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authorJani Nikula <jani.nikula@intel.com>2017-05-18 14:10:22 +0300
committerJani Nikula <jani.nikula@intel.com>2017-05-29 13:36:57 +0300
commit118b90f3f18e733c99f0e8b98ea31a815ffc4d14 (patch)
treec8a4302f16986bec4878eb1c014265821d5e1997 /include/drm
parent5ed02dbb497422bf225783f46e6eadd237d23d6b (diff)
downloadlinux-118b90f3f18e733c99f0e8b98ea31a815ffc4d14.tar.bz2
drm/dp: add helper for reading DP sink/branch device desc from DPCD
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by: Jani Nikula <jani.nikula@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/acba54da7d80eafea9e59a893e27e3c31028c0ba.1495105635.git.jani.nikula@intel.com
Diffstat (limited to 'include/drm')
-rw-r--r--include/drm/drm_dp_helper.h19
1 files changed, 19 insertions, 0 deletions
diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
index c0bd0d7651a9..84502da177a1 100644
--- a/include/drm/drm_dp_helper.h
+++ b/include/drm/drm_dp_helper.h
@@ -913,4 +913,23 @@ 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).
+ */
+struct drm_dp_desc {
+ struct drm_dp_dpcd_ident ident;
+};
+
+int drm_dp_read_desc(struct drm_dp_aux *aux, struct drm_dp_desc *desc,
+ bool is_branch);
+
#endif /* _DRM_DP_HELPER_H_ */