From 24557865c8b1a6d0eaccaac47aabd9b23badf8fd Mon Sep 17 00:00:00 2001 From: Sean Paul Date: Mon, 8 Jan 2018 14:55:37 -0500 Subject: drm: Add Content Protection property This patch adds a new optional connector property to allow userspace to enable protection over the content it is displaying. This will typically be implemented by the driver using HDCP. The property is a tri-state with the following values: - OFF: Self explanatory, no content protection - DESIRED: Userspace requests that the driver enable protection - ENABLED: Once the driver has authenticated the link, it sets this value The driver is responsible for downgrading ENABLED to DESIRED if the link becomes unprotected. The driver should also maintain the desiredness of protection across hotplug/dpms/suspend. If this looks familiar, I posted [1] this 3 years ago. We have been using this in ChromeOS across exynos, mediatek, and rockchip over that time. Changes in v2: - Pimp kerneldoc for content_protection_property (Daniel) - Drop sysfs attribute Changes in v3: - None Changes in v4: - Changed kerneldoc to recommend userspace polling (Daniel) - Changed kerneldoc to briefly describe how to attach the property (Daniel) Changes in v5: - checkpatch whitespace noise - Change DRM_MODE_CONTENT_PROTECTION_OFF to DRM_MODE_CONTENT_PROTECTION_UNDESIRED Changes in v6: - None Reviewed-by: Daniel Vetter Signed-off-by: Sean Paul [1] https://lists.freedesktop.org/archives/dri-devel/2014-December/073336.html Link: https://patchwork.freedesktop.org/patch/msgid/20180108195545.218615-4-seanpaul@chromium.org --- include/uapi/drm/drm_mode.h | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'include/uapi/drm/drm_mode.h') diff --git a/include/uapi/drm/drm_mode.h b/include/uapi/drm/drm_mode.h index 5597a87154e5..d1a69ff24fe8 100644 --- a/include/uapi/drm/drm_mode.h +++ b/include/uapi/drm/drm_mode.h @@ -173,6 +173,10 @@ extern "C" { DRM_MODE_REFLECT_X | \ DRM_MODE_REFLECT_Y) +/* Content Protection Flags */ +#define DRM_MODE_CONTENT_PROTECTION_UNDESIRED 0 +#define DRM_MODE_CONTENT_PROTECTION_DESIRED 1 +#define DRM_MODE_CONTENT_PROTECTION_ENABLED 2 struct drm_mode_modeinfo { __u32 clock; -- cgit v1.2.3