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drm/i915: Read DP branch device SW revision

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SW revision is mandatory field for DisplayPort branch
devices. This is defined in DPCD register fields 0x50A
and 0x50B.

v2: move drm_dp_ds_revision structure to be part of
    drm_dp_link structure (Daniel)
v3: remove dependency to drm_dp_helper but instead parse
    DPCD and print SW revision info to dmesg (Ville)
v4: commit message fix (Jim Bride)

Signed-off-by: Mika Kahola <mika.kahola@intel.com>
Reviewed-by: Jim Bride <jim.bride@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1473419458-17080-9-git-send-email-mika.kahola@intel.com
This commit is contained in:
Mika Kahola
2016-09-09 14:10:54 +03:00
committed by Jani Nikula
parent 0e390a33a6
commit 1a2724fa94
2 changed files with 21 additions and 0 deletions
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1
include/drm/drm_dp_helper.h
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@@ -447,6 +447,7 @@
#define DP_BRANCH_OUI 0x500
#define DP_BRANCH_ID 0x503
#define DP_BRANCH_HW_REV 0x509
#define DP_BRANCH_SW_REV 0x50A
#define DP_SET_POWER 0x600
# define DP_SET_POWER_D0 0x1