dw_hdmi *hdmi, u8 address);
>   void dw_hdmi_phy_i2c_write(struct dw_hdmi *hdmi, unsigned short data,
>   			   unsigned char addr);
>   
> +void dw_hdmi_phy_gen1_reset(struct dw_hdmi *hdmi);
> +
>   void dw_hdmi_phy_gen2_pddq(struct dw_hdmi *hdmi, u8 enable);
>   void dw_hdmi_phy_gen2_txpwron(struct dw_hdmi *hdmi, u8 enable);
> -void dw_hdmi_phy_reset(struct dw_hdmi *hdmi);
> +void dw_hdmi_phy_gen2_reset(struct dw_hdmi *hdmi);
>   
>   enum drm_connector_status dw_hdmi_phy_read_hpd(struct dw_hdmi *hdmi,
>   					       void *data);

Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>

If a sun4i drm maintainer can ack, then it would be all good to apply.

Neil

Re: [PATCH v2 3/5] drm: bridge: dw_hdmi: Enable GCP only for Deep Color

[Neil Armstrong]

On 08/04/2022 12:32, Sandor Yu wrote:
> HDMI1.4b specification section 6.5.3:
> Source shall only send GCPs with non-zero CD to sinks
> that indicate support for Deep Color.
> 
> DW HDMI GCP default enabled, clear gpc_auto bit for 24-bit color depth.

It's right because we do not handle AVMUTE, Pixel Packing nor Default_Phase.

> 
> Signed-off-by: Sandor Yu <Sandor.yu@nxp.com>
> ---
>   drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 12 ++++++++++++
>   1 file changed, 12 insertions(+)
> 
> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> index 02d8f7e08814..5a7ec066e37a 100644
> --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> @@ -1108,6 +1108,8 @@ static void hdmi_video_packetize(struct dw_hdmi *hdmi)
>   	unsigned int output_select = HDMI_VP_CONF_OUTPUT_SELECTOR_PP;
>   	struct hdmi_data_info *hdmi_data = &hdmi->hdmi_data;
>   	u8 val, vp_conf;
> +	u8 clear_gcp_auto = 0;
> +
>   
>   	if (hdmi_bus_fmt_is_rgb(hdmi->hdmi_data.enc_out_bus_format) ||
>   	    hdmi_bus_fmt_is_yuv444(hdmi->hdmi_data.enc_out_bus_format) ||
> @@ -1117,6 +1119,7 @@ static void hdmi_video_packetize(struct dw_hdmi *hdmi)
>   		case 8:
>   			color_depth = 4;
>   			output_select = HDMI_VP_CONF_OUTPUT_SELECTOR_BYPASS;
> +			clear_gcp_auto = 1;
>   			break;
>   		case 10:
>   			color_depth = 5;
> @@ -1136,6 +1139,7 @@ static void hdmi_video_packetize(struct dw_hdmi *hdmi)
>   		case 0:
>   		case 8:
>   			remap_size = HDMI_VP_REMAP_YCC422_16bit;
> +			clear_gcp_auto = 1;
>   			break;
>   		case 10:
>   			remap_size = HDMI_VP_REMAP_YCC422_20bit;
> @@ -1160,6 +1164,14 @@ static void hdmi_video_packetize(struct dw_hdmi *hdmi)
>   		HDMI_VP_PR_CD_DESIRED_PR_FACTOR_MASK);
>   	hdmi_writeb(hdmi, val, HDMI_VP_PR_CD);
>   
> +	val = hdmi_readb(hdmi, HDMI_FC_DATAUTO3);
> +	if (clear_gcp_auto == 1)
> +		/* disable Auto GCP when 24-bit color */

Maybe add a new define for HDMI_FC_DATAUTO3_GCP_AUTO bit and use it here.

> +		val &= ~0x4;
> +	else
> +		val |= 0x4;
> +	hdmi_writeb(hdmi, val, HDMI_FC_DATAUTO3);

Please also add a comment explaining we clear GCP because we only
transmit CD and do not handle AVMUTE, PP nor Default_Phase (yet).

> +
>   	hdmi_modb(hdmi, HDMI_VP_STUFF_PR_STUFFING_STUFFING_MODE,
>   		  HDMI_VP_STUFF_PR_STUFFING_MASK, HDMI_VP_STUFF);
>   

Thanks,
Neil

Re: [PATCH v2 5/5] drm: bridge: dw_hdmi: Audio: Add General Parallel Audio (GPA) driver

[Neil Armstrong]

On 08/04/2022 12:32, Sandor Yu wrote:
> General Parallel Audio (GPA) interface is one of the supported
> audio interface for synopsys HDMI module, which has verified for
> i.MX8MPlus platform.
> This is initial version for GPA.
> 
> Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
> Signed-off-by: Sandor Yu <Sandor.yu@nxp.com>
> ---
>   drivers/gpu/drm/bridge/synopsys/Kconfig       |  10 +
>   drivers/gpu/drm/bridge/synopsys/Makefile      |   1 +
>   .../drm/bridge/synopsys/dw-hdmi-gp-audio.c    | 199 ++++++++++++++++++
>   drivers/gpu/drm/bridge/synopsys/dw-hdmi.c     | 128 ++++++++++-
>   drivers/gpu/drm/bridge/synopsys/dw-hdmi.h     |  13 +-
>   include/drm/bridge/dw_hdmi.h                  |   5 +
>   6 files changed, 353 insertions(+), 3 deletions(-)
>   create mode 100644 drivers/gpu/drm/bridge/synopsys/dw-hdmi-gp-audio.c
> 
> diff --git a/drivers/gpu/drm/bridge/synopsys/Kconfig b/drivers/gpu/drm/bridge/synopsys/Kconfig
> index 21a1be3ced0f..a4a31b669b65 100644
> --- a/drivers/gpu/drm/bridge/synopsys/Kconfig
> +++ b/drivers/gpu/drm/bridge/synopsys/Kconfig
> @@ -25,6 +25,16 @@ config DRM_DW_HDMI_I2S_AUDIO
>   	  Support the I2S Audio interface which is part of the Synopsys
>   	  Designware HDMI block.
>   
> +config DRM_DW_HDMI_GP_AUDIO
> +	tristate "Synopsys Designware GP Audio interface"
> +	depends on DRM_DW_HDMI && SND
> +	select SND_PCM
> +	select SND_PCM_ELD
> +	select SND_PCM_IEC958
> +	help
> +	  Support the GP Audio interface which is part of the Synopsys
> +	  Designware HDMI block.
> +
>   config DRM_DW_HDMI_CEC
>   	tristate "Synopsis Designware CEC interface"
>   	depends on DRM_DW_HDMI
> diff --git a/drivers/gpu/drm/bridge/synopsys/Makefile b/drivers/gpu/drm/bridge/synopsys/Makefile
> index 91d746ad5de1..ce715562e9e5 100644
> --- a/drivers/gpu/drm/bridge/synopsys/Makefile
> +++ b/drivers/gpu/drm/bridge/synopsys/Makefile
> @@ -1,6 +1,7 @@
>   # SPDX-License-Identifier: GPL-2.0-only
>   obj-$(CONFIG_DRM_DW_HDMI) += dw-hdmi.o
>   obj-$(CONFIG_DRM_DW_HDMI_AHB_AUDIO) += dw-hdmi-ahb-audio.o
> +obj-$(CONFIG_DRM_DW_HDMI_GP_AUDIO) += dw-hdmi-gp-audio.o
>   obj-$(CONFIG_DRM_DW_HDMI_I2S_AUDIO) += dw-hdmi-i2s-audio.o
>   obj-$(CONFIG_DRM_DW_HDMI_CEC) += dw-hdmi-cec.o
>   
> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-gp-audio.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-gp-audio.c
> new file mode 100644
> index 000000000000..10a957c85a83
> --- /dev/null
> +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-gp-audio.c
> @@ -0,0 +1,199 @@
> +// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
> +/*
> + * dw-hdmi-gp-audio.c
> + *
> + * Copyright 2020-2022 NXP
> + */
> +#include <linux/io.h>
> +#include <linux/interrupt.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/dmaengine.h>
> +#include <linux/dma-mapping.h>
> +#include <drm/bridge/dw_hdmi.h>
> +#include <drm/drm_edid.h>
> +#include <drm/drm_connector.h>
> +
> +#include <sound/hdmi-codec.h>
> +#include <sound/asoundef.h>
> +#include <sound/core.h>
> +#include <sound/initval.h>
> +#include <sound/pcm.h>
> +#include <sound/pcm_drm_eld.h>
> +#include <sound/pcm_iec958.h>
> +#include <sound/dmaengine_pcm.h>
> +
> +#include "dw-hdmi-audio.h"
> +
> +#define DRIVER_NAME "dw-hdmi-gp-audio"
> +#define DRV_NAME    "hdmi-gp-audio"
> +
> +struct snd_dw_hdmi {
> +	struct dw_hdmi_audio_data data;
> +	struct platform_device  *audio_pdev;
> +	unsigned int pos;
> +};
> +
> +struct dw_hdmi_channel_conf {
> +	u8 conf1;
> +	u8 ca;
> +};
> +
> +/*
> + * The default mapping of ALSA channels to HDMI channels and speaker
> + * allocation bits.  Note that we can't do channel remapping here -
> + * channels must be in the same order.
> + *
> + * Mappings for alsa-lib pcm/surround*.conf files:
> + *
> + *		Front	Sur4.0	Sur4.1	Sur5.0	Sur5.1	Sur7.1
> + * Channels	2	4	6	6	6	8
> + *
> + * Our mapping from ALSA channel to CEA686D speaker name and HDMI channel:
> + *
> + *				Number of ALSA channels
> + * ALSA Channel	2	3	4	5	6	7	8
> + * 0		FL:0	=	=	=	=	=	=
> + * 1		FR:1	=	=	=	=	=	=
> + * 2			FC:3	RL:4	LFE:2	=	=	=
> + * 3				RR:5	RL:4	FC:3	=	=
> + * 4					RR:5	RL:4	=	=
> + * 5						RR:5	=	=
> + * 6							RC:6	=
> + * 7							RLC/FRC	RLC/FRC
> + */
> +static struct dw_hdmi_channel_conf default_hdmi_channel_config[7] = {
> +	{ 0x03, 0x00 },	/* FL,FR */
> +	{ 0x0b, 0x02 },	/* FL,FR,FC */
> +	{ 0x33, 0x08 },	/* FL,FR,RL,RR */
> +	{ 0x37, 0x09 },	/* FL,FR,LFE,RL,RR */
> +	{ 0x3f, 0x0b },	/* FL,FR,LFE,FC,RL,RR */
> +	{ 0x7f, 0x0f },	/* FL,FR,LFE,FC,RL,RR,RC */
> +	{ 0xff, 0x13 },	/* FL,FR,LFE,FC,RL,RR,[FR]RC,[FR]LC */
> +};
> +
> +static int audio_hw_params(struct device *dev,  void *data,
> +			   struct hdmi_codec_daifmt *daifmt,
> +			   struct hdmi_codec_params *params)
> +{
> +	struct snd_dw_hdmi *dw = dev_get_drvdata(dev);
> +	int ret = 0;
> +	u8 ca;
> +
> +	dw_hdmi_set_sample_rate(dw->data.hdmi, params->sample_rate);
> +
> +	ca = default_hdmi_channel_config[params->channels - 2].ca;
> +
> +	dw_hdmi_set_channel_count(dw->data.hdmi, params->channels);
> +	dw_hdmi_set_channel_allocation(dw->data.hdmi, ca);
> +
> +	dw_hdmi_set_sample_non_pcm(dw->data.hdmi,
> +				   params->iec.status[0] & IEC958_AES0_NONAUDIO);
> +	dw_hdmi_set_sample_width(dw->data.hdmi, params->sample_width);
> +
> +	return ret;
> +}
> +
> +static void audio_shutdown(struct device *dev, void *data)
> +{
> +}
> +
> +static int audio_mute_stream(struct device *dev, void *data,
> +			      bool enable, int direction)
> +{
> +	struct snd_dw_hdmi *dw = dev_get_drvdata(dev);
> +	int ret = 0;
> +
> +	if (!enable)
> +		dw_hdmi_audio_enable(dw->data.hdmi);
> +	else
> +		dw_hdmi_audio_disable(dw->data.hdmi);
> +
> +	return ret;
> +}
> +
> +static int audio_get_eld(struct device *dev, void *data,
> +			 u8 *buf, size_t len)
> +{
> +	struct dw_hdmi_audio_data *audio = data;
> +	u8 *eld;
> +
> +	eld = audio->get_eld(audio->hdmi);
> +	if (eld)
> +		memcpy(buf, eld, min_t(size_t, MAX_ELD_BYTES, len));
> +	else
> +		/* Pass en empty ELD if connector not available */
> +		memset(buf, 0, len);
> +
> +	return 0;
> +}
> +
> +static int audio_hook_plugged_cb(struct device *dev, void *data,
> +				 hdmi_codec_plugged_cb fn,
> +				 struct device *codec_dev)
> +{
> +	struct snd_dw_hdmi *dw = dev_get_drvdata(dev);
> +
> +	return dw_hdmi_set_plugged_cb(dw->data.hdmi, fn, codec_dev);
> +}
> +
> +static const struct hdmi_codec_ops audio_codec_ops = {
> +	.hw_params = audio_hw_params,
> +	.audio_shutdown = audio_shutdown,
> +	.mute_stream = audio_mute_stream,
> +	.get_eld = audio_get_eld,
> +	.hook_plugged_cb = audio_hook_plugged_cb,
> +};
> +
> +static int snd_dw_hdmi_probe(struct platform_device *pdev)
> +{
> +	struct dw_hdmi_audio_data *data = pdev->dev.platform_data;
> +	struct snd_dw_hdmi *dw;
> +
> +	const struct hdmi_codec_pdata codec_data = {
> +		.i2s = 1,
> +		.spdif = 0,
> +		.ops = &audio_codec_ops,
> +		.max_i2s_channels = 8,
> +		.data = data,
> +	};
> +
> +	dw = devm_kzalloc(&pdev->dev, sizeof(*dw), GFP_KERNEL);
> +	if (!dw)
> +		return -ENOMEM;
> +
> +	dw->data = *data;
> +
> +	platform_set_drvdata(pdev, dw);
> +
> +	dw->audio_pdev = platform_device_register_data(&pdev->dev,
> +						       HDMI_CODEC_DRV_NAME, 1,
> +						       &codec_data,
> +						       sizeof(codec_data));
> +
> +	return PTR_ERR_OR_ZERO(dw->audio_pdev);
> +}
> +
> +static int snd_dw_hdmi_remove(struct platform_device *pdev)
> +{
> +	struct snd_dw_hdmi *dw = platform_get_drvdata(pdev);
> +
> +	platform_device_unregister(dw->audio_pdev);
> +
> +	return 0;
> +}
> +
> +static struct platform_driver snd_dw_hdmi_driver = {
> +	.probe	= snd_dw_hdmi_probe,
> +	.remove	= snd_dw_hdmi_remove,
> +	.driver	= {
> +		.name = DRIVER_NAME,
> +	},
> +};
> +
> +module_platform_driver(snd_dw_hdmi_driver);
> +
> +MODULE_AUTHOR("Shengjiu Wang <shengjiu.wang@nxp.com>");
> +MODULE_DESCRIPTION("Synopsis Designware HDMI GPA ALSA interface");

Should be Synopsys

> +MODULE_LICENSE("GPL");
> +MODULE_ALIAS("platform:" DRIVER_NAME);
> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> index 13270d96e5be..2ebbe9fc5d7f 100644
> --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> @@ -191,7 +191,10 @@ struct dw_hdmi {
>   
>   	spinlock_t audio_lock;
>   	struct mutex audio_mutex;
> +	unsigned int sample_non_pcm;
> +	unsigned int sample_width;
>   	unsigned int sample_rate;
> +	unsigned int channels;
>   	unsigned int audio_cts;
>   	unsigned int audio_n;
>   	bool audio_enable;
> @@ -589,6 +592,8 @@ static unsigned int hdmi_compute_n(unsigned int freq, unsigned long pixel_clk)
>   			n = 4096;
>   		else if (pixel_clk == 74176000 || pixel_clk == 148352000)
>   			n = 11648;
> +		else if (pixel_clk == 297000000)
> +			n = 3072;
>   		else
>   			n = 4096;
>   		n *= mult;
> @@ -601,6 +606,8 @@ static unsigned int hdmi_compute_n(unsigned int freq, unsigned long pixel_clk)
>   			n = 17836;
>   		else if (pixel_clk == 148352000)
>   			n = 8918;
> +		else if (pixel_clk == 297000000)
> +			n = 4704;
>   		else
>   			n = 6272;
>   		n *= mult;
> @@ -615,6 +622,8 @@ static unsigned int hdmi_compute_n(unsigned int freq, unsigned long pixel_clk)
>   			n = 11648;
>   		else if (pixel_clk == 148352000)
>   			n = 5824;
> +		else if (pixel_clk == 297000000)
> +			n = 5120;
>   		else
>   			n = 6144;
>   		n *= mult;
> @@ -660,7 +669,7 @@ static void hdmi_set_clk_regenerator(struct dw_hdmi *hdmi,
>   	config3 = hdmi_readb(hdmi, HDMI_CONFIG3_ID);
>   
>   	/* Only compute CTS when using internal AHB audio */

Please update the comment to include GPAUD as I requested on V1.

> -	if (config3 & HDMI_CONFIG3_AHBAUDDMA) {
> +	if ((config3 & HDMI_CONFIG3_AHBAUDDMA) || (config3 & HDMI_CONFIG3_GPAUD)) {
>   		/*
>   		 * Compute the CTS value from the N value.  Note that CTS and N
>   		 * can be up to 20 bits in total, so we need 64-bit math.  Also
> @@ -702,6 +711,22 @@ static void hdmi_clk_regenerator_update_pixel_clock(struct dw_hdmi *hdmi)
>   	mutex_unlock(&hdmi->audio_mutex);
>   }
>   
> +void dw_hdmi_set_sample_width(struct dw_hdmi *hdmi, unsigned int width)
> +{
> +	mutex_lock(&hdmi->audio_mutex);
> +	hdmi->sample_width = width;
> +	mutex_unlock(&hdmi->audio_mutex);
> +}
> +EXPORT_SYMBOL_GPL(dw_hdmi_set_sample_width);
> +
> +void dw_hdmi_set_sample_non_pcm(struct dw_hdmi *hdmi, unsigned int non_pcm)
> +{
> +	mutex_lock(&hdmi->audio_mutex);
> +	hdmi->sample_non_pcm = non_pcm;
> +	mutex_unlock(&hdmi->audio_mutex);
> +}
> +EXPORT_SYMBOL_GPL(dw_hdmi_set_sample_non_pcm);
> +
>   void dw_hdmi_set_sample_rate(struct dw_hdmi *hdmi, unsigned int rate)
>   {
>   	mutex_lock(&hdmi->audio_mutex);
> @@ -717,6 +742,7 @@ void dw_hdmi_set_channel_count(struct dw_hdmi *hdmi, unsigned int cnt)
>   	u8 layout;
>   
>   	mutex_lock(&hdmi->audio_mutex);
> +	hdmi->channels = cnt;
>   
>   	/*
>   	 * For >2 channel PCM audio, we need to select layout 1
> @@ -765,6 +791,87 @@ static u8 *hdmi_audio_get_eld(struct dw_hdmi *hdmi)
>   	return hdmi->curr_conn->eld;
>   }
>   
> +static void dw_hdmi_gp_audio_enable(struct dw_hdmi *hdmi)
> +{
> +	int sample_freq = 0x2, org_sample_freq = 0xD;
> +	int ch_mask = BIT(hdmi->channels) - 1;
> +
> +	switch (hdmi->sample_rate) {
> +	case 32000:
> +		sample_freq = 0x03;
> +		org_sample_freq = 0x0C;
> +		break;
> +	case 44100:
> +		sample_freq = 0x00;
> +		org_sample_freq = 0x0F;
> +		break;
> +	case 48000:
> +		sample_freq = 0x02;
> +		org_sample_freq = 0x0D;
> +		break;
> +	case 88200:
> +		sample_freq = 0x08;
> +		org_sample_freq = 0x07;
> +		break;
> +	case 96000:
> +		sample_freq = 0x0A;
> +		org_sample_freq = 0x05;
> +		break;
> +	case 176400:
> +		sample_freq = 0x0C;
> +		org_sample_freq = 0x03;
> +		break;
> +	case 192000:
> +		sample_freq = 0x0E;
> +		org_sample_freq = 0x01;
> +		break;
> +	default:
> +		break;
> +	}
> +
> +	hdmi_set_cts_n(hdmi, hdmi->audio_cts, hdmi->audio_n);
> +	hdmi_enable_audio_clk(hdmi, true);
> +
> +	hdmi_writeb(hdmi, 0x1, HDMI_FC_AUDSCHNLS0);
> +	hdmi_writeb(hdmi, hdmi->channels, HDMI_FC_AUDSCHNLS2);
> +	hdmi_writeb(hdmi, 0x22, HDMI_FC_AUDSCHNLS3);
> +	hdmi_writeb(hdmi, 0x22, HDMI_FC_AUDSCHNLS4);
> +	hdmi_writeb(hdmi, 0x11, HDMI_FC_AUDSCHNLS5);
> +	hdmi_writeb(hdmi, 0x11, HDMI_FC_AUDSCHNLS6);
> +	hdmi_writeb(hdmi, (0x3 << 4) | sample_freq, HDMI_FC_AUDSCHNLS7);
> +	hdmi_writeb(hdmi, (org_sample_freq << 4) | 0xb, HDMI_FC_AUDSCHNLS8);
> +
> +	hdmi_writeb(hdmi, ch_mask, HDMI_GP_CONF1);
> +	hdmi_writeb(hdmi, 0x02, HDMI_GP_CONF2);
> +	hdmi_writeb(hdmi, 0x01, HDMI_GP_CONF0);
> +
> +	hdmi_modb(hdmi,  0x3, 0x3, HDMI_FC_DATAUTO3);
> +
> +	/* hbr */
> +	if (hdmi->sample_rate == 192000 && hdmi->channels == 8 &&
> +	    hdmi->sample_width == 32 && hdmi->sample_non_pcm) {
> +		hdmi_modb(hdmi, 0x01, 0x01, HDMI_GP_CONF2);
> +	}

You can drop the brackets here

> +
> +	if (hdmi->phy.ops->enable_audio)
> +		hdmi->phy.ops->enable_audio(hdmi, hdmi->phy.data,
> +					    hdmi->channels,
> +					    hdmi->sample_width,
> +					    hdmi->sample_rate,
> +					    hdmi->sample_non_pcm);

Are this really PHY ops ? or glue ops ? it looks like it's the later.

Those should eventually go in dw_hdmi_plat_data.

Can you elaborate what is done in those callbacks ? can't you use alsa codecs events instead ?

> +}
> +
> +static void dw_hdmi_gp_audio_disable(struct dw_hdmi *hdmi)
> +{
> +	hdmi_set_cts_n(hdmi, hdmi->audio_cts, 0);
> +
> +	hdmi_modb(hdmi,  0, 0x3, HDMI_FC_DATAUTO3);
> +	if (hdmi->phy.ops->disable_audio)
> +		hdmi->phy.ops->disable_audio(hdmi, hdmi->phy.data);
> +
> +	hdmi_enable_audio_clk(hdmi, false);
> +}
> +
>   static void dw_hdmi_ahb_audio_enable(struct dw_hdmi *hdmi)
>   {
>   	hdmi_set_cts_n(hdmi, hdmi->audio_cts, hdmi->audio_n);
> @@ -3253,6 +3360,7 @@ struct dw_hdmi *dw_hdmi_probe(struct platform_device *pdev,
>   	hdmi->plat_data = plat_data;
>   	hdmi->dev = dev;
>   	hdmi->sample_rate = 48000;
> +	hdmi->channels = 2;
>   	hdmi->disabled = true;
>   	hdmi->rxsense = true;
>   	hdmi->phy_mask = (u8)~(HDMI_PHY_HPD | HDMI_PHY_RX_SENSE);
> @@ -3476,6 +3584,24 @@ struct dw_hdmi *dw_hdmi_probe(struct platform_device *pdev,
>   		pdevinfo.size_data = sizeof(audio);
>   		pdevinfo.dma_mask = DMA_BIT_MASK(32);
>   		hdmi->audio = platform_device_register_full(&pdevinfo);
> +	} else if (iores && config3 & HDMI_CONFIG3_GPAUD) {
> +		struct dw_hdmi_audio_data audio;
> +
> +		audio.phys = iores->start;
> +		audio.base = hdmi->regs;
> +		audio.irq = irq;
> +		audio.hdmi = hdmi;
> +		audio.get_eld = hdmi_audio_get_eld;
> +
> +		hdmi->enable_audio = dw_hdmi_gp_audio_enable;
> +		hdmi->disable_audio = dw_hdmi_gp_audio_disable;
> +
> +		pdevinfo.name = "dw-hdmi-gp-audio";
> +		pdevinfo.id = PLATFORM_DEVID_NONE;
> +		pdevinfo.data = &audio;
> +		pdevinfo.size_data = sizeof(audio);
> +		pdevinfo.dma_mask = DMA_BIT_MASK(32);
> +		hdmi->audio = platform_device_register_full(&pdevinfo);
>   	}
>   
>   	if (!plat_data->disable_cec && (config0 & HDMI_CONFIG0_CEC)) {
> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.h b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.h
> index 1999db05bc3b..99aa1c03343b 100644
> --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.h
> +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.h
> @@ -158,8 +158,17 @@
>   #define HDMI_FC_SPDDEVICEINF                    0x1062
>   #define HDMI_FC_AUDSCONF                        0x1063
>   #define HDMI_FC_AUDSSTAT                        0x1064
> -#define HDMI_FC_AUDSCHNLS7                      0x106e
> -#define HDMI_FC_AUDSCHNLS8                      0x106f
> +#define HDMI_FC_AUDSV                           0x1065
> +#define HDMI_FC_AUDSU                           0x1066
> +#define HDMI_FC_AUDSCHNLS0                       0x1067
> +#define HDMI_FC_AUDSCHNLS1                       0x1068
> +#define HDMI_FC_AUDSCHNLS2                       0x1069
> +#define HDMI_FC_AUDSCHNLS3                       0x106A
> +#define HDMI_FC_AUDSCHNLS4                       0x106B
> +#define HDMI_FC_AUDSCHNLS5                       0x106C
> +#define HDMI_FC_AUDSCHNLS6                       0x106D
> +#define HDMI_FC_AUDSCHNLS7                       0x106E
> +#define HDMI_FC_AUDSCHNLS8                       0x106F
>   #define HDMI_FC_DATACH0FILL                     0x1070
>   #define HDMI_FC_DATACH1FILL                     0x1071
>   #define HDMI_FC_DATACH2FILL                     0x1072
> diff --git a/include/drm/bridge/dw_hdmi.h b/include/drm/bridge/dw_hdmi.h
> index 70082f80a8c8..7f73c3398a54 100644
> --- a/include/drm/bridge/dw_hdmi.h
> +++ b/include/drm/bridge/dw_hdmi.h
> @@ -121,6 +121,9 @@ struct dw_hdmi_phy_ops {
>   	void (*update_hpd)(struct dw_hdmi *hdmi, void *data,
>   			   bool force, bool disabled, bool rxsense);
>   	void (*setup_hpd)(struct dw_hdmi *hdmi, void *data);
> +	void (*enable_audio)(struct dw_hdmi *hdmi, void *data, int channel,
> +			     int width, int rate, int non_pcm);
> +	void (*disable_audio)(struct dw_hdmi *hdmi, void *data);
>   };
>   
>   struct dw_hdmi_plat_data {
> @@ -173,6 +176,8 @@ void dw_hdmi_setup_rx_sense(struct dw_hdmi *hdmi, bool hpd, bool rx_sense);
>   
>   int dw_hdmi_set_plugged_cb(struct dw_hdmi *hdmi, hdmi_codec_plugged_cb fn,
>   			   struct device *codec_dev);
> +void dw_hdmi_set_sample_non_pcm(struct dw_hdmi *hdmi, unsigned int non_pcm);
> +void dw_hdmi_set_sample_width(struct dw_hdmi *hdmi, unsigned int width);
>   void dw_hdmi_set_sample_rate(struct dw_hdmi *hdmi, unsigned int rate);
>   void dw_hdmi_set_channel_count(struct dw_hdmi *hdmi, unsigned int cnt);
>   void dw_hdmi_set_channel_status(struct dw_hdmi *hdmi, u8 *channel_status);

Re: [PATCH v2 1/5] drm: bridge: dw_hdmi: cec: Add cec suspend/resume function

[Neil Armstrong]

On 08/04/2022 12:32, Sandor Yu wrote:
> CEC interrupt status/mask and logical address registers
> will be reset when device enter suspend.
> It will cause cec fail to work after device resume.
> Add CEC suspend/resume functions, reinitialize logical address registers
> and restore interrupt status/mask registers after resume.
> 
> Signed-off-by: Sandor Yu <Sandor.yu@nxp.com>
> ---
>   drivers/gpu/drm/bridge/synopsys/dw-hdmi-cec.c | 37 +++++++++++++++++++
>   1 file changed, 37 insertions(+)
> 
> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-cec.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-cec.c
> index c8f44bcb298a..ab176401b727 100644
> --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-cec.c
> +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-cec.c
> @@ -62,6 +62,10 @@ struct dw_hdmi_cec {
>   	bool rx_done;
>   	struct cec_notifier *notify;
>   	int irq;
> +
> +	u8 regs_polarity;
> +	u8 regs_mask;
> +	u8 regs_mute_stat0;
>   };
>   
>   static void dw_hdmi_write(struct dw_hdmi_cec *cec, u8 val, int offset)
> @@ -306,11 +310,44 @@ static int dw_hdmi_cec_remove(struct platform_device *pdev)
>   	return 0;
>   }
>   
> +static int __maybe_unused dw_hdmi_cec_resume(struct device *dev)
> +{
> +	struct dw_hdmi_cec *cec = dev_get_drvdata(dev);
> +
> +	/* Restore logical address */
> +	dw_hdmi_write(cec, cec->addresses & 255, HDMI_CEC_ADDR_L);
> +	dw_hdmi_write(cec, cec->addresses >> 8, HDMI_CEC_ADDR_H);
> +
> +	/* Restore interrupt status/mask register */
> +	dw_hdmi_write(cec, cec->regs_polarity, HDMI_CEC_POLARITY);
> +	dw_hdmi_write(cec, cec->regs_mask, HDMI_CEC_MASK);
> +	dw_hdmi_write(cec, cec->regs_mute_stat0, HDMI_IH_MUTE_CEC_STAT0);
> +
> +	return 0;
> +}
> +
> +static int __maybe_unused dw_hdmi_cec_suspend(struct device *dev)
> +{
> +	struct dw_hdmi_cec *cec = dev_get_drvdata(dev);
> +
> +	/* store interrupt status/mask register */
> +	 cec->regs_polarity = dw_hdmi_read(cec, HDMI_CEC_POLARITY);
> +	 cec->regs_mask = dw_hdmi_read(cec, HDMI_CEC_MASK);
> +	 cec->regs_mute_stat0 = dw_hdmi_read(cec, HDMI_IH_MUTE_CEC_STAT0);
> +
> +	return 0;
> +}
> +
> +static const struct dev_pm_ops dw_hdmi_cec_pm = {
> +	SET_SYSTEM_SLEEP_PM_OPS(dw_hdmi_cec_suspend, dw_hdmi_cec_resume)
> +};
> +
>   static struct platform_driver dw_hdmi_cec_driver = {
>   	.probe	= dw_hdmi_cec_probe,
>   	.remove	= dw_hdmi_cec_remove,
>   	.driver = {
>   		.name = "dw-hdmi-cec",
> +		.pm = &dw_hdmi_cec_pm,
>   	},
>   };
>   module_platform_driver(dw_hdmi_cec_driver);

As Hans said on v1, why don't you call dw_hdmi_cec_enable(cec->adap, false) in suspend and dw_hdmi_cec_enable(cec->adap, true) in resume ?

With this, CEC engine is not disabled on suspend.

Do you plan to use the engine from the suspend code ?

Neil

Re: [PATCH v2 1/5] drm: bridge: dw_hdmi: cec: Add cec suspend/resume function

[Jernej Škrabec]

Dne petek, 08. april 2022 ob 15:41:36 CEST je Neil Armstrong napisal(a):
> On 08/04/2022 12:32, Sandor Yu wrote:
> > CEC interrupt status/mask and logical address registers
> > will be reset when device enter suspend.
> > It will cause cec fail to work after device resume.
> > Add CEC suspend/resume functions, reinitialize logical address registers
> > and restore interrupt status/mask registers after resume.
> > 
> > Signed-off-by: Sandor Yu <Sandor.yu@nxp.com>
> > ---
> > 
> >   drivers/gpu/drm/bridge/synopsys/dw-hdmi-cec.c | 37 +++++++++++++++++++
> >   1 file changed, 37 insertions(+)
> > 
> > diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-cec.c
> > b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-cec.c index
> > c8f44bcb298a..ab176401b727 100644
> > --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-cec.c
> > +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-cec.c
> > @@ -62,6 +62,10 @@ struct dw_hdmi_cec {
> > 
> >   	bool rx_done;
> >   	struct cec_notifier *notify;
> >   	int irq;
> > 
> > +
> > +	u8 regs_polarity;
> > +	u8 regs_mask;
> > +	u8 regs_mute_stat0;
> > 
> >   };
> >   
> >   static void dw_hdmi_write(struct dw_hdmi_cec *cec, u8 val, int offset)
> > 
> > @@ -306,11 +310,44 @@ static int dw_hdmi_cec_remove(struct platform_device
> > *pdev)> 
> >   	return 0;
> >   
> >   }
> > 
> > +static int __maybe_unused dw_hdmi_cec_resume(struct device *dev)
> > +{
> > +	struct dw_hdmi_cec *cec = dev_get_drvdata(dev);
> > +
> > +	/* Restore logical address */
> > +	dw_hdmi_write(cec, cec->addresses & 255, HDMI_CEC_ADDR_L);
> > +	dw_hdmi_write(cec, cec->addresses >> 8, HDMI_CEC_ADDR_H);
> > +
> > +	/* Restore interrupt status/mask register */
> > +	dw_hdmi_write(cec, cec->regs_polarity, HDMI_CEC_POLARITY);
> > +	dw_hdmi_write(cec, cec->regs_mask, HDMI_CEC_MASK);
> > +	dw_hdmi_write(cec, cec->regs_mute_stat0, HDMI_IH_MUTE_CEC_STAT0);
> > +
> > +	return 0;
> > +}
> > +
> > +static int __maybe_unused dw_hdmi_cec_suspend(struct device *dev)
> > +{
> > +	struct dw_hdmi_cec *cec = dev_get_drvdata(dev);
> > +
> > +	/* store interrupt status/mask register */
> > +	 cec->regs_polarity = dw_hdmi_read(cec, HDMI_CEC_POLARITY);
> > +	 cec->regs_mask = dw_hdmi_read(cec, HDMI_CEC_MASK);
> > +	 cec->regs_mute_stat0 = dw_hdmi_read(cec, HDMI_IH_MUTE_CEC_STAT0);
> > +
> > +	return 0;
> > +}
> > +
> > +static const struct dev_pm_ops dw_hdmi_cec_pm = {
> > +	SET_SYSTEM_SLEEP_PM_OPS(dw_hdmi_cec_suspend, dw_hdmi_cec_resume)
> > +};
> > +
> > 
> >   static struct platform_driver dw_hdmi_cec_driver = {
> >   
> >   	.probe	= dw_hdmi_cec_probe,
> >   	.remove	= dw_hdmi_cec_remove,
> >   	.driver = {
> >   	
> >   		.name = "dw-hdmi-cec",
> > 
> > +		.pm = &dw_hdmi_cec_pm,
> > 
> >   	},
> >   
> >   };
> >   module_platform_driver(dw_hdmi_cec_driver);
> 
> As Hans said on v1, why don't you call dw_hdmi_cec_enable(cec->adap, false)
> in suspend and dw_hdmi_cec_enable(cec->adap, true) in resume ?
> 
> With this, CEC engine is not disabled on suspend.

This should not be done, at least not unconditionally. CEC wakeup 
functionality is used by Crust firmware for Allwinner boards. In fact, DW HDMI 
CEC controller was designed with suspend/resume functionality in mind. If 
properly set, it can autonomously scan for preset CEC messages and generate 
interrupt when found.

Actually, I'm not fan of this patch, since it looks like workaround for power 
management firmware not restoring previous state. Or is this HW issue? In any 
case, Allwinner SoCs with DW-HDMI CEC don't need restoring any register, so 
it's certainly not a general issue.

> 
> Do you plan to use the engine from the suspend code ?

As mentioned before, it's already done for Allwinner, so CEC should remain 
enabled.

Best regards,
Jernej

> 
> Neil

Re: [PATCH v2 4/5] drm: bridge: dw_hdmi: add reset function for PHY GEN1

[Jernej Škrabec]

Dne petek, 08. april 2022 ob 14:22:52 CEST je Neil Armstrong napisal(a):
> On 08/04/2022 12:32, Sandor Yu wrote:
> > PHY reset register(MC_PHYRSTZ) active high reset control for PHY GEN2,
> > and active low reset control for PHY GEN1.
> > 
> > Rename function dw_hdmi_phy_reset to dw_hdmi_phy_gen2_reset.
> > Add dw_hdmi_phy_gen1_reset function for PHY GEN1.
> > 
> > Signed-off-by: Sandor Yu <Sandor.yu@nxp.com>
> > ---
> > 
> >   drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 14 +++++++++++---
> >   drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c    |  2 +-
> >   include/drm/bridge/dw_hdmi.h              |  4 +++-
> >   3 files changed, 15 insertions(+), 5 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> > b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c index
> > 5a7ec066e37a..13270d96e5be 100644
> > --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> > +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> > @@ -1369,13 +1369,21 @@ static void
> > dw_hdmi_phy_sel_interface_control(struct dw_hdmi *hdmi, u8 enable)> 
> >   			 HDMI_PHY_CONF0_SELDIPIF_MASK);
> >   
> >   }
> > 
> > -void dw_hdmi_phy_reset(struct dw_hdmi *hdmi)
> > +void dw_hdmi_phy_gen1_reset(struct dw_hdmi *hdmi)
> > +{
> > +	/* PHY reset. The reset signal is active low on Gen1 PHYs. */
> > +	hdmi_writeb(hdmi, 0, HDMI_MC_PHYRSTZ);
> > +	hdmi_writeb(hdmi, HDMI_MC_PHYRSTZ_PHYRSTZ, HDMI_MC_PHYRSTZ);
> > +}
> > +EXPORT_SYMBOL_GPL(dw_hdmi_phy_gen1_reset);
> > +
> > +void dw_hdmi_phy_gen2_reset(struct dw_hdmi *hdmi)
> > 
> >   {
> >   
> >   	/* PHY reset. The reset signal is active high on Gen2 PHYs. */
> >   	hdmi_writeb(hdmi, HDMI_MC_PHYRSTZ_PHYRSTZ, HDMI_MC_PHYRSTZ);
> >   	hdmi_writeb(hdmi, 0, HDMI_MC_PHYRSTZ);
> >   
> >   }
> > 
> > -EXPORT_SYMBOL_GPL(dw_hdmi_phy_reset);
> > +EXPORT_SYMBOL_GPL(dw_hdmi_phy_gen2_reset);
> > 
> >   void dw_hdmi_phy_i2c_set_addr(struct dw_hdmi *hdmi, u8 address)
> >   {
> > 
> > @@ -1529,7 +1537,7 @@ static int hdmi_phy_configure(struct dw_hdmi *hdmi,
> > 
> >   	if (phy->has_svsret)
> >   	
> >   		dw_hdmi_phy_enable_svsret(hdmi, 1);
> > 
> > -	dw_hdmi_phy_reset(hdmi);
> > +	dw_hdmi_phy_gen2_reset(hdmi);
> > 
> >   	hdmi_writeb(hdmi, HDMI_MC_HEACPHY_RST_ASSERT, 
HDMI_MC_HEACPHY_RST);
> > 
> > diff --git a/drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c
> > b/drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c index 5e2b0175df36..2860e6bff8b7
> > 100644
> > --- a/drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c
> > +++ b/drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c
> > @@ -135,7 +135,7 @@ static int sun8i_hdmi_phy_config_a83t(struct dw_hdmi
> > *hdmi,> 
> >   	dw_hdmi_phy_gen2_txpwron(hdmi, 0);
> >   	dw_hdmi_phy_gen2_pddq(hdmi, 1);
> > 
> > -	dw_hdmi_phy_reset(hdmi);
> > +	dw_hdmi_phy_gen2_reset(hdmi);
> > 
> >   	dw_hdmi_phy_gen2_pddq(hdmi, 0);
> > 
> > diff --git a/include/drm/bridge/dw_hdmi.h b/include/drm/bridge/dw_hdmi.h
> > index 2a1f85f9a8a3..70082f80a8c8 100644
> > --- a/include/drm/bridge/dw_hdmi.h
> > +++ b/include/drm/bridge/dw_hdmi.h
> > @@ -187,9 +187,11 @@ void dw_hdmi_phy_i2c_set_addr(struct dw_hdmi *hdmi,
> > u8 address);> 
> >   void dw_hdmi_phy_i2c_write(struct dw_hdmi *hdmi, unsigned short data,
> >   
> >   			   unsigned char addr);
> > 
> > +void dw_hdmi_phy_gen1_reset(struct dw_hdmi *hdmi);
> > +
> > 
> >   void dw_hdmi_phy_gen2_pddq(struct dw_hdmi *hdmi, u8 enable);
> >   void dw_hdmi_phy_gen2_txpwron(struct dw_hdmi *hdmi, u8 enable);
> > 
> > -void dw_hdmi_phy_reset(struct dw_hdmi *hdmi);
> > +void dw_hdmi_phy_gen2_reset(struct dw_hdmi *hdmi);
> > 
> >   enum drm_connector_status dw_hdmi_phy_read_hpd(struct dw_hdmi *hdmi,
> >   
> >   					       void *data);
> 
> Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>

Acked-by: Jernej Skrabec <jernej.skrabec@gmail.com>

Best regards,
Jernej

> 
> If a sun4i drm maintainer can ack, then it would be all good to apply.
> 
> Neil

Re: [PATCH v2 2/5] drm: bridge: dw_hdmi: default enable workaround to clear the overflow

[Jernej Škrabec]

Dne petek, 08. april 2022 ob 12:32:25 CEST je Sandor Yu napisal(a):
> i.MX8MPlus (v2.13a) has verified need the workaround to clear the
> overflow with one iteration.
> Only i.MX6Q(v1.30a) need the workaround with 4 iterations,
> the others versions later than v1.3a have been identified as needing
> the workaround with a single iteration.
> 
> Default enable the workaround with one iteration for all versions
> later than v1.30a.
> 
> Signed-off-by: Sandor Yu <Sandor.yu@nxp.com>
> ---
>  drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 23 +++++++----------------
>  1 file changed, 7 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c index
> 4befc104d220..02d8f7e08814 100644
> --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> @@ -2086,30 +2086,21 @@ static void dw_hdmi_clear_overflow(struct dw_hdmi
> *hdmi) * then write one of the FC registers several times.
>  	 *
>  	 * The number of iterations matters and depends on the HDMI TX 
revision
> -	 * (and possibly on the platform). So far i.MX6Q (v1.30a), i.MX6DL
> -	 * (v1.31a) and multiple Allwinner SoCs (v1.32a) have been 
identified
> -	 * as needing the workaround, with 4 iterations for v1.30a and 1
> -	 * iteration for others.
> -	 * The Amlogic Meson GX SoCs (v2.01a) have been identified as 
needing
> -	 * the workaround with a single iteration.
> -	 * The Rockchip RK3288 SoC (v2.00a) and RK3328/RK3399 SoCs 
(v2.11a) have
> -	 * been identified as needing the workaround with a single 
iteration.
> +	 * (and possibly on the platform).
> +	 * 4 iterations for i.MX6Q(v1.30a) and 1 iteration for others.
> +	 * i.MX6DL (v1.31a), Allwinner SoCs (v1.32a), Rockchip RK3288 SoC
> (v2.00a), +	 * Amlogic Meson GX SoCs (v2.01a), RK3328/RK3399 SoCs (v2.11a)
> +	 * and i.MX8MPlus (v2.13a) have been identified as needing the 
workaround
> +	 * with a single iteration.
>  	 */

It would be easier to read and modify later if platforms/controllers/variants 
are given as list, one per line, but it could be done later.

Best regards,
Jernej

> 
>  	switch (hdmi->version) {
>  	case 0x130a:
>  		count = 4;
>  		break;
> -	case 0x131a:
> -	case 0x132a:
> -	case 0x200a:
> -	case 0x201a:
> -	case 0x211a:
> -	case 0x212a:
> +	default:
>  		count = 1;
>  		break;
> -	default:
> -		return;
>  	}
> 
>  	/* TMDS software reset */

Re: [PATCH v2 1/5] drm: bridge: dw_hdmi: cec: Add cec suspend/resume function

[Neil Armstrong]

On 10/04/2022 12:13, Jernej Škrabec wrote:
> Dne petek, 08. april 2022 ob 15:41:36 CEST je Neil Armstrong napisal(a):
>> On 08/04/2022 12:32, Sandor Yu wrote:
>>> CEC interrupt status/mask and logical address registers
>>> will be reset when device enter suspend.
>>> It will cause cec fail to work after device resume.
>>> Add CEC suspend/resume functions, reinitialize logical address registers
>>> and restore interrupt status/mask registers after resume.
>>>
>>> Signed-off-by: Sandor Yu <Sandor.yu@nxp.com>
>>> ---
>>>
>>>    drivers/gpu/drm/bridge/synopsys/dw-hdmi-cec.c | 37 +++++++++++++++++++
>>>    1 file changed, 37 insertions(+)
>>>
>>> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-cec.c
>>> b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-cec.c index
>>> c8f44bcb298a..ab176401b727 100644
>>> --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-cec.c
>>> +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-cec.c
>>> @@ -62,6 +62,10 @@ struct dw_hdmi_cec {
>>>
>>>    	bool rx_done;
>>>    	struct cec_notifier *notify;
>>>    	int irq;
>>>
>>> +
>>> +	u8 regs_polarity;
>>> +	u8 regs_mask;
>>> +	u8 regs_mute_stat0;
>>>
>>>    };
>>>    
>>>    static void dw_hdmi_write(struct dw_hdmi_cec *cec, u8 val, int offset)
>>>
>>> @@ -306,11 +310,44 @@ static int dw_hdmi_cec_remove(struct platform_device
>>> *pdev)>
>>>    	return 0;
>>>    
>>>    }
>>>
>>> +static int __maybe_unused dw_hdmi_cec_resume(struct device *dev)
>>> +{
>>> +	struct dw_hdmi_cec *cec = dev_get_drvdata(dev);
>>> +
>>> +	/* Restore logical address */
>>> +	dw_hdmi_write(cec, cec->addresses & 255, HDMI_CEC_ADDR_L);
>>> +	dw_hdmi_write(cec, cec->addresses >> 8, HDMI_CEC_ADDR_H);
>>> +
>>> +	/* Restore interrupt status/mask register */
>>> +	dw_hdmi_write(cec, cec->regs_polarity, HDMI_CEC_POLARITY);
>>> +	dw_hdmi_write(cec, cec->regs_mask, HDMI_CEC_MASK);
>>> +	dw_hdmi_write(cec, cec->regs_mute_stat0, HDMI_IH_MUTE_CEC_STAT0);
>>> +
>>> +	return 0;
>>> +}
>>> +
>>> +static int __maybe_unused dw_hdmi_cec_suspend(struct device *dev)
>>> +{
>>> +	struct dw_hdmi_cec *cec = dev_get_drvdata(dev);
>>> +
>>> +	/* store interrupt status/mask register */
>>> +	 cec->regs_polarity = dw_hdmi_read(cec, HDMI_CEC_POLARITY);
>>> +	 cec->regs_mask = dw_hdmi_read(cec, HDMI_CEC_MASK);
>>> +	 cec->regs_mute_stat0 = dw_hdmi_read(cec, HDMI_IH_MUTE_CEC_STAT0);
>>> +
>>> +	return 0;
>>> +}
>>> +
>>> +static const struct dev_pm_ops dw_hdmi_cec_pm = {
>>> +	SET_SYSTEM_SLEEP_PM_OPS(dw_hdmi_cec_suspend, dw_hdmi_cec_resume)
>>> +};
>>> +
>>>
>>>    static struct platform_driver dw_hdmi_cec_driver = {
>>>    
>>>    	.probe	= dw_hdmi_cec_probe,
>>>    	.remove	= dw_hdmi_cec_remove,
>>>    	.driver = {
>>>    	
>>>    		.name = "dw-hdmi-cec",
>>>
>>> +		.pm = &dw_hdmi_cec_pm,
>>>
>>>    	},
>>>    
>>>    };
>>>    module_platform_driver(dw_hdmi_cec_driver);
>>
>> As Hans said on v1, why don't you call dw_hdmi_cec_enable(cec->adap, false)
>> in suspend and dw_hdmi_cec_enable(cec->adap, true) in resume ?
>>
>> With this, CEC engine is not disabled on suspend.
> 
> This should not be done, at least not unconditionally. CEC wakeup
> functionality is used by Crust firmware for Allwinner boards. In fact, DW HDMI
> CEC controller was designed with suspend/resume functionality in mind. If
> properly set, it can autonomously scan for preset CEC messages and generate
> interrupt when found.
> 
> Actually, I'm not fan of this patch, since it looks like workaround for power
> management firmware not restoring previous state. Or is this HW issue? In any
> case, Allwinner SoCs with DW-HDMI CEC don't need restoring any register, so
> it's certainly not a general issue.

In this case I think it should explicit in the hdmi_plat_data to either let
CEC enabled on suspend or then disable CEC on suspend.

> 
>>
>> Do you plan to use the engine from the suspend code ?
> 
> As mentioned before, it's already done for Allwinner, so CEC should remain
> enabled

Thanks for confirming that

> 
> Best regards,
> Jernej
> 
>>
>> Neil
> 
> 
> 
> 

Neil

RE: [EXT] Re: [PATCH v2 1/5] drm: bridge: dw_hdmi: cec: Add cec suspend/resume function

[Sandor Yu]

> -----Original Message-----
> From: Jernej Škrabec <jernej.skrabec@gmail.com>
> Sent: 2022年4月10日 18:13
> To: Sandor Yu <sandor.yu@nxp.com>; dri-devel@lists.freedesktop.org;
> linux-kernel@vger.kernel.org; andrzej.hajda@intel.com;
> robert.foss@linaro.org; Laurent.pinchart@ideasonboard.com;
> jonas@kwiboo.se; hverkuil-cisco@xs4all.nl; Neil Armstrong
> <narmstrong@baylibre.com>
> Cc: S.J. Wang <shengjiu.wang@nxp.com>; cai.huoqing@linux.dev;
> maxime@cerno.tech; harry.wentland@amd.com
> Subject: [EXT] Re: [PATCH v2 1/5] drm: bridge: dw_hdmi: cec: Add cec
> suspend/resume function
> 
> Caution: EXT Email
> 
> Dne petek, 08. april 2022 ob 15:41:36 CEST je Neil Armstrong napisal(a):
> > On 08/04/2022 12:32, Sandor Yu wrote:
> > > CEC interrupt status/mask and logical address registers will be
> > > reset when device enter suspend.
> > > It will cause cec fail to work after device resume.
> > > Add CEC suspend/resume functions, reinitialize logical address
> > > registers and restore interrupt status/mask registers after resume.
> > >
> > > Signed-off-by: Sandor Yu <Sandor.yu@nxp.com>
> > > ---
> > >
> > >   drivers/gpu/drm/bridge/synopsys/dw-hdmi-cec.c | 37
> +++++++++++++++++++
> > >   1 file changed, 37 insertions(+)
> > >
> > > diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-cec.c
> > > b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-cec.c index
> > > c8f44bcb298a..ab176401b727 100644
> > > --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-cec.c
> > > +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-cec.c
> > > @@ -62,6 +62,10 @@ struct dw_hdmi_cec {
> > >
> > >     bool rx_done;
> > >     struct cec_notifier *notify;
> > >     int irq;
> > >
> > > +
> > > +   u8 regs_polarity;
> > > +   u8 regs_mask;
> > > +   u8 regs_mute_stat0;
> > >
> > >   };
> > >
> > >   static void dw_hdmi_write(struct dw_hdmi_cec *cec, u8 val, int
> > > offset)
> > >
> > > @@ -306,11 +310,44 @@ static int dw_hdmi_cec_remove(struct
> > > platform_device *pdev)>
> > >     return 0;
> > >
> > >   }
> > >
> > > +static int __maybe_unused dw_hdmi_cec_resume(struct device *dev) {
> > > +   struct dw_hdmi_cec *cec = dev_get_drvdata(dev);
> > > +
> > > +   /* Restore logical address */
> > > +   dw_hdmi_write(cec, cec->addresses & 255, HDMI_CEC_ADDR_L);
> > > +   dw_hdmi_write(cec, cec->addresses >> 8, HDMI_CEC_ADDR_H);
> > > +
> > > +   /* Restore interrupt status/mask register */
> > > +   dw_hdmi_write(cec, cec->regs_polarity, HDMI_CEC_POLARITY);
> > > +   dw_hdmi_write(cec, cec->regs_mask, HDMI_CEC_MASK);
> > > +   dw_hdmi_write(cec, cec->regs_mute_stat0,
> > > + HDMI_IH_MUTE_CEC_STAT0);
> > > +
> > > +   return 0;
> > > +}
> > > +
> > > +static int __maybe_unused dw_hdmi_cec_suspend(struct device *dev) {
> > > +   struct dw_hdmi_cec *cec = dev_get_drvdata(dev);
> > > +
> > > +   /* store interrupt status/mask register */
> > > +    cec->regs_polarity = dw_hdmi_read(cec, HDMI_CEC_POLARITY);
> > > +    cec->regs_mask = dw_hdmi_read(cec, HDMI_CEC_MASK);
> > > +    cec->regs_mute_stat0 = dw_hdmi_read(cec,
> > > + HDMI_IH_MUTE_CEC_STAT0);
> > > +
> > > +   return 0;
> > > +}
> > > +
> > > +static const struct dev_pm_ops dw_hdmi_cec_pm = {
> > > +   SET_SYSTEM_SLEEP_PM_OPS(dw_hdmi_cec_suspend,
> dw_hdmi_cec_resume)
> > > +};
> > > +
> > >
> > >   static struct platform_driver dw_hdmi_cec_driver = {
> > >
> > >     .probe  = dw_hdmi_cec_probe,
> > >     .remove = dw_hdmi_cec_remove,
> > >     .driver = {
> > >
> > >             .name = "dw-hdmi-cec",
> > >
> > > +           .pm = &dw_hdmi_cec_pm,
> > >
> > >     },
> > >
> > >   };
> > >   module_platform_driver(dw_hdmi_cec_driver);
> >
> > As Hans said on v1, why don't you call dw_hdmi_cec_enable(cec->adap,
> > false) in suspend and dw_hdmi_cec_enable(cec->adap, true) in resume ?
> >
> > With this, CEC engine is not disabled on suspend.
> 
> This should not be done, at least not unconditionally. CEC wakeup
> functionality is used by Crust firmware for Allwinner boards. In fact, DW HDMI
> CEC controller was designed with suspend/resume functionality in mind. If
> properly set, it can autonomously scan for preset CEC messages and generate
> interrupt when found.
> 
> Actually, I'm not fan of this patch, since it looks like workaround for power
> management firmware not restoring previous state. Or is this HW issue? In
> any case, Allwinner SoCs with DW-HDMI CEC don't need restoring any register,
> so it's certainly not a general issue.
> 
For NXP i.MX8MPlus SOC, CEC wakeup function is not required.
And the HDMI TX power domain could be gated off with CEC engine when suspend. 
Restore those registers in order to keep EARC/ARC in working after resume when HDMI TX power domain off in suspend.
It could be use by other SOC for extremely low power case.

B.R
Sandor
>  
> >
> > Do you plan to use the engine from the suspend code ?
> 
> As mentioned before, it's already done for Allwinner, so CEC should remain
> enabled.
> 
> Best regards,
> Jernej
> 
> >
> > Neil
> 
> 
> 

RE: [EXT] Re: [PATCH v2 5/5] drm: bridge: dw_hdmi: Audio: Add General Parallel Audio (GPA) driver

[Sandor Yu]

> -----Original Message-----
> From: Neil Armstrong <narmstrong@baylibre.com>
> Sent: 2022年4月8日 20:52
> To: Sandor Yu <sandor.yu@nxp.com>; dri-devel@lists.freedesktop.org;
> linux-kernel@vger.kernel.org; andrzej.hajda@intel.com;
> robert.foss@linaro.org; Laurent.pinchart@ideasonboard.com;
> jonas@kwiboo.se; jernej.skrabec@gmail.com; hverkuil-cisco@xs4all.nl
> Cc: S.J. Wang <shengjiu.wang@nxp.com>; cai.huoqing@linux.dev;
> maxime@cerno.tech; harry.wentland@amd.com
> Subject: [EXT] Re: [PATCH v2 5/5] drm: bridge: dw_hdmi: Audio: Add General
> Parallel Audio (GPA) driver
> 
> Caution: EXT Email
> 
> On 08/04/2022 12:32, Sandor Yu wrote:
> > General Parallel Audio (GPA) interface is one of the supported audio
> > interface for synopsys HDMI module, which has verified for i.MX8MPlus
> > platform.
> > This is initial version for GPA.
> >
> > Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
> > Signed-off-by: Sandor Yu <Sandor.yu@nxp.com>
> > ---
> >   drivers/gpu/drm/bridge/synopsys/Kconfig       |  10 +
> >   drivers/gpu/drm/bridge/synopsys/Makefile      |   1 +
> >   .../drm/bridge/synopsys/dw-hdmi-gp-audio.c    | 199
> ++++++++++++++++++
> >   drivers/gpu/drm/bridge/synopsys/dw-hdmi.c     | 128 ++++++++++-
> >   drivers/gpu/drm/bridge/synopsys/dw-hdmi.h     |  13 +-
> >   include/drm/bridge/dw_hdmi.h                  |   5 +
> >   6 files changed, 353 insertions(+), 3 deletions(-)
> >   create mode 100644
> > drivers/gpu/drm/bridge/synopsys/dw-hdmi-gp-audio.c
> >
> > diff --git a/drivers/gpu/drm/bridge/synopsys/Kconfig
> > b/drivers/gpu/drm/bridge/synopsys/Kconfig
> > index 21a1be3ced0f..a4a31b669b65 100644
> > --- a/drivers/gpu/drm/bridge/synopsys/Kconfig
> > +++ b/drivers/gpu/drm/bridge/synopsys/Kconfig
> > @@ -25,6 +25,16 @@ config DRM_DW_HDMI_I2S_AUDIO
> >         Support the I2S Audio interface which is part of the Synopsys
> >         Designware HDMI block.
> >
> > +config DRM_DW_HDMI_GP_AUDIO
> > +     tristate "Synopsys Designware GP Audio interface"
> > +     depends on DRM_DW_HDMI && SND
> > +     select SND_PCM
> > +     select SND_PCM_ELD
> > +     select SND_PCM_IEC958
> > +     help
> > +       Support the GP Audio interface which is part of the Synopsys
> > +       Designware HDMI block.
> > +
> >   config DRM_DW_HDMI_CEC
> >       tristate "Synopsis Designware CEC interface"
> >       depends on DRM_DW_HDMI
> > diff --git a/drivers/gpu/drm/bridge/synopsys/Makefile
> > b/drivers/gpu/drm/bridge/synopsys/Makefile
> > index 91d746ad5de1..ce715562e9e5 100644
> > --- a/drivers/gpu/drm/bridge/synopsys/Makefile
> > +++ b/drivers/gpu/drm/bridge/synopsys/Makefile
> > @@ -1,6 +1,7 @@
> >   # SPDX-License-Identifier: GPL-2.0-only
> >   obj-$(CONFIG_DRM_DW_HDMI) += dw-hdmi.o
> >   obj-$(CONFIG_DRM_DW_HDMI_AHB_AUDIO) += dw-hdmi-ahb-audio.o
> > +obj-$(CONFIG_DRM_DW_HDMI_GP_AUDIO) += dw-hdmi-gp-audio.o
> >   obj-$(CONFIG_DRM_DW_HDMI_I2S_AUDIO) += dw-hdmi-i2s-audio.o
> >   obj-$(CONFIG_DRM_DW_HDMI_CEC) += dw-hdmi-cec.o
> >
> > diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-gp-audio.c
> > b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-gp-audio.c
> > new file mode 100644
> > index 000000000000..10a957c85a83
> > --- /dev/null
> > +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-gp-audio.c
> > @@ -0,0 +1,199 @@
> > +// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
> > +/*
> > + * dw-hdmi-gp-audio.c
> > + *
> > + * Copyright 2020-2022 NXP
> > + */
> > +#include <linux/io.h>
> > +#include <linux/interrupt.h>
> > +#include <linux/module.h>
> > +#include <linux/platform_device.h>
> > +#include <linux/dmaengine.h>
> > +#include <linux/dma-mapping.h>
> > +#include <drm/bridge/dw_hdmi.h>
> > +#include <drm/drm_edid.h>
> > +#include <drm/drm_connector.h>
> > +
> > +#include <sound/hdmi-codec.h>
> > +#include <sound/asoundef.h>
> > +#include <sound/core.h>
> > +#include <sound/initval.h>
> > +#include <sound/pcm.h>
> > +#include <sound/pcm_drm_eld.h>
> > +#include <sound/pcm_iec958.h>
> > +#include <sound/dmaengine_pcm.h>
> > +
> > +#include "dw-hdmi-audio.h"
> > +
> > +#define DRIVER_NAME "dw-hdmi-gp-audio"
> > +#define DRV_NAME    "hdmi-gp-audio"
> > +
> > +struct snd_dw_hdmi {
> > +     struct dw_hdmi_audio_data data;
> > +     struct platform_device  *audio_pdev;
> > +     unsigned int pos;
> > +};
> > +
> > +struct dw_hdmi_channel_conf {
> > +     u8 conf1;
> > +     u8 ca;
> > +};
> > +
> > +/*
> > + * The default mapping of ALSA channels to HDMI channels and speaker
> > + * allocation bits.  Note that we can't do channel remapping here -
> > + * channels must be in the same order.
> > + *
> > + * Mappings for alsa-lib pcm/surround*.conf files:
> > + *
> > + *           Front   Sur4.0  Sur4.1  Sur5.0  Sur5.1  Sur7.1
> > + * Channels  2       4       6       6       6       8
> > + *
> > + * Our mapping from ALSA channel to CEA686D speaker name and HDMI
> channel:
> > + *
> > + *                           Number of ALSA channels
> > + * ALSA Channel      2       3       4       5       6       7
> 8
> > + * 0         FL:0    =       =       =       =       =
> =
> > + * 1         FR:1    =       =       =       =       =
> =
> > + * 2                 FC:3    RL:4    LFE:2   =       =       =
> > + * 3                         RR:5    RL:4    FC:3    =       =
> > + * 4                                 RR:5    RL:4    =
> =
> > + * 5                                         RR:5    =
> =
> > + * 6                                                 RC:6
> =
> > + * 7                                                 RLC/FRC
> RLC/FRC
> > + */
> > +static struct dw_hdmi_channel_conf default_hdmi_channel_config[7] = {
> > +     { 0x03, 0x00 }, /* FL,FR */
> > +     { 0x0b, 0x02 }, /* FL,FR,FC */
> > +     { 0x33, 0x08 }, /* FL,FR,RL,RR */
> > +     { 0x37, 0x09 }, /* FL,FR,LFE,RL,RR */
> > +     { 0x3f, 0x0b }, /* FL,FR,LFE,FC,RL,RR */
> > +     { 0x7f, 0x0f }, /* FL,FR,LFE,FC,RL,RR,RC */
> > +     { 0xff, 0x13 }, /* FL,FR,LFE,FC,RL,RR,[FR]RC,[FR]LC */ };
> > +
> > +static int audio_hw_params(struct device *dev,  void *data,
> > +                        struct hdmi_codec_daifmt *daifmt,
> > +                        struct hdmi_codec_params *params) {
> > +     struct snd_dw_hdmi *dw = dev_get_drvdata(dev);
> > +     int ret = 0;
> > +     u8 ca;
> > +
> > +     dw_hdmi_set_sample_rate(dw->data.hdmi, params->sample_rate);
> > +
> > +     ca = default_hdmi_channel_config[params->channels - 2].ca;
> > +
> > +     dw_hdmi_set_channel_count(dw->data.hdmi, params->channels);
> > +     dw_hdmi_set_channel_allocation(dw->data.hdmi, ca);
> > +
> > +     dw_hdmi_set_sample_non_pcm(dw->data.hdmi,
> > +                                params->iec.status[0] &
> IEC958_AES0_NONAUDIO);
> > +     dw_hdmi_set_sample_width(dw->data.hdmi,
> params->sample_width);
> > +
> > +     return ret;
> > +}
> > +
> > +static void audio_shutdown(struct device *dev, void *data) { }
> > +
> > +static int audio_mute_stream(struct device *dev, void *data,
> > +                           bool enable, int direction) {
> > +     struct snd_dw_hdmi *dw = dev_get_drvdata(dev);
> > +     int ret = 0;
> > +
> > +     if (!enable)
> > +             dw_hdmi_audio_enable(dw->data.hdmi);
> > +     else
> > +             dw_hdmi_audio_disable(dw->data.hdmi);
> > +
> > +     return ret;
> > +}
> > +
> > +static int audio_get_eld(struct device *dev, void *data,
> > +                      u8 *buf, size_t len) {
> > +     struct dw_hdmi_audio_data *audio = data;
> > +     u8 *eld;
> > +
> > +     eld = audio->get_eld(audio->hdmi);
> > +     if (eld)
> > +             memcpy(buf, eld, min_t(size_t, MAX_ELD_BYTES, len));
> > +     else
> > +             /* Pass en empty ELD if connector not available */
> > +             memset(buf, 0, len);
> > +
> > +     return 0;
> > +}
> > +
> > +static int audio_hook_plugged_cb(struct device *dev, void *data,
> > +                              hdmi_codec_plugged_cb fn,
> > +                              struct device *codec_dev) {
> > +     struct snd_dw_hdmi *dw = dev_get_drvdata(dev);
> > +
> > +     return dw_hdmi_set_plugged_cb(dw->data.hdmi, fn, codec_dev); }
> > +
> > +static const struct hdmi_codec_ops audio_codec_ops = {
> > +     .hw_params = audio_hw_params,
> > +     .audio_shutdown = audio_shutdown,
> > +     .mute_stream = audio_mute_stream,
> > +     .get_eld = audio_get_eld,
> > +     .hook_plugged_cb = audio_hook_plugged_cb, };
> > +
> > +static int snd_dw_hdmi_probe(struct platform_device *pdev) {
> > +     struct dw_hdmi_audio_data *data = pdev->dev.platform_data;
> > +     struct snd_dw_hdmi *dw;
> > +
> > +     const struct hdmi_codec_pdata codec_data = {
> > +             .i2s = 1,
> > +             .spdif = 0,
> > +             .ops = &audio_codec_ops,
> > +             .max_i2s_channels = 8,
> > +             .data = data,
> > +     };
> > +
> > +     dw = devm_kzalloc(&pdev->dev, sizeof(*dw), GFP_KERNEL);
> > +     if (!dw)
> > +             return -ENOMEM;
> > +
> > +     dw->data = *data;
> > +
> > +     platform_set_drvdata(pdev, dw);
> > +
> > +     dw->audio_pdev = platform_device_register_data(&pdev->dev,
> > +
> HDMI_CODEC_DRV_NAME, 1,
> > +
> &codec_data,
> > +
> > + sizeof(codec_data));
> > +
> > +     return PTR_ERR_OR_ZERO(dw->audio_pdev); }
> > +
> > +static int snd_dw_hdmi_remove(struct platform_device *pdev) {
> > +     struct snd_dw_hdmi *dw = platform_get_drvdata(pdev);
> > +
> > +     platform_device_unregister(dw->audio_pdev);
> > +
> > +     return 0;
> > +}
> > +
> > +static struct platform_driver snd_dw_hdmi_driver = {
> > +     .probe  = snd_dw_hdmi_probe,
> > +     .remove = snd_dw_hdmi_remove,
> > +     .driver = {
> > +             .name = DRIVER_NAME,
> > +     },
> > +};
> > +
> > +module_platform_driver(snd_dw_hdmi_driver);
> > +
> > +MODULE_AUTHOR("Shengjiu Wang <shengjiu.wang@nxp.com>");
> > +MODULE_DESCRIPTION("Synopsis Designware HDMI GPA ALSA
> interface");
> 
> Should be Synopsys
Thanks, I will change it.
> 
> > +MODULE_LICENSE("GPL");
> > +MODULE_ALIAS("platform:" DRIVER_NAME);
> > diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> > b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> > index 13270d96e5be..2ebbe9fc5d7f 100644
> > --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> > +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> > @@ -191,7 +191,10 @@ struct dw_hdmi {
> >
> >       spinlock_t audio_lock;
> >       struct mutex audio_mutex;
> > +     unsigned int sample_non_pcm;
> > +     unsigned int sample_width;
> >       unsigned int sample_rate;
> > +     unsigned int channels;
> >       unsigned int audio_cts;
> >       unsigned int audio_n;
> >       bool audio_enable;
> > @@ -589,6 +592,8 @@ static unsigned int hdmi_compute_n(unsigned int
> freq, unsigned long pixel_clk)
> >                       n = 4096;
> >               else if (pixel_clk == 74176000 || pixel_clk == 148352000)
> >                       n = 11648;
> > +             else if (pixel_clk == 297000000)
> > +                     n = 3072;
> >               else
> >                       n = 4096;
> >               n *= mult;
> > @@ -601,6 +606,8 @@ static unsigned int hdmi_compute_n(unsigned int
> freq, unsigned long pixel_clk)
> >                       n = 17836;
> >               else if (pixel_clk == 148352000)
> >                       n = 8918;
> > +             else if (pixel_clk == 297000000)
> > +                     n = 4704;
> >               else
> >                       n = 6272;
> >               n *= mult;
> > @@ -615,6 +622,8 @@ static unsigned int hdmi_compute_n(unsigned int
> freq, unsigned long pixel_clk)
> >                       n = 11648;
> >               else if (pixel_clk == 148352000)
> >                       n = 5824;
> > +             else if (pixel_clk == 297000000)
> > +                     n = 5120;
> >               else
> >                       n = 6144;
> >               n *= mult;
> > @@ -660,7 +669,7 @@ static void hdmi_set_clk_regenerator(struct
> dw_hdmi *hdmi,
> >       config3 = hdmi_readb(hdmi, HDMI_CONFIG3_ID);
> >
> >       /* Only compute CTS when using internal AHB audio */
> 
> Please update the comment to include GPAUD as I requested on V1.
OK.
> 
> > -     if (config3 & HDMI_CONFIG3_AHBAUDDMA) {
> > +     if ((config3 & HDMI_CONFIG3_AHBAUDDMA) || (config3 &
> > + HDMI_CONFIG3_GPAUD)) {
> >               /*
> >                * Compute the CTS value from the N value.  Note that
> CTS and N
> >                * can be up to 20 bits in total, so we need 64-bit
> > math.  Also @@ -702,6 +711,22 @@ static void
> hdmi_clk_regenerator_update_pixel_clock(struct dw_hdmi *hdmi)
> >       mutex_unlock(&hdmi->audio_mutex);
> >   }
> >
> > +void dw_hdmi_set_sample_width(struct dw_hdmi *hdmi, unsigned int
> > +width) {
> > +     mutex_lock(&hdmi->audio_mutex);
> > +     hdmi->sample_width = width;
> > +     mutex_unlock(&hdmi->audio_mutex); }
> > +EXPORT_SYMBOL_GPL(dw_hdmi_set_sample_width);
> > +
> > +void dw_hdmi_set_sample_non_pcm(struct dw_hdmi *hdmi, unsigned int
> > +non_pcm) {
> > +     mutex_lock(&hdmi->audio_mutex);
> > +     hdmi->sample_non_pcm = non_pcm;
> > +     mutex_unlock(&hdmi->audio_mutex); }
> > +EXPORT_SYMBOL_GPL(dw_hdmi_set_sample_non_pcm);
> > +
> >   void dw_hdmi_set_sample_rate(struct dw_hdmi *hdmi, unsigned int
> rate)
> >   {
> >       mutex_lock(&hdmi->audio_mutex);
> > @@ -717,6 +742,7 @@ void dw_hdmi_set_channel_count(struct dw_hdmi
> *hdmi, unsigned int cnt)
> >       u8 layout;
> >
> >       mutex_lock(&hdmi->audio_mutex);
> > +     hdmi->channels = cnt;
> >
> >       /*
> >        * For >2 channel PCM audio, we need to select layout 1 @@
> > -765,6 +791,87 @@ static u8 *hdmi_audio_get_eld(struct dw_hdmi *hdmi)
> >       return hdmi->curr_conn->eld;
> >   }
> >
> > +static void dw_hdmi_gp_audio_enable(struct dw_hdmi *hdmi) {
> > +     int sample_freq = 0x2, org_sample_freq = 0xD;
> > +     int ch_mask = BIT(hdmi->channels) - 1;
> > +
> > +     switch (hdmi->sample_rate) {
> > +     case 32000:
> > +             sample_freq = 0x03;
> > +             org_sample_freq = 0x0C;
> > +             break;
> > +     case 44100:
> > +             sample_freq = 0x00;
> > +             org_sample_freq = 0x0F;
> > +             break;
> > +     case 48000:
> > +             sample_freq = 0x02;
> > +             org_sample_freq = 0x0D;
> > +             break;
> > +     case 88200:
> > +             sample_freq = 0x08;
> > +             org_sample_freq = 0x07;
> > +             break;
> > +     case 96000:
> > +             sample_freq = 0x0A;
> > +             org_sample_freq = 0x05;
> > +             break;
> > +     case 176400:
> > +             sample_freq = 0x0C;
> > +             org_sample_freq = 0x03;
> > +             break;
> > +     case 192000:
> > +             sample_freq = 0x0E;
> > +             org_sample_freq = 0x01;
> > +             break;
> > +     default:
> > +             break;
> > +     }
> > +
> > +     hdmi_set_cts_n(hdmi, hdmi->audio_cts, hdmi->audio_n);
> > +     hdmi_enable_audio_clk(hdmi, true);
> > +
> > +     hdmi_writeb(hdmi, 0x1, HDMI_FC_AUDSCHNLS0);
> > +     hdmi_writeb(hdmi, hdmi->channels, HDMI_FC_AUDSCHNLS2);
> > +     hdmi_writeb(hdmi, 0x22, HDMI_FC_AUDSCHNLS3);
> > +     hdmi_writeb(hdmi, 0x22, HDMI_FC_AUDSCHNLS4);
> > +     hdmi_writeb(hdmi, 0x11, HDMI_FC_AUDSCHNLS5);
> > +     hdmi_writeb(hdmi, 0x11, HDMI_FC_AUDSCHNLS6);
> > +     hdmi_writeb(hdmi, (0x3 << 4) | sample_freq,
> HDMI_FC_AUDSCHNLS7);
> > +     hdmi_writeb(hdmi, (org_sample_freq << 4) | 0xb,
> > + HDMI_FC_AUDSCHNLS8);
> > +
> > +     hdmi_writeb(hdmi, ch_mask, HDMI_GP_CONF1);
> > +     hdmi_writeb(hdmi, 0x02, HDMI_GP_CONF2);
> > +     hdmi_writeb(hdmi, 0x01, HDMI_GP_CONF0);
> > +
> > +     hdmi_modb(hdmi,  0x3, 0x3, HDMI_FC_DATAUTO3);
> > +
> > +     /* hbr */
> > +     if (hdmi->sample_rate == 192000 && hdmi->channels == 8 &&
> > +         hdmi->sample_width == 32 && hdmi->sample_non_pcm) {
> > +             hdmi_modb(hdmi, 0x01, 0x01, HDMI_GP_CONF2);
> > +     }
> 
> You can drop the brackets here
OK.
> 
> > +
> > +     if (hdmi->phy.ops->enable_audio)
> > +             hdmi->phy.ops->enable_audio(hdmi, hdmi->phy.data,
> > +                                         hdmi->channels,
> > +                                         hdmi->sample_width,
> > +                                         hdmi->sample_rate,
> > +
> hdmi->sample_non_pcm);
> 
> Are this really PHY ops ? or glue ops ? it looks like it's the later.
Sure, it is not really PHY ops.
> 
> Those should eventually go in dw_hdmi_plat_data.
> 	
> Can you elaborate what is done in those callbacks ? can't you use alsa codecs
> events instead ?
> 
There is a Parallel Audio Interface between of hdmi TX and audio subsystem. 
This PAI includes IEC60958 component muxing, BPreamble decoding, 
and intermediate storage to queue results prior to being passed to the HDMI TX GPA Interface.
PAI is part of HDMI subsystem, so it is more reasonable to be enable/disable in HDMI driver.
I will move those callbacks to dw_hdmi_plat_data.

B.R
Sandor
> > +}
> > +
> > +static void dw_hdmi_gp_audio_disable(struct dw_hdmi *hdmi) {
> > +     hdmi_set_cts_n(hdmi, hdmi->audio_cts, 0);
> > +
> > +     hdmi_modb(hdmi,  0, 0x3, HDMI_FC_DATAUTO3);
> > +     if (hdmi->phy.ops->disable_audio)
> > +             hdmi->phy.ops->disable_audio(hdmi, hdmi->phy.data);
> > +
> > +     hdmi_enable_audio_clk(hdmi, false); }
> > +
> >   static void dw_hdmi_ahb_audio_enable(struct dw_hdmi *hdmi)
> >   {
> >       hdmi_set_cts_n(hdmi, hdmi->audio_cts, hdmi->audio_n); @@
> -3253,6
> > +3360,7 @@ struct dw_hdmi *dw_hdmi_probe(struct platform_device
> *pdev,
> >       hdmi->plat_data = plat_data;
> >       hdmi->dev = dev;
> >       hdmi->sample_rate = 48000;
> > +     hdmi->channels = 2;
> >       hdmi->disabled = true;
> >       hdmi->rxsense = true;
> >       hdmi->phy_mask = (u8)~(HDMI_PHY_HPD | HDMI_PHY_RX_SENSE);
> @@
> > -3476,6 +3584,24 @@ struct dw_hdmi *dw_hdmi_probe(struct
> platform_device *pdev,
> >               pdevinfo.size_data = sizeof(audio);
> >               pdevinfo.dma_mask = DMA_BIT_MASK(32);
> >               hdmi->audio = platform_device_register_full(&pdevinfo);
> > +     } else if (iores && config3 & HDMI_CONFIG3_GPAUD) {
> > +             struct dw_hdmi_audio_data audio;
> > +
> > +             audio.phys = iores->start;
> > +             audio.base = hdmi->regs;
> > +             audio.irq = irq;
> > +             audio.hdmi = hdmi;
> > +             audio.get_eld = hdmi_audio_get_eld;
> > +
> > +             hdmi->enable_audio = dw_hdmi_gp_audio_enable;
> > +             hdmi->disable_audio = dw_hdmi_gp_audio_disable;
> > +
> > +             pdevinfo.name = "dw-hdmi-gp-audio";
> > +             pdevinfo.id = PLATFORM_DEVID_NONE;
> > +             pdevinfo.data = &audio;
> > +             pdevinfo.size_data = sizeof(audio);
> > +             pdevinfo.dma_mask = DMA_BIT_MASK(32);
> > +             hdmi->audio = platform_device_register_full(&pdevinfo);
> >       }
> >
> >       if (!plat_data->disable_cec && (config0 & HDMI_CONFIG0_CEC)) {
> > diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.h
> > b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.h
> > index 1999db05bc3b..99aa1c03343b 100644
> > --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.h
> > +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.h
> > @@ -158,8 +158,17 @@
> >   #define HDMI_FC_SPDDEVICEINF                    0x1062
> >   #define HDMI_FC_AUDSCONF                        0x1063
> >   #define HDMI_FC_AUDSSTAT                        0x1064
> > -#define HDMI_FC_AUDSCHNLS7                      0x106e
> > -#define HDMI_FC_AUDSCHNLS8                      0x106f
> > +#define HDMI_FC_AUDSV                           0x1065
> > +#define HDMI_FC_AUDSU                           0x1066
> > +#define HDMI_FC_AUDSCHNLS0                       0x1067
> > +#define HDMI_FC_AUDSCHNLS1                       0x1068
> > +#define HDMI_FC_AUDSCHNLS2                       0x1069
> > +#define HDMI_FC_AUDSCHNLS3                       0x106A
> > +#define HDMI_FC_AUDSCHNLS4                       0x106B
> > +#define HDMI_FC_AUDSCHNLS5                       0x106C
> > +#define HDMI_FC_AUDSCHNLS6                       0x106D
> > +#define HDMI_FC_AUDSCHNLS7                       0x106E
> > +#define HDMI_FC_AUDSCHNLS8                       0x106F
> >   #define HDMI_FC_DATACH0FILL                     0x1070
> >   #define HDMI_FC_DATACH1FILL                     0x1071
> >   #define HDMI_FC_DATACH2FILL                     0x1072
> > diff --git a/include/drm/bridge/dw_hdmi.h
> > b/include/drm/bridge/dw_hdmi.h index 70082f80a8c8..7f73c3398a54
> 100644
> > --- a/include/drm/bridge/dw_hdmi.h
> > +++ b/include/drm/bridge/dw_hdmi.h
> > @@ -121,6 +121,9 @@ struct dw_hdmi_phy_ops {
> >       void (*update_hpd)(struct dw_hdmi *hdmi, void *data,
> >                          bool force, bool disabled, bool rxsense);
> >       void (*setup_hpd)(struct dw_hdmi *hdmi, void *data);
> > +     void (*enable_audio)(struct dw_hdmi *hdmi, void *data, int channel,
> > +                          int width, int rate, int non_pcm);
> > +     void (*disable_audio)(struct dw_hdmi *hdmi, void *data);
> >   };
> >
> >   struct dw_hdmi_plat_data {
> > @@ -173,6 +176,8 @@ void dw_hdmi_setup_rx_sense(struct dw_hdmi
> *hdmi,
> > bool hpd, bool rx_sense);
> >
> >   int dw_hdmi_set_plugged_cb(struct dw_hdmi *hdmi,
> hdmi_codec_plugged_cb fn,
> >                          struct device *codec_dev);
> > +void dw_hdmi_set_sample_non_pcm(struct dw_hdmi *hdmi, unsigned int
> > +non_pcm); void dw_hdmi_set_sample_width(struct dw_hdmi *hdmi,
> > +unsigned int width);
> >   void dw_hdmi_set_sample_rate(struct dw_hdmi *hdmi, unsigned int
> rate);
> >   void dw_hdmi_set_channel_count(struct dw_hdmi *hdmi, unsigned int
> cnt);
> >   void dw_hdmi_set_channel_status(struct dw_hdmi *hdmi, u8
> > *channel_status);

RE: [EXT] Re: [PATCH v2 3/5] drm: bridge: dw_hdmi: Enable GCP only for Deep Color

[Sandor Yu]

> -----Original Message-----
> From: Neil Armstrong <narmstrong@baylibre.com>
> Sent: 2022年4月8日 20:40
> To: Sandor Yu <sandor.yu@nxp.com>; dri-devel@lists.freedesktop.org;
> linux-kernel@vger.kernel.org; andrzej.hajda@intel.com;
> robert.foss@linaro.org; Laurent.pinchart@ideasonboard.com;
> jonas@kwiboo.se; jernej.skrabec@gmail.com; hverkuil-cisco@xs4all.nl
> Cc: S.J. Wang <shengjiu.wang@nxp.com>; cai.huoqing@linux.dev;
> maxime@cerno.tech; harry.wentland@amd.com
> Subject: [EXT] Re: [PATCH v2 3/5] drm: bridge: dw_hdmi: Enable GCP only for
> Deep Color
> 
> Caution: EXT Email
> 
> On 08/04/2022 12:32, Sandor Yu wrote:
> > HDMI1.4b specification section 6.5.3:
> > Source shall only send GCPs with non-zero CD to sinks that indicate
> > support for Deep Color.
> >
> > DW HDMI GCP default enabled, clear gpc_auto bit for 24-bit color depth.
> 
> It's right because we do not handle AVMUTE, Pixel Packing nor
> Default_Phase.
> 
> >
> > Signed-off-by: Sandor Yu <Sandor.yu@nxp.com>
> > ---
> >   drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 12 ++++++++++++
> >   1 file changed, 12 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> > b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> > index 02d8f7e08814..5a7ec066e37a 100644
> > --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> > +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> > @@ -1108,6 +1108,8 @@ static void hdmi_video_packetize(struct
> dw_hdmi *hdmi)
> >       unsigned int output_select =
> HDMI_VP_CONF_OUTPUT_SELECTOR_PP;
> >       struct hdmi_data_info *hdmi_data = &hdmi->hdmi_data;
> >       u8 val, vp_conf;
> > +     u8 clear_gcp_auto = 0;
> > +
> >
> >       if (hdmi_bus_fmt_is_rgb(hdmi->hdmi_data.enc_out_bus_format) ||
> >
> hdmi_bus_fmt_is_yuv444(hdmi->hdmi_data.enc_out_bus_format)
> > || @@ -1117,6 +1119,7 @@ static void hdmi_video_packetize(struct
> dw_hdmi *hdmi)
> >               case 8:
> >                       color_depth = 4;
> >                       output_select =
> > HDMI_VP_CONF_OUTPUT_SELECTOR_BYPASS;
> > +                     clear_gcp_auto = 1;
> >                       break;
> >               case 10:
> >                       color_depth = 5; @@ -1136,6 +1139,7 @@
> static
> > void hdmi_video_packetize(struct dw_hdmi *hdmi)
> >               case 0:
> >               case 8:
> >                       remap_size =
> HDMI_VP_REMAP_YCC422_16bit;
> > +                     clear_gcp_auto = 1;
> >                       break;
> >               case 10:
> >                       remap_size = HDMI_VP_REMAP_YCC422_20bit;
> @@
> > -1160,6 +1164,14 @@ static void hdmi_video_packetize(struct dw_hdmi
> *hdmi)
> >               HDMI_VP_PR_CD_DESIRED_PR_FACTOR_MASK);
> >       hdmi_writeb(hdmi, val, HDMI_VP_PR_CD);
> >
> > +     val = hdmi_readb(hdmi, HDMI_FC_DATAUTO3);
> > +     if (clear_gcp_auto == 1)
> > +             /* disable Auto GCP when 24-bit color */
> 
> Maybe add a new define for HDMI_FC_DATAUTO3_GCP_AUTO bit and use it
> here.
OK, I will add it.
> 
> > +             val &= ~0x4;
> > +     else
> > +             val |= 0x4;
> > +     hdmi_writeb(hdmi, val, HDMI_FC_DATAUTO3);
> 
> Please also add a comment explaining we clear GCP because we only transmit
> CD and do not handle AVMUTE, PP nor Default_Phase (yet).
> 
OK.

Sandor
> > +
> >       hdmi_modb(hdmi,
> HDMI_VP_STUFF_PR_STUFFING_STUFFING_MODE,
> >                 HDMI_VP_STUFF_PR_STUFFING_MASK,
> HDMI_VP_STUFF);
> >
> 
> Thanks,
> Neil