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Received: by smtp.zohomail.com with SMTPS id 1793893983774815.9743865612031; Thu, 5 Nov 2026 07:53:03 -0800 (PST) From: Nicolas Frattaroli Date: Thu, 05 Nov 2026 16:51:56 +0100 Subject: [PATCH v2 05/27] drm/connector: hdmi: Add VTEM EMP generation X-Archived-By: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20261105-vrr-limiter-uapi-v2-5-55f4215be2c2@collabora.com> References: <20261105-vrr-limiter-uapi-v2-0-55f4215be2c2@collabora.com> In-Reply-To: <20261105-vrr-limiter-uapi-v2-0-55f4215be2c2@collabora.com> To: Xaver Hugl , Vidith Madhu , "Borah, Chaitanya Kumar" , Leo Li , Harry Wentland , Fangzhi Zuo , Daniel Stone , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Helge Deller , Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Luca Ceresoli , Sandy Huang , =?utf-8?q?Heiko_St=C3=BCbner?= , Andy Yan , =?utf-8?q?Michel_D=C3=A4nzer?= Cc: dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, linux-fbdev@vger.kernel.org, linux-rockchip@lists.infradead.org, linux-arm-kernel@lists.infradead.org, kernel@collabora.com, Derek Foreman , wayland-devel@lists.freedesktop.org, Nicolas Frattaroli X-Mailer: b4 0.15.2 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20261105_075350_128921_29C389FF X-CRM114-Status: GOOD ( 12.33 ) X-Spam-Score: -2.1 (--) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" X-Spam-Status: No, score=-16.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_EF,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=4.0.1 X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 From: Derek Foreman Add VTEM EMP generation to enable variable refresh rate signalling over HDMI. These infoframes are only generated if the sink supports VRR. Signed-off-by: Derek Foreman Signed-off-by: Nicolas Frattaroli --- drivers/gpu/drm/display/drm_hdmi_state_helper.c | 63 +++++++++++++++++++++++++ include/drm/drm_connector.h | 5 ++ 2 files changed, 68 insertions(+) diff --git a/drivers/gpu/drm/display/drm_hdmi_state_helper.c b/drivers/gpu/drm/display/drm_hdmi_state_helper.c index eb6abfd1350d..ce680eaa5047 100644 --- a/drivers/gpu/drm/display/drm_hdmi_state_helper.c +++ b/drivers/gpu/drm/display/drm_hdmi_state_helper.c @@ -853,6 +853,61 @@ static int hdmi_generate_hdmi_vendor_infoframe(const struct drm_connector *conne return 0; } +static int hdmi_generate_emp_infoframe_vtem(const struct drm_connector *connector, + struct drm_connector_state *conn_state) +{ + const struct drm_display_info *info = &connector->display_info; + const struct drm_crtc_state *crtc_state = + drm_atomic_get_crtc_state(conn_state->state, conn_state->crtc); + struct drm_connector_hdmi_infoframe *infoframe = + &conn_state->hdmi.infoframes.vtem; + struct hdmi_emp_infoframe_vtem *vtem = + &infoframe->data.vtem; + const struct drm_crtc_vrr_state *vrr = &crtc_state->vrr_state; + int vfront; + u8 avi_vic; + + infoframe->set = false; + + if (!connector->hdmi.funcs->vtem.write_infoframe) + return 0; + + if (!info->hdmi.vrr_cap.supported) + return 0; + + if (conn_state->hdmi.infoframes.avi.set) + avi_vic = conn_state->hdmi.infoframes.avi.data.avi.video_code; + else + avi_vic = 0; + + hdmi_emp_infoframe_vtem_init(vtem); + + switch (conn_state->vrr_display_mode) { + case VRR_DISPLAY_MODE_GAME: + vtem->game_vrr_en = true; + vtem->m_const = !vrr->dynamic; + break; + case VRR_DISPLAY_MODE_OFF: + break; + default: + return -EINVAL; + } + + if (vtem->game_vrr_en && !avi_vic) { + vtem->base_refresh_rate = drm_mode_vrefresh(&crtc_state->mode); + vfront = crtc_state->adjusted_mode.crtc_vsync_start - + crtc_state->adjusted_mode.crtc_vdisplay; + if (vfront > U8_MAX || vfront < 0) + return -EINVAL; + + vtem->base_vfront = vfront; + } + + infoframe->set = true; + + return 0; +} + static int hdmi_generate_infoframes(const struct drm_connector *connector, struct drm_connector_state *conn_state) @@ -884,6 +939,10 @@ hdmi_generate_infoframes(const struct drm_connector *connector, if (ret) return ret; + ret = hdmi_generate_emp_infoframe_vtem(connector, conn_state); + if (ret) + return ret; + return 0; } @@ -1475,6 +1534,10 @@ int drm_atomic_helper_connector_hdmi_update_infoframes(struct drm_connector *con goto out; } + ret = write_or_clear_infoframe(connector, &funcs->vtem, "VTEM", + &old_conn_state->hdmi.infoframes.vtem, + &new_conn_state->hdmi.infoframes.vtem); + out: mutex_unlock(&connector->hdmi.infoframes.lock); return ret; diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h index 184b10c89508..9df745ecff92 100644 --- a/include/drm/drm_connector.h +++ b/include/drm/drm_connector.h @@ -1186,6 +1186,11 @@ struct drm_connector_hdmi_state { * matching our state. */ struct drm_connector_hdmi_infoframe hdmi; + + /** + * @vtem: VTEM EMP infoframes structure matching our state. + */ + struct drm_connector_hdmi_infoframe vtem; } infoframes; /** -- 2.56.0