RE: [Intel-gfx] [PATCH v6 02/10] drm/hdcp: Avoid changing crtc state in hdcp atomic check

From: Kandpal, Suraj
Date: Fri Mar 10 2023 - 01:01:30 EST

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> -----Original Message-----
> From: Intel-gfx <intel-gfx-bounces@xxxxxxxxxxxxxxxxxxxxx> On Behalf Of Mark
> Yacoub
> Sent: Thursday, January 19, 2023 1:00 AM
> To: quic_khsieh@xxxxxxxxxxx; linux-arm-msm@xxxxxxxxxxxxxxx; dri-
> devel@xxxxxxxxxxxxxxxxxxxxx; freedreno@xxxxxxxxxxxxxxxxxxxxx;
> devicetree@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; intel-
> gfx@xxxxxxxxxxxxxxxxxxxxx
> Cc: quic_sbillaka@xxxxxxxxxxx; konrad.dybcio@xxxxxxxxxxxxxx;
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> abhinavk@xxxxxxxxxxxxxx; javierm@xxxxxxxxxx; agross@xxxxxxxxxx;
> quic_jesszhan@xxxxxxxxxxx; daniel@xxxxxxxx; Nikula, Jani
> <jani.nikula@xxxxxxxxx>; De Marchi, Lucas <lucas.demarchi@xxxxxxxxx>;
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> dmitry.baryshkov@xxxxxxxxxx; seanpaul@xxxxxxxxxxxx
> Subject: [Intel-gfx] [PATCH v6 02/10] drm/hdcp: Avoid changing crtc state in
> hdcp atomic check
>
> From: Sean Paul <seanpaul@xxxxxxxxxxxx>
>
> Instead of forcing a modeset in the hdcp atomic check, simply 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@xxxxxxxxx>
> Reviewed-by: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
> Signed-off-by: Sean Paul <seanpaul@xxxxxxxxxxxx>
> Signed-off-by: Mark Yacoub <markyacoub@xxxxxxxxxxxx>
> Link:
> https://patchwork.freedesktop.org/patch/msgid/20210913175747.47456-3-
> sean@xxxxxxxxxx #v1
> Link:
> https://patchwork.freedesktop.org/patch/msgid/20210915203834.1439-3-
> sean@xxxxxxxxxx #v2
> Link:
> https://patchwork.freedesktop.org/patch/msgid/20211001151145.55916-3-
> sean@xxxxxxxxxx #v3
> Link:
> https://patchwork.freedesktop.org/patch/msgid/20211105030434.2828845-
> 3-sean@xxxxxxxxxx #v4
> Link:
> https://patchwork.freedesktop.org/patch/msgid/20220411204741.1074308-
> 3-sean@xxxxxxxxxx #v5
>
> 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
>
> ---
> drivers/gpu/drm/display/drm_hdcp_helper.c | 33 +++++++++++++++------
> drivers/gpu/drm/i915/display/intel_atomic.c | 6 ++--
> include/drm/display/drm_hdcp_helper.h | 2 +-
> 3 files changed, 27 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/gpu/drm/display/drm_hdcp_helper.c
> b/drivers/gpu/drm/display/drm_hdcp_helper.c
> index 7d910523b05f..a3896b0904b5 100644
> --- a/drivers/gpu/drm/display/drm_hdcp_helper.c
> +++ b/drivers/gpu/drm/display/drm_hdcp_helper.c
> @@ -428,11 +428,14 @@
> EXPORT_SYMBOL(drm_hdcp_update_content_protection);
> * @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,
> +bool drm_hdcp_atomic_check(struct drm_connector *connector,
> struct drm_atomic_state *state)
> {
> struct drm_connector_state *new_conn_state, *old_conn_state;
> @@ -450,10 +453,12 @@ 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 =
> @@ -465,9 +470,19 @@ void drm_hdcp_atomic_check(struct
> drm_connector *connector,
> */
> 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 disable or changing CRTC with DESIRED state
> requires
> + * that the driver try CP enable.
> + */

Hi ,
We can have a clearer comment which says something like "Coming back from
UNDESIRED state, CRTC change or re-enablement requires the driver to try CP enable"

Regards,
Suraj Kandpal
> + 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:
> @@ -482,9 +497,9 @@ 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);
> diff --git a/drivers/gpu/drm/i915/display/intel_atomic.c
> b/drivers/gpu/drm/i915/display/intel_atomic.c
> index 8a473199c4bf..a2067cbae2d5 100644
> --- a/drivers/gpu/drm/i915/display/intel_atomic.c
> +++ b/drivers/gpu/drm/i915/display/intel_atomic.c
> @@ -123,8 +123,6 @@ 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;
>
> @@ -140,8 +138,8 @@ 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_atomic_check(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 dd02b2e72a50..cb2cc5002f65 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_atomic_check(struct drm_connector *connector,
> struct drm_atomic_state *state);
>
> #endif
> --
> 2.39.0.246.g2a6d74b583-goog

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