From: Clint Taylor <clinton.a.taylor@xxxxxxxxx>
DDIA Lane capability control 4 lane bit is not being set by firmware during
clone mode boot. This occurs when multiple monitors are connected during
boot. The driver will configure the port for 2 lane maximum width if this
bit is not set.
Cc: Mika Kahola <mika.kahola@xxxxxxxxx>
Signed-off-by: Clint Taylor <clinton.a.taylor@xxxxxxxxx>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
---
drivers/gpu/drm/i915/intel_ddi.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index a9c0c16e3838..0ad915d71132 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -2791,9 +2791,10 @@ void intel_ddi_init(struct drm_i915_private *dev_priv, enum port port)
* configuration so that we use the proper lane count for our
* calculations.
*/
- if (IS_GEN9_LP(dev_priv) && port == PORT_A) {
+ if ((IS_GEN9_LP(dev_priv) || IS_CANNONLAKE(dev_priv)) &&
+ port == PORT_A) {
if (!(intel_dig_port->saved_port_bits & DDI_A_4_LANES)) {
- DRM_DEBUG_KMS("BXT BIOS forgot to set DDI_A_4_LANES for port A; fixing\n");
+ DRM_DEBUG_KMS("BIOS forgot to set DDI_A_4_LANES for port A\n");
intel_dig_port->saved_port_bits |= DDI_A_4_LANES;
max_lanes = 4;
}
--
2.13.5
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