From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9C55FC41535 for ; Tue, 12 Apr 2022 01:08:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1346787AbiDLBIN (ORCPT ); Mon, 11 Apr 2022 21:08:13 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34894 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1348558AbiDLA7W (ORCPT ); Mon, 11 Apr 2022 20:59:22 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D3A4B37A00; Mon, 11 Apr 2022 17:52:39 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 3C6D3B819C5; Tue, 12 Apr 2022 00:52:38 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 17F15C385AA; Tue, 12 Apr 2022 00:52:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1649724757; bh=rHmNXuzeV8iJKUzH6+x3ln2ySZEFmVKkG1uO2fuHIks=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Rg9BwiECKv40znIioakWvAI06T91HqJEnu4QM9E/kwlgT5F7MAQYAVSABXwmEnWSF zlnACVf+3eNKBo6ZNBVsZjpAIi8phvhjp7Cazw7XpsKORgqshC6Dq8Khgz+TEReiZF 7wZKUJwzk+m1saSghJu94nYSw7LJe00Q3yL/CnyE50jfTO8+wtDYJWwgghRO18hy/+ +lNf7+dZAHB84tT3mSiRk7f7OFrcomeGc/erHkU6ArYcREpneA5T7iPDj/3nmd/6uH KT6B2hXsTiYh4fZE96nPNt7N9SqF9hgCiNtZJGsvnt+8SDjbax8f2i1tkgtCLdGdI7 rsQOYLGgoAANw== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Leo Ruan , Mark Jonas , Philipp Zabel , Sasha Levin , airlied@linux.ie, daniel@ffwll.ch, dri-devel@lists.freedesktop.org Subject: [PATCH AUTOSEL 4.14 08/11] gpu: ipu-v3: Fix dev_dbg frequency output Date: Mon, 11 Apr 2022 20:52:17 -0400 Message-Id: <20220412005222.351554-8-sashal@kernel.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220412005222.351554-1-sashal@kernel.org> References: <20220412005222.351554-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Leo Ruan [ Upstream commit 070a88fd4a03f921b73a2059e97d55faaa447dab ] This commit corrects the printing of the IPU clock error percentage if it is between -0.1% to -0.9%. For example, if the pixel clock requested is 27.2 MHz but only 27.0 MHz can be achieved the deviation is -0.8%. But the fixed point math had a flaw and calculated error of 0.2%. Before: Clocks: IPU 270000000Hz DI 24716667Hz Needed 27200000Hz IPU clock can give 27000000 with divider 10, error 0.2% Want 27200000Hz IPU 270000000Hz DI 24716667Hz using IPU, 27000000Hz After: Clocks: IPU 270000000Hz DI 24716667Hz Needed 27200000Hz IPU clock can give 27000000 with divider 10, error -0.8% Want 27200000Hz IPU 270000000Hz DI 24716667Hz using IPU, 27000000Hz Signed-off-by: Leo Ruan Signed-off-by: Mark Jonas Reviewed-by: Philipp Zabel Signed-off-by: Philipp Zabel Link: https://lore.kernel.org/r/20220207151411.5009-1-mark.jonas@de.bosch.com Signed-off-by: Sasha Levin --- drivers/gpu/ipu-v3/ipu-di.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/ipu-v3/ipu-di.c b/drivers/gpu/ipu-v3/ipu-di.c index d2f1bd9d3deb..c498dc7d8838 100644 --- a/drivers/gpu/ipu-v3/ipu-di.c +++ b/drivers/gpu/ipu-v3/ipu-di.c @@ -460,8 +460,9 @@ static void ipu_di_config_clock(struct ipu_di *di, error = rate / (sig->mode.pixelclock / 1000); - dev_dbg(di->ipu->dev, " IPU clock can give %lu with divider %u, error %d.%u%%\n", - rate, div, (signed)(error - 1000) / 10, error % 10); + dev_dbg(di->ipu->dev, " IPU clock can give %lu with divider %u, error %c%d.%d%%\n", + rate, div, error < 1000 ? '-' : '+', + abs(error - 1000) / 10, abs(error - 1000) % 10); /* Allow a 1% error */ if (error < 1010 && error >= 990) { -- 2.35.1