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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2017-06-02 11:32:38 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-06-02 11:32:38 -0700 |
| commit | 46356945fc2bc932dd224af60c12ece2672479be (patch) | |
| tree | a1c08091904b9024f1642e03b7131d39c2581011 /drivers/gpu/drm/i915/intel_dp_mst.c | |
| parent | c531577bcdac51225f50033e0c89644873f4dc6d (diff) | |
| parent | 28904eeced2c6cf6d315c675e79e1700ef7507ac (diff) | |
Merge tag 'drm-dp-quirk-for-v4.12-rc4' of git://people.freedesktop.org/~airlied/linux
Pull drm displayport quirk support:
"DP quirk for usb c dongles.
As mentioned I have a separate request for fixing a regression, but
also keeping the broken hw working, for certain USB-C DP adapters they
require a minimised n/m parameters, but an attempt to do this
generically has failed, we need to quirk these specific adapters.
However doing it generically regressed some eDP panels.
This pull adds the infrastructure and a quirk for the adapter"
* tag 'drm-dp-quirk-for-v4.12-rc4' of git://people.freedesktop.org/~airlied/linux:
drm/i915: Detect USB-C specific dongles before reducing M and N
drm/dp: start a DPCD based DP sink/branch device quirk database
drm/i915: use drm DP helper to read DPCD desc
drm/dp: add helper for reading DP sink/branch device desc from DPCD
Diffstat (limited to 'drivers/gpu/drm/i915/intel_dp_mst.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_dp_mst.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/gpu/drm/i915/intel_dp_mst.c b/drivers/gpu/drm/i915/intel_dp_mst.c index c1f62eb07c07..989e25577ac0 100644 --- a/drivers/gpu/drm/i915/intel_dp_mst.c +++ b/drivers/gpu/drm/i915/intel_dp_mst.c @@ -44,6 +44,8 @@ static bool intel_dp_mst_compute_config(struct intel_encoder *encoder, int lane_count, slots; const struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode; int mst_pbn; + bool reduce_m_n = drm_dp_has_quirk(&intel_dp->desc, + DP_DPCD_QUIRK_LIMITED_M_N); pipe_config->has_pch_encoder = false; bpp = 24; @@ -75,7 +77,8 @@ static bool intel_dp_mst_compute_config(struct intel_encoder *encoder, intel_link_compute_m_n(bpp, lane_count, adjusted_mode->crtc_clock, pipe_config->port_clock, - &pipe_config->dp_m_n); + &pipe_config->dp_m_n, + reduce_m_n); pipe_config->dp_m_n.tu = slots; |