From patchwork Thu May 16 07:28:52 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Elaine Zhang X-Patchwork-Id: 10945813 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 5615E924 for ; Thu, 16 May 2019 07:30:25 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 3E85928699 for ; Thu, 16 May 2019 07:30:25 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 32ACE288DD; Thu, 16 May 2019 07:30:25 +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=-3.7 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED,RCVD_IN_SORBS_WEB 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 1DC9428841 for ; Thu, 16 May 2019 07:30:24 +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:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:References: In-Reply-To:Message-Id:Date:Subject:To:From:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Owner; bh=dcR4470CbeYtm9sPjVOsL0DxAWBCPFIfwlcw5RjdMSc=; b=QpJGrwqPz0Izn4hgcqIBB1wm+5 NAEvIWU13aRZ9IEUEhpyNuO9/5oSYDSR+zvA08qOaBN6mKDyvW5WA53Gsp/i5LzATlK++68pkmjs9 e5XswwNu17RVOma+O4pF7hyd8KV3hEvAwDzzaNrLeCsqiXq5XLh8Eg23BN/S3jAGG0vW8yWmCjTJx E3Fwezmc7yCNvWb6wqLeXFpUQSonngx0RQEwhTSkwspMRN7mo9cLogEqM3yxzHXYKnAOPF5OF/xsZ rx4EkMdBesYZbSirJ9enXyKeo8gBpljHkfOruYdmkhSA7YeMKsNloMdjQV0NnAwVGjqMs/3tAoPoD 4tBgG9jA==; 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 1hRAqJ-0001Vi-3c; Thu, 16 May 2019 07:30:19 +0000 Received: from regular1.263xmail.com ([211.150.70.196]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1hRApC-0007Zq-5y; Thu, 16 May 2019 07:29:12 +0000 Received: from zhangqing?rock-chips.com (unknown [192.168.167.227]) by regular1.263xmail.com (Postfix) with ESMTP id B67CC8AA; Thu, 16 May 2019 15:29:02 +0800 (CST) X-263anti-spam: KSV:0;BIG:0; X-MAIL-GRAY: 0 X-MAIL-DELIVERY: 1 X-KSVirus-check: 0 X-ADDR-CHECKED4: 1 X-ABS-CHECKED: 1 X-SKE-CHECKED: 1 X-ANTISPAM-LEVEL: 2 Received: from localhost.localdomain (unknown [58.22.7.114]) by smtp.263.net (postfix) whith ESMTP id P7747T139724561819392S1557991736066321_; Thu, 16 May 2019 15:29:02 +0800 (CST) X-IP-DOMAINF: 1 X-UNIQUE-TAG: <2148eaae9c4abcde01f5eb8d8c275f3c> X-RL-SENDER: zhangqing@rock-chips.com X-SENDER: zhangqing@rock-chips.com X-LOGIN-NAME: zhangqing@rock-chips.com X-FST-TO: heiko@sntech.de X-SENDER-IP: 58.22.7.114 X-ATTACHMENT-NUM: 0 X-DNS-TYPE: 0 From: Elaine Zhang To: heiko@sntech.de Subject: [PATCH v2 2/6] clk: rockchip: fix up the frac clk get rate error Date: Thu, 16 May 2019 15:28:52 +0800 Message-Id: <1557991736-13580-3-git-send-email-zhangqing@rock-chips.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1557991736-13580-1-git-send-email-zhangqing@rock-chips.com> References: <1557991736-13580-1-git-send-email-zhangqing@rock-chips.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190516_002910_378120_BDCAD576 X-CRM114-Status: UNSURE ( 9.94 ) 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: , Cc: huangtao@rock-chips.com, xxx@rock-chips.com, xf@rock-chips.com, sboyd@kernel.org, mturquette@baylibre.com, Elaine Zhang , linux-kernel@vger.kernel.org, linux-rockchip@lists.infradead.org, linux-clk@vger.kernel.org, linux-arm-kernel@lists.infradead.org MIME-Version: 1.0 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 support fractional divider with only one level parent clock Signed-off-by: Elaine Zhang --- drivers/clk/rockchip/clk.c | 19 ++++++++++++------- 1 file changed, 12 insertions(+), 7 deletions(-) diff --git a/drivers/clk/rockchip/clk.c b/drivers/clk/rockchip/clk.c index e04bf300ea0a..0256a99f06f3 100644 --- a/drivers/clk/rockchip/clk.c +++ b/drivers/clk/rockchip/clk.c @@ -195,16 +195,21 @@ static void rockchip_fractional_approximation(struct clk_hw *hw, if (((rate * 20 > p_rate) && (p_rate % rate != 0)) || (fd->max_prate && fd->max_prate < p_rate)) { p_parent = clk_hw_get_parent(clk_hw_get_parent(hw)); - p_parent_rate = clk_hw_get_rate(p_parent); - *parent_rate = p_parent_rate; - if (fd->max_prate && p_parent_rate > fd->max_prate) { - div = DIV_ROUND_UP(p_parent_rate, fd->max_prate); - *parent_rate = p_parent_rate / div; + if (!p_parent) { + *parent_rate = p_rate; + } else { + p_parent_rate = clk_hw_get_rate(p_parent); + *parent_rate = p_parent_rate; + if (fd->max_prate && p_parent_rate > fd->max_prate) { + div = DIV_ROUND_UP(p_parent_rate, + fd->max_prate); + *parent_rate = p_parent_rate / div; + } } if (*parent_rate < rate * 20) { - pr_err("%s parent_rate(%ld) is low than rate(%ld)*20, fractional div is not allowed\n", - clk_hw_get_name(hw), *parent_rate, rate); + pr_warn("%s p_rate(%ld) is low than rate(%ld)*20, use integer or half-div\n", + clk_hw_get_name(hw), *parent_rate, rate); *m = 0; *n = 1; return;