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author | Dave Airlie <airlied@redhat.com> | 2017-06-16 13:58:27 +1000 |
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committer | Dave Airlie <airlied@redhat.com> | 2017-06-16 13:58:27 +1000 |
commit | 925344ccc91d7a7fd84cab2dece1c34bbd86fd8c (patch) | |
tree | bd4110dc5a3b70a5674b9d6d5340cc1889f5d6e8 /include/drm | |
parent | a6821698918a579e7219d706092e83f367f01ba2 (diff) | |
parent | 32c1431eea4881a6b17bd7c639315010aeefa452 (diff) | |
download | linux-925344ccc91d7a7fd84cab2dece1c34bbd86fd8c.tar.bz2 |
BackMerge tag 'v4.12-rc5' into drm-next
Linux 4.12-rc5 for nouveau fixes
Diffstat (limited to 'include/drm')
-rw-r--r-- | include/drm/drm_dp_helper.h | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h index 20eb5ca28594..b17476a6909c 100644 --- a/include/drm/drm_dp_helper.h +++ b/include/drm/drm_dp_helper.h @@ -1081,4 +1081,55 @@ void drm_dp_aux_unregister(struct drm_dp_aux *aux); int drm_dp_start_crc(struct drm_dp_aux *aux, struct drm_crtc *crtc); int drm_dp_stop_crc(struct drm_dp_aux *aux); +struct drm_dp_dpcd_ident { + u8 oui[3]; + u8 device_id[6]; + u8 hw_rev; + u8 sw_major_rev; + u8 sw_minor_rev; +} __packed; + +/** + * struct drm_dp_desc - DP branch/sink device descriptor + * @ident: DP device identification from DPCD 0x400 (sink) or 0x500 (branch). + * @quirks: Quirks; use drm_dp_has_quirk() to query for the quirks. + */ +struct drm_dp_desc { + struct drm_dp_dpcd_ident ident; + u32 quirks; +}; + +int drm_dp_read_desc(struct drm_dp_aux *aux, struct drm_dp_desc *desc, + bool is_branch); + +/** + * enum drm_dp_quirk - Display Port sink/branch device specific quirks + * + * Display Port sink and branch devices in the wild have a variety of bugs, try + * to collect them here. The quirks are shared, but it's up to the drivers to + * implement workarounds for them. + */ +enum drm_dp_quirk { + /** + * @DP_DPCD_QUIRK_LIMITED_M_N: + * + * The device requires main link attributes Mvid and Nvid to be limited + * to 16 bits. + */ + DP_DPCD_QUIRK_LIMITED_M_N, +}; + +/** + * drm_dp_has_quirk() - does the DP device have a specific quirk + * @desc: Device decriptor filled by drm_dp_read_desc() + * @quirk: Quirk to query for + * + * Return true if DP device identified by @desc has @quirk. + */ +static inline bool +drm_dp_has_quirk(const struct drm_dp_desc *desc, enum drm_dp_quirk quirk) +{ + return desc->quirks & BIT(quirk); +} + #endif /* _DRM_DP_HELPER_H_ */ |