[PATCH v8 5/5] drm/i915: Enable support for integrated privacy screen

[Rajat Jain]

Add support for an ACPI based integrated privacy screen that is
available on some systems.

Signed-off-by: Rajat Jain <rajatja@xxxxxxxxxx>
---
v8: - separate the APCI privacy screen into a separate patch.
    - Don't destroy the property if there is no privacy screen (because
      drm core doesn't like destroying property in late_register()).
    - The setting change needs to be committed in ->update_pipe() for 
      ddi.c as well as dp.c and both of them call intel_dp_add_properties()
v7: Look for ACPI node in ->late_register() hook.
    Do the scan only once per drm_device (instead of 1 per drm_connector)
v6: Addressed minor comments from Jani at
    https://lkml.org/lkml/2020/1/24/1143
     - local variable renamed.
     - used drm_dbg_kms()
     - used acpi_device_handle()
     - Used opaque type acpi_handle instead of void*
v5: same as v4
v4: Same as v3
v3: fold the code into existing acpi_device_id_update() function
v2: formed by splitting the original patch into ACPI lookup, and privacy
    screen property. Also move it into i915 now that I found existing code
    in i915 that can be re-used.

 drivers/gpu/drm/i915/display/intel_atomic.c |  2 ++
 drivers/gpu/drm/i915/display/intel_ddi.c    |  1 +
 drivers/gpu/drm/i915/display/intel_dp.c     | 34 ++++++++++++++++++++-
 drivers/gpu/drm/i915/display/intel_dp.h     |  5 +++
 4 files changed, 41 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/display/intel_atomic.c b/drivers/gpu/drm/i915/display/intel_atomic.c
index d043057d2fa03..9898d8980e7ce 100644
--- a/drivers/gpu/drm/i915/display/intel_atomic.c
+++ b/drivers/gpu/drm/i915/display/intel_atomic.c
@@ -150,6 +150,8 @@ int intel_digital_connector_atomic_check(struct drm_connector *conn,
 	    new_conn_state->base.picture_aspect_ratio != old_conn_state->base.picture_aspect_ratio ||
 	    new_conn_state->base.content_type != old_conn_state->base.content_type ||
 	    new_conn_state->base.scaling_mode != old_conn_state->base.scaling_mode ||
+	    new_conn_state->base.privacy_screen_status !=
+		old_conn_state->base.privacy_screen_status ||
 	    !blob_equal(new_conn_state->base.hdr_output_metadata,
 			old_conn_state->base.hdr_output_metadata))
 		crtc_state->mode_changed = true;
diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
index 73d0f4648c06a..69a5423216dc5 100644
--- a/drivers/gpu/drm/i915/display/intel_ddi.c
+++ b/drivers/gpu/drm/i915/display/intel_ddi.c
@@ -3708,6 +3708,7 @@ static void intel_ddi_update_pipe(struct intel_encoder *encoder,
 	if (!intel_crtc_has_type(crtc_state, INTEL_OUTPUT_HDMI))
 		intel_ddi_update_pipe_dp(encoder, crtc_state, conn_state);
 
+	intel_dp_update_privacy_screen(encoder, crtc_state, conn_state);
 	intel_hdcp_update_pipe(encoder, crtc_state, conn_state);
 }
 
diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index 3ddc424b028c1..5f33ebb466135 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -62,6 +62,7 @@
 #include "intel_lspcon.h"
 #include "intel_lvds.h"
 #include "intel_panel.h"
+#include "intel_privacy_screen.h"
 #include "intel_psr.h"
 #include "intel_sideband.h"
 #include "intel_tc.h"
@@ -5886,6 +5887,10 @@ intel_dp_connector_register(struct drm_connector *connector)
 		dev_priv->acpi_scan_done = true;
 	}
 
+	/* Check for integrated Privacy screen support */
+	if (intel_privacy_screen_present(to_intel_connector(connector)))
+		drm_connector_attach_privacy_screen_property(connector);
+
 	DRM_DEBUG_KMS("registering %s bus for %s\n",
 		      intel_dp->aux.name, connector->kdev->kobj.name);
 
@@ -6883,6 +6888,33 @@ intel_dp_add_properties(struct intel_dp *intel_dp, struct drm_connector *connect
 		connector->state->scaling_mode = DRM_MODE_SCALE_ASPECT;
 
 	}
+
+	/*
+	 * Created here, but depending on result of probing for privacy-screen
+	 * in intel_dp_connector_register(), gets attached in that function.
+	 * Need to create here because the drm core doesn't like creating
+	 * properties during ->late_register().
+	 */
+	drm_connector_create_privacy_screen_property(connector);
+}
+
+void
+intel_dp_update_privacy_screen(struct intel_encoder *encoder,
+			       const struct intel_crtc_state *crtc_state,
+			       const struct drm_connector_state *conn_state)
+{
+	struct drm_connector *connector = conn_state->connector;
+
+	intel_privacy_screen_set_val(to_intel_connector(connector),
+				     conn_state->privacy_screen_status);
+}
+
+static void intel_dp_update_pipe(struct intel_encoder *encoder,
+				 const struct intel_crtc_state *crtc_state,
+				 const struct drm_connector_state *conn_state)
+{
+	intel_dp_update_privacy_screen(encoder, crtc_state, conn_state);
+	intel_panel_update_backlight(encoder, crtc_state, conn_state);
 }
 
 static void intel_dp_init_panel_power_timestamps(struct intel_dp *intel_dp)
@@ -7826,7 +7858,7 @@ bool intel_dp_init(struct drm_i915_private *dev_priv,
 	intel_encoder->compute_config = intel_dp_compute_config;
 	intel_encoder->get_hw_state = intel_dp_get_hw_state;
 	intel_encoder->get_config = intel_dp_get_config;
-	intel_encoder->update_pipe = intel_panel_update_backlight;
+	intel_encoder->update_pipe = intel_dp_update_pipe;
 	intel_encoder->suspend = intel_dp_encoder_suspend;
 	if (IS_CHERRYVIEW(dev_priv)) {
 		intel_encoder->pre_pll_enable = chv_dp_pre_pll_enable;
diff --git a/drivers/gpu/drm/i915/display/intel_dp.h b/drivers/gpu/drm/i915/display/intel_dp.h
index 0c7be8ed1423a..e4594e27ce5a8 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.h
+++ b/drivers/gpu/drm/i915/display/intel_dp.h
@@ -123,4 +123,9 @@ static inline unsigned int intel_dp_unused_lane_mask(int lane_count)
 
 u32 intel_dp_mode_to_fec_clock(u32 mode_clock);
 
+void
+intel_dp_update_privacy_screen(struct intel_encoder *encoder,
+			       const struct intel_crtc_state *crtc_state,
+			       const struct drm_connector_state *conn_state);
+
 #endif /* __INTEL_DP_H__ */
-- 
2.25.1.481.gfbce0eb801-goog