diff options
| -rw-r--r-- | drivers/gpu/drm/i915/intel_display.c | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index 910df02..6289bab 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -10153,6 +10153,48 @@ static bool check_encoder_cloning(struct intel_crtc *crtc) return true; } +static bool check_digital_port_conflicts(struct drm_device *dev) +{ + struct intel_connector *connector; + unsigned int used_ports = 0; + + /* + * Walk the connector list instead of the encoder + * list to detect the problem on ddi platforms + * where there's just one encoder per digital port. + */ + list_for_each_entry(connector, + &dev->mode_config.connector_list, base.head) { + struct intel_encoder *encoder = connector->new_encoder; + + if (!encoder) + continue; + + WARN_ON(!encoder->new_crtc); + + switch (encoder->type) { + unsigned int port_mask; + case INTEL_OUTPUT_UNKNOWN: + if (WARN_ON(!HAS_DDI(dev))) + break; + case INTEL_OUTPUT_DISPLAYPORT: + case INTEL_OUTPUT_HDMI: + case INTEL_OUTPUT_EDP: + port_mask = 1 << enc_to_dig_port(&encoder->base)->port; + + /* the same port mustn't appear more than once */ + if (used_ports & port_mask) + return false; + + used_ports |= port_mask; + default: + break; + } + } + + return true; +} + static struct intel_crtc_config * intel_modeset_pipe_config(struct drm_crtc *crtc, struct drm_framebuffer *fb, @@ -10169,6 +10211,11 @@ intel_modeset_pipe_config(struct drm_crtc *crtc, return ERR_PTR(-EINVAL); } + if (!check_digital_port_conflicts(dev)) { + DRM_DEBUG_KMS("rejecting conflicting digital port configuration\n"); + return ERR_PTR(-EINVAL); + } + pipe_config = kzalloc(sizeof(*pipe_config), GFP_KERNEL); if (!pipe_config) return ERR_PTR(-ENOMEM); |