[PATCH 10/10] drm/i915: Add privacy-screen support (v2)

[Ville Syrjälä]

On Sat, Oct 02, 2021 at 06:36:18PM +0200, Hans de Goede wrote:
> Add support for eDP panels with a built-in privacy screen using the
> new drm_privacy_screen class.
> 
> 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 <hdegoede at redhat.com>
> ---
>  drivers/gpu/drm/i915/display/intel_atomic.c  |  1 +
>  drivers/gpu/drm/i915/display/intel_ddi.c     |  3 +++
>  drivers/gpu/drm/i915/display/intel_display.c | 10 ++++++++++
>  drivers/gpu/drm/i915/display/intel_dp.c      | 10 ++++++++++
>  4 files changed, 24 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 51cd0420e00e..e4496c830a35 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"
> @@ -3022,6 +3023,7 @@ 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)
> @@ -3247,6 +3249,7 @@ 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,
> diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
> index e67f3207ba54..9a5dbe51458d 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>
>  #include <drm/drm_drv.h>
> @@ -12693,6 +12694,8 @@ 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.
> @@ -12700,6 +12703,13 @@ 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;
>  }
>  
> diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
> index 74a657ae131a..91207310dc0d 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp.c
> @@ -37,6 +37,7 @@
>  #include <drm/drm_crtc.h>
>  #include <drm/drm_dp_helper.h>
>  #include <drm/drm_edid.h>
> +#include <drm/drm_privacy_screen_consumer.h>
>  #include <drm/drm_probe_helper.h>
>  
>  #include "g4x_dp.h"
> @@ -4808,6 +4809,7 @@ static bool intel_edp_init_connector(struct intel_dp *intel_dp,
>  	struct drm_connector *connector = &intel_connector->base;
>  	struct drm_display_mode *fixed_mode = NULL;
>  	struct drm_display_mode *downclock_mode = NULL;
> +	struct drm_privacy_screen *privacy_screen;
>  	bool has_dpcd;
>  	enum pipe pipe = INVALID_PIPE;
>  	struct edid *edid;
> @@ -4902,6 +4904,14 @@ static bool intel_edp_init_connector(struct intel_dp *intel_dp,
>  				fixed_mode->hdisplay, fixed_mode->vdisplay);
>  	}
>  
> +	privacy_screen = drm_privacy_screen_get(dev->dev, NULL);
> +	if (!IS_ERR(privacy_screen)) {
> +		drm_connector_attach_privacy_screen_provider(connector,
> +							     privacy_screen);
> +	} else if (PTR_ERR(privacy_screen) != -ENODEV) {
> +		drm_warn(&dev_priv->drm, "Error getting privacy-screen\n");
> +	}

I'm thinking this should go into intel_ddi_init_dp_connector()
on account of only the ddi codepaths having the
drm_connector_update_privacy_screen() calls.

Otherwise seems ok.

> +
>  	return true;
>  
>  out_vdd_off:
> -- 
> 2.31.1

-- 
Ville Syrjälä
Intel