From 83dd000865eaaeb0799bf5e6d12f8d8cdb740e91 Mon Sep 17 00:00:00 2001 From: "Lespiau, Damien" Date: Mon, 19 Aug 2013 16:59:03 +0100 Subject: drm: Add a helper to forge HDMI vendor infoframes MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit This can then be used by DRM drivers to setup their vendor infoframes. v2: Fix hmdi typo (Simon Farnsworth) v3: Adapt to the hdmi_vendor_infoframe rename Signed-off-by: Damien Lespiau Reviewed-by: Simon Farnsworth Reviewed-by: Ville Syrjälä Reviewed-by: Thierry Reding Signed-off-by: Dave Airlie --- drivers/gpu/drm/drm_edid.c | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+) (limited to 'drivers/gpu/drm') diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c index 3aa653f..ed3505f 100644 --- a/drivers/gpu/drm/drm_edid.c +++ b/drivers/gpu/drm/drm_edid.c @@ -3263,3 +3263,39 @@ drm_hdmi_avi_infoframe_from_display_mode(struct hdmi_avi_infoframe *frame, return 0; } EXPORT_SYMBOL(drm_hdmi_avi_infoframe_from_display_mode); + +/** + * drm_hdmi_vendor_infoframe_from_display_mode() - fill an HDMI infoframe with + * data from a DRM display mode + * @frame: HDMI vendor infoframe + * @mode: DRM display mode + * + * Note that there's is a need to send HDMI vendor infoframes only when using a + * 4k or stereoscopic 3D mode. So when giving any other mode as input this + * function will return -EINVAL, error that can be safely ignored. + * + * Returns 0 on success or a negative error code on failure. + */ +int +drm_hdmi_vendor_infoframe_from_display_mode(struct hdmi_vendor_infoframe *frame, + const struct drm_display_mode *mode) +{ + int err; + u8 vic; + + if (!frame || !mode) + return -EINVAL; + + vic = drm_match_hdmi_mode(mode); + if (!vic) + return -EINVAL; + + err = hdmi_vendor_infoframe_init(frame); + if (err < 0) + return err; + + frame->vic = vic; + + return 0; +} +EXPORT_SYMBOL(drm_hdmi_vendor_infoframe_from_display_mode); -- cgit v1.1