From patchwork Thu Sep 29 03:29:49 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bibby Hsieh X-Patchwork-Id: 9355723 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id CAE7360756 for ; Thu, 29 Sep 2016 03:32:11 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id BDA1F297D0 for ; Thu, 29 Sep 2016 03:32:11 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id B1F4B297D3; Thu, 29 Sep 2016 03:32:11 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.2 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, UNPARSEABLE_RELAY autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 16A48297D0 for ; Thu, 29 Sep 2016 03:32:09 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.85_2 #1 (Red Hat Linux)) id 1bpS3n-0008Jc-Q2; Thu, 29 Sep 2016 03:30:59 +0000 Received: from [210.61.82.183] (helo=mailgw01.mediatek.com) by bombadil.infradead.org with esmtp (Exim 4.85_2 #1 (Red Hat Linux)) id 1bpS38-0006xS-9f; Thu, 29 Sep 2016 03:30:19 +0000 Received: from mtkhts09.mediatek.inc [(172.21.101.70)] by mailgw01.mediatek.com (envelope-from ) (mhqrelay.mediatek.com ESMTP with TLS) with ESMTP id 829907517; Thu, 29 Sep 2016 11:29:52 +0800 Received: from localhost.localdomain (10.21.14.115) by mtkhts09.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 14.3.266.1; Thu, 29 Sep 2016 11:25:55 +0800 From: Bibby Hsieh To: David Airlie , Matthias Brugger , Daniel Vetter , , Subject: [PATCH 2/2] drm/mediatek: clear IRQ status before enable OVL interrupt Date: Thu, 29 Sep 2016 11:29:49 +0800 Message-ID: <1475119789-64619-3-git-send-email-bibby.hsieh@mediatek.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1475119789-64619-1-git-send-email-bibby.hsieh@mediatek.com> References: <1475119789-64619-1-git-send-email-bibby.hsieh@mediatek.com> MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20160928_203018_593749_0B40084E X-CRM114-Status: GOOD ( 11.27 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Bibby Hsieh , linux-kernel@vger.kernel.org, Cawa Cheng , Daniel Kurtz , Mao Huang , CK Hu , Thierry Reding , Philipp Zabel , YT Shen , Yingjoe Chen , Sascha Hauer , linux-arm-kernel@lists.infradead.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP To make sure that the first vblank IRQ after enabling vblank isn't too short or immediate, we have to clear the IRQ status before enable OVL interrupt. Signed-off-by: Bibby Hsieh Acked-by: CK Hu --- drivers/gpu/drm/mediatek/mtk_disp_ovl.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c index 019b7ca..f75c5b5 100644 --- a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c +++ b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c @@ -80,6 +80,7 @@ static void mtk_ovl_enable_vblank(struct mtk_ddp_comp *comp, ddp_comp); priv->crtc = crtc; + writel(0x0, comp->regs + DISP_REG_OVL_INTSTA); writel_relaxed(OVL_FME_CPL_INT, comp->regs + DISP_REG_OVL_INTEN); }