From nobody Sat Sep 21 00:07:34 2024 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 35163C6FD1D for ; Tue, 4 Apr 2023 10:48:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234620AbjDDKsa (ORCPT ); Tue, 4 Apr 2023 06:48:30 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57132 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234540AbjDDKsN (ORCPT ); Tue, 4 Apr 2023 06:48:13 -0400 Received: from madras.collabora.co.uk (madras.collabora.co.uk [IPv6:2a00:1098:0:82:1000:25:2eeb:e5ab]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 009452107 for ; Tue, 4 Apr 2023 03:48:11 -0700 (PDT) Received: from IcarusMOD.eternityproject.eu (2-237-20-237.ip236.fastwebnet.it [2.237.20.237]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) (Authenticated sender: kholk11) by madras.collabora.co.uk (Postfix) with ESMTPSA id 2C524660320F; Tue, 4 Apr 2023 11:48:10 +0100 (BST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=collabora.com; s=mail; t=1680605290; bh=piJKx8AJRTNo3xZLCBhwQ0b5ZyuIg8W2w0zGxP4Udgo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=QvnhtDxpm5FEQgsz+h24rX861+Xfdo7zKks0F+FXwMkDyZ+ODrvhCqRdElDkT3XtR CQHzgk3CUfVn8LJQKckgq5FGfF8Mbi9AgaDIs5siaOGw1rtGynZsA5g/rLvFHvDYQY QGS01Dbfv46uDaCnksm8zWy4ftQrwkWrPO4uCCaG8ggyRdAIGm8yL+NvaN7Kj86KJt a9Jpl8HxYu1OLrVOQRDEZeSzhozk/4Ipa8i2vc+ZStFpYZYURN9e7ViS6ODwDltu9q VzXbh6G9DcKKHIr4mWs9gXebXjJ9p9TumusV9t3c0RIJrFQLG+jTw9q5B5UCLOVqq9 6LOu3KclKU6iw== From: AngeloGioacchino Del Regno To: chunkuang.hu@kernel.org Cc: p.zabel@pengutronix.de, airlied@gmail.com, daniel@ffwll.ch, matthias.bgg@gmail.com, angelogioacchino.delregno@collabora.com, dri-devel@lists.freedesktop.org, linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kernel@collabora.com, wenst@chromium.org Subject: [PATCH v3 6/9] drm/mediatek: dp: Enable event interrupt only when bridge attached Date: Tue, 4 Apr 2023 12:47:57 +0200 Message-Id: <20230404104800.301150-7-angelogioacchino.delregno@collabora.com> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230404104800.301150-1-angelogioacchino.delregno@collabora.com> References: <20230404104800.301150-1-angelogioacchino.delregno@collabora.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" In preparation for implementing support for aux-bus in this driver, add a IRQ_NOAUTOEN flag to the event interrupt that we request at probe time and manage the enablement of the ISR at bridge_attach and detach time. When aux-bus will be implemented, enabling the interrupt before attaching the bridge will create an event storm and hang the kernel during boot. In any case, the interrupt handler anyway requires resources that are initialized by mtk_dp_bridge_attach(), so it cannot do anything meaningful without... and even crash, but that's not happening in the current code because the HW remains unpowered until resources are made available. Signed-off-by: AngeloGioacchino Del Regno --- drivers/gpu/drm/mediatek/mtk_dp.c | 15 ++++++++++----- 1 file changed, 10 insertions(+), 5 deletions(-) diff --git a/drivers/gpu/drm/mediatek/mtk_dp.c b/drivers/gpu/drm/mediatek/m= tk_dp.c index 19b145cf2e05..6aaf162a6bfe 100644 --- a/drivers/gpu/drm/mediatek/mtk_dp.c +++ b/drivers/gpu/drm/mediatek/mtk_dp.c @@ -100,6 +100,7 @@ struct mtk_dp_efuse_fmt { struct mtk_dp { bool enabled; bool need_debounce; + int irq; u8 max_lanes; u8 max_linkrate; u8 rx_cap[DP_RECEIVER_CAP_SIZE]; @@ -2148,6 +2149,8 @@ static int mtk_dp_bridge_attach(struct drm_bridge *br= idge, =20 mtk_dp->drm_dev =3D bridge->dev; =20 + irq_clear_status_flags(mtk_dp->irq, IRQ_NOAUTOEN); + enable_irq(mtk_dp->irq); mtk_dp_hwirq_enable(mtk_dp, true); =20 return 0; @@ -2164,6 +2167,7 @@ static void mtk_dp_bridge_detach(struct drm_bridge *b= ridge) struct mtk_dp *mtk_dp =3D mtk_dp_from_bridge(bridge); =20 mtk_dp_hwirq_enable(mtk_dp, false); + disable_irq(mtk_dp->irq); mtk_dp->drm_dev =3D NULL; mtk_dp_poweroff(mtk_dp); drm_dp_aux_unregister(&mtk_dp->aux); @@ -2482,7 +2486,7 @@ static int mtk_dp_probe(struct platform_device *pdev) { struct mtk_dp *mtk_dp; struct device *dev =3D &pdev->dev; - int ret, irq_num; + int ret; =20 mtk_dp =3D devm_kzalloc(dev, sizeof(*mtk_dp), GFP_KERNEL); if (!mtk_dp) @@ -2491,9 +2495,9 @@ static int mtk_dp_probe(struct platform_device *pdev) mtk_dp->dev =3D dev; mtk_dp->data =3D (struct mtk_dp_data *)of_device_get_match_data(dev); =20 - irq_num =3D platform_get_irq(pdev, 0); - if (irq_num < 0) - return dev_err_probe(dev, irq_num, + mtk_dp->irq =3D platform_get_irq(pdev, 0); + if (mtk_dp->irq < 0) + return dev_err_probe(dev, mtk_dp->irq, "failed to request dp irq resource\n"); =20 mtk_dp->next_bridge =3D devm_drm_of_get_bridge(dev, dev->of_node, 1, 0); @@ -2514,7 +2518,8 @@ static int mtk_dp_probe(struct platform_device *pdev) =20 spin_lock_init(&mtk_dp->irq_thread_lock); =20 - ret =3D devm_request_threaded_irq(dev, irq_num, mtk_dp_hpd_event, + irq_set_status_flags(mtk_dp->irq, IRQ_NOAUTOEN); + ret =3D devm_request_threaded_irq(dev, mtk_dp->irq, mtk_dp_hpd_event, mtk_dp_hpd_event_thread, IRQ_TYPE_LEVEL_HIGH, dev_name(dev), mtk_dp); --=20 2.40.0