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Received: by smtp.zohomail.com with SMTPS id 1793893996571563.8882394295355; Thu, 5 Nov 2026 07:53:16 -0800 (PST) From: Nicolas Frattaroli Date: Thu, 05 Nov 2026 16:51:58 +0100 Subject: [PATCH v2 07/27] drm/bridge: synopsys: 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-v2-7-55f4215be2c2@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_414227_3191ED6E X-CRM114-Status: GOOD ( 13.95 ) 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 code to pack and schedule VTEM EMPs. Signed-off-by: Derek Foreman --- drivers/gpu/drm/bridge/synopsys/dw-hdmi-qp.c | 50 +++++++++++++++++++++++++++- drivers/gpu/drm/bridge/synopsys/dw-hdmi-qp.h | 1 + 2 files changed, 50 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-qp.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-qp.c index b268c9376087..8b3f586dc177 100644 --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-qp.c +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-qp.c @@ -689,6 +689,15 @@ static int dw_hdmi_qp_bridge_clear_spd_infoframe(struct drm_bridge *bridge) return 0; } +static int dw_hdmi_qp_bridge_clear_vtem_emp(struct drm_bridge *bridge) +{ + struct dw_hdmi_qp *hdmi = bridge->driver_private; + + dw_hdmi_qp_mod(hdmi, 0, PKTSCHED_EMP_VTEM_TX_EN, PKTSCHED_PKT_EN); + + return 0; +} + static int dw_hdmi_qp_bridge_clear_audio_infoframe(struct drm_bridge *bridge) { struct dw_hdmi_qp *hdmi = bridge->driver_private; @@ -791,6 +800,42 @@ static int dw_hdmi_qp_bridge_write_spd_infoframe(struct drm_bridge *bridge, return 0; } +static int dw_hdmi_qp_bridge_write_vtem_emp(struct drm_bridge *bridge, + const u8 *buffer, size_t len) +{ + struct dw_hdmi_qp *hdmi = bridge->driver_private; + u32 val, i; + + if (len != HDMI_INFOFRAME_SIZE(VTEM)) { + dev_err(hdmi->dev, "unsupported vtem emp packet size of %zu\n", len); + return -EINVAL; + } + + val = buffer[1] << 8 | buffer[2] << 16; + dw_hdmi_qp_write(hdmi, val, PKT_EMP_VTEM_CONTENTS0); + + val = buffer[3] | buffer[4] << 8; + dw_hdmi_qp_write(hdmi, val, PKT_EMP_VTEM_CONTENTS1); + + val = buffer[8] << 8 | buffer[9] << 16 | buffer[10] << 24; + dw_hdmi_qp_write(hdmi, val, PKT_EMP_VTEM_CONTENTS2); + + val = buffer[11] | buffer[12] << 8 | buffer[13] << 16; + dw_hdmi_qp_write(hdmi, val, PKT_EMP_VTEM_CONTENTS3); + + /* + * The remaining registers need to explicitly be rewritten even if they + * stay at 0, as per the hardware documentation. + */ + for (i = PKT_EMP_VTEM_CONTENTS4; i <= PKT_EMP_VTEM_CONTENTS7; i += 4) + dw_hdmi_qp_write(hdmi, 0, i); + + dw_hdmi_qp_mod(hdmi, PKTSCHED_EMP_VTEM_TX_EN, PKTSCHED_EMP_VTEM_TX_EN, + PKTSCHED_PKT_EN); + + return 0; +} + static int dw_hdmi_qp_bridge_write_audio_infoframe(struct drm_bridge *bridge, const u8 *buffer, size_t len) { @@ -1035,6 +1080,8 @@ static const struct drm_bridge_funcs dw_hdmi_qp_bridge_funcs = { .hdmi_write_hdr_drm_infoframe = dw_hdmi_qp_bridge_write_hdr_drm_infoframe, .hdmi_clear_spd_infoframe = dw_hdmi_qp_bridge_clear_spd_infoframe, .hdmi_write_spd_infoframe = dw_hdmi_qp_bridge_write_spd_infoframe, + .hdmi_clear_vtem_emp = dw_hdmi_qp_bridge_clear_vtem_emp, + .hdmi_write_vtem_emp = dw_hdmi_qp_bridge_write_vtem_emp, .hdmi_clear_audio_infoframe = dw_hdmi_qp_bridge_clear_audio_infoframe, .hdmi_write_audio_infoframe = dw_hdmi_qp_bridge_write_audio_infoframe, .hdmi_audio_startup = dw_hdmi_qp_audio_enable, @@ -1154,7 +1201,8 @@ struct dw_hdmi_qp *dw_hdmi_qp_bind(struct platform_device *pdev, DRM_BRIDGE_OP_HDMI | DRM_BRIDGE_OP_HDMI_AUDIO | DRM_BRIDGE_OP_HDMI_HDR_DRM_INFOFRAME | - DRM_BRIDGE_OP_HDMI_SPD_INFOFRAME; + DRM_BRIDGE_OP_HDMI_SPD_INFOFRAME | + DRM_BRIDGE_OP_HDMI_VTEM_EMP; hdmi->bridge.of_node = pdev->dev.of_node; hdmi->bridge.type = DRM_MODE_CONNECTOR_HDMIA; hdmi->bridge.vendor = "Synopsys"; diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-qp.h b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-qp.h index c07847e8d7dd..6ce87064a267 100644 --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-qp.h +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-qp.h @@ -210,6 +210,7 @@ #define PKTSCHED_AVI_TX_EN BIT(13) #define PKTSCHED_VSI_TX_EN BIT(12) #define PKTSCHED_EMP_CVTEM_TX_EN BIT(10) +#define PKTSCHED_EMP_VTEM_TX_EN BIT(9) #define PKTSCHED_AMD_TX_EN BIT(8) #define PKTSCHED_GCP_TX_EN BIT(3) #define PKTSCHED_AUDS_TX_EN BIT(2) -- 2.56.0