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 X-Spam-Level: X-Spam-Status: No, score=-15.9 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_SANE_1 autolearn=unavailable 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 64881C4332F for ; Wed, 15 Sep 2021 16:11:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4ED4B60E94 for ; Wed, 15 Sep 2021 16:11:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229914AbhIOQMx (ORCPT ); Wed, 15 Sep 2021 12:12:53 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55476 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229536AbhIOQMv (ORCPT ); Wed, 15 Sep 2021 12:12:51 -0400 Received: from mail-pj1-x1029.google.com (mail-pj1-x1029.google.com [IPv6:2607:f8b0:4864:20::1029]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 97192C061574; Wed, 15 Sep 2021 09:11:32 -0700 (PDT) Received: by mail-pj1-x1029.google.com with SMTP id w19-20020a17090aaf9300b00191e6d10a19so2587374pjq.1; Wed, 15 Sep 2021 09:11:32 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=kQO6nJ7xYUr/Ykm70q0a3iQ3nfJt+frCs5YZoOVN9zY=; b=LsLZ53W19vXphqy0E7nrOjzeG2Wbsso/8h3TJIIfQQRuc0RUgbveL6lTIGCryK5ICK dH2BmynoDBTi13Srk/l05UDc7tV++8V9MfHd6mfmt2pVAbzr3mlqvcRvKKUh8pFKOoZ8 wW2ew25ZOQkBSXbDgqEfZHJ75rRJFC9eHN0Rq4SqWn5fGx2l+SbTSH9FB6bzcWnk7GiL OoPO5p8/W+2w+oW98TmIQmrAfw1wIr3CtAidISGz1qcygyjqeK/WUqaI82lDKe+gLvI6 EVVO7AWLx2ThQWqH/053b9kOTd6fFdc64DAAc5YK643X1SrL5wr7gPjKmuTHe9VB/zRS QyOA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=kQO6nJ7xYUr/Ykm70q0a3iQ3nfJt+frCs5YZoOVN9zY=; b=yNPsuqc9xqczy6dr1THQLQY/3KrbczB9cOpBXA9ltp4+xvzHJHHUn7uip8eRqmtrBg BJ6TAHpZlFFFSrHP8yAt0u4uYZ69BW+OIbyuAhZ25wbB40isvyMlpz9rAfSLWu/SCDPA E+7LGn55Uyuu+kGRJ4prREfoWGN99z2sm742RR6UIrDK8aSjcIgR9ZYAU+cwwXhgES36 ueLg9Vb2TPv+3aAQknb72+1fnq0G6MTxmoiYbM3g6W/TVn8ozUTYEcwVsW3gxl6xe3UM 8A25qeyQQBVjx9DrDOhzoeE3uaEudsbqGN8pfv9wcZ84Qorhcmq2BgiMFUTbFA7TgUqN gm3Q== X-Gm-Message-State: AOAM531G+ehNo6tGr2M60BKwablD5au3Z/uCbEwdcAVxm+oLP2LY0dCo VYeN9GbmyQSFlVMgwvBVNc5rLQiMQkY= X-Google-Smtp-Source: ABdhPJw/BYjCeW0zWZelSqU0PtOxUWW3Ypjbbznf/ZERjJWSgWst9vojOReseuHw30zHtMoa0FfIIg== X-Received: by 2002:a17:902:b696:b0:13a:7871:55f5 with SMTP id c22-20020a170902b69600b0013a787155f5mr404069pls.60.1631722291639; Wed, 15 Sep 2021 09:11:31 -0700 (PDT) Received: from [172.30.1.2] ([14.32.163.5]) by smtp.gmail.com with ESMTPSA id cm5sm200499pjb.24.2021.09.15.09.11.26 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 15 Sep 2021 09:11:31 -0700 (PDT) Subject: Re: [PATCH 3/6] clk: samsung: clk-pll: Implement pll0831x PLL type To: Sam Protsenko , Krzysztof Kozlowski , Sylwester Nawrocki , =?UTF-8?Q?Pawe=c5=82_Chmiel?= , Chanwoo Choi , Tomasz Figa , Rob Herring , Stephen Boyd , Michael Turquette Cc: Ryu Euiyoul , Tom Gall , Sumit Semwal , John Stultz , Amit Pundir , devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org, linux-samsung-soc@vger.kernel.org References: <20210914155607.14122-1-semen.protsenko@linaro.org> <20210914155607.14122-4-semen.protsenko@linaro.org> From: Chanwoo Choi Message-ID: Date: Thu, 16 Sep 2021 01:11:24 +0900 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.13.0 MIME-Version: 1.0 In-Reply-To: <20210914155607.14122-4-semen.protsenko@linaro.org> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 21. 9. 15. 오전 12:56, Sam Protsenko wrote: > pll0831x PLL is used in Exynos850 SoC for top-level fractional PLLs. The > code was derived from very similar pll36xx type, with next differences: > > 1. Lock time for pll0831x is 500*P_DIV, when for pll36xx it's 3000*P_DIV > 2. It's not suggested in Exynos850 TRM that S_DIV change doesn't require > performing PLL lock procedure (which is done in pll36xx > implementation) > 3. The offset from PMS-values register to K-value register is 0x8 for > pll0831x, when for pll36xx it's 0x4 > > When defining pll0831x type, CON3 register offset should be provided as > a "con" parameter of PLL() macro, like this: > > PLL(pll_0831x, 0, "fout_mmc_pll", "oscclk", > PLL_LOCKTIME_PLL_MMC, PLL_CON3_PLL_MMC, pll0831x_26mhz_tbl), > > To define PLL rates table, one can use PLL_36XX_RATE() macro, e.g.: > > PLL_36XX_RATE(26 * MHZ, 799999877, 31, 1, 0, -15124) > > as it's completely appropriate for pl0831x type and there is no sense in > duplicating that. > > If bit #1 (MANUAL_PLL_CTRL) is not set in CON1 register, it won't be > possible to set new rate, with next error showing in kernel log: > > Could not lock PLL fout_mmc_pll > > That can happen for example if bootloader clears that bit beforehand. > PLL driver doesn't account for that, so if MANUAL_PLL_CTRL bit was > cleared, it's assumed it was done for a reason and it shouldn't be > possible to change that PLL's rate at all. > > Signed-off-by: Sam Protsenko > --- > drivers/clk/samsung/clk-pll.c | 105 ++++++++++++++++++++++++++++++++++ > drivers/clk/samsung/clk-pll.h | 1 + > 2 files changed, 106 insertions(+) > > diff --git a/drivers/clk/samsung/clk-pll.c b/drivers/clk/samsung/clk-pll.c > index 03131b149c0b..83d1b03647db 100644 > --- a/drivers/clk/samsung/clk-pll.c > +++ b/drivers/clk/samsung/clk-pll.c > @@ -498,6 +498,103 @@ static const struct clk_ops samsung_pll0822x_clk_min_ops = { > .recalc_rate = samsung_pll0822x_recalc_rate, > }; > > +/* > + * PLL0831x Clock Type > + */ > +/* Maximum lock time can be 500 * PDIV cycles */ > +#define PLL0831X_LOCK_FACTOR (500) > + > +#define PLL0831X_KDIV_MASK (0xFFFF) > +#define PLL0831X_MDIV_MASK (0x1FF) > +#define PLL0831X_PDIV_MASK (0x3F) > +#define PLL0831X_SDIV_MASK (0x7) > +#define PLL0831X_MDIV_SHIFT (16) > +#define PLL0831X_PDIV_SHIFT (8) > +#define PLL0831X_SDIV_SHIFT (0) > +#define PLL0831X_KDIV_SHIFT (0) > +#define PLL0831X_LOCK_STAT_SHIFT (29) > +#define PLL0831X_ENABLE_SHIFT (31) > + > +static unsigned long samsung_pll0831x_recalc_rate(struct clk_hw *hw, > + unsigned long parent_rate) > +{ > + struct samsung_clk_pll *pll = to_clk_pll(hw); > + u32 mdiv, pdiv, sdiv, pll_con3, pll_con5; > + s16 kdiv; > + u64 fvco = parent_rate; > + > + pll_con3 = readl_relaxed(pll->con_reg); > + pll_con5 = readl_relaxed(pll->con_reg + 8); > + mdiv = (pll_con3 >> PLL0831X_MDIV_SHIFT) & PLL0831X_MDIV_MASK; > + pdiv = (pll_con3 >> PLL0831X_PDIV_SHIFT) & PLL0831X_PDIV_MASK; > + sdiv = (pll_con3 >> PLL0831X_SDIV_SHIFT) & PLL0831X_SDIV_MASK; > + kdiv = (s16)((pll_con5 >> PLL0831X_KDIV_SHIFT) & PLL0831X_KDIV_MASK); > + > + fvco *= (mdiv << 16) + kdiv; > + do_div(fvco, (pdiv << sdiv)); > + fvco >>= 16; > + > + return (unsigned long)fvco; > +} > + > +static int samsung_pll0831x_set_rate(struct clk_hw *hw, unsigned long drate, > + unsigned long parent_rate) > +{ > + const struct samsung_pll_rate_table *rate; > + struct samsung_clk_pll *pll = to_clk_pll(hw); > + u32 pll_con3, pll_con5; > + > + /* Get required rate settings from table */ > + rate = samsung_get_pll_settings(pll, drate); > + if (!rate) { > + pr_err("%s: Invalid rate : %lu for pll clk %s\n", __func__, > + drate, clk_hw_get_name(hw)); > + return -EINVAL; > + } > + > + pll_con3 = readl_relaxed(pll->con_reg); > + pll_con5 = readl_relaxed(pll->con_reg + 8); > + > + /* Change PLL PMSK values */ > + pll_con3 &= ~((PLL0831X_MDIV_MASK << PLL0831X_MDIV_SHIFT) | > + (PLL0831X_PDIV_MASK << PLL0831X_PDIV_SHIFT) | > + (PLL0831X_SDIV_MASK << PLL0831X_SDIV_SHIFT)); > + pll_con3 |= (rate->mdiv << PLL0831X_MDIV_SHIFT) | > + (rate->pdiv << PLL0831X_PDIV_SHIFT) | > + (rate->sdiv << PLL0831X_SDIV_SHIFT); > + pll_con5 &= ~(PLL0831X_KDIV_MASK << PLL0831X_KDIV_SHIFT); > + /* > + * kdiv is 16-bit 2's complement (s16), but stored as unsigned int. > + * Cast it to u16 to avoid leading 0xffff's in case of negative value. > + */ > + pll_con5 |= ((u16)rate->kdiv << PLL0831X_KDIV_SHIFT); > + > + /* Set PLL lock time */ > + writel_relaxed(rate->pdiv * PLL0831X_LOCK_FACTOR, pll->lock_reg); > + > + /* Write PMSK values */ > + writel_relaxed(pll_con3, pll->con_reg); > + writel_relaxed(pll_con5, pll->con_reg + 8); > + > + /* Wait for PLL lock if the PLL is enabled */ > + if (pll_con3 & BIT(pll->enable_offs)) > + return samsung_pll_lock_wait(pll, BIT(pll->lock_offs)); > + > + return 0; > +} > + > +static const struct clk_ops samsung_pll0831x_clk_ops = { > + .recalc_rate = samsung_pll0831x_recalc_rate, > + .set_rate = samsung_pll0831x_set_rate, > + .round_rate = samsung_pll_round_rate, > + .enable = samsung_pll3xxx_enable, > + .disable = samsung_pll3xxx_disable, > +}; > + > +static const struct clk_ops samsung_pll0831x_clk_min_ops = { > + .recalc_rate = samsung_pll0831x_recalc_rate, > +}; > + > /* > * PLL45xx Clock Type > */ > @@ -1407,6 +1504,14 @@ static void __init _samsung_clk_register_pll(struct samsung_clk_provider *ctx, > else > init.ops = &samsung_pll36xx_clk_ops; > break; > + case pll_0831x: > + pll->enable_offs = PLL0831X_ENABLE_SHIFT; > + pll->lock_offs = PLL0831X_LOCK_STAT_SHIFT; > + if (!pll->rate_table) > + init.ops = &samsung_pll0831x_clk_min_ops; > + else > + init.ops = &samsung_pll0831x_clk_ops; > + break; > case pll_6552: > case pll_6552_s3c2416: > init.ops = &samsung_pll6552_clk_ops; > diff --git a/drivers/clk/samsung/clk-pll.h b/drivers/clk/samsung/clk-pll.h > index 213e94a97f23..a739f2b7ae80 100644 > --- a/drivers/clk/samsung/clk-pll.h > +++ b/drivers/clk/samsung/clk-pll.h > @@ -37,6 +37,7 @@ enum samsung_pll_type { > pll_1452x, > pll_1460x, > pll_0822x, > + pll_0831x, > }; > > #define PLL_RATE(_fin, _m, _p, _s, _k, _ks) \ > Acked-by: Chanwoo Choi -- Best Regards, Samsung Electronics Chanwoo Choi 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 X-Spam-Level: X-Spam-Status: No, score=-13.9 required=3.0 tests=BAYES_00, 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-0700 (PDT) Received: from [172.30.1.2] ([14.32.163.5]) by smtp.gmail.com with ESMTPSA id cm5sm200499pjb.24.2021.09.15.09.11.26 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 15 Sep 2021 09:11:31 -0700 (PDT) Subject: Re: [PATCH 3/6] clk: samsung: clk-pll: Implement pll0831x PLL type To: Sam Protsenko , Krzysztof Kozlowski , Sylwester Nawrocki , =?UTF-8?Q?Pawe=c5=82_Chmiel?= , Chanwoo Choi , Tomasz Figa , Rob Herring , Stephen Boyd , Michael Turquette Cc: Ryu Euiyoul , Tom Gall , Sumit Semwal , John Stultz , Amit Pundir , devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org, linux-samsung-soc@vger.kernel.org References: <20210914155607.14122-1-semen.protsenko@linaro.org> <20210914155607.14122-4-semen.protsenko@linaro.org> From: Chanwoo Choi Message-ID: Date: Thu, 16 Sep 2021 01:11:24 +0900 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.13.0 MIME-Version: 1.0 In-Reply-To: <20210914155607.14122-4-semen.protsenko@linaro.org> Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210915_091132_686047_3AA293DB X-CRM114-Status: GOOD ( 36.81 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: base64 Content-Type: text/plain; charset="utf-8"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org T24gMjEuIDkuIDE1LiDsmKTsoIQgMTI6NTYsIFNhbSBQcm90c2Vua28gd3JvdGU6Cj4gcGxsMDgz MXggUExMIGlzIHVzZWQgaW4gRXh5bm9zODUwIFNvQyBmb3IgdG9wLWxldmVsIGZyYWN0aW9uYWwg UExMcy4gVGhlCj4gY29kZSB3YXMgZGVyaXZlZCBmcm9tIHZlcnkgc2ltaWxhciBwbGwzNnh4IHR5 cGUsIHdpdGggbmV4dCBkaWZmZXJlbmNlczoKPiAKPiAxLiBMb2NrIHRpbWUgZm9yIHBsbDA4MzF4 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