On Mon, Apr 11, 2022 at 08:47:32PM +0000, Sean Paul wrote: > From: Sean Paul <seanpaul@xxxxxxxxxxxx> > > This patch updates the connector's property value in 2 cases which were > previously missed: > > 1- Content type changes. The value should revert back to DESIRED from > ENABLED in case the driver must re-authenticate the link due to the > new content type. > > 2- Userspace sets value to DESIRED while ENABLED. In this case, the > value should be reset immediately to ENABLED since the link is > actively being encrypted. > > To accommodate these changes, I've split up the conditionals to make > things a bit more clear (as much as one can with this mess of state). > > Acked-by: Jani Nikula <jani.nikula@xxxxxxxxx> > Reviewed-by: Abhinav Kumar <abhinavk@xxxxxxxxxxxxxx> > Signed-off-by: Sean Paul <seanpaul@xxxxxxxxxxxx> > Link: https://patchwork.freedesktop.org/patch/msgid/20210913175747.47456-4-sean@xxxxxxxxxx #v1 > Link: https://patchwork.freedesktop.org/patch/msgid/20210915203834.1439-4-sean@xxxxxxxxxx #v2 > Link: https://patchwork.freedesktop.org/patch/msgid/20211001151145.55916-4-sean@xxxxxxxxxx #v3 > Link: https://patchwork.freedesktop.org/patch/msgid/20211105030434.2828845-4-sean@xxxxxxxxxx #v4 > > Changes in v2: > -None > Changes in v3: > -Fixed indentation issue identified by 0-day > Changes in v4: > -None > Changes in v5: > -None > --- > drivers/gpu/drm/drm_hdcp.c | 26 +++++++++++++++++--------- > 1 file changed, 17 insertions(+), 9 deletions(-) > > diff --git a/drivers/gpu/drm/drm_hdcp.c b/drivers/gpu/drm/drm_hdcp.c > index dd8fa91c51d6..8c851d40cd45 100644 > --- a/drivers/gpu/drm/drm_hdcp.c > +++ b/drivers/gpu/drm/drm_hdcp.c > @@ -487,21 +487,29 @@ bool drm_hdcp_atomic_check(struct drm_connector *connector, > return true; > > /* > - * Nothing to do if content type is unchanged and one of: > - * - state didn't change > + * Content type changes require an HDCP disable/enable cycle. > + */ > + if (new_conn_state->hdcp_content_type != old_conn_state->hdcp_content_type) { shouldn't we add some && ( old_hdcp == DRM_MODE_CONTENT_PROTECTION_ENABLED)) { here? > + new_conn_state->content_protection = > + DRM_MODE_CONTENT_PROTECTION_DESIRED; > + return true; > + } > + > + /* > + * Ignore meaningless state changes: > * - HDCP was activated since the last commit > - * - attempting to set to desired while already enabled > + * - Attempting to set to desired while already enabled > */ > - if (old_hdcp == new_hdcp || > - (old_hdcp == DRM_MODE_CONTENT_PROTECTION_DESIRED && > + if ((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)) { > - if (old_conn_state->hdcp_content_type == > - new_conn_state->hdcp_content_type) > - return false; > + new_conn_state->content_protection = > + DRM_MODE_CONTENT_PROTECTION_ENABLED; > + return false; > } > > - return true; > + /* Finally, if state changes, we need action */ > + return old_hdcp != new_hdcp; > } > EXPORT_SYMBOL(drm_hdcp_atomic_check); > -- > Sean Paul, Software Engineer, Google / Chromium OS >
