RE: [PATCH 9/9] media: dwc: dw-hdmi-rx: Add support for CEC

From: Nelson Costa
Date: Wed Jun 02 2021 - 14:20:17 EST

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Hi Hans,

Thanks for your comments and feedback!

From: Hans Verkuil <hverkuil-cisco@xxxxxxxxx>
Date: qua, jun 02, 2021 at 13:45:45

> On 02/06/2021 13:24, Nelson Costa wrote:
> > This adds support for the optional HDMI CEC feature
> > for the Synopsys DesignWare HDMI RX Controller.
> >
> > It uses the generic CEC framework interface.
> >
> > Signed-off-by: Jose Abreu <jose.abreu@xxxxxxxxxxxx>
> > Signed-off-by: Nelson Costa <nelson.costa@xxxxxxxxxxxx>
> > ---
> > drivers/media/platform/dwc/Kconfig | 10 ++
> > drivers/media/platform/dwc/dw-hdmi-rx.c | 259 +++++++++++++++++++++++++++++++-
> > drivers/media/platform/dwc/dw-hdmi-rx.h | 57 +++++++
> > 3 files changed, 324 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/media/platform/dwc/Kconfig b/drivers/media/platform/dwc/Kconfig
> > index e915ca6..b487a92 100644
> > --- a/drivers/media/platform/dwc/Kconfig
> > +++ b/drivers/media/platform/dwc/Kconfig
> > @@ -11,3 +11,13 @@ config VIDEO_DWC_HDMI_RX
> >
> > To compile this driver as a module, choose M here. The module
> > will be called dw-hdmi-rx.
> > +
> > +config VIDEO_DWC_HDMI_RX_CEC
> > + bool "Synopsys DesignWare HDMI Receiver CEC support"
> > + depends on VIDEO_DWC_HDMI_RX
> > + select CEC_CORE
> > + help
> > + When selected the Synopsys DesignWare HDMI RX controller
> > + will support the optional HDMI CEC feature.
> > +
> > + It uses the generic CEC framework interface.
> > diff --git a/drivers/media/platform/dwc/dw-hdmi-rx.c b/drivers/media/platform/dwc/dw-hdmi-rx.c
> > index a468a93..5d6b1c0 100644
> > --- a/drivers/media/platform/dwc/dw-hdmi-rx.c
> > +++ b/drivers/media/platform/dwc/dw-hdmi-rx.c
> > @@ -21,6 +21,7 @@
> > #include <linux/workqueue.h>
> > #include <linux/rational.h>
> > #include <linux/hdmi.h>
> > +#include <media/cec.h>
> > #include <media/v4l2-async.h>
> > #include <media/v4l2-ctrls.h>
> > #include <media/v4l2-device.h>
> > @@ -36,6 +37,7 @@
> > #define DW_HDMI_JTAG_TAP_WRITE_CMD 1
> > #define DW_HDMI_JTAG_TAP_READ_CMD 3
> > #define DW_HDMI_AUDIO_FREQ_RANGE 1000
> > +#define DW_HDMI_CEC_MAX_LOG_ADDRS CEC_MAX_LOG_ADDRS
> >
> > /* EDID for HDMI RX */
> > static u32 dw_hdmi_edid[] = {
> > @@ -164,6 +166,9 @@ struct dw_hdmi_dev {
> > union hdmi_infoframe audioif;
> > union hdmi_infoframe vsif;
> >
> > + /* CEC */
> > + struct cec_adapter *cec_adap;
> > +
> > /* v4l2 device */
> > struct v4l2_subdev sd;
> > struct v4l2_ctrl_handler hdl;
> > @@ -365,6 +370,20 @@ static void dw_hdmi_reset(struct dw_hdmi_dev *dw_dev)
> > dw_hdmi_main_reset(dw_dev);
> >
> > dw_hdmi_disable_hpd(dw_dev);
> > +
> > + /* After a main reset try to re-enable the cec adapter in order to
> > + * reconfigure the required cec registers. For this the physical address
> > + * is invalidated and reconfigured, and with CEC_CAP_NEEDS_HPD allowing
> > + * to re-enable the adapter.
> > + */
> > + if (dw_dev->cec_adap) {
> > + u16 phys_addr = dw_dev->cec_adap->phys_addr;
> > +
> > + cec_phys_addr_invalidate(dw_dev->cec_adap);
> > + cec_s_phys_addr(dw_dev->cec_adap, phys_addr, false);
> > + dev_dbg(dw_dev->dev, "%s: re-enable cec adapter\n",
> > + __func__);
> > + }
> > }
> >
> > static inline bool is_off(struct dw_hdmi_dev *dw_dev)
> > @@ -1460,6 +1479,184 @@ static u32 dw_hdmi_get_int_val(struct dw_hdmi_dev *dw_dev, u32 ists, u32 ien)
> > return hdmi_readl(dw_dev, ists) & hdmi_readl(dw_dev, ien);
> > }
> >
> > +#if IS_ENABLED(CONFIG_VIDEO_DWC_HDMI_RX_CEC)
> > +static void dw_hdmi_cec_enable_ints(struct dw_hdmi_dev *dw_dev)
> > +{
> > + u32 mask = DW_HDMI_DONE_ISTS | DW_HDMI_EOM_ISTS |
> > + DW_HDMI_NACK_ISTS | DW_HDMI_ARBLST_ISTS |
> > + DW_HDMI_ERROR_INIT_ISTS | DW_HDMI_ERROR_FOLL_ISTS;
> > +
> > + hdmi_writel(dw_dev, mask, DW_HDMI_AUD_CEC_IEN_SET);
> > + hdmi_writel(dw_dev, 0x0, DW_HDMI_CEC_MASK);
> > +}
> > +
> > +static void dw_hdmi_cec_disable_ints(struct dw_hdmi_dev *dw_dev)
> > +{
> > + hdmi_writel(dw_dev, ~0x0, DW_HDMI_AUD_CEC_IEN_CLR);
> > + hdmi_writel(dw_dev, ~0x0, DW_HDMI_CEC_MASK);
> > +}
> > +
> > +static void dw_hdmi_cec_clear_ints(struct dw_hdmi_dev *dw_dev)
> > +{
> > + hdmi_writel(dw_dev, ~0x0, DW_HDMI_AUD_CEC_ICLR);
> > +}
> > +
> > +static void dw_hdmi_cec_tx_raw_status(struct dw_hdmi_dev *dw_dev, u32 stat)
> > +{
> > + if (hdmi_readl(dw_dev, DW_HDMI_CEC_CTRL) & DW_HDMI_SEND_MASK) {
> > + dev_dbg(dw_dev->dev, "%s: tx is busy\n", __func__);
> > + return;
> > + }
> > +
> > + if (stat & DW_HDMI_ARBLST_ISTS) {
> > + cec_transmit_attempt_done(dw_dev->cec_adap,
> > + CEC_TX_STATUS_ARB_LOST);
> > + return;
> > + }
> > +
> > + if (stat & DW_HDMI_NACK_ISTS) {
> > + cec_transmit_attempt_done(dw_dev->cec_adap, CEC_TX_STATUS_NACK);
> > + return;
> > + }
> > +
> > + if (stat & DW_HDMI_ERROR_INIT_ISTS) {
> > + dev_dbg(dw_dev->dev, "%s: got low drive error\n", __func__);
> > + cec_transmit_attempt_done(dw_dev->cec_adap,
> > + CEC_TX_STATUS_LOW_DRIVE);
> > + return;
> > + }
> > +
> > + if (stat & DW_HDMI_DONE_ISTS) {
> > + cec_transmit_attempt_done(dw_dev->cec_adap, CEC_TX_STATUS_OK);
> > + return;
> > + }
> > +}
> > +
> > +static void dw_hdmi_cec_received_msg(struct dw_hdmi_dev *dw_dev)
> > +{
> > + struct cec_msg msg;
> > + u8 i;
> > +
> > + msg.len = hdmi_readl(dw_dev, DW_HDMI_CEC_RX_CNT);
> > + if (!msg.len || msg.len > DW_HDMI_CEC_RX_DATA_MAX)
> > + return; /* it's an invalid/non-existent message */
> > +
> > + for (i = 0; i < msg.len; i++)
> > + msg.msg[i] = hdmi_readl(dw_dev, DW_HDMI_CEC_RX_DATA(i));
> > +
> > + hdmi_writel(dw_dev, 0x0, DW_HDMI_CEC_LOCK);
> > + cec_received_msg(dw_dev->cec_adap, &msg);
> > +}
> > +
> > +static int dw_hdmi_cec_adap_enable(struct cec_adapter *adap, bool enable)
> > +{
> > + struct dw_hdmi_dev *dw_dev = cec_get_drvdata(adap);
> > +
> > + dev_dbg(dw_dev->dev, "%s: enable=%d\n", __func__, enable);
> > +
> > + hdmi_writel(dw_dev, 0x0, DW_HDMI_CEC_ADDR_L);
> > + hdmi_writel(dw_dev, 0x0, DW_HDMI_CEC_ADDR_H);
> > +
> > + if (enable) {
> > + hdmi_writel(dw_dev, 0x0, DW_HDMI_CEC_LOCK);
> > + dw_hdmi_cec_clear_ints(dw_dev);
> > + dw_hdmi_cec_enable_ints(dw_dev);
> > + } else {
> > + dw_hdmi_cec_disable_ints(dw_dev);
> > + dw_hdmi_cec_clear_ints(dw_dev);
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +static int dw_hdmi_cec_adap_log_addr(struct cec_adapter *adap, u8 addr)
> > +{
> > + struct dw_hdmi_dev *dw_dev = cec_get_drvdata(adap);
> > + u32 tmp;
> > +
> > + dev_dbg(dw_dev->dev, "%s: addr=%d\n", __func__, addr);
> > +
> > + if (addr == CEC_LOG_ADDR_INVALID) {
> > + hdmi_writel(dw_dev, 0x0, DW_HDMI_CEC_ADDR_L);
> > + hdmi_writel(dw_dev, 0x0, DW_HDMI_CEC_ADDR_H);
> > + return 0;
> > + }
> > +
> > + if (addr >= 8) {
> > + tmp = hdmi_readl(dw_dev, DW_HDMI_CEC_ADDR_H);
> > + tmp |= BIT(addr - 8);
> > + hdmi_writel(dw_dev, tmp, DW_HDMI_CEC_ADDR_H);
> > + } else {
> > + tmp = hdmi_readl(dw_dev, DW_HDMI_CEC_ADDR_L);
> > + tmp |= BIT(addr);
> > + hdmi_writel(dw_dev, tmp, DW_HDMI_CEC_ADDR_L);
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +static int dw_hdmi_cec_adap_transmit(struct cec_adapter *adap, u8 attempts,
> > + u32 signal_free_time, struct cec_msg *msg)
> > +{
> > + struct dw_hdmi_dev *dw_dev = cec_get_drvdata(adap);
> > + u8 len = msg->len;
> > + u32 reg;
> > + u8 i;
> > +
> > + dev_dbg(dw_dev->dev, "%s: len=%d\n", __func__, len);
> > +
> > + if (hdmi_readl(dw_dev, DW_HDMI_CEC_CTRL) & DW_HDMI_SEND_MASK) {
> > + dev_err(dw_dev->dev, "%s: tx is busy\n", __func__);
> > + return -EBUSY;
> > + }
> > +
> > + for (i = 0; i < len; i++)
> > + hdmi_writel(dw_dev, msg->msg[i], DW_HDMI_CEC_TX_DATA(i));
> > +
> > + switch (signal_free_time) {
> > + case CEC_SIGNAL_FREE_TIME_RETRY:
> > + reg = 0x0;
> > + break;
> > + case CEC_SIGNAL_FREE_TIME_NEXT_XFER:
> > + reg = 0x2;
> > + break;
> > + case CEC_SIGNAL_FREE_TIME_NEW_INITIATOR:
> > + default:
> > + reg = 0x1;
> > + break;
> > + }
> > +
> > + hdmi_writel(dw_dev, len, DW_HDMI_CEC_TX_CNT);
> > + hdmi_mask_writel(dw_dev, reg, DW_HDMI_CEC_CTRL,
> > + DW_HDMI_FRAME_TYP_OFFSET,
> > + DW_HDMI_FRAME_TYP_MASK);
> > + hdmi_mask_writel(dw_dev, 0x1, DW_HDMI_CEC_CTRL,
> > + DW_HDMI_SEND_OFFSET,
> > + DW_HDMI_SEND_MASK);
> > + return 0;
> > +}
> > +
> > +static const struct cec_adap_ops dw_hdmi_cec_adap_ops = {
> > + .adap_enable = dw_hdmi_cec_adap_enable,
> > + .adap_log_addr = dw_hdmi_cec_adap_log_addr,
> > + .adap_transmit = dw_hdmi_cec_adap_transmit,
> > +};
> > +
> > +static void dw_hdmi_cec_irq_handler(struct dw_hdmi_dev *dw_dev)
> > +{
> > + u32 cec_ists = dw_hdmi_get_int_val(dw_dev, DW_HDMI_AUD_CEC_ISTS,
> > + DW_HDMI_AUD_CEC_IEN);
> > +
> > + dw_hdmi_cec_clear_ints(dw_dev);
> > +
> > + if (cec_ists) {
> > + dw_hdmi_cec_tx_raw_status(dw_dev, cec_ists);
> > + if (cec_ists & DW_HDMI_EOM_ISTS)
> > + dw_hdmi_cec_received_msg(dw_dev);
> > + }
> > +}
> > +#endif /* CONFIG_VIDEO_DWC_HDMI_RX_CEC */
> > +
> > static u8 dw_hdmi_get_curr_vic(struct dw_hdmi_dev *dw_dev, bool *is_hdmi_vic)
> > {
> > u8 vic = hdmi_mask_readl(dw_dev, DW_HDMI_PDEC_AVI_PB,
> > @@ -2058,6 +2255,10 @@ static irqreturn_t dw_hdmi_irq_handler(int irq, void *dev_data)
> > }
> > }
> >
> > +#if IS_ENABLED(CONFIG_VIDEO_DWC_HDMI_RX_CEC)
> > + dw_hdmi_cec_irq_handler(dw_dev);
> > +#endif /* CONFIG_VIDEO_DWC_HDMI_RX_CEC */
> > +
> > return IRQ_HANDLED;
> > }
> >
> > @@ -2556,14 +2757,27 @@ static int dw_hdmi_set_edid(struct v4l2_subdev *sd, struct v4l2_edid *edid)
> > struct dw_hdmi_dev *dw_dev = to_dw_dev(sd);
> > int input_count = dw_dev->config->phy->input_count;
> > int size, ret;
> > + u16 phys_addr;
> > u32 *tmp;
> >
> > memset(edid->reserved, 0, sizeof(edid->reserved));
> >
> > - if (edid->pad >= input_count || !edid->edid || !edid->blocks)
> > + if (edid->pad >= input_count || !edid->edid)
> > return -EINVAL;
> > if (edid->start_block != 0)
> > return -EINVAL;
> > + if (!edid->blocks) {
> > + phys_addr = CEC_PHYS_ADDR_INVALID;
> > + goto set_phys_addr;
> > + }
> > +
> > + /* get the source physical address (PA) from edid */
> > + phys_addr = cec_get_edid_phys_addr(edid->edid, edid->blocks * 128,
> > + NULL);
> > + /* get the own physical address getting the parent of Source PA */
> > + ret = v4l2_phys_addr_validate(phys_addr, &phys_addr, NULL);
> > + if (ret)
> > + return ret;
>
> Something I should have asked in my review for 6/9: if there are
> multiple inputs, does each input have its own EDID area?
>

Yes, there is one EDID area for each input port.

> If there are multiple inputs, are the CEC lines of each input part
> of the same CEC bus? This is typically the case for e.g. TVs, and as
> far as I can see it's the case for this receiver driver as well.
>

Yes.

> >
> > /* Clear old EDID */
> > size = dw_dev->curr_edid_blocks[edid->pad] * 128;
> > @@ -2592,7 +2806,9 @@ static int dw_hdmi_set_edid(struct v4l2_subdev *sd, struct v4l2_edid *edid)
> > if (ret)
> > return ret;
> >
> > +set_phys_addr:
> > dw_dev->curr_edid_blocks[edid->pad] = edid->blocks;
> > + cec_s_phys_addr(dw_dev->cec_adap, phys_addr, false);
> > return 0;
> > }
> >
> > @@ -2825,15 +3041,33 @@ static int dw_hdmi_subscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh,
> > static int dw_hdmi_registered(struct v4l2_subdev *sd)
> > {
> > struct dw_hdmi_dev *dw_dev = to_dw_dev(sd);
> > + int ret;
> > +
> > + ret = cec_register_adapter(dw_dev->cec_adap, dw_dev->dev);
> > + if (ret) {
> > + dev_err(dw_dev->dev, "failed to register CEC adapter\n");
> > + goto err_adapter;
> > + }
> > + cec_s_phys_addr(dw_dev->cec_adap, 0, false);
>
> This isn't right. When you set the EDID you will also set the physical
> address, you don't do that when registering the CEC adapter, there is no
> physical address yet.
>

As in the patch [6/9] we had the default edid "dw_hdmi_edid", that was
being loaded in the driver probe, we also initialized the cec physical
address "0" accordingly with the default edid.

But following your comments in patch [6/9], the default edid must be
removed and so this initial cec physical address "0" will be removed
accordingly also as you are asking :).

> > + if (dw_dev->cec_adap)
> > + dev_info(dw_dev->dev,
> > + "CEC adapter %s registered for HDMI input\n",
> > + dev_name(&dw_dev->cec_adap->devnode.dev));
> >
> > dw_dev->registered = true;
> > return 0;
> > +
> > +err_adapter:
> > + cec_delete_adapter(dw_dev->cec_adap);
> > + return ret;
> > }
> >
> > static void dw_hdmi_unregistered(struct v4l2_subdev *sd)
> > {
> > struct dw_hdmi_dev *dw_dev = to_dw_dev(sd);
> >
> > + cec_unregister_adapter(dw_dev->cec_adap);
> > +
> > dw_dev->registered = false;
> > }
> >
> > @@ -3194,10 +3428,29 @@ static int dw_hdmi_rx_probe(struct platform_device *pdev)
> > if (ret)
> > goto err_phy_exit;
> >
> > + /* CEC */
> > +#if IS_ENABLED(CONFIG_VIDEO_DWC_HDMI_RX_CEC)
> > + dw_dev->cec_adap = cec_allocate_adapter(&dw_hdmi_cec_adap_ops,
> > + dw_dev, dev_name(dev),
> > + (CEC_CAP_DEFAULTS |
> > + CEC_CAP_NEEDS_HPD |
>
> This cap makes no sense for a receiver.
>

This cap was added in order to overcome a scenario that we have when
there
was an hot plug. The driver performs a main reset that cause the loss of
cec controller configuration. And in that case in order to reconfigure
the
cec this cap was added. Because whenever there is a reset the physical
address is reconfigured (invalidated and set) and with this cap the cec
configuration callback function (adap_enable) is called again allowing to
reconfigure the cec.

Does it make sense?

If not, what should be the best approach in order to deal with this
scenario?

> > + CEC_CAP_CONNECTOR_INFO),
>
> This cap also should be removed: connector info is not (yet) supported
> for receivers, only for transmitters.
>

I agree! Will be addressed in the next patch series.

Thanks a lot,

BR,

Nelson Costa

> Regards,
>
> Hans
>
> > + DW_HDMI_CEC_MAX_LOG_ADDRS);
> > + ret = PTR_ERR_OR_ZERO(dw_dev->cec_adap);
> > + if (ret) {
> > + dev_err(dev, "failed to allocate CEC adapter\n");
> > + goto err_cec;
> > + }
> > +
> > + dev_info(dev, "CEC is enabled\n");
> > +#else
> > + dev_info(dev, "CEC is disabled\n");
> > +#endif /* CONFIG_VIDEO_DWC_HDMI_RX_CEC */
> > +
> > ret = v4l2_async_register_subdev(sd);
> > if (ret) {
> > dev_err(dev, "failed to register subdev\n");
> > - goto err_phy_exit;
> > + goto err_cec;
> > }
> >
> > /* Fill initial format settings */
> > @@ -3230,6 +3483,8 @@ static int dw_hdmi_rx_probe(struct platform_device *pdev)
> >
> > err_subdev:
> > v4l2_async_unregister_subdev(sd);
> > +err_cec:
> > + cec_delete_adapter(dw_dev->cec_adap);
> > err_phy_exit:
> > dw_hdmi_phy_exit(dw_dev);
> > err_hdl:
> > diff --git a/drivers/media/platform/dwc/dw-hdmi-rx.h b/drivers/media/platform/dwc/dw-hdmi-rx.h
> > index f0ea1d4..775b7a9 100644
> > --- a/drivers/media/platform/dwc/dw-hdmi-rx.h
> > +++ b/drivers/media/platform/dwc/dw-hdmi-rx.h
> > @@ -325,6 +325,25 @@
> >
> > #define DW_HDMI_HDCP22_STATUS 0x08fc
> >
> > +/* id_audio_and_cec_interrupt Registers */
> > +#define DW_HDMI_AUD_CEC_IEN_CLR 0x0f90
> > +#define DW_HDMI_AUD_CEC_IEN_SET 0x0f94
> > +
> > +#define DW_HDMI_AUD_CEC_ISTS 0x0f98
> > +#define DW_HDMI_WAKEUPCTRL_ISTS BIT(22)
> > +#define DW_HDMI_ERROR_FOLL_ISTS BIT(21)
> > +#define DW_HDMI_ERROR_INIT_ISTS BIT(20)
> > +#define DW_HDMI_ARBLST_ISTS BIT(19)
> > +#define DW_HDMI_NACK_ISTS BIT(18)
> > +#define DW_HDMI_EOM_ISTS BIT(17)
> > +#define DW_HDMI_DONE_ISTS BIT(16)
> > +#define DW_HDMI_SCK_STABLE_ISTS BIT(1)
> > +#define DW_HDMI_CTSN_CNT_ISTS BIT(0)
> > +
> > +#define DW_HDMI_AUD_CEC_IEN 0x0f9c
> > +#define DW_HDMI_AUD_CEC_ICLR 0x0fa0
> > +#define DW_HDMI_AUD_CEC_ISET 0x0fa4
> > +
> > /* id_mode_detection_interrupt Registers */
> > #define DW_HDMI_MD_IEN_CLR 0x0fc0
> > #define DW_HDMI_MD_IEN_SET 0x0fc4
> > @@ -426,6 +445,44 @@
> > #define DW_HDMI_HDMI_ENABLE_MASK BIT(2)
> > #define DW_HDMI_HDMI_ENABLE_OFFSET 2
> >
> > +/* id_cec Registers */
> > +#define DW_HDMI_CEC_CTRL 0x1f00
> > +#define DW_HDMI_STANDBY_MASK BIT(4)
> > +#define DW_HDMI_STANDBY_OFFSET 4
> > +#define DW_HDMI_BC_NACK_MASK BIT(3)
> > +#define DW_HDMI_BC_NACK_OFFSET 3
> > +#define DW_HDMI_FRAME_TYP_MASK GENMASK(2, 1)
> > +#define DW_HDMI_FRAME_TYP_OFFSET 1
> > +#define DW_HDMI_SEND_MASK BIT(0)
> > +#define DW_HDMI_SEND_OFFSET 0
> > +
> > +#define DW_HDMI_CEC_MASK 0x1f08
> > +#define DW_HDMI_WAKEUP_MASK BIT(6)
> > +#define DW_HDMI_WAKEUP_OFFSET 6
> > +#define DW_HDMI_ERROR_FLOW_MASK BIT(5)
> > +#define DW_HDMI_ERROR_FLOW_OFFSET 5
> > +#define DW_HDMI_ERROR_INITITATOR_MASK BIT(4)
> > +#define DW_HDMI_ERROR_INITITATOR_OFFSET 4
> > +#define DW_HDMI_ARB_LOST_MASK BIT(3)
> > +#define DW_HDMI_ARB_LOST_OFFSET 3
> > +#define DW_HDMI_NACK_MASK BIT(2)
> > +#define DW_HDMI_NACK_OFFSET 2
> > +#define DW_HDMI_EOM_MASK BIT(1)
> > +#define DW_HDMI_EOM_OFFSET 1
> > +#define DW_HDMI_DONE_MASK BIT(0)
> > +#define DW_HDMI_DONE_OFFSET 0
> > +
> > +#define DW_HDMI_CEC_ADDR_L 0x1f14
> > +#define DW_HDMI_CEC_ADDR_H 0x1f18
> > +#define DW_HDMI_CEC_TX_CNT 0x1f1c
> > +#define DW_HDMI_CEC_RX_CNT 0x1f20
> > +#define DW_HDMI_CEC_TX_DATA(i) (0x1f40 + ((i) * 4))
> > +#define DW_HDMI_CEC_TX_DATA_MAX 16
> > +#define DW_HDMI_CEC_RX_DATA(i) (0x1f80 + ((i) * 4))
> > +#define DW_HDMI_CEC_RX_DATA_MAX 16
> > +#define DW_HDMI_CEC_LOCK 0x1fc0
> > +#define DW_HDMI_CEC_WAKEUPCTRL 0x1fc4
> > +
> > /* id_cbus Registers */
> > #define DW_HDMI_CBUSIOCTRL 0x3020
> > #define DW_HDMI_DATAPATH_CBUSZ_MASK BIT(24)
> >

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