From: Dave Airlie <airl...@redhat.com>
Since DP MST has new userspace requirements and any effort at trying
to shoehorn things into the something the current userspace can handle are
doomed, lets just put this behind a config option.
This also adds a command line arg to switch it on as well.
Distros should probably turn it on when they have a new enough Xorg intel
driver.
Signed-off-by: Dave Airlie <airl...@redhat.com>
---
drivers/gpu/drm/i915/Kconfig | 10 ++++++++++
drivers/gpu/drm/i915/i915_drv.h | 1 +
drivers/gpu/drm/i915/i915_params.c | 5 +++++
drivers/gpu/drm/i915/intel_dp_mst.c | 3 +++
4 files changed, 19 insertions(+)
diff --git a/drivers/gpu/drm/i915/Kconfig b/drivers/gpu/drm/i915/Kconfig
index 4e39ab3..94a9094 100644
--- a/drivers/gpu/drm/i915/Kconfig
+++ b/drivers/gpu/drm/i915/Kconfig
@@ -69,3 +69,13 @@ config DRM_I915_PRELIMINARY_HW_SUPPORT
option changes the default for that module option.
If in doubt, say "N".
+
+config DRM_I915_DP_MST
+ bool "Enable DisplayPort 1.2 MST support by default"
+ depends on DRM_I915
+ default n
+ help
+ Choose this option if you want to support DP 1.2 MST and have a new
+ enough userspace to use it. DP 1.2 MST is required for multi-head
+ support on many laptop docks when combined with Haswell or later
+ chipsets.
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 7a830ea..86759ea 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -2149,6 +2149,7 @@ struct i915_params {
bool disable_vtd_wa;
int use_mmio_flip;
bool mmio_debug;
+ bool dp_mst;
};
extern struct i915_params i915 __read_mostly;
diff --git a/drivers/gpu/drm/i915/i915_params.c
b/drivers/gpu/drm/i915/i915_params.c
index 7f84dd26..973c773 100644
--- a/drivers/gpu/drm/i915/i915_params.c
+++ b/drivers/gpu/drm/i915/i915_params.c
@@ -50,6 +50,7 @@ struct i915_params i915 __read_mostly = {
.disable_vtd_wa = 0,
.use_mmio_flip = 0,
.mmio_debug = 0,
+ .dp_mst = IS_ENABLED(CONFIG_DRM_I915_DP_MST),
};
module_param_named(modeset, i915.modeset, int, 0400);
@@ -167,3 +168,7 @@ module_param_named(mmio_debug, i915.mmio_debug, bool, 0600);
MODULE_PARM_DESC(mmio_debug,
"Enable the MMIO debug code (default: false). This may negatively "
"affect performance.");
+
+module_param_named(dp_mst, i915.dp_mst, bool, 0600);
+MODULE_PARM_DESC(dp_mst,
+ "Enable DP MST support (1=enabled, 0=disabled, default depends on
CONFIG_DRM_I915_DP_MST.");
diff --git a/drivers/gpu/drm/i915/intel_dp_mst.c
b/drivers/gpu/drm/i915/intel_dp_mst.c
index d9a7a78..116b656 100644
--- a/drivers/gpu/drm/i915/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/intel_dp_mst.c
@@ -522,6 +522,9 @@ intel_dp_mst_encoder_init(struct intel_digital_port
*intel_dig_port, int conn_ba
struct drm_device *dev = intel_dig_port->base.base.dev;
int ret;
+ if (i915.dp_mst == false)
+ return 0;
+
intel_dp->can_mst = true;
intel_dp->mst_mgr.cbs = &mst_cbs;
--
1.9.3
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