From 4fc30c2c5c61db88e3d6644bd3dd2032ec4bee06 Mon Sep 17 00:00:00 2001 From: Dmitry Baryshkov Date: Wed, 7 Jan 2026 20:15:05 +0200 Subject: [PATCH] drm/display: hdmi_state_helper: don't generate unsupported InfoFrames There is little point in generating InfoFrames which are not supported by the driver. Skip generating the unsupported InfoFrames, making sure that the kernel never tries to write the unsupported frame. As there are no remaining usecases, change write_infoframe / clear_infoframe helpers return an error if the corresponding callback is NULL. Acked-by: Maxime Ripard Link: https://patch.msgid.link/20260107-limit-infoframes-2-v4-8-213d0d3bd490@oss.qualcomm.com Signed-off-by: Dmitry Baryshkov --- drivers/gpu/drm/display/drm_hdmi_state_helper.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/display/drm_hdmi_state_helper.c b/drivers/gpu/drm/display/drm_hdmi_state_helper.c index e8556bf9e1da..a1d16762ac7a 100644 --- a/drivers/gpu/drm/display/drm_hdmi_state_helper.c +++ b/drivers/gpu/drm/display/drm_hdmi_state_helper.c @@ -718,6 +718,9 @@ static int hdmi_generate_spd_infoframe(const struct drm_connector *connector, infoframe->set = false; + if (!connector->hdmi.funcs->spd.write_infoframe) + return 0; + ret = hdmi_spd_infoframe_init(frame, connector->hdmi.vendor, connector->hdmi.product); @@ -742,6 +745,9 @@ static int hdmi_generate_hdr_infoframe(const struct drm_connector *connector, infoframe->set = false; + if (!connector->hdmi.funcs->hdr_drm.write_infoframe) + return 0; + if (connector->max_bpc < 10) return 0; @@ -902,7 +908,7 @@ static int clear_infoframe(struct drm_connector *connector, if (!funcs->clear_infoframe) { drm_dbg_kms(dev, "Function not implemented, bailing.\n"); - return 0; + return -EOPNOTSUPP; } ret = funcs->clear_infoframe(connector); @@ -928,7 +934,7 @@ static int write_infoframe(struct drm_connector *connector, if (!funcs->write_infoframe) { drm_dbg_kms(dev, "Function not implemented, bailing.\n"); - return 0; /* XXX: temporal until we stop generating unsupported frames */ + return -EOPNOTSUPP; } len = hdmi_infoframe_pack(&new_frame->data, buffer, sizeof(buffer)); -- 2.47.3