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Message-ID: <SN7PR11MB67504334854153E6EB3EF9ECE39D9@SN7PR11MB6750.namprd11.prod.outlook.com>
Date: Tue, 18 Apr 2023 05:37:33 +0000
From: "Kandpal, Suraj" <suraj.kandpal@...el.com>
To: Mark Yacoub <markyacoub@...omium.org>,
David Airlie <airlied@...il.com>,
Daniel Vetter <daniel@...ll.ch>,
Jani Nikula <jani.nikula@...ux.intel.com>,
Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
"Vivi, Rodrigo" <rodrigo.vivi@...el.com>,
Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>
CC: "seanpaul@...omium.org" <seanpaul@...omium.org>,
"dianders@...omium.org" <dianders@...omium.org>,
"dmitry.baryshkov@...aro.org" <dmitry.baryshkov@...aro.org>,
"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
"freedreno@...ts.freedesktop.org" <freedreno@...ts.freedesktop.org>,
"intel-gfx@...ts.freedesktop.org" <intel-gfx@...ts.freedesktop.org>,
"Nikula, Jani" <jani.nikula@...el.com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v9 02/10] drm/hdcp: Avoid changing crtc state in hdcp
atomic check
>
> From: Sean Paul <seanpaul@...omium.org>
>
> Instead of forcing a modeset in the hdcp atomic check, rename to
> drm_hdcp_has_changed and return true if the content protection value is
> changing and let the driver decide whether a modeset is required or not.
>
> Acked-by: Jani Nikula <jani.nikula@...el.com>
> Reviewed-by: Rodrigo Vivi <rodrigo.vivi@...el.com>
> Signed-off-by: Sean Paul <seanpaul@...omium.org>
> Signed-off-by: Mark Yacoub <markyacoub@...omium.org>
>
> ---
> Changes in v2:
> -None
> Changes in v3:
> -None
> Changes in v4:
> -None
> Changes in v5:
> -None
> Changes in v6:
> -Rebase: modifications in drm_hdcp_helper.c instead of drm_hdcp.c
> Changes in v7:
> -Renamed the function from drm_hdcp_atomic_check to
> drm_hdcp_has_changed (Dmitry Baryshkov)
>
> drivers/gpu/drm/display/drm_hdcp_helper.c | 39 ++++++++++++++-------
> drivers/gpu/drm/i915/display/intel_atomic.c | 6 ++--
> include/drm/display/drm_hdcp_helper.h | 2 +-
> 3 files changed, 30 insertions(+), 17 deletions(-)
>
> diff --git a/drivers/gpu/drm/display/drm_hdcp_helper.c
> b/drivers/gpu/drm/display/drm_hdcp_helper.c
> index 7ca390b3ea106..34baf2b97cd87 100644
> --- a/drivers/gpu/drm/display/drm_hdcp_helper.c
> +++ b/drivers/gpu/drm/display/drm_hdcp_helper.c
> @@ -422,18 +422,21 @@ void drm_hdcp_update_content_protection(struct
> drm_connector *connector,
> EXPORT_SYMBOL(drm_hdcp_update_content_protection);
>
> /**
> - * drm_hdcp_atomic_check - Helper for drivers to call during connector-
> >atomic_check
> + * drm_hdcp_has_changed - Helper for drivers to call during
> + connector->atomic_check
> *
> * @state: pointer to the atomic state being checked
> * @connector: drm_connector on which content protection state needs an
> update
> *
> * This function can be used by display drivers to perform an atomic check
> on the
> - * hdcp state elements. If hdcp state has changed, this function will set
> - * mode_changed on the crtc driving the connector so it can update its
> hardware
> - * to match the hdcp state.
> + * hdcp state elements. If hdcp state has changed in a manner which
> + requires the
> + * driver to enable or disable content protection, this function will
> + return
> + * true.
> + *
> + * Returns:
> + * true if the driver must enable/disable hdcp, false otherwise
> */
> -void drm_hdcp_atomic_check(struct drm_connector *connector,
> - struct drm_atomic_state *state)
> +bool drm_hdcp_has_changed(struct drm_connector *connector,
> + struct drm_atomic_state *state)
> {
> struct drm_connector_state *new_conn_state, *old_conn_state;
> struct drm_crtc_state *new_crtc_state; @@ -450,19 +453,31 @@
> void drm_hdcp_atomic_check(struct drm_connector *connector,
> * If the connector is being disabled with CP enabled, mark it
> * desired so it's re-enabled when the connector is brought
> back
> */
> - if (old_hdcp ==
> DRM_MODE_CONTENT_PROTECTION_ENABLED)
> + if (old_hdcp ==
> DRM_MODE_CONTENT_PROTECTION_ENABLED) {
> new_conn_state->content_protection =
>
> DRM_MODE_CONTENT_PROTECTION_DESIRED;
> - return;
> + return true;
> + }
> + return false;
> }
>
> new_crtc_state =
> drm_atomic_get_new_crtc_state(state, new_conn_state-
> >crtc);
> if (drm_atomic_crtc_needs_modeset(new_crtc_state) &&
> (old_hdcp == DRM_MODE_CONTENT_PROTECTION_ENABLED &&
> - new_hdcp != DRM_MODE_CONTENT_PROTECTION_UNDESIRED))
> + new_hdcp != DRM_MODE_CONTENT_PROTECTION_UNDESIRED))
> {
> new_conn_state->content_protection =
> DRM_MODE_CONTENT_PROTECTION_DESIRED;
> + return true;
> + }
> +
> + /*
> + * Coming back from UNDESIRED state, CRTC change or re-
> enablement requires
> + * the driver to try CP enable.
> + */
> + if (new_hdcp == DRM_MODE_CONTENT_PROTECTION_DESIRED &&
> + new_conn_state->crtc != old_conn_state->crtc)
> + return true;
>
> /*
> * Nothing to do if content type is unchanged and one of:
> @@ -477,9 +492,9 @@ void drm_hdcp_atomic_check(struct drm_connector
> *connector,
> new_hdcp == DRM_MODE_CONTENT_PROTECTION_DESIRED)) {
> if (old_conn_state->hdcp_content_type ==
> new_conn_state->hdcp_content_type)
> - return;
> + return false;
> }
>
> - new_crtc_state->mode_changed = true;
> + return true;
> }
So previously in hdcp_atomic_check we decided if a mode change was required only after going through two different checks
if (drm_atomic_crtc_needs_modeset(new_crtc_state) &&
(old_hdcp == DRM_MODE_CONTENT_PROTECTION_ENABLED &&
new_hdcp != DRM_MODE_CONTENT_PROTECTION_UNDESIRED))
and
if (old_hdcp == new_hdcp ||
(old_hdcp == DRM_MODE_CONTENT_PROTECTION_DESIRED &&
new_hdcp == DRM_MODE_CONTENT_PROTECTION_ENABLED) ||
(old_hdcp == DRM_MODE_CONTENT_PROTECTION_ENABLED &&
new_hdcp == DRM_MODE_CONTENT_PROTECTION_DESIRED))
then we decided if mode needs to change or not but now we are returning mode_changed
as true if either of the conditions are met
maybe we can have a bool variable that gets assigned true or false and is returned only at the end
of the function where we previously changed mode_changed to true
Regards,
Suraj Kandpal
> -EXPORT_SYMBOL(drm_hdcp_atomic_check);
> +EXPORT_SYMBOL(drm_hdcp_has_changed);
> diff --git a/drivers/gpu/drm/i915/display/intel_atomic.c
> b/drivers/gpu/drm/i915/display/intel_atomic.c
> index e9d00b6a63d39..23a6ba315a22e 100644
> --- a/drivers/gpu/drm/i915/display/intel_atomic.c
> +++ b/drivers/gpu/drm/i915/display/intel_atomic.c
> @@ -124,8 +124,6 @@ int intel_digital_connector_atomic_check(struct
> drm_connector *conn,
> to_intel_digital_connector_state(old_state);
> struct drm_crtc_state *crtc_state;
>
> - drm_hdcp_atomic_check(conn, state);
> -
> if (!new_state->crtc)
> return 0;
>
> @@ -141,8 +139,8 @@ 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_sw_state !=
> old_conn_state->base.privacy_screen_sw_state ||
> - !drm_connector_atomic_hdr_metadata_equal(old_state,
> new_state))
> + !drm_connector_atomic_hdr_metadata_equal(old_state,
> new_state) ||
> + drm_hdcp_has_changed(conn, state))
> crtc_state->mode_changed = true;
>
> return 0;
> diff --git a/include/drm/display/drm_hdcp_helper.h
> b/include/drm/display/drm_hdcp_helper.h
> index dd02b2e72a502..703421fcdf96c 100644
> --- a/include/drm/display/drm_hdcp_helper.h
> +++ b/include/drm/display/drm_hdcp_helper.h
> @@ -19,7 +19,7 @@ int drm_hdcp_check_ksvs_revoked(struct drm_device
> *dev, u8 *ksvs, u32 ksv_count) int
> drm_connector_attach_content_protection_property(struct drm_connector
> *connector,
> bool hdcp_content_type);
> void drm_hdcp_update_content_protection(struct drm_connector
> *connector, u64 val); -void drm_hdcp_atomic_check(struct drm_connector
> *connector,
> +bool drm_hdcp_has_changed(struct drm_connector *connector,
> struct drm_atomic_state *state);
>
> #endif
> --
> 2.40.0.577.gac1e443424-goog
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