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drm/i915: add module param "enable_dp_mst" 

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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5
drivers/gpu/drm/i915/i915_params.c
View File

@ -56,6 +56,7 @@ struct i915_params i915 __read_mostly = {
.edp_vswing = 0,
.enable_guc_submission = false,
.guc_log_level = -1,
.enable_dp_mst = true,
};
module_param_named(modeset, i915.modeset, int, 0400);
@ -201,3 +202,7 @@ MODULE_PARM_DESC(enable_guc_submission, "Enable GuC submission (default:false)")
module_param_named(guc_log_level, i915.guc_log_level, int, 0400);
MODULE_PARM_DESC(guc_log_level,
"GuC firmware logging level (-1:disabled (default), 0-3:enabled)");
module_param_named_unsafe(enable_dp_mst, i915.enable_dp_mst, bool, 0600);
MODULE_PARM_DESC(enable_dp_mst,
"Enable multi-stream transport (MST) for new DisplayPort sinks. (default: true)");

1
drivers/gpu/drm/i915/i915_params.h
View File

@ -59,6 +59,7 @@ struct i915_params {
bool enable_guc_submission;
bool verbose_state_checks;
bool nuclear_pageflip;
bool enable_dp_mst;
};
extern struct i915_params i915 __read_mostly;

3
drivers/gpu/drm/i915/intel_dp.c
View File

@ -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;