[PATCH 10/10] drm/i915: Add privacy-screen support (v3)

[Hans de Goede]

Add support for eDP panels with a built-in privacy screen using the
new drm_privacy_screen class.

Changes in v3:
- Move drm_privacy_screen_get() call to intel_ddi_init_dp_connector()

Changes in v2:
- Call drm_connector_update_privacy_screen() from
  intel_enable_ddi_dp() / intel_ddi_update_pipe_dp() instead of adding a
  for_each_new_connector_in_state() loop to intel_atomic_commit_tail()
- Move the probe-deferral check to the intel_modeset_probe_defer() helper

Signed-off-by: Hans de Goede <hdego...@redhat.com>
---
 drivers/gpu/drm/i915/display/intel_atomic.c  |  1 +
 drivers/gpu/drm/i915/display/intel_ddi.c     | 16 ++++++++++++++++
 drivers/gpu/drm/i915/display/intel_display.c | 10 ++++++++++
 3 files changed, 27 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_atomic.c 
b/drivers/gpu/drm/i915/display/intel_atomic.c
index b4e7ac51aa31..a62550711e98 100644
--- a/drivers/gpu/drm/i915/display/intel_atomic.c
+++ b/drivers/gpu/drm/i915/display/intel_atomic.c
@@ -139,6 +139,7 @@ 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_sw_state != 
old_conn_state->base.privacy_screen_sw_state ||
            !drm_connector_atomic_hdr_metadata_equal(old_state, new_state))
                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 0d4cf7fa8720..272714e07cc6 100644
--- a/drivers/gpu/drm/i915/display/intel_ddi.c
+++ b/drivers/gpu/drm/i915/display/intel_ddi.c
@@ -25,6 +25,7 @@
  *
  */
 
+#include <drm/drm_privacy_screen_consumer.h>
 #include <drm/drm_scdc_helper.h>
 
 #include "i915_drv.h"
@@ -2946,6 +2947,7 @@ static void intel_enable_ddi_dp(struct intel_atomic_state 
*state,
        if (port == PORT_A && DISPLAY_VER(dev_priv) < 9)
                intel_dp_stop_link_train(intel_dp, crtc_state);
 
+       drm_connector_update_privacy_screen(conn_state);
        intel_edp_backlight_on(crtc_state, conn_state);
 
        if (!dig_port->lspcon.active || dig_port->dp.has_hdmi_sink)
@@ -3161,6 +3163,7 @@ static void intel_ddi_update_pipe_dp(struct 
intel_atomic_state *state,
        intel_drrs_update(intel_dp, crtc_state);
 
        intel_backlight_update(state, encoder, crtc_state, conn_state);
+       drm_connector_update_privacy_screen(conn_state);
 }
 
 void intel_ddi_update_pipe(struct intel_atomic_state *state,
@@ -3979,6 +3982,19 @@ intel_ddi_init_dp_connector(struct intel_digital_port 
*dig_port)
                return NULL;
        }
 
+       if (dig_port->base.type == INTEL_OUTPUT_EDP) {
+               struct drm_device *dev = dig_port->base.base.dev;
+               struct drm_privacy_screen *privacy_screen;
+
+               privacy_screen = drm_privacy_screen_get(dev->dev, NULL);
+               if (!IS_ERR(privacy_screen)) {
+                       
drm_connector_attach_privacy_screen_provider(&connector->base,
+                                                                    
privacy_screen);
+               } else if (PTR_ERR(privacy_screen) != -ENODEV) {
+                       drm_warn(dev, "Error getting privacy-screen\n");
+               }
+       }
+
        return connector;
 }
 
diff --git a/drivers/gpu/drm/i915/display/intel_display.c 
b/drivers/gpu/drm/i915/display/intel_display.c
index 86dbe366a907..84715a779d9d 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -42,6 +42,7 @@
 #include <drm/drm_edid.h>
 #include <drm/drm_fourcc.h>
 #include <drm/drm_plane_helper.h>
+#include <drm/drm_privacy_screen_consumer.h>
 #include <drm/drm_probe_helper.h>
 #include <drm/drm_rect.h>
 
@@ -12769,6 +12770,8 @@ void intel_modeset_driver_remove_nogem(struct 
drm_i915_private *i915)
 
 bool intel_modeset_probe_defer(struct pci_dev *pdev)
 {
+       struct drm_privacy_screen *privacy_screen;
+
        /*
         * apple-gmux is needed on dual GPU MacBook Pro
         * to probe the panel if we're the inactive GPU.
@@ -12776,6 +12779,13 @@ bool intel_modeset_probe_defer(struct pci_dev *pdev)
        if (vga_switcheroo_client_probe_defer(pdev))
                return true;
 
+       /* If the LCD panel has a privacy-screen, wait for it */
+       privacy_screen = drm_privacy_screen_get(&pdev->dev, NULL);
+       if (IS_ERR(privacy_screen) && PTR_ERR(privacy_screen) == -EPROBE_DEFER)
+               return true;
+
+       drm_privacy_screen_put(privacy_screen);
+
        return false;
 }
 
-- 
2.31.1