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| author |   Jerry (Fangzhi) Zuo <Jerry.Zuo@amd.com> | 2020-02-11 11:08:32 -0500 |
|---|---|---|
| committer |   Rodrigo Siqueira <rodrigosiqueiramelo@gmail.com> | 2020-02-13 18:33:58 -0500 |
| commit | e11f5bd8228fc3760c221f940b9f6365dbf3e7ed (patch) | |
| tree | bc5aeb67afdb3efbadaaf17819c228e5c2c9efd4 /include/drm | |
| parent | drm: Remove legacy version of get_scanout_position() (diff) | |
| download | wireguard-linux-e11f5bd8228fc3760c221f940b9f6365dbf3e7ed.tar.xz wireguard-linux-e11f5bd8228fc3760c221f940b9f6365dbf3e7ed.zip | |
drm: Add support for DP 1.4 Compliance edid corruption test
Unlike DP 1.2 edid corruption test, DP 1.4 requires to calculate
real CRC value of the last edid data block, and write it back.
Current edid CRC calculates routine adds the last CRC byte,
and check if non-zero.
This behavior is not accurate; actually, we need to return
the actual CRC value when corruption is detected.
This commit changes this issue by returning the calculated CRC,
and initiate the required sequence.
Change since v7
- Fix for CI.CHECKPATCH
Change since v6
- Add return check
Change since v5
- Obtain real CRC value before dumping bad edid
Change since v4
- Fix for CI.CHECKPATCH
Change since v3
- Fix a minor typo.
Change since v2
- Rewrite checksum computation routine to avoid duplicated code.
- Rename to avoid confusion.
Change since v1
- Have separate routine for returning real CRC.
Signed-off-by: Jerry (Fangzhi) Zuo <Jerry.Zuo@amd.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Reviewed-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Rodrigo Siqueira <rodrigosiqueiramelo@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200211160832.24259-1-Jerry.Zuo@amd.com
Diffstat (limited to 'include/drm')
| -rw-r--r-- | include/drm/drm_connector.h | 6 | ||||
| -rw-r--r-- | include/drm/drm_dp_helper.h | 3 |
2 files changed, 9 insertions, 0 deletions
diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h index 2113500b4075..b3815371c271 100644 --- a/include/drm/drm_connector.h +++ b/include/drm/drm_connector.h @@ -1357,6 +1357,12 @@ struct drm_connector { * rev1.1 4.2.2.6 */ bool edid_corrupt; + /** + * @real_edid_checksum: real edid checksum for corrupted edid block. + * Required in Displayport 1.4 compliance testing + * rev1.1 4.2.2.6 + */ + u8 real_edid_checksum; /** @debugfs_entry: debugfs directory for this connector */ struct dentry *debugfs_entry; diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h index 127d6e1d3338..957a3d00ee05 100644 --- a/include/drm/drm_dp_helper.h +++ b/include/drm/drm_dp_helper.h @@ -1459,6 +1459,9 @@ static inline ssize_t drm_dp_dpcd_writeb(struct drm_dp_aux *aux, int drm_dp_dpcd_read_link_status(struct drm_dp_aux *aux, u8 status[DP_LINK_STATUS_SIZE]); +bool drm_dp_send_real_edid_checksum(struct drm_dp_aux *aux, + u8 real_edid_checksum); + 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], |