forked from luck/tmp_suning_uos_patched
drm: add support for DisplayPort CEC-Tunneling-over-AUX
This adds support for the DisplayPort CEC-Tunneling-over-AUX feature that is part of the DisplayPort 1.3 standard. Unfortunately, not all DisplayPort/USB-C to HDMI adapters with a chip that has this capability actually hook up the CEC pin, so even though a CEC device is created, it may not actually work. Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180711132909.25409-2-hverkuil@xs4all.nl
This commit is contained in:
parent
cf19fa2cfa
commit
2c6d1fffa1
|
@ -122,6 +122,16 @@ config DRM_LOAD_EDID_FIRMWARE
|
|||
default case is N. Details and instructions how to build your own
|
||||
EDID data are given in Documentation/EDID/HOWTO.txt.
|
||||
|
||||
config DRM_DP_CEC
|
||||
bool "Enable DisplayPort CEC-Tunneling-over-AUX HDMI support"
|
||||
select CEC_CORE
|
||||
help
|
||||
Choose this option if you want to enable HDMI CEC support for
|
||||
DisplayPort/USB-C to HDMI adapters.
|
||||
|
||||
Note: not all adapters support this feature, and even for those
|
||||
that do support this they often do not hook up the CEC pin.
|
||||
|
||||
config DRM_TTM
|
||||
tristate
|
||||
depends on DRM && MMU
|
||||
|
|
|
@ -41,6 +41,7 @@ drm_kms_helper-$(CONFIG_DRM_PANEL_BRIDGE) += bridge/panel.o
|
|||
drm_kms_helper-$(CONFIG_DRM_FBDEV_EMULATION) += drm_fb_helper.o
|
||||
drm_kms_helper-$(CONFIG_DRM_KMS_CMA_HELPER) += drm_fb_cma_helper.o
|
||||
drm_kms_helper-$(CONFIG_DRM_DP_AUX_CHARDEV) += drm_dp_aux_dev.o
|
||||
drm_kms_helper-$(CONFIG_DRM_DP_CEC) += drm_dp_cec.o
|
||||
|
||||
obj-$(CONFIG_DRM_KMS_HELPER) += drm_kms_helper.o
|
||||
obj-$(CONFIG_DRM_DEBUG_SELFTEST) += selftests/
|
||||
|
|
428
drivers/gpu/drm/drm_dp_cec.c
Normal file
428
drivers/gpu/drm/drm_dp_cec.c
Normal file
|
@ -0,0 +1,428 @@
|
|||
// SPDX-License-Identifier: GPL-2.0
|
||||
/*
|
||||
* DisplayPort CEC-Tunneling-over-AUX support
|
||||
*
|
||||
* Copyright 2018 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
|
||||
*/
|
||||
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/slab.h>
|
||||
#include <drm/drm_dp_helper.h>
|
||||
#include <media/cec.h>
|
||||
|
||||
/*
|
||||
* Unfortunately it turns out that we have a chicken-and-egg situation
|
||||
* here. Quite a few active (mini-)DP-to-HDMI or USB-C-to-HDMI adapters
|
||||
* have a converter chip that supports CEC-Tunneling-over-AUX (usually the
|
||||
* Parade PS176), but they do not wire up the CEC pin, thus making CEC
|
||||
* useless.
|
||||
*
|
||||
* Sadly there is no way for this driver to know this. What happens is
|
||||
* that a /dev/cecX device is created that is isolated and unable to see
|
||||
* any of the other CEC devices. Quite literally the CEC wire is cut
|
||||
* (or in this case, never connected in the first place).
|
||||
*
|
||||
* The reason so few adapters support this is that this tunneling protocol
|
||||
* was never supported by any OS. So there was no easy way of testing it,
|
||||
* and no incentive to correctly wire up the CEC pin.
|
||||
*
|
||||
* Hopefully by creating this driver it will be easier for vendors to
|
||||
* finally fix their adapters and test the CEC functionality.
|
||||
*
|
||||
* I keep a list of known working adapters here:
|
||||
*
|
||||
* https://hverkuil.home.xs4all.nl/cec-status.txt
|
||||
*
|
||||
* Please mail me (hverkuil@xs4all.nl) if you find an adapter that works
|
||||
* and is not yet listed there.
|
||||
*
|
||||
* Note that the current implementation does not support CEC over an MST hub.
|
||||
* As far as I can see there is no mechanism defined in the DisplayPort
|
||||
* standard to transport CEC interrupts over an MST device. It might be
|
||||
* possible to do this through polling, but I have not been able to get that
|
||||
* to work.
|
||||
*/
|
||||
|
||||
/**
|
||||
* DOC: dp cec helpers
|
||||
*
|
||||
* These functions take care of supporting the CEC-Tunneling-over-AUX
|
||||
* feature of DisplayPort-to-HDMI adapters.
|
||||
*/
|
||||
|
||||
/*
|
||||
* When the EDID is unset because the HPD went low, then the CEC DPCD registers
|
||||
* typically can no longer be read (true for a DP-to-HDMI adapter since it is
|
||||
* powered by the HPD). However, some displays toggle the HPD off and on for a
|
||||
* short period for one reason or another, and that would cause the CEC adapter
|
||||
* to be removed and added again, even though nothing else changed.
|
||||
*
|
||||
* This module parameter sets a delay in seconds before the CEC adapter is
|
||||
* actually unregistered. Only if the HPD does not return within that time will
|
||||
* the CEC adapter be unregistered.
|
||||
*
|
||||
* If it is set to a value >= NEVER_UNREG_DELAY, then the CEC adapter will never
|
||||
* be unregistered for as long as the connector remains registered.
|
||||
*
|
||||
* If it is set to 0, then the CEC adapter will be unregistered immediately as
|
||||
* soon as the HPD disappears.
|
||||
*
|
||||
* The default is one second to prevent short HPD glitches from unregistering
|
||||
* the CEC adapter.
|
||||
*
|
||||
* Note that for integrated HDMI branch devices that support CEC the DPCD
|
||||
* registers remain available even if the HPD goes low since it is not powered
|
||||
* by the HPD. In that case the CEC adapter will never be unregistered during
|
||||
* the life time of the connector. At least, this is the theory since I do not
|
||||
* have hardware with an integrated HDMI branch device that supports CEC.
|
||||
*/
|
||||
#define NEVER_UNREG_DELAY 1000
|
||||
static unsigned int drm_dp_cec_unregister_delay = 1;
|
||||
module_param(drm_dp_cec_unregister_delay, uint, 0600);
|
||||
MODULE_PARM_DESC(drm_dp_cec_unregister_delay,
|
||||
"CEC unregister delay in seconds, 0: no delay, >= 1000: never unregister");
|
||||
|
||||
static int drm_dp_cec_adap_enable(struct cec_adapter *adap, bool enable)
|
||||
{
|
||||
struct drm_dp_aux *aux = cec_get_drvdata(adap);
|
||||
u32 val = enable ? DP_CEC_TUNNELING_ENABLE : 0;
|
||||
ssize_t err = 0;
|
||||
|
||||
err = drm_dp_dpcd_writeb(aux, DP_CEC_TUNNELING_CONTROL, val);
|
||||
return (enable && err < 0) ? err : 0;
|
||||
}
|
||||
|
||||
static int drm_dp_cec_adap_log_addr(struct cec_adapter *adap, u8 addr)
|
||||
{
|
||||
struct drm_dp_aux *aux = cec_get_drvdata(adap);
|
||||
/* Bit 15 (logical address 15) should always be set */
|
||||
u16 la_mask = 1 << CEC_LOG_ADDR_BROADCAST;
|
||||
u8 mask[2];
|
||||
ssize_t err;
|
||||
|
||||
if (addr != CEC_LOG_ADDR_INVALID)
|
||||
la_mask |= adap->log_addrs.log_addr_mask | (1 << addr);
|
||||
mask[0] = la_mask & 0xff;
|
||||
mask[1] = la_mask >> 8;
|
||||
err = drm_dp_dpcd_write(aux, DP_CEC_LOGICAL_ADDRESS_MASK, mask, 2);
|
||||
return (addr != CEC_LOG_ADDR_INVALID && err < 0) ? err : 0;
|
||||
}
|
||||
|
||||
static int drm_dp_cec_adap_transmit(struct cec_adapter *adap, u8 attempts,
|
||||
u32 signal_free_time, struct cec_msg *msg)
|
||||
{
|
||||
struct drm_dp_aux *aux = cec_get_drvdata(adap);
|
||||
unsigned int retries = min(5, attempts - 1);
|
||||
ssize_t err;
|
||||
|
||||
err = drm_dp_dpcd_write(aux, DP_CEC_TX_MESSAGE_BUFFER,
|
||||
msg->msg, msg->len);
|
||||
if (err < 0)
|
||||
return err;
|
||||
|
||||
err = drm_dp_dpcd_writeb(aux, DP_CEC_TX_MESSAGE_INFO,
|
||||
(msg->len - 1) | (retries << 4) |
|
||||
DP_CEC_TX_MESSAGE_SEND);
|
||||
return err < 0 ? err : 0;
|
||||
}
|
||||
|
||||
static int drm_dp_cec_adap_monitor_all_enable(struct cec_adapter *adap,
|
||||
bool enable)
|
||||
{
|
||||
struct drm_dp_aux *aux = cec_get_drvdata(adap);
|
||||
ssize_t err;
|
||||
u8 val;
|
||||
|
||||
if (!(adap->capabilities & CEC_CAP_MONITOR_ALL))
|
||||
return 0;
|
||||
|
||||
err = drm_dp_dpcd_readb(aux, DP_CEC_TUNNELING_CONTROL, &val);
|
||||
if (err >= 0) {
|
||||
if (enable)
|
||||
val |= DP_CEC_SNOOPING_ENABLE;
|
||||
else
|
||||
val &= ~DP_CEC_SNOOPING_ENABLE;
|
||||
err = drm_dp_dpcd_writeb(aux, DP_CEC_TUNNELING_CONTROL, val);
|
||||
}
|
||||
return (enable && err < 0) ? err : 0;
|
||||
}
|
||||
|
||||
static void drm_dp_cec_adap_status(struct cec_adapter *adap,
|
||||
struct seq_file *file)
|
||||
{
|
||||
struct drm_dp_aux *aux = cec_get_drvdata(adap);
|
||||
struct drm_dp_desc desc;
|
||||
struct drm_dp_dpcd_ident *id = &desc.ident;
|
||||
|
||||
if (drm_dp_read_desc(aux, &desc, true))
|
||||
return;
|
||||
seq_printf(file, "OUI: %*pdH\n",
|
||||
(int)sizeof(id->oui), id->oui);
|
||||
seq_printf(file, "ID: %*pE\n",
|
||||
(int)strnlen(id->device_id, sizeof(id->device_id)),
|
||||
id->device_id);
|
||||
seq_printf(file, "HW Rev: %d.%d\n", id->hw_rev >> 4, id->hw_rev & 0xf);
|
||||
/*
|
||||
* Show this both in decimal and hex: at least one vendor
|
||||
* always reports this in hex.
|
||||
*/
|
||||
seq_printf(file, "FW/SW Rev: %d.%d (0x%02x.0x%02x)\n",
|
||||
id->sw_major_rev, id->sw_minor_rev,
|
||||
id->sw_major_rev, id->sw_minor_rev);
|
||||
}
|
||||
|
||||
static const struct cec_adap_ops drm_dp_cec_adap_ops = {
|
||||
.adap_enable = drm_dp_cec_adap_enable,
|
||||
.adap_log_addr = drm_dp_cec_adap_log_addr,
|
||||
.adap_transmit = drm_dp_cec_adap_transmit,
|
||||
.adap_monitor_all_enable = drm_dp_cec_adap_monitor_all_enable,
|
||||
.adap_status = drm_dp_cec_adap_status,
|
||||
};
|
||||
|
||||
static int drm_dp_cec_received(struct drm_dp_aux *aux)
|
||||
{
|
||||
struct cec_adapter *adap = aux->cec.adap;
|
||||
struct cec_msg msg;
|
||||
u8 rx_msg_info;
|
||||
ssize_t err;
|
||||
|
||||
err = drm_dp_dpcd_readb(aux, DP_CEC_RX_MESSAGE_INFO, &rx_msg_info);
|
||||
if (err < 0)
|
||||
return err;
|
||||
|
||||
if (!(rx_msg_info & DP_CEC_RX_MESSAGE_ENDED))
|
||||
return 0;
|
||||
|
||||
msg.len = (rx_msg_info & DP_CEC_RX_MESSAGE_LEN_MASK) + 1;
|
||||
err = drm_dp_dpcd_read(aux, DP_CEC_RX_MESSAGE_BUFFER, msg.msg, msg.len);
|
||||
if (err < 0)
|
||||
return err;
|
||||
|
||||
cec_received_msg(adap, &msg);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void drm_dp_cec_handle_irq(struct drm_dp_aux *aux)
|
||||
{
|
||||
struct cec_adapter *adap = aux->cec.adap;
|
||||
u8 flags;
|
||||
|
||||
if (drm_dp_dpcd_readb(aux, DP_CEC_TUNNELING_IRQ_FLAGS, &flags) < 0)
|
||||
return;
|
||||
|
||||
if (flags & DP_CEC_RX_MESSAGE_INFO_VALID)
|
||||
drm_dp_cec_received(aux);
|
||||
|
||||
if (flags & DP_CEC_TX_MESSAGE_SENT)
|
||||
cec_transmit_attempt_done(adap, CEC_TX_STATUS_OK);
|
||||
else if (flags & DP_CEC_TX_LINE_ERROR)
|
||||
cec_transmit_attempt_done(adap, CEC_TX_STATUS_ERROR |
|
||||
CEC_TX_STATUS_MAX_RETRIES);
|
||||
else if (flags &
|
||||
(DP_CEC_TX_ADDRESS_NACK_ERROR | DP_CEC_TX_DATA_NACK_ERROR))
|
||||
cec_transmit_attempt_done(adap, CEC_TX_STATUS_NACK |
|
||||
CEC_TX_STATUS_MAX_RETRIES);
|
||||
drm_dp_dpcd_writeb(aux, DP_CEC_TUNNELING_IRQ_FLAGS, flags);
|
||||
}
|
||||
|
||||
/**
|
||||
* drm_dp_cec_irq() - handle CEC interrupt, if any
|
||||
* @aux: DisplayPort AUX channel
|
||||
*
|
||||
* Should be called when handling an IRQ_HPD request. If CEC-tunneling-over-AUX
|
||||
* is present, then it will check for a CEC_IRQ and handle it accordingly.
|
||||
*/
|
||||
void drm_dp_cec_irq(struct drm_dp_aux *aux)
|
||||
{
|
||||
u8 cec_irq;
|
||||
int ret;
|
||||
|
||||
mutex_lock(&aux->cec.lock);
|
||||
if (!aux->cec.adap)
|
||||
goto unlock;
|
||||
|
||||
ret = drm_dp_dpcd_readb(aux, DP_DEVICE_SERVICE_IRQ_VECTOR_ESI1,
|
||||
&cec_irq);
|
||||
if (ret < 0 || !(cec_irq & DP_CEC_IRQ))
|
||||
goto unlock;
|
||||
|
||||
drm_dp_cec_handle_irq(aux);
|
||||
drm_dp_dpcd_writeb(aux, DP_DEVICE_SERVICE_IRQ_VECTOR_ESI1, DP_CEC_IRQ);
|
||||
unlock:
|
||||
mutex_unlock(&aux->cec.lock);
|
||||
}
|
||||
EXPORT_SYMBOL(drm_dp_cec_irq);
|
||||
|
||||
static bool drm_dp_cec_cap(struct drm_dp_aux *aux, u8 *cec_cap)
|
||||
{
|
||||
u8 cap = 0;
|
||||
|
||||
if (drm_dp_dpcd_readb(aux, DP_CEC_TUNNELING_CAPABILITY, &cap) != 1 ||
|
||||
!(cap & DP_CEC_TUNNELING_CAPABLE))
|
||||
return false;
|
||||
if (cec_cap)
|
||||
*cec_cap = cap;
|
||||
return true;
|
||||
}
|
||||
|
||||
/*
|
||||
* Called if the HPD was low for more than drm_dp_cec_unregister_delay
|
||||
* seconds. This unregisters the CEC adapter.
|
||||
*/
|
||||
static void drm_dp_cec_unregister_work(struct work_struct *work)
|
||||
{
|
||||
struct drm_dp_aux *aux = container_of(work, struct drm_dp_aux,
|
||||
cec.unregister_work.work);
|
||||
|
||||
mutex_lock(&aux->cec.lock);
|
||||
cec_unregister_adapter(aux->cec.adap);
|
||||
aux->cec.adap = NULL;
|
||||
mutex_unlock(&aux->cec.lock);
|
||||
}
|
||||
|
||||
/*
|
||||
* A new EDID is set. If there is no CEC adapter, then create one. If
|
||||
* there was a CEC adapter, then check if the CEC adapter properties
|
||||
* were unchanged and just update the CEC physical address. Otherwise
|
||||
* unregister the old CEC adapter and create a new one.
|
||||
*/
|
||||
void drm_dp_cec_set_edid(struct drm_dp_aux *aux, const struct edid *edid)
|
||||
{
|
||||
u32 cec_caps = CEC_CAP_DEFAULTS | CEC_CAP_NEEDS_HPD;
|
||||
unsigned int num_las = 1;
|
||||
u8 cap;
|
||||
|
||||
#ifndef CONFIG_MEDIA_CEC_RC
|
||||
/*
|
||||
* CEC_CAP_RC is part of CEC_CAP_DEFAULTS, but it is stripped by
|
||||
* cec_allocate_adapter() if CONFIG_MEDIA_CEC_RC is undefined.
|
||||
*
|
||||
* Do this here as well to ensure the tests against cec_caps are
|
||||
* correct.
|
||||
*/
|
||||
cec_caps &= ~CEC_CAP_RC;
|
||||
#endif
|
||||
cancel_delayed_work_sync(&aux->cec.unregister_work);
|
||||
|
||||
mutex_lock(&aux->cec.lock);
|
||||
if (!drm_dp_cec_cap(aux, &cap)) {
|
||||
/* CEC is not supported, unregister any existing adapter */
|
||||
cec_unregister_adapter(aux->cec.adap);
|
||||
aux->cec.adap = NULL;
|
||||
goto unlock;
|
||||
}
|
||||
|
||||
if (cap & DP_CEC_SNOOPING_CAPABLE)
|
||||
cec_caps |= CEC_CAP_MONITOR_ALL;
|
||||
if (cap & DP_CEC_MULTIPLE_LA_CAPABLE)
|
||||
num_las = CEC_MAX_LOG_ADDRS;
|
||||
|
||||
if (aux->cec.adap) {
|
||||
if (aux->cec.adap->capabilities == cec_caps &&
|
||||
aux->cec.adap->available_log_addrs == num_las) {
|
||||
/* Unchanged, so just set the phys addr */
|
||||
cec_s_phys_addr_from_edid(aux->cec.adap, edid);
|
||||
goto unlock;
|
||||
}
|
||||
/*
|
||||
* The capabilities changed, so unregister the old
|
||||
* adapter first.
|
||||
*/
|
||||
cec_unregister_adapter(aux->cec.adap);
|
||||
}
|
||||
|
||||
/* Create a new adapter */
|
||||
aux->cec.adap = cec_allocate_adapter(&drm_dp_cec_adap_ops,
|
||||
aux, aux->cec.name, cec_caps,
|
||||
num_las);
|
||||
if (IS_ERR(aux->cec.adap)) {
|
||||
aux->cec.adap = NULL;
|
||||
goto unlock;
|
||||
}
|
||||
if (cec_register_adapter(aux->cec.adap, aux->cec.parent)) {
|
||||
cec_delete_adapter(aux->cec.adap);
|
||||
aux->cec.adap = NULL;
|
||||
} else {
|
||||
/*
|
||||
* Update the phys addr for the new CEC adapter. When called
|
||||
* from drm_dp_cec_register_connector() edid == NULL, so in
|
||||
* that case the phys addr is just invalidated.
|
||||
*/
|
||||
cec_s_phys_addr_from_edid(aux->cec.adap, edid);
|
||||
}
|
||||
unlock:
|
||||
mutex_unlock(&aux->cec.lock);
|
||||
}
|
||||
EXPORT_SYMBOL(drm_dp_cec_set_edid);
|
||||
|
||||
/*
|
||||
* The EDID disappeared (likely because of the HPD going down).
|
||||
*/
|
||||
void drm_dp_cec_unset_edid(struct drm_dp_aux *aux)
|
||||
{
|
||||
cancel_delayed_work_sync(&aux->cec.unregister_work);
|
||||
|
||||
mutex_lock(&aux->cec.lock);
|
||||
if (!aux->cec.adap)
|
||||
goto unlock;
|
||||
|
||||
cec_phys_addr_invalidate(aux->cec.adap);
|
||||
/*
|
||||
* We're done if we want to keep the CEC device
|
||||
* (drm_dp_cec_unregister_delay is >= NEVER_UNREG_DELAY) or if the
|
||||
* DPCD still indicates the CEC capability (expected for an integrated
|
||||
* HDMI branch device).
|
||||
*/
|
||||
if (drm_dp_cec_unregister_delay < NEVER_UNREG_DELAY &&
|
||||
!drm_dp_cec_cap(aux, NULL)) {
|
||||
/*
|
||||
* Unregister the CEC adapter after drm_dp_cec_unregister_delay
|
||||
* seconds. This to debounce short HPD off-and-on cycles from
|
||||
* displays.
|
||||
*/
|
||||
schedule_delayed_work(&aux->cec.unregister_work,
|
||||
drm_dp_cec_unregister_delay * HZ);
|
||||
}
|
||||
unlock:
|
||||
mutex_unlock(&aux->cec.lock);
|
||||
}
|
||||
EXPORT_SYMBOL(drm_dp_cec_unset_edid);
|
||||
|
||||
/**
|
||||
* drm_dp_cec_register_connector() - register a new connector
|
||||
* @aux: DisplayPort AUX channel
|
||||
* @name: name of the CEC device
|
||||
* @parent: parent device
|
||||
*
|
||||
* A new connector was registered with associated CEC adapter name and
|
||||
* CEC adapter parent device. After registering the name and parent
|
||||
* drm_dp_cec_set_edid() is called to check if the connector supports
|
||||
* CEC and to register a CEC adapter if that is the case.
|
||||
*/
|
||||
void drm_dp_cec_register_connector(struct drm_dp_aux *aux, const char *name,
|
||||
struct device *parent)
|
||||
{
|
||||
WARN_ON(aux->cec.adap);
|
||||
aux->cec.name = name;
|
||||
aux->cec.parent = parent;
|
||||
INIT_DELAYED_WORK(&aux->cec.unregister_work,
|
||||
drm_dp_cec_unregister_work);
|
||||
|
||||
drm_dp_cec_set_edid(aux, NULL);
|
||||
}
|
||||
EXPORT_SYMBOL(drm_dp_cec_register_connector);
|
||||
|
||||
/**
|
||||
* drm_dp_cec_unregister_connector() - unregister the CEC adapter, if any
|
||||
* @aux: DisplayPort AUX channel
|
||||
*/
|
||||
void drm_dp_cec_unregister_connector(struct drm_dp_aux *aux)
|
||||
{
|
||||
if (!aux->cec.adap)
|
||||
return;
|
||||
cancel_delayed_work_sync(&aux->cec.unregister_work);
|
||||
cec_unregister_adapter(aux->cec.adap);
|
||||
aux->cec.adap = NULL;
|
||||
}
|
||||
EXPORT_SYMBOL(drm_dp_cec_unregister_connector);
|
|
@ -1087,6 +1087,7 @@ static void drm_dp_aux_crc_work(struct work_struct *work)
|
|||
void drm_dp_aux_init(struct drm_dp_aux *aux)
|
||||
{
|
||||
mutex_init(&aux->hw_mutex);
|
||||
mutex_init(&aux->cec.lock);
|
||||
INIT_WORK(&aux->crc_work, drm_dp_aux_crc_work);
|
||||
|
||||
aux->ddc.algo = &drm_dp_i2c_algo;
|
||||
|
|
|
@ -1078,6 +1078,25 @@ struct drm_dp_aux_msg {
|
|||
size_t size;
|
||||
};
|
||||
|
||||
struct cec_adapter;
|
||||
struct edid;
|
||||
|
||||
/**
|
||||
* struct drm_dp_aux_cec - DisplayPort CEC-Tunneling-over-AUX
|
||||
* @lock: mutex protecting this struct
|
||||
* @adap: the CEC adapter for CEC-Tunneling-over-AUX support.
|
||||
* @name: name of the CEC adapter
|
||||
* @parent: parent device of the CEC adapter
|
||||
* @unregister_work: unregister the CEC adapter
|
||||
*/
|
||||
struct drm_dp_aux_cec {
|
||||
struct mutex lock;
|
||||
struct cec_adapter *adap;
|
||||
const char *name;
|
||||
struct device *parent;
|
||||
struct delayed_work unregister_work;
|
||||
};
|
||||
|
||||
/**
|
||||
* struct drm_dp_aux - DisplayPort AUX channel
|
||||
* @name: user-visible name of this AUX channel and the I2C-over-AUX adapter
|
||||
|
@ -1136,6 +1155,10 @@ struct drm_dp_aux {
|
|||
* @i2c_defer_count: Counts I2C DEFERs, used for DP validation.
|
||||
*/
|
||||
unsigned i2c_defer_count;
|
||||
/**
|
||||
* @cec: struct containing fields used for CEC-Tunneling-over-AUX.
|
||||
*/
|
||||
struct drm_dp_aux_cec cec;
|
||||
};
|
||||
|
||||
ssize_t drm_dp_dpcd_read(struct drm_dp_aux *aux, unsigned int offset,
|
||||
|
@ -1258,4 +1281,37 @@ drm_dp_has_quirk(const struct drm_dp_desc *desc, enum drm_dp_quirk quirk)
|
|||
return desc->quirks & BIT(quirk);
|
||||
}
|
||||
|
||||
#ifdef CONFIG_DRM_DP_CEC
|
||||
void drm_dp_cec_irq(struct drm_dp_aux *aux);
|
||||
void drm_dp_cec_register_connector(struct drm_dp_aux *aux, const char *name,
|
||||
struct device *parent);
|
||||
void drm_dp_cec_unregister_connector(struct drm_dp_aux *aux);
|
||||
void drm_dp_cec_set_edid(struct drm_dp_aux *aux, const struct edid *edid);
|
||||
void drm_dp_cec_unset_edid(struct drm_dp_aux *aux);
|
||||
#else
|
||||
static inline void drm_dp_cec_irq(struct drm_dp_aux *aux)
|
||||
{
|
||||
}
|
||||
|
||||
static inline void drm_dp_cec_register_connector(struct drm_dp_aux *aux,
|
||||
const char *name,
|
||||
struct device *parent)
|
||||
{
|
||||
}
|
||||
|
||||
static inline void drm_dp_cec_unregister_connector(struct drm_dp_aux *aux)
|
||||
{
|
||||
}
|
||||
|
||||
static inline void drm_dp_cec_set_edid(struct drm_dp_aux *aux,
|
||||
const struct edid *edid)
|
||||
{
|
||||
}
|
||||
|
||||
static inline void drm_dp_cec_unset_edid(struct drm_dp_aux *aux)
|
||||
{
|
||||
}
|
||||
|
||||
#endif
|
||||
|
||||
#endif /* _DRM_DP_HELPER_H_ */
|
||||
|
|
Loading…
Reference in New Issue
Block a user