From patchwork Wed Sep 20 09:06:58 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Jason-JH.Lin" X-Patchwork-Id: 13392345 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 gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (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 98BD7CE79AB for ; Wed, 20 Sep 2023 09:07:10 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 1550C10E46B; Wed, 20 Sep 2023 09:07:10 +0000 (UTC) Received: from mailgw01.mediatek.com (unknown [60.244.123.138]) by gabe.freedesktop.org (Postfix) with ESMTPS id B4AD310E46B for ; Wed, 20 Sep 2023 09:07:07 +0000 (UTC) X-UUID: 0fd5e3e6579511eea33bb35ae8d461a2-20230920 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=mediatek.com; s=dk; h=Content-Type:MIME-Version:Message-ID:Date:Subject:CC:To:From; bh=/IyHQhcgjEjodrMzK+HW2LWut1HbF1Suqy+kbdt9trY=; b=nRstIuqGmTgFl5p6pFARCzkq9y0daZ+N73Qg1XXRN3+8WnBGd61hilKuvb7c4W+xj/1jnTlp4+Bbnvp1Xiy3of0ci8k5v3F1yQiWj97hCNlWGn4R9UwZ8GXPJhmb87PcjI4ZCmOlFcyNpvvUDSJ0O3TkKC1mVs5M3mIw1R+ly+k=; X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.1.32, REQID:e2eec0e9-9412-4ab3-8a42-3a14a87db0ec, IP:0, U RL:0,TC:0,Content:0,EDM:0,RT:0,SF:0,FILE:0,BULK:0,RULE:Release_Ham,ACTION: release,TS:0 X-CID-META: VersionHash:5f78ec9, CLOUDID:4d313fc3-1e57-4345-9d31-31ad9818b39f, B ulkID:nil,BulkQuantity:0,Recheck:0,SF:102,TC:nil,Content:0,EDM:-3,IP:nil,U RL:0,File:nil,Bulk:nil,QS:nil,BEC:nil,COL:0,OSI:0,OSA:0,AV:0,LES:1,SPR:NO, DKR:0,DKP:0,BRR:0,BRE:0 X-CID-BVR: 0 X-CID-BAS: 0,_,0,_ X-CID-FACTOR: TF_CID_SPAM_SNR X-UUID: 0fd5e3e6579511eea33bb35ae8d461a2-20230920 Received: from mtkmbs10n1.mediatek.inc [(172.21.101.34)] by mailgw01.mediatek.com (envelope-from ) (Generic MTA with TLSv1.2 ECDHE-RSA-AES256-GCM-SHA384 256/256) with ESMTP id 1453685605; Wed, 20 Sep 2023 17:07:02 +0800 Received: from mtkmbs13n2.mediatek.inc (172.21.101.108) by MTKMBS14N1.mediatek.inc (172.21.101.75) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.26; Wed, 20 Sep 2023 17:07:00 +0800 Received: from mtksdccf07.mediatek.inc (172.21.84.99) by mtkmbs13n2.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.2.1118.26 via Frontend Transport; Wed, 20 Sep 2023 17:07:00 +0800 From: Jason-JH.Lin To: Chun-Kuang Hu Subject: [PATCH v2] drm/mediatek: Add spinlock for setting vblank event in atomic_begin Date: Wed, 20 Sep 2023 17:06:58 +0800 Message-ID: <20230920090658.31181-1-jason-jh.lin@mediatek.com> X-Mailer: git-send-email 2.18.0 MIME-Version: 1.0 X-TM-AS-Product-Ver: SMEX-14.0.0.3152-9.1.1006-23728.005 X-TM-AS-Result: No-10--8.864100-8.000000 X-TMASE-MatchedRID: yvDAzrttxFVW9INJWhg3DawxbZnudyr7reJWlnSW7AxXM6Z39sH1vkc2 fZLt8LipM93My8Jw9/pxec6bnKstogDNPxu11HXj4pdq9sdj8LXDHSNFHFxB81pbYq2f4jz+DoG UY3RYqs1yylwV7Bc73YAy6p60ZV62fJ5/bZ6npdg7AFczfjr/7CMTOn56y8870WL5EkrSQGDbP2 TY8Cia6JMlz/+BN5hQ86PZEhbrr3g= X-TM-AS-User-Approved-Sender: No X-TM-AS-User-Blocked-Sender: No X-TMASE-Result: 10--8.864100-8.000000 X-TMASE-Version: SMEX-14.0.0.3152-9.1.1006-23728.005 X-TM-SNTS-SMTP: 521E270ABAD57F2F2A357424CB05B629A9A966E080AE15BDCB154348DA72D4932000:8 X-MTK: N X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Alexandre Mergnat , "Jason-JH . Lin" , Singo Chang , Fei Shao , linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, Project_Global_Chrome_Upstream_Group@mediatek.com, Jason-ch Chen , Nancy Lin , Johnson Wang , Shawn Sung , linux-mediatek@lists.infradead.org, linux-arm-kernel@lists.infradead.org, AngeloGioacchino Del Regno Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Add spinlock protection to avoid race condition on vblank event between mtk_drm_crtc_atomic_begin() and mtk_drm_finish_page_flip(). Fixes: 119f5173628a ("drm/mediatek: Add DRM Driver for Mediatek SoC MT8173.") Signed-off-by: Jason-JH.Lin Suggested-by: AngeloGioacchino Del Regno Reviewed-by: Alexandre Mergnat Reviewed-by: Fei Shao Tested-by: Fei Shao Reviewed-by: AngeloGioacchino Del Regno Reviewed-by: CK Hu --- drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c index b6fa4ad2f94d..cab4fe092f13 100644 --- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c +++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c @@ -744,6 +744,7 @@ static void mtk_drm_crtc_atomic_begin(struct drm_crtc *crtc, crtc); struct mtk_crtc_state *mtk_crtc_state = to_mtk_crtc_state(crtc_state); struct mtk_drm_crtc *mtk_crtc = to_mtk_crtc(crtc); + unsigned long flags; if (mtk_crtc->event && mtk_crtc_state->base.event) DRM_ERROR("new event while there is still a pending event\n"); @@ -751,7 +752,11 @@ static void mtk_drm_crtc_atomic_begin(struct drm_crtc *crtc, if (mtk_crtc_state->base.event) { mtk_crtc_state->base.event->pipe = drm_crtc_index(crtc); WARN_ON(drm_crtc_vblank_get(crtc) != 0); + + spin_lock_irqsave(&crtc->dev->event_lock, flags); mtk_crtc->event = mtk_crtc_state->base.event; + spin_unlock_irqrestore(&crtc->dev->event_lock, flags); + mtk_crtc_state->base.event = NULL; } }