From patchwork Mon Nov 28 11:12:03 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Caesar Wang X-Patchwork-Id: 9449325 X-Patchwork-Delegate: eduardo.valentin@ti.com Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id EE95360757 for ; Mon, 28 Nov 2016 11:13:32 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id DCEDB26E64 for ; Mon, 28 Nov 2016 11:13:32 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id D178A2574A; Mon, 28 Nov 2016 11:13:32 +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=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 876C7269DA for ; Mon, 28 Nov 2016 11:13:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932883AbcK1LM4 (ORCPT ); Mon, 28 Nov 2016 06:12:56 -0500 Received: from mail-pf0-f195.google.com ([209.85.192.195]:36254 "EHLO mail-pf0-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932837AbcK1LMp (ORCPT ); Mon, 28 Nov 2016 06:12:45 -0500 Received: by mail-pf0-f195.google.com with SMTP id c4so6340905pfb.3; Mon, 28 Nov 2016 03:12:45 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=a9fS1jr9PSDvkxjnXN+WmK/oqrB/5youFxR1EZtD30Y=; b=ZRgui+33KwLc6q3P8YN4JZo8ysCCb5/vohON1Sm47wE3I9a34MDJtTdqFEMD2dXYqh t2YcdPI0J7/JrxnlhdakDuCemUtodLCZWmKrqCcXEyNyQJrOXJcoegUMqLQIXQUvmMuz gLErCvrA1kh6OoWgFy1lT9XF1AwPfjQwkGahMvDrenPQ6hhRnyIhjef5/JPEVOhdZF7K XkqqoInm8uWfU+QtBV0/FscFw/p2fq90oTmbfZ2QvEBwrKYtE0Yvbv0h33C3i6hixH0j qCvRglHMUnahSuMrjFtc7JYSf6jm5BKxO+/nC63DjQsfKJIJiekWneZNSMVS/d3Amrzd bIbA== X-Gm-Message-State: AKaTC00RV2u6OzaBELkCUTDMOcQG2+pLsM0Gq8tHSIovhVgDD4E6Z7uq/FfZgAWgSIvFgg== X-Received: by 10.98.69.133 with SMTP id n5mr21392624pfi.160.1480331564842; Mon, 28 Nov 2016 03:12:44 -0800 (PST) Received: from localhost.localdomain ([103.29.142.67]) by smtp.gmail.com with ESMTPSA id y20sm86586905pfj.26.2016.11.28.03.12.42 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Mon, 28 Nov 2016 03:12:44 -0800 (PST) From: Caesar Wang To: rui.zhang@intel.com, edubezval@gmail.com Cc: heiko@sntech.de, smbarber@chromium.org, briannorris@chromium.org, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, linux-rockchip@lists.infradead.org, Caesar Wang Subject: [PATCH v3 4/5] thermal: rockchip: optimize the conversion table Date: Mon, 28 Nov 2016 19:12:03 +0800 Message-Id: <1480331524-18741-5-git-send-email-wxt@rock-chips.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1480331524-18741-1-git-send-email-wxt@rock-chips.com> References: <1480331524-18741-1-git-send-email-wxt@rock-chips.com> Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP In order to support the valid temperature can conver to analog value. The rockchip thermal driver has not supported the all valid temperature to convert the analog value. (e.g.: 61C, 62C, 63C....) For example: In some cases, we need adjust the trip point. $cd /sys/class/thermal/thermal_zone* $echo 68000 > trip_point_0_temp That will return the max analogic value indicates the invalid before posting this patch. So, this patch will optimize the conversion table to support the other cases. Signed-off-by: Caesar Wang Reviewed-by: Brian Norris --- Changes in v3: None Changes in v2: - improve the commit as Brian commnets on https://patchwork.kernel.org/patch/9440985 Changes in v1: None drivers/thermal/rockchip_thermal.c | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) diff --git a/drivers/thermal/rockchip_thermal.c b/drivers/thermal/rockchip_thermal.c index ca1730e..660ed3b 100644 --- a/drivers/thermal/rockchip_thermal.c +++ b/drivers/thermal/rockchip_thermal.c @@ -401,6 +401,8 @@ static u32 rk_tsadcv2_temp_to_code(const struct chip_tsadc_table *table, int temp) { int high, low, mid; + unsigned long num; + unsigned int denom; u32 error = table->data_mask; low = 0; @@ -421,6 +423,27 @@ static u32 rk_tsadcv2_temp_to_code(const struct chip_tsadc_table *table, mid = (low + high) / 2; } + /* + * The conversion code granularity provided by the table. Let's + * assume that the relationship between temperature and + * analog value between 2 table entries is linear and interpolate + * to produce less granular result. + */ + num = abs(table->id[mid].code - table->id[mid + 1].code); + num *= temp - table->id[mid].temp; + denom = table->id[mid + 1].temp - table->id[mid].temp; + + switch (table->mode) { + case ADC_DECREMENT: + return table->id[mid].code - (num / denom); + case ADC_INCREMENT: + return table->id[mid].code + (num / denom); + default: + pr_err("%s: invalid conversion table, mode=%d\n", + __func__, table->mode); + return error; + } + exit: pr_err("%s: invalid temperature, temp=%d error=%d\n", __func__, temp, error);