From patchwork Wed Sep 30 15:28:37 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sakari Ailus X-Patchwork-Id: 255524 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=-13.0 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, 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 21BA9C4727C for ; Wed, 30 Sep 2020 15:29:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CAEA920789 for ; Wed, 30 Sep 2020 15:29:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731099AbgI3P3b (ORCPT ); Wed, 30 Sep 2020 11:29:31 -0400 Received: from retiisi.org.uk ([95.216.213.190]:44680 "EHLO hillosipuli.retiisi.eu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731044AbgI3P3P (ORCPT ); Wed, 30 Sep 2020 11:29:15 -0400 Received: from lanttu.localdomain (lanttu-e.localdomain [192.168.1.64]) by hillosipuli.retiisi.eu (Postfix) with ESMTP id 0E6C6634CBD for ; Wed, 30 Sep 2020 18:28:53 +0300 (EEST) From: Sakari Ailus To: linux-media@vger.kernel.org Subject: [PATCH 079/100] ccs-pll: Fix VT post-PLL divisor calculation Date: Wed, 30 Sep 2020 18:28:37 +0300 Message-Id: <20200930152858.8471-80-sakari.ailus@linux.intel.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20200930152858.8471-1-sakari.ailus@linux.intel.com> References: <20200930152858.8471-1-sakari.ailus@linux.intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org The PLL calculator only searched even total divisor values apart from one, but this is wrong: the total divisor is odd in cases where system divisor is one. Fix this by including odd total PLL values where system divisor is one to the search. Signed-off-by: Sakari Ailus --- drivers/media/i2c/ccs-pll.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) diff --git a/drivers/media/i2c/ccs-pll.c b/drivers/media/i2c/ccs-pll.c index c0f3f68e55d8..52dea3894229 100644 --- a/drivers/media/i2c/ccs-pll.c +++ b/drivers/media/i2c/ccs-pll.c @@ -347,14 +347,16 @@ ccs_pll_calculate_vt(struct device *dev, const struct ccs_pll_limits *lim, * into a value which is not smaller than div, the desired * divisor. */ - for (vt_div = min_vt_div; vt_div <= max_vt_div; - vt_div += 2 - (vt_div & 1)) { - for (sys_div = min_sys_div; - sys_div <= max_sys_div; + for (vt_div = min_vt_div; vt_div <= max_vt_div; vt_div++) { + uint16_t __max_sys_div = vt_div & 1 ? 1 : max_sys_div; + + for (sys_div = min_sys_div; sys_div <= __max_sys_div; sys_div += 2 - (sys_div & 1)) { - uint16_t pix_div = DIV_ROUND_UP(vt_div, sys_div); + uint16_t pix_div; uint16_t rounded_div; + pix_div = DIV_ROUND_UP(vt_div, sys_div); + if (pix_div < lim->vt_bk.min_pix_clk_div || pix_div > lim->vt_bk.max_pix_clk_div) { dev_dbg(dev,