diff options
| author | Ville Syrjälä <ville.syrjala@linux.intel.com> | 2020-09-04 14:53:49 +0300 |
|---|---|---|
| committer | Ville Syrjälä <ville.syrjala@linux.intel.com> | 2020-09-17 18:33:22 +0300 |
| commit | 7af655bce275f49b200b552921e55673624943c5 (patch) | |
| tree | 6ea7a896d2a2d7c9844ec6b4fbdd4b1b78356c4b /drivers | |
| parent | b7feffd584ba15de54ba465a3b32f775c70e1907 (diff) | |
drm/dp: Add drm_dp_downstream_mode()
The downstream facing port caps in the DPCD can give us a hint
as to what kind of display mode the sink can use if it doesn't
have an EDID. Use that information to pick a suitable mode.
v2: Use Returns: for kdoc (Lyude)
Add kdocs for drm_display_mode_from_cea_vic() (Lyude)
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200904115354.25336-14-ville.syrjala@linux.intel.com
Reviewed-by: Lyude Paul <lyude@redhat.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/gpu/drm/drm_dp_helper.c | 54 | ||||
| -rw-r--r-- | drivers/gpu/drm/drm_edid.c | 28 |
2 files changed, 82 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c index 5d8c9bd700c9..63ac94c54e95 100644 --- a/drivers/gpu/drm/drm_dp_helper.c +++ b/drivers/gpu/drm/drm_dp_helper.c @@ -809,6 +809,60 @@ int drm_dp_downstream_max_bpc(const u8 dpcd[DP_RECEIVER_CAP_SIZE], EXPORT_SYMBOL(drm_dp_downstream_max_bpc); /** + * drm_dp_downstream_mode() - return a mode for downstream facing port + * @dpcd: DisplayPort configuration data + * @port_cap: port capabilities + * + * Provides a suitable mode for downstream facing ports without EDID. + * + * Returns: A new drm_display_mode on success or NULL on failure + */ +struct drm_display_mode * +drm_dp_downstream_mode(struct drm_device *dev, + const u8 dpcd[DP_RECEIVER_CAP_SIZE], + const u8 port_cap[4]) + +{ + u8 vic; + + if (!drm_dp_is_branch(dpcd)) + return NULL; + + if (dpcd[DP_DPCD_REV] < 0x11) + return NULL; + + switch (port_cap[0] & DP_DS_PORT_TYPE_MASK) { + case DP_DS_PORT_TYPE_NON_EDID: + switch (port_cap[0] & DP_DS_NON_EDID_MASK) { + case DP_DS_NON_EDID_720x480i_60: + vic = 6; + break; + case DP_DS_NON_EDID_720x480i_50: + vic = 21; + break; + case DP_DS_NON_EDID_1920x1080i_60: + vic = 5; + break; + case DP_DS_NON_EDID_1920x1080i_50: + vic = 20; + break; + case DP_DS_NON_EDID_1280x720_60: + vic = 4; + break; + case DP_DS_NON_EDID_1280x720_50: + vic = 19; + break; + default: + return NULL; + } + return drm_display_mode_from_cea_vic(dev, vic); + default: + return NULL; + } +} +EXPORT_SYMBOL(drm_dp_downstream_mode); + +/** * drm_dp_downstream_id() - identify branch device * @aux: DisplayPort AUX channel * @id: DisplayPort branch device id diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c index 6840f0530a38..a82f37d44258 100644 --- a/drivers/gpu/drm/drm_edid.c +++ b/drivers/gpu/drm/drm_edid.c @@ -3738,6 +3738,34 @@ drm_add_cmdb_modes(struct drm_connector *connector, u8 svd) bitmap_set(hdmi->y420_cmdb_modes, vic, 1); } +/** + * drm_display_mode_from_cea_vic() - return a mode for CEA VIC + * @dev: DRM device + * @vic: CEA VIC of the mode + * + * Creates a new mode matching the specified CEA VIC. + * + * Returns: A new drm_display_mode on success or NULL on failure + */ +struct drm_display_mode * +drm_display_mode_from_cea_vic(struct drm_device *dev, + u8 video_code) +{ + const struct drm_display_mode *cea_mode; + struct drm_display_mode *newmode; + + cea_mode = cea_mode_for_vic(video_code); + if (!cea_mode) + return NULL; + + newmode = drm_mode_duplicate(dev, cea_mode); + if (!newmode) + return NULL; + + return newmode; +} +EXPORT_SYMBOL(drm_display_mode_from_cea_vic); + static int do_cea_modes(struct drm_connector *connector, const u8 *db, u8 len) { |