At the moment intel_prepare_ddi buffer will iterate through both MST and CRT encoders, which is incorrect. Neither of these encoder types have an embedding intel_digital_port object, so for these encoder types we will use random data when dereferencing the corresponding intel_digital_port->port field.
Introduced in commit b403745c84592b26a0713e6944c2b109f6df5c82 Author: Damien Lespiau <damien.lesp...@intel.com> Date: Mon Aug 4 22:01:33 2014 +0100 drm/i915: Iterate through the initialized DDIs to prepare their buffers v2: - fix getting at the port for MST encoders too - make sure that intel_prepare_ddi_buffers() gets called for port E too (Paulo) Signed-off-by: Imre Deak <imre.d...@intel.com> --- drivers/gpu/drm/i915/i915_drv.h | 5 ----- drivers/gpu/drm/i915/intel_ddi.c | 28 ++++++++++++++++++---------- 2 files changed, 18 insertions(+), 15 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index 40ef672..c461b56 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -251,11 +251,6 @@ enum hpd_pin { &dev->mode_config.connector_list, \ base.head) -#define for_each_digital_port(dev, digital_port) \ - list_for_each_entry(digital_port, \ - &dev->mode_config.encoder_list, \ - base.base.head) - #define for_each_encoder_on_crtc(dev, __crtc, intel_encoder) \ list_for_each_entry((intel_encoder), &(dev)->mode_config.encoder_list, base.head) \ if ((intel_encoder)->base.crtc == (__crtc)) diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c index 903d395..9c1e74a 100644 --- a/drivers/gpu/drm/i915/intel_ddi.c +++ b/drivers/gpu/drm/i915/intel_ddi.c @@ -256,12 +256,11 @@ intel_dig_port_supports_hdmi(const struct intel_digital_port *intel_dig_port) * in either FDI or DP modes only, as HDMI connections will work with both * of those */ -static void intel_prepare_ddi_buffers(struct drm_device *dev, - struct intel_digital_port *intel_dig_port) +static void intel_prepare_ddi_buffers(struct drm_device *dev, enum port port, + bool supports_hdmi) { struct drm_i915_private *dev_priv = dev->dev_private; u32 reg; - int port = intel_dig_port->port; int i, n_hdmi_entries, n_dp_entries, n_edp_entries, hdmi_default_entry, size; int hdmi_level = dev_priv->vbt.ddi_port_info[port].hdmi_level_shift; @@ -272,7 +271,7 @@ static void intel_prepare_ddi_buffers(struct drm_device *dev, const struct ddi_buf_trans *ddi_translations; if (IS_BROXTON(dev)) { - if (!intel_dig_port_supports_hdmi(intel_dig_port)) + if (!supports_hdmi) return; /* Vswing programming for HDMI */ @@ -360,7 +359,7 @@ static void intel_prepare_ddi_buffers(struct drm_device *dev, reg += 4; } - if (!intel_dig_port_supports_hdmi(intel_dig_port)) + if (!supports_hdmi) return; /* Choose a good default if VBT is badly populated */ @@ -380,18 +379,27 @@ static void intel_prepare_ddi_buffers(struct drm_device *dev, */ void intel_prepare_ddi(struct drm_device *dev) { - struct intel_digital_port *intel_dig_port; + struct intel_encoder *intel_encoder; bool visited[I915_MAX_PORTS] = { 0, }; if (!HAS_DDI(dev)) return; - for_each_digital_port(dev, intel_dig_port) { - if (visited[intel_dig_port->port]) + for_each_intel_encoder(dev, intel_encoder) { + struct intel_digital_port *intel_dig_port; + enum port port; + bool supports_hdmi; + + ddi_get_encoder_port(intel_encoder, &intel_dig_port, &port); + + if (visited[port]) continue; - intel_prepare_ddi_buffers(dev, intel_dig_port); - visited[intel_dig_port->port] = true; + supports_hdmi = intel_dig_port && + intel_dig_port_supports_hdmi(intel_dig_port); + + intel_prepare_ddi_buffers(dev, port, supports_hdmi); + visited[port] = true; } } -- 2.1.0 _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/intel-gfx