From patchwork Tue Dec 8 12:28:29 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tomi Valkeinen X-Patchwork-Id: 11958437 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 39073C4361B for ; Tue, 8 Dec 2020 12:30:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E453F23A9D for ; Tue, 8 Dec 2020 12:30:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728192AbgLHMa5 (ORCPT ); Tue, 8 Dec 2020 07:30:57 -0500 Received: from fllv0016.ext.ti.com ([198.47.19.142]:33282 "EHLO fllv0016.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727463AbgLHMa5 (ORCPT ); Tue, 8 Dec 2020 07:30:57 -0500 Received: from lelv0266.itg.ti.com ([10.180.67.225]) by fllv0016.ext.ti.com (8.15.2/8.15.2) with ESMTP id 0B8CTnfi064008; Tue, 8 Dec 2020 06:29:49 -0600 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1607430589; bh=s1EWE/SXUVeER6hkk0HRG9tRuUdyEyQIlfDmCa0tmQM=; h=From:To:CC:Subject:Date:In-Reply-To:References; b=zWrShTYuAjhM8Vy/qqK0zmAqP7YKOCmAzzr6MU/v4JIP7cUb5gpy07kdNLfh2f+e2 VHt2+wg0VUdek0GNSAG5BA+AnKvf0uG5Qbk7x+Pv6a8l6R/aUozcL76HvGblZiq2pp lLUuSCQtdz8kMoNVfOROWFbwZBpQKH2nvx9C09aA= Received: from DFLE115.ent.ti.com (dfle115.ent.ti.com [10.64.6.36]) by lelv0266.itg.ti.com (8.15.2/8.15.2) with ESMTPS id 0B8CTn9X103274 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Tue, 8 Dec 2020 06:29:49 -0600 Received: from DFLE104.ent.ti.com (10.64.6.25) by DFLE115.ent.ti.com (10.64.6.36) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1979.3; Tue, 8 Dec 2020 06:29:48 -0600 Received: from fllv0040.itg.ti.com (10.64.41.20) by DFLE104.ent.ti.com (10.64.6.25) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1979.3 via Frontend Transport; Tue, 8 Dec 2020 06:29:48 -0600 Received: from deskari.ti.com (ileax41-snat.itg.ti.com [10.172.224.153]) by fllv0040.itg.ti.com (8.15.2/8.15.2) with ESMTP id 0B8CTcjH095068; Tue, 8 Dec 2020 06:29:46 -0600 From: Tomi Valkeinen To: Sebastian Reichel , Laurent Pinchart , Nikhil Devshatwar , CC: , Sekhar Nori , Tony Lindgren , , Sam Ravnborg , Tomi Valkeinen Subject: [PATCH v5 03/29] drm/omap: pll: fix iteration loop check Date: Tue, 8 Dec 2020 14:28:29 +0200 Message-ID: <20201208122855.254819-4-tomi.valkeinen@ti.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20201208122855.254819-1-tomi.valkeinen@ti.com> References: <20201208122855.254819-1-tomi.valkeinen@ti.com> MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org If the PLL calc function is given bad parameters, n_start/m_start may be higher than n_stop/m_stop, which leads to the loops iterating through the whole u32 number space. Fix this by failing early on such cases. Signed-off-by: Tomi Valkeinen Reviewed-by: Laurent Pinchart Reviewed-by: Sebastian Reichel --- drivers/gpu/drm/omapdrm/dss/pll.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/gpu/drm/omapdrm/dss/pll.c b/drivers/gpu/drm/omapdrm/dss/pll.c index 1212f3cc52d1..12926218c436 100644 --- a/drivers/gpu/drm/omapdrm/dss/pll.c +++ b/drivers/gpu/drm/omapdrm/dss/pll.c @@ -222,6 +222,9 @@ bool dss_pll_calc_a(const struct dss_pll *pll, unsigned long clkin, n_stop = min((unsigned)(clkin / fint_hw_min), hw->n_max); n_inc = 1; + if (n_start > n_stop) + return false; + if (hw->errata_i886) { swap(n_start, n_stop); n_inc = -1; @@ -239,6 +242,9 @@ bool dss_pll_calc_a(const struct dss_pll *pll, unsigned long clkin, hw->m_max); m_inc = 1; + if (m_start > m_stop) + continue; + if (hw->errata_i886) { swap(m_start, m_stop); m_inc = -1;