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spf=pass smtp.mailfrom=nicolas.frattaroli@collabora.com; dmarc=pass header.from= DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; t=1790005967; s=zohomail; d=collabora.com; i=nicolas.frattaroli@collabora.com; h=From:From:Date:Date:Subject:Subject:MIME-Version:Content-Type:Content-Transfer-Encoding:Message-Id:Message-Id:In-Reply-To:To:To:Cc:Cc:Reply-To; bh=NrH1BPLpuLOqQDQpOONb+r82Ea0xWENpicF6PhqY/S8=; b=eoObOOP2Dc5eRhtDEA2ShosHM7hJxzu2HeIFqOlzIQExUrtPWD/UdiB0t2dDRNfw gpUucXuH46qfDDPYyQMBuq4n4AMDGVkcIQQWzUGtfCJtRVUsndEnQGCFdf4bN+qY/hM iF5/yDj8eu6yLjPmcZMZihVDmn/Zvr92ihZu/Hsk= Received: by smtp.zohomail.com with SMTPS id 17900059663881006.9027491955; Mon, 21 Sep 2026 08:52:46 -0700 (PDT) From: Nicolas Frattaroli Date: Mon, 21 Sep 2026 17:51:34 +0200 Subject: [PATCH RFC 08/25] drm/bridge: synopsys: Add VTEM EMP support MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260921-vrr-limiter-uapi-v1-8-2fcd7d011646@collabora.com> References: <20260921-vrr-limiter-uapi-v1-0-2fcd7d011646@collabora.com> In-Reply-To: <20260921-vrr-limiter-uapi-v1-0-2fcd7d011646@collabora.com> To: "Borah, Chaitanya Kumar" , Leo Li , 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 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-20260921_165334_886772_5FCF467E X-CRM114-Status: GOOD ( 13.50 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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 c9568aea98dc..3315082d4475 100644 --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-qp.c +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-qp.c @@ -673,6 +673,15 @@ 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; @@ -775,6 +784,42 @@ 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) { @@ -1000,6 +1045,8 @@ 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, @@ -1118,7 +1165,8 @@ 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; if (!hdmi->no_hpd) hdmi->bridge.ops |= DRM_BRIDGE_OP_HPD; hdmi->bridge.of_node = pdev->dev.of_node; 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) -- 2.55.0