On Fri, Oct 29, 2021 at 10:18:02PM +0300, Ville Syrjala wrote:

From: Ville Syrjälä ville.syrjala@linux.intel.com

Looks like our VBIOS/GOP generally fail to turn the DP dual mode adater TMDS output buffers back on after a reboot. This leads to a black screen after reboot if we turned the TMDS output buffers off prior to reboot. And if i915 decides to do a fastboot the black screen will persist even after i915 takes over.

Apparently this has been a problem ever since commit b2ccb822d376 ("drm/i915: Enable/disable TMDS output buffers in DP++ adaptor as needed") if one rebooted while the display was turned off. And things became worse with commit fe0f1e3bfdfe ("drm/i915: Shut down displays gracefully on reboot") since now we always turn the display off before a reboot.

This was reported on a RKL, but I confirmed the same behaviour on my SNB as well. So looks pretty universal.

Let's fix this by explicitly turning the TMDS output buffers back on in the encoder->shutdown() hook. Note that this gets called after irqs have been disabled, so the i2c communication with the DP dual mode adapter has to be performed via polling (which the gmbus code is perfectly happy to do for us).

We also need a bit of care in handling DDI encoders which may or may not be set up for HDMI output. Specifically ddc_pin will not be populated for a DP only DDI encoder, in which case we don't want to call intel_gmbus_get_adapter(). We can handle that by simply doing the dual mode adapter type check before calling intel_gmbus_get_adapter().

Reviewed-by: Stanislav Lisovskiy stanislav.lisovskiy@intel.com

Cc: stable@vger.kernel.org Fixes: b2ccb822d376 ("drm/i915: Enable/disable TMDS output buffers in DP++ adaptor as needed") Fixes: fe0f1e3bfdfe ("drm/i915: Shut down displays gracefully on reboot") Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/4371 Signed-off-by: Ville Syrjälä ville.syrjala@linux.intel.com

---

drivers/gpu/drm/i915/display/g4x_hdmi.c | 1 + drivers/gpu/drm/i915/display/intel_ddi.c | 1 + drivers/gpu/drm/i915/display/intel_hdmi.c | 16 ++++++++++++++-- drivers/gpu/drm/i915/display/intel_hdmi.h | 1 + 4 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/g4x_hdmi.c b/drivers/gpu/drm/i915/display/g4x_hdmi.c index 88c427f3c346..f5b4dd5b4275 100644 --- a/drivers/gpu/drm/i915/display/g4x_hdmi.c +++ b/drivers/gpu/drm/i915/display/g4x_hdmi.c @@ -584,6 +584,7 @@ void g4x_hdmi_init(struct drm_i915_private *dev_priv, else intel_encoder->enable = g4x_enable_hdmi; }

• intel_encoder->shutdown = intel_hdmi_encoder_shutdown;

intel_encoder->type = INTEL_OUTPUT_HDMI; intel_encoder->power_domain = intel_port_to_power_domain(port); diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c index 9fb99b09fff8..5ef2882727e1 100644 --- a/drivers/gpu/drm/i915/display/intel_ddi.c +++ b/drivers/gpu/drm/i915/display/intel_ddi.c @@ -4312,6 +4312,7 @@ static void intel_ddi_encoder_shutdown(struct intel_encoder *encoder) enum phy phy = intel_port_to_phy(i915, encoder->port); intel_dp_encoder_shutdown(encoder);

• intel_hdmi_encoder_shutdown(encoder);

if (!intel_phy_is_tc(i915, phy)) return; diff --git a/drivers/gpu/drm/i915/display/intel_hdmi.c b/drivers/gpu/drm/i915/display/intel_hdmi.c index 7e6af959bf83..3b5b9e7b05b7 100644 --- a/drivers/gpu/drm/i915/display/intel_hdmi.c +++ b/drivers/gpu/drm/i915/display/intel_hdmi.c @@ -1246,12 +1246,13 @@ static void hsw_set_infoframes(struct intel_encoder *encoder, void intel_dp_dual_mode_set_tmds_output(struct intel_hdmi *hdmi, bool enable) { struct drm_i915_private *dev_priv = intel_hdmi_to_i915(hdmi);

• struct i2c_adapter *adapter =

• intel_gmbus_get_adapter(dev_priv, hdmi->ddc_bus);
  

• struct i2c_adapter *adapter;

if (hdmi->dp_dual_mode.type < DRM_DP_DUAL_MODE_TYPE2_DVI) return;

• adapter = intel_gmbus_get_adapter(dev_priv, hdmi->ddc_bus);
• drm_dbg_kms(&dev_priv->drm, "%s DP dual mode adaptor TMDS output\n", enable ? "Enabling" : "Disabling");

@@ -2285,6 +2286,17 @@ int intel_hdmi_compute_config(struct intel_encoder *encoder, return 0; } +void intel_hdmi_encoder_shutdown(struct intel_encoder *encoder) +{

• struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(encoder);
• /*

• * Give a hand to buggy BIOSen which forget to turn
  

• * the TMDS output buffers back on after a reboot.
  

• */
  

• intel_dp_dual_mode_set_tmds_output(intel_hdmi, true);

+}

static void intel_hdmi_unset_edid(struct drm_connector *connector) { diff --git a/drivers/gpu/drm/i915/display/intel_hdmi.h b/drivers/gpu/drm/i915/display/intel_hdmi.h index b43a180d007e..2bf440eb400a 100644 --- a/drivers/gpu/drm/i915/display/intel_hdmi.h +++ b/drivers/gpu/drm/i915/display/intel_hdmi.h @@ -28,6 +28,7 @@ void intel_hdmi_init_connector(struct intel_digital_port *dig_port, int intel_hdmi_compute_config(struct intel_encoder *encoder, struct intel_crtc_state *pipe_config, struct drm_connector_state *conn_state); +void intel_hdmi_encoder_shutdown(struct intel_encoder *encoder); bool intel_hdmi_handle_sink_scrambling(struct intel_encoder *encoder, struct drm_connector *connector, bool high_tmds_clock_ratio, -- 2.32.0