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drm/i915: add module param "enable_dp_mst"

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Adds an (unsafe; auto-kernel-tainting) boolean module parameter to the i915
drm driver: "enable_dp_mst", which is enabled by default.  Disabling the
parameter forces newly connected DisplayPort sinks to report as not
supporting multi-stream transport (MST), thus "forcing" the use of
single-stream transport (SST).

v2: rename parameter to conform to style
v3: add signoff

Signed-off-by: Nathan Schulte <nmschulte@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1458054845-5837-1-git-send-email-nmschulte@gmail.com
This commit is contained in:
Nathan Schulte
2016-03-15 10:14:05 -05:00
committed by Daniel Vetter
parent 117897f42c
commit 7cc96139d9
3 changed files with 9 additions and 0 deletions
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3
drivers/gpu/drm/i915/intel_dp.c
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@@ -3882,6 +3882,9 @@ intel_dp_probe_mst(struct intel_dp *intel_dp)
{
u8 buf[1];
if (!i915.enable_dp_mst)
return false;
if (!intel_dp->can_mst)
return false;