| Message ID | 1467803094-10473-6-git-send-email-mika.kahola@intel.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Wed, Jul 06, 2016 at 02:04:49PM +0300, Mika Kahola wrote: > Read DisplayPort branch device id string. Reviewed-by: Jim Bride <jim.bride@linux.intel.com> > > Signed-off-by: Mika Kahola <mika.kahola@intel.com> > --- > drivers/gpu/drm/drm_dp_helper.c | 12 ++++++++++++ > include/drm/drm_dp_helper.h | 2 ++ > 2 files changed, 14 insertions(+) > > diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c > index 95d624a..4003464 100644 > --- a/drivers/gpu/drm/drm_dp_helper.c > +++ b/drivers/gpu/drm/drm_dp_helper.c > @@ -513,6 +513,18 @@ int drm_dp_downstream_max_bpc(const u8 dpcd[DP_RECEIVER_CAP_SIZE], > } > EXPORT_SYMBOL(drm_dp_downstream_max_bpc); > > +/** > + * drm_dp_downstream_id() - identify branch device > + * @aux: DisplayPort AUX channel > + * > + * Returns branch device id on success or NULL on failure > + */ > +int drm_dp_downstream_id(struct drm_dp_aux *aux, char id[6]) > +{ > + return drm_dp_dpcd_read(aux, DP_BRANCH_ID, id, 6); > +} > +EXPORT_SYMBOL(drm_dp_downstream_id); > + > /* > * I2C-over-AUX implementation > */ > diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h > index 47ae8ed..8264d54 100644 > --- a/include/drm/drm_dp_helper.h > +++ b/include/drm/drm_dp_helper.h > @@ -445,6 +445,7 @@ > #define DP_SOURCE_OUI 0x300 > #define DP_SINK_OUI 0x400 > #define DP_BRANCH_OUI 0x500 > +#define DP_BRANCH_ID 0x503 > > #define DP_SET_POWER 0x600 > # define DP_SET_POWER_D0 0x1 > @@ -810,6 +811,7 @@ int drm_dp_downstream_max_clock(const u8 dpcd[DP_RECEIVER_CAP_SIZE], > const u8 port_cap[4]); > int drm_dp_downstream_max_bpc(const u8 dpcd[DP_RECEIVER_CAP_SIZE], > const u8 port_cap[4]); > +int drm_dp_downstream_id(struct drm_dp_aux *aux, char id[6]); > > void drm_dp_aux_init(struct drm_dp_aux *aux); > int drm_dp_aux_register(struct drm_dp_aux *aux); > -- > 1.9.1
diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c index 95d624a..4003464 100644 --- a/drivers/gpu/drm/drm_dp_helper.c +++ b/drivers/gpu/drm/drm_dp_helper.c @@ -513,6 +513,18 @@ int drm_dp_downstream_max_bpc(const u8 dpcd[DP_RECEIVER_CAP_SIZE], } EXPORT_SYMBOL(drm_dp_downstream_max_bpc); +/** + * drm_dp_downstream_id() - identify branch device + * @aux: DisplayPort AUX channel + * + * Returns branch device id on success or NULL on failure + */ +int drm_dp_downstream_id(struct drm_dp_aux *aux, char id[6]) +{ + return drm_dp_dpcd_read(aux, DP_BRANCH_ID, id, 6); +} +EXPORT_SYMBOL(drm_dp_downstream_id); + /* * I2C-over-AUX implementation */ diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h index 47ae8ed..8264d54 100644 --- a/include/drm/drm_dp_helper.h +++ b/include/drm/drm_dp_helper.h @@ -445,6 +445,7 @@ #define DP_SOURCE_OUI 0x300 #define DP_SINK_OUI 0x400 #define DP_BRANCH_OUI 0x500 +#define DP_BRANCH_ID 0x503 #define DP_SET_POWER 0x600 # define DP_SET_POWER_D0 0x1 @@ -810,6 +811,7 @@ int drm_dp_downstream_max_clock(const u8 dpcd[DP_RECEIVER_CAP_SIZE], const u8 port_cap[4]); int drm_dp_downstream_max_bpc(const u8 dpcd[DP_RECEIVER_CAP_SIZE], const u8 port_cap[4]); +int drm_dp_downstream_id(struct drm_dp_aux *aux, char id[6]); void drm_dp_aux_init(struct drm_dp_aux *aux); int drm_dp_aux_register(struct drm_dp_aux *aux);
Read DisplayPort branch device id string. Signed-off-by: Mika Kahola <mika.kahola@intel.com> --- drivers/gpu/drm/drm_dp_helper.c | 12 ++++++++++++ include/drm/drm_dp_helper.h | 2 ++ 2 files changed, 14 insertions(+)