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drm: add support for DisplayPort CEC-Tunneling-over-AUX

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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:
Hans Verkuil
2018-07-11 15:29:07 +02:00
committed by Ville Syrjälä
parent cf19fa2cfa
commit 2c6d1fffa1
5 changed files with 496 additions and 0 deletions
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56
include/drm/drm_dp_helper.h
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@@ -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_ */