diff options
| author | Mika Kahola <mika.kahola@intel.com> | 2016-09-09 14:10:54 +0300 |
|---|---|---|
| committer | Jani Nikula <jani.nikula@intel.com> | 2016-09-15 14:50:33 +0300 |
| commit | 1a2724fa94b6308dee87f7851be7ec84a409a538 (patch) | |
| tree | 68f83c1eb6f4767fbef2805b3f68c395bfe5c6e7 /drivers/gpu/drm/i915 | |
| parent | 0e390a33a668f97ea3ffa7c6ceb4266e1b39450a (diff) | |
| download | linux-1a2724fa94b6308dee87f7851be7ec84a409a538.tar.xz | |
drm/i915: Read DP branch device SW revision
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
Diffstat (limited to 'drivers/gpu/drm/i915')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_dp.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index bb0417c52154..7428c729ed4e 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -1438,6 +1438,25 @@ static void intel_dp_print_hw_revision(struct intel_dp *intel_dp) DRM_DEBUG_KMS("sink hw revision: %d.%d\n", (rev & 0xf0) >> 4, rev & 0xf); } +static void intel_dp_print_sw_revision(struct intel_dp *intel_dp) +{ + uint8_t rev[2]; + int len; + + if ((drm_debug & DRM_UT_KMS) == 0) + return; + + if (!(intel_dp->dpcd[DP_DOWNSTREAMPORT_PRESENT] & + DP_DWN_STRM_PORT_PRESENT)) + return; + + len = drm_dp_dpcd_read(&intel_dp->aux, DP_BRANCH_SW_REV, &rev, 2); + if (len < 0) + return; + + DRM_DEBUG_KMS("sink sw revision: %d.%d\n", rev[0], rev[1]); +} + static int rate_to_index(int find, const int *rates) { int i = 0; @@ -4332,6 +4351,7 @@ intel_dp_long_pulse(struct intel_connector *intel_connector) intel_dp_probe_oui(intel_dp); intel_dp_print_hw_revision(intel_dp); + intel_dp_print_sw_revision(intel_dp); intel_dp_configure_mst(intel_dp); |