We recently added some infrastructure to deal with HDMI but we're still lacking a couple of things. Add a TODO entry with the remaining items. Cc: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx> Signed-off-by: Maxime Ripard <mripard@xxxxxxxxxx> --- Changes from v1: - Add sound and HDCP --- Documentation/gpu/todo.rst | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+) diff --git a/Documentation/gpu/todo.rst b/Documentation/gpu/todo.rst index 2ea6ffc9b22b..3104ffbd6295 100644 --- a/Documentation/gpu/todo.rst +++ b/Documentation/gpu/todo.rst @@ -633,10 +633,46 @@ long as that supports DMA. Otherwise importing can still needlessly fail. Contact: Thomas Zimmermann <tzimmermann@xxxxxxx>, Daniel Vetter Level: Advanced +Improve HDMI Infrastructure +--------------------------- + +We have a bunch of helpers to handle HDMI and reduce the boilerplate in +drivers. Support so far includes HDMI 1.4 support, but we need to extend +it with: + + - CEC handling support. CEC requires a bit of integration into every + HDMI driver to set the device physical address according to the EDID + in `.get_modes`, and to clear/reset it in the hotplug detection + path. We should create the ``drm_atomic_helper_connector_hdmi_get_modes()`` + and ``drm_atomic_helper_connector_hdmi_handle_hotplug()`` helpers to handle + this properly, and convert drivers to use them. + + - In order to support HDMI 2.0 properly, the scrambler parameters need + to be moved into the state. This includes figuring out in + drm_atomic_helper_connector_hdmi_check() if the scrambler and TMDS ratio + need to be changed, and make the + ``drm_atomic_helper_connector_hdmi_handle_hotplug()`` helper reset the + scrambler status when the device is plugged and unplugged. + + - We need to support YUV420 too. + + - Make the audio support somewhat generic too. The lowest hanging fruits + would be to provide helpers for `get_eld`, to handle hotplug and compute + ACR, N, and CTS parameters. + + - Handling HDCP in a generic manner would be a good idea too. + See `[PATCH v10 00/10] drm/hdcp: Pull HDCP auth/exchange/check into helpers <https://lore.kernel.org/dri-devel/20230419154321.1993419-1-markyacoub@xxxxxxxxxx/>`_ + +The `vc4` driver is a good example for all this. + +Contact: Maxime Ripard <mripard@xxxxxxxxxx> + +Level: Intermediate + Better Testing ============== Add unit tests using the Kernel Unit Testing (KUnit) framework -- 2.45.2
