From patchwork Wed Apr 3 09:24:13 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Yannick FERTRE X-Patchwork-Id: 10883139 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 0DE491708 for ; Wed, 3 Apr 2019 09:24:39 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id EB9832015F for ; Wed, 3 Apr 2019 09:24:38 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id DF4C828704; Wed, 3 Apr 2019 09:24:38 +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=-5.2 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 94A892015F for ; Wed, 3 Apr 2019 09:24:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:Message-ID:Date:Subject:To :From:Reply-To:Cc:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References: List-Owner; bh=tuVNQ0p3ktPrklZNkW5OuCrYPTv1UWh0/GCokN5GMx4=; b=jEHx0JNi6kt+gO sq2r8U/85WixcEvx0lQ3xVccv6uAFQpJANvarZdlun4CHmrfXD3xxKNZVxAxlfY/04N5kN8ouPNAk UO55vPZdEn2c0tbCrfaKzTWPkbcADI31D7SCi5tm1bIUI5KXuQY31/Sf5ugqo0Y74iyTu0O/q5PeV r8ZTVdfXHdgna4FrkaAzFQvtPCi73MWMCkoStYf2kubAJj6ZAhTHD9jATwBGbhyvY8J8VW2Nxk35P r1/aVQVXqSAq6XDZpD6bibzYw/JYstA7ttfZgb3oFKn5gukIc0GhZMXO/muOJG2ZxeUaa3ETwiqpB VSJE370KSljxH8WOyHvw==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1hBc8K-0008Kt-Cx; Wed, 03 Apr 2019 09:24:36 +0000 Received: from mx07-00178001.pphosted.com ([62.209.51.94]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1hBc88-00086z-Eq for linux-arm-kernel@lists.infradead.org; Wed, 03 Apr 2019 09:24:28 +0000 Received: from pps.filterd (m0046668.ppops.net [127.0.0.1]) by mx07-00178001.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x339L3vM025652; Wed, 3 Apr 2019 11:24:19 +0200 Received: from beta.dmz-eu.st.com (beta.dmz-eu.st.com [164.129.1.35]) by mx07-00178001.pphosted.com with ESMTP id 2rmgmx2wjn-1 (version=TLSv1 cipher=ECDHE-RSA-AES256-SHA bits=256 verify=NOT); Wed, 03 Apr 2019 11:24:19 +0200 Received: from zeta.dmz-eu.st.com (zeta.dmz-eu.st.com [164.129.230.9]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id 12A0434; Wed, 3 Apr 2019 09:24:19 +0000 (GMT) Received: from Webmail-eu.st.com (Safex1hubcas24.st.com [10.75.90.94]) by zeta.dmz-eu.st.com (STMicroelectronics) with ESMTP id E4BB71AE1; Wed, 3 Apr 2019 09:24:18 +0000 (GMT) Received: from SAFEX1HUBCAS23.st.com (10.75.90.47) by Safex1hubcas24.st.com (10.75.90.94) with Microsoft SMTP Server (TLS) id 14.3.435.0; Wed, 3 Apr 2019 11:24:19 +0200 Received: from localhost (10.201.23.97) by webmail-ga.st.com (10.75.90.48) with Microsoft SMTP Server (TLS) id 14.3.435.0; Wed, 3 Apr 2019 11:24:18 +0200 From: =?utf-8?q?Yannick_Fertr=C3=A9?= To: Yannick Fertre , Philippe Cornu , Benjamin Gaignard , Vincent Abriou , David Airlie , Daniel Vetter , Maxime Coquelin , Alexandre Torgue , , , , Subject: [PATCH] drm/stm: ltdc: reset controller to avoid partial refresh Date: Wed, 3 Apr 2019 11:24:13 +0200 Message-ID: <1554283453-2879-1-git-send-email-yannick.fertre@st.com> X-Mailer: git-send-email 2.7.4 MIME-Version: 1.0 X-Originating-IP: [10.201.23.97] X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2019-04-03_05:, , signatures=0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190403_022424_983518_74EC7854 X-CRM114-Status: UNSURE ( 8.56 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , 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 Display controller reset must be done as soon as possible after enable the clock to avoid partial refresh on screen. Signed-off-by: Yannick Fertré Acked-by: Philippe Cornu --- drivers/gpu/drm/stm/ltdc.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/drivers/gpu/drm/stm/ltdc.c b/drivers/gpu/drm/stm/ltdc.c index 32fd6a3..7bbe61c 100644 --- a/drivers/gpu/drm/stm/ltdc.c +++ b/drivers/gpu/drm/stm/ltdc.c @@ -1134,6 +1134,12 @@ int ltdc_load(struct drm_device *ddev) return -ENODEV; } + if (!IS_ERR(rstc)) { + reset_control_assert(rstc); + usleep_range(10, 20); + reset_control_deassert(rstc); + } + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); ldev->regs = devm_ioremap_resource(dev, res); if (IS_ERR(ldev->regs)) { @@ -1156,12 +1162,6 @@ int ltdc_load(struct drm_device *ddev) } } - if (!IS_ERR(rstc)) { - reset_control_assert(rstc); - usleep_range(10, 20); - reset_control_deassert(rstc); - } - /* Disable interrupts */ reg_clear(ldev->regs, LTDC_IER, IER_LIE | IER_RRIE | IER_FUIE | IER_TERRIE);