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Message-ID: <20230419154321.1993419-3-markyacoub@google.com>
Date: Wed, 19 Apr 2023 11:43:12 -0400
From: Mark Yacoub <markyacoub@...omium.org>
To: David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
Jani Nikula <jani.nikula@...ux.intel.com>,
Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
Rodrigo Vivi <rodrigo.vivi@...el.com>,
Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>
Cc: seanpaul@...omium.org, suraj.kandpal@...el.com,
dianders@...omium.org, dmitry.baryshkov@...aro.org,
dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
intel-gfx@...ts.freedesktop.org,
Jani Nikula <jani.nikula@...el.com>,
Mark Yacoub <markyacoub@...omium.org>,
linux-kernel@...r.kernel.org
Subject: [PATCH v10 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;
}
-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
--
2.40.0.634.g4ca3ef3211-goog
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