diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index ad03db4b7a5b6ef52d46976a51be9aad972e8b3f..090ba2dba6966396b3093dcaa3ac74c41781fe37 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -7602,6 +7602,33 @@ intel_connector_break_all_links(struct intel_connector *connector) connector->encoder->base.crtc = NULL; } +static void intel_enable_pipe_a(struct drm_device *dev) +{ + struct intel_connector *connector; + struct drm_connector *crt = NULL; + struct intel_load_detect_pipe load_detect_temp; + + /* We can't just switch on the pipe A, we need to set things up with a + * proper mode and output configuration. As a gross hack, enable pipe A + * by enabling the load detect pipe once. */ + list_for_each_entry(connector, + &dev->mode_config.connector_list, + base.head) { + if (connector->encoder->type == INTEL_OUTPUT_ANALOG) { + crt = &connector->base; + break; + } + } + + if (!crt) + return; + + if (intel_get_load_detect_pipe(crt, NULL, &load_detect_temp)) + intel_release_load_detect_pipe(crt, &load_detect_temp); + + +} + static void intel_sanitize_crtc(struct intel_crtc *crtc) { struct drm_device *dev = crtc->base.dev; @@ -7650,6 +7677,15 @@ static void intel_sanitize_crtc(struct intel_crtc *crtc) } ok: + if (dev_priv->quirks & QUIRK_PIPEA_FORCE && + crtc->pipe == PIPE_A && !crtc->active) { + /* BIOS forgot to enable pipe A, this mostly happens after + * resume. Force-enable the pipe to fix this, the update_dpms + * call below we restore the pipe to the right state, but leave + * the required bits on. */ + intel_enable_pipe_a(dev); + } + /* Adjust the state of the output pipe according to whether we * have active connectors/encoders. */ intel_crtc_update_dpms(&crtc->base);