From patchwork Fri Oct 18 19:15:38 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Taniya Das X-Patchwork-Id: 13842279 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id BEA8ED3E189 for ; Fri, 18 Oct 2024 19:28:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:CC:To:In-Reply-To:References :Message-ID:Content-Transfer-Encoding:Content-Type:MIME-Version:Subject:Date: From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=nxM8Y+Bt7L65cFGgUqb5swxflPoed6e6iuhemXfVjJE=; b=WrVn+c3JK2dLODU17aGcGY+MBp H65M+o7MwSy5a+u8Td/xrwe8M+093o0xOkWFMEQNrj/MmqCuXRfSuhXig/QPQb1WQNE3umKsl+Sh7 ykIQ7L1nRk6+bR+K7/RWJ1qDmAy0lNpWiF4iwTT8hV8Zm7MR23kEPUmYKoxU3JGCaNg4iotKOznvl wKc1LY7gnvwV46CCJRdH7WggNcTBGS7Mhdho5mn7VJ1sNZwK5Fh+VFi4c0iY0XDxGs4psOGe2Ow0G IsmQAeXv803uTsfjhr0Oqcg5dIZttdk2rAisw7oIxUFB5kaC7xwPsLOKRIjR6es3ilBApsxtVO2wk XufDPfvA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1t1se6-00000001nWK-0zAL; Fri, 18 Oct 2024 19:28:22 +0000 Received: from mx0b-0031df01.pphosted.com ([205.220.180.131]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1t1sSb-00000001ln6-2l24 for linux-arm-kernel@lists.infradead.org; Fri, 18 Oct 2024 19:16:31 +0000 Received: from pps.filterd (m0279869.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 49I9GP3f005787; Fri, 18 Oct 2024 19:16:03 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; h= cc:content-transfer-encoding:content-type:date:from:in-reply-to :message-id:mime-version:references:subject:to; s=qcppdkim1; bh= nxM8Y+Bt7L65cFGgUqb5swxflPoed6e6iuhemXfVjJE=; b=QjopKNf+LKHbSWzQ Fw4dGl/ZRTg0msO7n10axqXHpGvDQXcsqA62UjPM4ucfasRm+Mb89Ha5CQxyNV4W 23gDhkVqLjAUXDyChHxNp5F473+9UTnYVMRPoWpYh7zwpFXy6FaYAaV3+Zc08Euf PTs2w3uVcIsOEvLhOI/yjpOLpNJGyk/FNFG0O5dDwsTWGl8W5APwmbNZsaMJS2hU 0HgPEGTYKnnCVY6fQ0UmlxXcJ1AvUnck3MDgotPkmq8glXBW2BG3L3zK6ElCWYaO 1FTWh8BZpYAp2Q4z0GicWU2AvwZUdvA57jBNSN+VtEda1xHjUBGvxm6honwFcYjc zAqRVw== Received: from nalasppmta02.qualcomm.com (Global_NAT1.qualcomm.com [129.46.96.20]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 42b8rr3g6k-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 18 Oct 2024 19:16:02 +0000 (GMT) Received: from nalasex01a.na.qualcomm.com (nalasex01a.na.qualcomm.com [10.47.209.196]) by NALASPPMTA02.qualcomm.com (8.18.1.2/8.18.1.2) with ESMTPS id 49IJG18n001974 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 18 Oct 2024 19:16:01 GMT Received: from hu-tdas-hyd.qualcomm.com (10.80.80.8) by nalasex01a.na.qualcomm.com (10.47.209.196) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.9; Fri, 18 Oct 2024 12:15:55 -0700 From: Taniya Das Date: Sat, 19 Oct 2024 00:45:38 +0530 Subject: [PATCH 02/11] clk: qcom: clk-alpha-pll: Add support for dynamic update for slewing PLLs MIME-Version: 1.0 Message-ID: <20241019-qcs615-mm-clockcontroller-v1-2-4cfb96d779ae@quicinc.com> References: <20241019-qcs615-mm-clockcontroller-v1-0-4cfb96d779ae@quicinc.com> In-Reply-To: <20241019-qcs615-mm-clockcontroller-v1-0-4cfb96d779ae@quicinc.com> To: Bjorn Andersson , Michael Turquette , Stephen Boyd , Abhishek Sahu , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Catalin Marinas , Will Deacon CC: Ajit Pandey , Imran Shaik , Jagadeesh Kona , "Stephen Boyd" , , , , , , "Taniya Das" X-Mailer: b4 0.15-dev-aa3f6 X-Originating-IP: [10.80.80.8] X-ClientProxiedBy: nasanex01b.na.qualcomm.com (10.46.141.250) To nalasex01a.na.qualcomm.com (10.47.209.196) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-GUID: Mw9jmvOw60CmK0OmqMwuVa09wgzXuaba X-Proofpoint-ORIG-GUID: Mw9jmvOw60CmK0OmqMwuVa09wgzXuaba X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.60.29 definitions=2024-09-06_09,2024-09-06_01,2024-09-02_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 lowpriorityscore=0 bulkscore=0 spamscore=0 mlxlogscore=999 clxscore=1015 mlxscore=0 suspectscore=0 phishscore=0 malwarescore=0 adultscore=0 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2409260000 definitions=main-2410180123 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241018_121629_834645_41C33B10 X-CRM114-Status: GOOD ( 21.28 ) 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: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org The alpha PLLs which slew to a new frequency at runtime would require the PLL to calibrate at the mid point of the VCO. Add the new PLL ops which can support the slewing of the PLL to a new frequency. Signed-off-by: Taniya Das --- drivers/clk/qcom/clk-alpha-pll.c | 172 +++++++++++++++++++++++++++++++++++++++ drivers/clk/qcom/clk-alpha-pll.h | 1 + 2 files changed, 173 insertions(+) diff --git a/drivers/clk/qcom/clk-alpha-pll.c b/drivers/clk/qcom/clk-alpha-pll.c index 03cc7aa092480bfdd9eaa986d44f0545944b3b89..6f51bdd2b500ceeccbca0aefd5003df10ad1e1ae 100644 --- a/drivers/clk/qcom/clk-alpha-pll.c +++ b/drivers/clk/qcom/clk-alpha-pll.c @@ -2758,3 +2758,175 @@ const struct clk_ops clk_alpha_pll_regera_ops = { .set_rate = clk_zonda_pll_set_rate, }; EXPORT_SYMBOL_GPL(clk_alpha_pll_regera_ops); + +static int clk_alpha_pll_slew_update(struct clk_alpha_pll *pll) +{ + int ret = 0; + u32 val; + + regmap_update_bits(pll->clkr.regmap, PLL_MODE(pll), PLL_UPDATE, PLL_UPDATE); + regmap_read(pll->clkr.regmap, PLL_MODE(pll), &val); + + ret = wait_for_pll_update(pll); + if (ret) + return ret; + /* + * Hardware programming mandates a wait of at least 570ns before polling the LOCK + * detect bit. Have a delay of 1us just to be safe. + */ + mb(); + udelay(1); + + return wait_for_pll_enable_lock(pll); +} + +static int clk_alpha_pll_slew_set_rate(struct clk_hw *hw, unsigned long rate, + unsigned long parent_rate) +{ + struct clk_alpha_pll *pll = to_clk_alpha_pll(hw); + unsigned long freq_hz; + const struct pll_vco *curr_vco, *vco; + u32 l, alpha_width = pll_alpha_width(pll); + u64 a; + + freq_hz = alpha_pll_round_rate(rate, parent_rate, &l, &a, alpha_width); + if (freq_hz != rate) { + pr_err("alpha_pll: Call clk_set_rate with rounded rates!\n"); + return -EINVAL; + } + + curr_vco = alpha_pll_find_vco(pll, clk_hw_get_rate(hw)); + if (!curr_vco) { + pr_err("alpha pll: not in a valid vco range\n"); + return -EINVAL; + } + + vco = alpha_pll_find_vco(pll, freq_hz); + if (!vco) { + pr_err("alpha pll: not in a valid vco range\n"); + return -EINVAL; + } + + /* + * Dynamic pll update will not support switching frequencies across + * vco ranges. In those cases fall back to normal alpha set rate. + */ + if (curr_vco->val != vco->val) + return clk_alpha_pll_set_rate(hw, rate, parent_rate); + + a = a << (ALPHA_REG_BITWIDTH - ALPHA_BITWIDTH); + + regmap_write(pll->clkr.regmap, PLL_L_VAL(pll), l); + regmap_write(pll->clkr.regmap, PLL_ALPHA_VAL(pll), a); + regmap_write(pll->clkr.regmap, PLL_ALPHA_VAL_U(pll), a >> 32); + + /* Ensure that the write above goes through before proceeding. */ + mb(); + + if (clk_hw_is_enabled(hw)) + return clk_alpha_pll_slew_update(pll); + + return 0; +} + +/* + * Slewing plls should be bought up at frequency which is in the middle of the + * desired VCO range. So after bringing up the pll at calibration freq, set it + * back to desired frequency(that was set by previous clk_set_rate). + */ +static int clk_alpha_pll_calibrate(struct clk_hw *hw) +{ + unsigned long calibration_freq, freq_hz; + struct clk_alpha_pll *pll = to_clk_alpha_pll(hw); + struct clk_hw *parent; + const struct pll_vco *vco; + u64 a; + u32 l, alpha_width = pll_alpha_width(pll); + int rc; + + parent = clk_hw_get_parent(hw); + if (!parent) { + pr_err("alpha pll: no valid parent found\n"); + return -EINVAL; + } + + vco = alpha_pll_find_vco(pll, clk_hw_get_rate(hw)); + if (!vco) { + pr_err("alpha pll: not in a valid vco range\n"); + return -EINVAL; + } + + /* + * As during slewing plls vco_sel won't be allowed to change, vco table + * should have only one entry table, i.e. index = 0, find the + * calibration frequency. + */ + calibration_freq = (pll->vco_table[0].min_freq + pll->vco_table[0].max_freq) / 2; + + freq_hz = alpha_pll_round_rate(calibration_freq, clk_hw_get_rate(parent), + &l, &a, alpha_width); + if (freq_hz != calibration_freq) { + pr_err("alpha_pll: call clk_set_rate with rounded rates!\n"); + return -EINVAL; + } + + /* Setup PLL for calibration frequency */ + a <<= (ALPHA_REG_BITWIDTH - ALPHA_BITWIDTH); + + regmap_write(pll->clkr.regmap, PLL_L_VAL(pll), l); + regmap_write(pll->clkr.regmap, PLL_ALPHA_VAL(pll), a); + regmap_write(pll->clkr.regmap, PLL_ALPHA_VAL_U(pll), a >> 32); + + regmap_update_bits(pll->clkr.regmap, PLL_USER_CTL(pll), PLL_VCO_MASK << PLL_VCO_SHIFT, + vco->val << PLL_VCO_SHIFT); + + /* Bringup the pll at calibration frequency */ + rc = clk_alpha_pll_enable(hw); + if (rc) { + pr_err("alpha pll calibration failed\n"); + return rc; + } + + /* + * PLL is already running at calibration frequency. + * So slew pll to the previously set frequency. + */ + freq_hz = alpha_pll_round_rate(clk_hw_get_rate(hw), + clk_hw_get_rate(parent), &l, &a, alpha_width); + + pr_debug("pll %s: setting back to required rate %lu, freq_hz %ld\n", + clk_hw_get_name(hw), clk_hw_get_rate(hw), freq_hz); + + /* Setup the PLL for the new frequency */ + a <<= (ALPHA_REG_BITWIDTH - ALPHA_BITWIDTH); + + regmap_write(pll->clkr.regmap, PLL_L_VAL(pll), l); + regmap_write(pll->clkr.regmap, PLL_ALPHA_VAL(pll), a); + regmap_write(pll->clkr.regmap, PLL_ALPHA_VAL_U(pll), a >> 32); + + regmap_update_bits(pll->clkr.regmap, PLL_USER_CTL(pll), PLL_ALPHA_EN, PLL_ALPHA_EN); + + return clk_alpha_pll_slew_update(pll); +} + +static int clk_alpha_pll_slew_enable(struct clk_hw *hw) +{ + int rc; + + rc = clk_alpha_pll_calibrate(hw); + if (rc) + return rc; + + rc = clk_alpha_pll_enable(hw); + + return rc; +} + +const struct clk_ops clk_alpha_pll_slew_ops = { + .enable = clk_alpha_pll_slew_enable, + .disable = clk_alpha_pll_disable, + .recalc_rate = clk_alpha_pll_recalc_rate, + .round_rate = clk_alpha_pll_round_rate, + .set_rate = clk_alpha_pll_slew_set_rate, +}; +EXPORT_SYMBOL(clk_alpha_pll_slew_ops); diff --git a/drivers/clk/qcom/clk-alpha-pll.h b/drivers/clk/qcom/clk-alpha-pll.h index 55eca04b23a1fc3f3554f43a8fdd329a524dad0e..f149d10247bd4a85521940a1255cd019bde4729a 100644 --- a/drivers/clk/qcom/clk-alpha-pll.h +++ b/drivers/clk/qcom/clk-alpha-pll.h @@ -195,6 +195,7 @@ extern const struct clk_ops clk_alpha_pll_rivian_evo_ops; #define clk_alpha_pll_postdiv_rivian_evo_ops clk_alpha_pll_postdiv_fabia_ops extern const struct clk_ops clk_alpha_pll_regera_ops; +extern const struct clk_ops clk_alpha_pll_slew_ops; void clk_alpha_pll_configure(struct clk_alpha_pll *pll, struct regmap *regmap, const struct alpha_pll_config *config);