From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id CB45CCD4F58 for ; Mon, 18 May 2026 18:03:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=+X483UmFH1oM+AvERtj+tm2/xAXh2Zc09XCnMdCVPgk=; b=ayiIXoY+N7Ov+q V51y+pgiO6LXZipCoPX9Vi+QKSJG1x1tD4TSHQjaHselX6AH0V5Rc0M0tPS0ve0KC8TFKpEqwyPqT qgjRYqCtKV5uDiB9ZtmJMYUL4LvMGkZkOAZCGmKSbp6mcBklL39k65vseysRRto1z9dBph4NuaA5L LpFj6Wqye4kiZlsgZeg1cYCL7y9+wFH+IA//nOQQRwVtOu84TfAMGqLE1lx6oHcFerhOTD8PZWe4u Hy1Yunr+5b0Epjro7MsKf7QoaFLDuwxi/ad5f6IXmZ4u2pkJNSTT2WhUcy1dSWdfTompamSVohSu0 Ll0N+bthOVjTxQrhaxMw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wP2Jc-0000000GUSM-02H2; Mon, 18 May 2026 18:03:44 +0000 Received: from smtp.forwardemail.net ([121.127.44.66]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1wP2JV-0000000GUD7-0QCh for linux-amlogic@lists.infradead.org; Mon, 18 May 2026 18:03:40 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kwiboo.se; h=Content-Transfer-Encoding: MIME-Version: References: In-Reply-To: Message-ID: Date: Subject: Cc: To: From; q=dns/txt; s=fe-e1b5cab7be; t=1779127416; bh=/hZiUkfIGiN8nQnQfqNQPTR4hVnEkYNLDTXPMKl0d0I=; b=GpxA/ofTPszh8XDD2h1fr0Ya2OjQ5Mzt/ZpGrDymGCbcWWJJlHWdcGfA9D/qywIcftvOb99lf XMPsq+MhfSzld/em66LRRUYJa7gfL2Sujx5q8ubles0t9oMTosuxefxEfkxRxHQnN8QxffPDXre 8uyZpNXUmDuHVOjLMWQGHQt56WZ/9MnoS82IdppxejCI/glUMVe7FMMj4bQAOYPr5G3fbeo0YG2 g+q8VWGzmmI4sGEzZdJaXT/+7weSp59CRvJO8mpGiK1ZTaTpLLSG6xW6AGFtHcc76dFOXbqQSYt QXCEinIMIwNBQOCDpKBhhlOeOOtqzBBsYWJ38OF5yjkw== X-Forward-Email-ID: 6a0b5472b84dbc72d2274f8f X-Forward-Email-Sender: rfc822; jonas@kwiboo.se, smtp.forwardemail.net, 121.127.44.66 X-Forward-Email-Version: 2.8.12 X-Forward-Email-Website: https://forwardemail.net X-Complaints-To: abuse@forwardemail.net X-Report-Abuse: abuse@forwardemail.net X-Report-Abuse-To: abuse@forwardemail.net From: Jonas Karlman To: Andrzej Hajda , Neil Armstrong , Robert Foss , Heiko Stuebner , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Luca Ceresoli , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter Subject: [PATCH v7 18/23] drm: bridge: dw_hdmi: Drop call to drm_bridge_hpd_notify() Date: Mon, 18 May 2026 18:01:54 +0000 Message-ID: <20260518180206.2480119-19-jonas@kwiboo.se> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260518180206.2480119-1-jonas@kwiboo.se> References: <20260518180206.2480119-1-jonas@kwiboo.se> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260518_110337_302343_0CCBAA1C X-CRM114-Status: GOOD ( 14.39 ) X-BeenThere: linux-amlogic@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Dmitry Baryshkov , imx@lists.linux.dev, Liu Ying , linux-kernel@vger.kernel.org, Sandy Huang , dri-devel@lists.freedesktop.org, linux-sunxi@lists.linux.dev, Diederik de Haas , linux-rockchip@lists.infradead.org, linux-amlogic@lists.infradead.org, Andy Yan , Chen-Yu Tsai , Nicolas Frattaroli , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-amlogic" Errors-To: linux-amlogic-bounces+linux-amlogic=archiver.kernel.org@lists.infradead.org The use of calls to both drm_helper_hpd_irq_event() and drm_bridge_hpd_notify() from the HPD IRQ handler may cause multiple hotplug uevents and modesets when the bridge connector is used. Use of drm_helper_hpd_irq_event() cause the internal DRM function check_connector_changed() to be called, which in turn calls the connector detect()/force() funcs to detect any connection status or epoch changes, and when changed trigger a hotplug uevent. This also help ensure that EDID and CEC phys addr is updated. If only a call drm_bridge_hpd_notify() would be used, a custom connector status/EDID change detection logic needs to be implemented, to fully match what check_connector_changed() already provides. The bridge connector detect() func also ensures that any hpd_notify() funcs are called for all bridges in the chain, so there is not really any need to have a call to drm_bridge_hpd_notify() here. With both calls there is two hotplug uevents, two modesets and a total of four .hpd_notify() calls (using a bridge connector): dw_hdmi_irq(): EVENT=plugout drm_helper_hpd_irq_event(): dw_hdmi_bridge_hpd_notify(status=2) [drm:check_connector_changed] [CONNECTOR:46:HDMI-A-1] status updated from connected to disconnected [drm:check_connector_changed] [CONNECTOR:46:HDMI-A-1] Changed epoch counter 1 => 2 [drm:drm_sysfs_connector_hotplug_event] [CONNECTOR:46:HDMI-A-1] generating connector hotplug event drm_client_hotplug(): [drm:drm_fb_helper_hotplug_event] [drm:drm_client_modeset_probe] [drm:drm_helper_probe_single_connector_modes] [CONNECTOR:46:HDMI-A-1] dw_hdmi_bridge_hpd_notify(status=2) [drm:drm_helper_probe_single_connector_modes] [CONNECTOR:46:HDMI-A-1] disconnected [drm:drm_edid_connector_update] [CONNECTOR:46:HDMI-A-1] EDID changed, epoch counter 3 [drm:drm_client_modeset_probe] No connectors reported connected with modes [drm:drm_client_modeset_probe] [CONNECTOR:46:HDMI-A-1] enabled? no [drm:drm_client_firmware_config.isra.0] Not using firmware configuration [drm:drm_client_modeset_probe] picking CRTCs for 3840x2160 config [drm:drm_client_hotplug] fbdev: ret=0 drm_bridge_hpd_notify(): dw_hdmi_bridge_hpd_notify(status=2) [drm:drm_sysfs_connector_hotplug_event] [CONNECTOR:46:HDMI-A-1] generating connector hotplug event drm_client_hotplug(): [drm:drm_fb_helper_hotplug_event] [drm:drm_client_modeset_probe] [drm:drm_helper_probe_single_connector_modes] [CONNECTOR:46:HDMI-A-1] dw_hdmi_bridge_hpd_notify(status=2) [drm:drm_helper_probe_single_connector_modes] [CONNECTOR:46:HDMI-A-1] disconnected [drm:drm_client_modeset_probe] No connectors reported connected with modes [drm:drm_client_modeset_probe] [CONNECTOR:46:HDMI-A-1] enabled? no [drm:drm_client_firmware_config.isra.0] Not using firmware configuration [drm:drm_client_modeset_probe] picking CRTCs for 3840x2160 config [drm:drm_client_hotplug] fbdev: ret=0 Change to only call drm_helper_hpd_irq_event() from HPD IRQ handler to ensure that only one hotplug uevent is sent to userspace when connection status or EDID changes. With only a call the drm_helper_hpd_irq_event() there is only a single hotplug uevent and only two .hpd_notify() calls: dw_hdmi_irq(): EVENT=plugout drm_helper_hpd_irq_event(): dw_hdmi_bridge_hpd_notify(status=2) [drm:check_connector_changed] [CONNECTOR:46:HDMI-A-1] status updated from connected to disconnected [drm:check_connector_changed] [CONNECTOR:46:HDMI-A-1] Changed epoch counter 1 => 2 [drm:drm_sysfs_connector_hotplug_event] [CONNECTOR:46:HDMI-A-1] generating connector hotplug event drm_client_hotplug(): [drm:drm_fb_helper_hotplug_event] [drm:drm_client_modeset_probe] [drm:drm_helper_probe_single_connector_modes] [CONNECTOR:46:HDMI-A-1] dw_hdmi_bridge_hpd_notify(status=2) [drm:drm_helper_probe_single_connector_modes] [CONNECTOR:46:HDMI-A-1] disconnected [drm:drm_edid_connector_update] [CONNECTOR:46:HDMI-A-1] EDID changed, epoch counter 3 [drm:drm_client_modeset_probe] No connectors reported connected with modes [drm:drm_client_modeset_probe] [CONNECTOR:46:HDMI-A-1] enabled? no [drm:drm_client_firmware_config.isra.0] Not using firmware configuration [drm:drm_client_modeset_probe] picking CRTCs for 3840x2160 config [drm:drm_client_hotplug] fbdev: ret=0 Tested-by: Diederik de Haas # Rock64, RockPro64, Quartz64-B Signed-off-by: Jonas Karlman --- v7: No change v6: Drop the call from IRQ handler instead, prior to use of a HPD delayed work to avoid a possible deadlock with use of sync() calls in the bridge hpd_disable() ops, Update commit message, Collect t-b tag v5: New patch --- drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c index 5dacb8a99715..8afc9d240121 100644 --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c @@ -3101,10 +3101,8 @@ static irqreturn_t dw_hdmi_irq(int irq, void *dev_id) status == connector_status_connected ? "plugin" : "plugout"); - if (hdmi->bridge.dev) { + if (hdmi->bridge.dev) drm_helper_hpd_irq_event(hdmi->bridge.dev); - drm_bridge_hpd_notify(&hdmi->bridge, status); - } } hdmi_writeb(hdmi, intr_stat, HDMI_IH_PHY_STAT0); -- 2.54.0 _______________________________________________ linux-amlogic mailing list linux-amlogic@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-amlogic