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Received: by smtp.zohomail.com with SMTPS id 1793893977295617.0780215669394; Thu, 5 Nov 2026 07:52:57 -0800 (PST) From: Nicolas Frattaroli Date: Thu, 05 Nov 2026 16:51:55 +0100 Subject: [PATCH v2 04/27] drm/bridge: Add VTEM EMP support X-Archived-By: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20261105-vrr-limiter-uapi-v2-4-55f4215be2c2@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_075429_401226_397F4407 X-CRM114-Status: GOOD ( 15.25 ) 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 setters and support bit for VTEM emp to the bridge. Signed-off-by: Derek Foreman --- drivers/gpu/drm/display/drm_bridge_connector.c | 41 ++++++++++++++++++++++++++ include/drm/drm_bridge.h | 29 ++++++++++++++++++ include/drm/drm_connector.h | 8 +++++ 3 files changed, 78 insertions(+) diff --git a/drivers/gpu/drm/display/drm_bridge_connector.c b/drivers/gpu/drm/display/drm_bridge_connector.c index 2202e6044444..0fbdba584c1b 100644 --- a/drivers/gpu/drm/display/drm_bridge_connector.c +++ b/drivers/gpu/drm/display/drm_bridge_connector.c @@ -611,6 +611,33 @@ static int drm_bridge_connector_scrambler_disable(struct drm_connector *connecto return bridge->funcs->hdmi_scrambler_disable(bridge); } +static int drm_bridge_connector_clear_vtem_emp(struct drm_connector *connector) +{ + struct drm_bridge_connector *bridge_connector = + to_drm_bridge_connector(connector); + struct drm_bridge *bridge; + + bridge = bridge_connector->bridge_hdmi; + if (!bridge) + return -EINVAL; + + return bridge->funcs->hdmi_clear_vtem_emp(bridge); +} + +static int drm_bridge_connector_write_vtem_emp(struct drm_connector *connector, + const u8 *buffer, size_t len) +{ + struct drm_bridge_connector *bridge_connector = + to_drm_bridge_connector(connector); + struct drm_bridge *bridge; + + bridge = bridge_connector->bridge_hdmi; + if (!bridge) + return -EINVAL; + + return bridge->funcs->hdmi_write_vtem_emp(bridge, buffer, len); +} + static const struct drm_edid * drm_bridge_connector_read_edid(struct drm_connector *connector) { @@ -656,6 +683,11 @@ static const struct drm_connector_infoframe_funcs drm_bridge_connector_hdmi_spd_ .write_infoframe = drm_bridge_connector_write_spd_infoframe, }; +static const struct drm_connector_infoframe_funcs drm_bridge_connector_hdmi_vtem_emp = { + .clear_infoframe = drm_bridge_connector_clear_vtem_emp, + .write_infoframe = drm_bridge_connector_write_vtem_emp, +}; + static int drm_bridge_connector_audio_startup(struct drm_connector *connector) { struct drm_bridge_connector *bridge_connector = @@ -947,6 +979,11 @@ struct drm_connector *drm_bridge_connector_init(struct drm_device *drm, !bridge->funcs->hdmi_scrambler_disable)) return ERR_PTR(-EINVAL); + if (bridge->ops & DRM_BRIDGE_OP_HDMI_VTEM_EMP && + (!bridge->funcs->hdmi_write_vtem_emp || + !bridge->funcs->hdmi_clear_vtem_emp)) + return ERR_PTR(-EINVAL); + bridge_connector->bridge_hdmi = drm_bridge_get(bridge); } @@ -1073,6 +1110,10 @@ struct drm_connector *drm_bridge_connector_init(struct drm_device *drm, drm_bridge_connector_scrambler_disable; } + if (bridge_connector->bridge_hdmi->ops & DRM_BRIDGE_OP_HDMI_VTEM_EMP) + bridge_connector->hdmi_funcs.vtem = + drm_bridge_connector_hdmi_vtem_emp; + ret = drmm_connector_hdmi_init(drm, connector, &drm_bridge_connector_funcs, &bridge_connector->hdmi_funcs, diff --git a/include/drm/drm_bridge.h b/include/drm/drm_bridge.h index 1981d24a700d..6913662023ca 100644 --- a/include/drm/drm_bridge.h +++ b/include/drm/drm_bridge.h @@ -684,6 +684,29 @@ struct drm_bridge_funcs { int (*hdmi_write_spd_infoframe)(struct drm_bridge *bridge, const u8 *buffer, size_t len); + /** + * @hdmi_clear_vtem_emp: + * + * This callback clears the emp in the hardware during commit. + * + * This callback is optional but it must be implemented by bridges that + * set the DRM_BRIDGE_OP_HDMI_VTEM_EMP flag in their + * &drm_bridge->ops. + */ + int (*hdmi_clear_vtem_emp)(struct drm_bridge *bridge); + + /** + * @hdmi_write_spd_infoframe: + * + * Program the emp into the hardware. + * + * This callback is optional but it must be implemented by bridges that + * set the DRM_BRIDGE_OP_HDMI_VTEM_EMP flag in their + * &drm_bridge->ops. + */ + int (*hdmi_write_vtem_emp)(struct drm_bridge *bridge, + const u8 *buffer, size_t len); + /** * @hdmi_clear_audio_infoframe: * @@ -1021,6 +1044,12 @@ enum drm_bridge_ops { * &drm_bridge_funcs->hdmi_clear_spd_infoframe callbacks. */ DRM_BRIDGE_OP_HDMI_SPD_INFOFRAME = BIT(10), + /** + * @DRM_BRIDGE_OP_HDMI_VTEM_EMP: The bridge supports + * &drm_bridge_funcs->hdmi_write_vtem_emp and + * &drm_bridge_funcs->hdmi_clear_vtem_emp callbacks. + */ + DRM_BRIDGE_OP_HDMI_VTEM_EMP = BIT(11), }; /** diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h index 8699f35cafcb..184b10c89508 100644 --- a/include/drm/drm_connector.h +++ b/include/drm/drm_connector.h @@ -1645,6 +1645,14 @@ struct drm_connector_hdmi_funcs { * optional. */ struct drm_connector_infoframe_funcs spd; + + /** + * @vtem: + * + * Set of callbacks for handling the VTEM EMP. These callbacks are + * optional. + */ + struct drm_connector_infoframe_funcs vtem; }; /** -- 2.56.0