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Mon, 06 Nov 2023 11:52:57 +0000 Received: from nalasex01a.na.qualcomm.com (nalasex01a.na.qualcomm.com [10.47.209.196]) by NALASPPMTA01.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTPS id 3A6BquSX014855 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 6 Nov 2023 11:52:56 GMT Received: from hu-krichai-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 15.2.1118.39; Mon, 6 Nov 2023 03:52:50 -0800 From: Krishna chaitanya chundru Date: Mon, 6 Nov 2023 17:22:34 +0530 Subject: [PATCH 1/2] dt-bindings: phy: qcom,qmp: Add PCIe qcom,refclk-always-on property MIME-Version: 1.0 Message-ID: <20231106-refclk_always_on-v1-1-17a7fd8b532b@quicinc.com> References: <20231106-refclk_always_on-v1-0-17a7fd8b532b@quicinc.com> In-Reply-To: <20231106-refclk_always_on-v1-0-17a7fd8b532b@quicinc.com> To: Andy Gross , Bjorn Andersson , Konrad Dybcio , Vinod Koul , Kishon Vijay Abraham I , Rob Herring , Krzysztof Kozlowski , Conor Dooley CC: , , , , , , , , , , "Krishna chaitanya chundru" X-Mailer: b4 0.13-dev-83828 X-Developer-Signature: v=1; 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Mon, 06 Nov 2023 03:53:30 -0800 (PST) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1781815431189395166 X-GMAIL-MSGID: 1781815431189395166 Document qcom,refclk-always-on property which is needed in some platforms to supply refclk even in PCIe low power states. Signed-off-by: Krishna chaitanya chundru --- .../devicetree/bindings/phy/qcom,sc8280xp-qmp-pcie-phy.yaml | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/Documentation/devicetree/bindings/phy/qcom,sc8280xp-qmp-pcie-phy.yaml b/Documentation/devicetree/bindings/phy/qcom,sc8280xp-qmp-pcie-phy.yaml index 2c3d6553a7ba..9daf0556ed3b 100644 --- a/Documentation/devicetree/bindings/phy/qcom,sc8280xp-qmp-pcie-phy.yaml +++ b/Documentation/devicetree/bindings/phy/qcom,sc8280xp-qmp-pcie-phy.yaml @@ -93,6 +93,11 @@ properties: "#phy-cells": const: 0 + qcom,refclk-always-on: + type: boolean + description: A boolean property indicating the refclk is + always on even in Low power states (optional) + required: - compatible - reg From patchwork Mon Nov 6 11:52:35 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Krishna chaitanya chundru X-Patchwork-Id: 161958 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a59:8f47:0:b0:403:3b70:6f57 with SMTP id j7csp2600345vqu; Mon, 6 Nov 2023 03:53:33 -0800 (PST) X-Google-Smtp-Source: AGHT+IEBbvXfl41k/14BICsYwdPmoREcLOqeDL4+5dPBgAfTo0ZZ5tezspjM07Hd3xTNnzdq1+7n X-Received: by 2002:a05:6a00:190b:b0:6bd:a8a3:cc59 with SMTP id y11-20020a056a00190b00b006bda8a3cc59mr31737799pfi.24.1699271613426; Mon, 06 Nov 2023 03:53:33 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1699271613; cv=none; d=google.com; s=arc-20160816; b=C4zZ1CC3j5/SNHxrcsSlgTvc8nPilcHYLVNFFfhHQR5JG8TQpsUTzwAUSeCxYjfLKK XFx+EuM1fOCh6ZcquluoDPGFDt1jQeJCDOBpSc2nfmBSCR5iJBtGlXilHQfMm04GMOyS 7Yp7+K+uDN9mmsYLJY4BEilvvEmy0HzYx9GfnbOn0BR2Oux1xev9mOs7sBTG8S6XRTQA NPy0IH/8ilirDsEIoX/2J5bjmFcC/aEsFvwzjnwGKw8xkJWSj5V4G5nFMWPhEkHrwX81 V4mCzNKf27Ev+QZU5R3K1vExoAz0RhS3DnRI/q7z3hy4rMnBxmpN8Xqwfgv7LuBSlGtR f7Rw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:cc:to:in-reply-to:references:message-id :content-transfer-encoding:mime-version:subject:date:from :dkim-signature; bh=1tQZ31Of8xJt0eEt4Gtg8plvRxa6YFAbkNUQasMTork=; fh=EFIAKKtQRIe9H8zeoA9xLqoI3gyQkUU8ZMs+AiKe2pw=; b=bDAOX7rpaYzUfXT5xGFabkzr/Wo7jDqcisxPqo6OoOLyiHnubdPi3jYO0FBAsFnDWP yWXiQIj/hoMY1JdQooFr1Gx9TLoEbfBvw/7UONqcUtat8z1vk3W3UvMEa/RKkvMW3y5e Fd51TtKwRiVfmnYrNwt+kEEDpQIVyqnegNlK6/JnHhbr2mH1r2DrSyzuWX+J3pSlA4RD qQNoDPydEZO3FL6iTXKSeBIMLJJwmPRr1pl0b1XXfwaRJxVByrgXjL0qk3Ev0tImVjTU IDxgdhqbWM00PfQgnVtWHXTqdBmJOFGbWIVb2/djlvjk5t6BRmlUTv06mMipig4ImQbz 19nw== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@quicinc.com header.s=qcppdkim1 header.b=dPbnJS75; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.37 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=quicinc.com Received: from snail.vger.email (snail.vger.email. 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Mon, 06 Nov 2023 11:53:02 +0000 Received: from nalasex01a.na.qualcomm.com (nalasex01a.na.qualcomm.com [10.47.209.196]) by NALASPPMTA05.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTPS id 3A6Br26q016657 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 6 Nov 2023 11:53:02 GMT Received: from hu-krichai-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 15.2.1118.39; Mon, 6 Nov 2023 03:52:56 -0800 From: Krishna chaitanya chundru Date: Mon, 6 Nov 2023 17:22:35 +0530 Subject: [PATCH 2/2] phy: qcom-qmp-pcie: Add support for keeping refclk always on MIME-Version: 1.0 Message-ID: <20231106-refclk_always_on-v1-2-17a7fd8b532b@quicinc.com> References: <20231106-refclk_always_on-v1-0-17a7fd8b532b@quicinc.com> In-Reply-To: <20231106-refclk_always_on-v1-0-17a7fd8b532b@quicinc.com> To: Andy Gross , Bjorn Andersson , Konrad Dybcio , Vinod Koul , Kishon Vijay Abraham I , Rob Herring , Krzysztof Kozlowski , Conor Dooley CC: , , , , , , , , , , "Krishna chaitanya chundru" X-Mailer: b4 0.13-dev-83828 X-Developer-Signature: v=1; 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Mon, 06 Nov 2023 03:53:32 -0800 (PST) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1781815430886920891 X-GMAIL-MSGID: 1781815430886920891 In PCIe low power states like L1.1 or L1.2 the phy will stop supplying refclk to endpoint. If endpoint asserts clkreq to bring back link L0, then RC needs to provide refclk to endpoint. If there is some issues in platform with clkreq signal propagation to host and due to that host will not send refclk which results PCIe link down. For those platforms phy needs to provide refclk even in low power states. Add a flag which indicates refclk is always supplied to endpoint. Signed-off-by: Krishna chaitanya chundru --- drivers/phy/qualcomm/phy-qcom-qmp-pcie.c | 21 +++++++++++++++++---- 1 file changed, 17 insertions(+), 4 deletions(-) diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c b/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c index a63ca7424974..d7e377a7d96e 100644 --- a/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c +++ b/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c @@ -43,6 +43,8 @@ /* QPHY_PCS_STATUS bit */ #define PHYSTATUS BIT(6) #define PHYSTATUS_4_20 BIT(7) +/* PCS_PCIE_ENDPOINT_REFCLK_CNTRL */ +#define EPCLK_ALWAYS_ON_EN BIT(6) #define PHY_INIT_COMPLETE_TIMEOUT 10000 @@ -77,6 +79,7 @@ enum qphy_reg_layout { QPHY_START_CTRL, QPHY_PCS_STATUS, QPHY_PCS_POWER_DOWN_CONTROL, + QPHY_PCS_ENDPOINT_REFCLK_CNTRL, /* Keep last to ensure regs_layout arrays are properly initialized */ QPHY_LAYOUT_SIZE }; @@ -103,10 +106,11 @@ static const unsigned int sdm845_qhp_pciephy_regs_layout[QPHY_LAYOUT_SIZE] = { }; static const unsigned int pciephy_v4_regs_layout[QPHY_LAYOUT_SIZE] = { - [QPHY_SW_RESET] = QPHY_V4_PCS_SW_RESET, - [QPHY_START_CTRL] = QPHY_V4_PCS_START_CONTROL, - [QPHY_PCS_STATUS] = QPHY_V4_PCS_PCS_STATUS1, - [QPHY_PCS_POWER_DOWN_CONTROL] = QPHY_V4_PCS_POWER_DOWN_CONTROL, + [QPHY_SW_RESET] = QPHY_V4_PCS_SW_RESET, + [QPHY_START_CTRL] = QPHY_V4_PCS_START_CONTROL, + [QPHY_PCS_STATUS] = QPHY_V4_PCS_PCS_STATUS1, + [QPHY_PCS_POWER_DOWN_CONTROL] = QPHY_V4_PCS_POWER_DOWN_CONTROL, + [QPHY_PCS_ENDPOINT_REFCLK_CNTRL] = QPHY_V4_PCS_PCIE_ENDPOINT_REFCLK_CNTRL, }; static const unsigned int pciephy_v5_regs_layout[QPHY_LAYOUT_SIZE] = { @@ -2244,6 +2248,8 @@ struct qmp_pcie { struct phy *phy; int mode; + bool refclk_always_on; + struct clk_fixed_rate pipe_clk_fixed; }; @@ -3159,6 +3165,10 @@ static void qmp_pcie_init_registers(struct qmp_pcie *qmp, const struct qmp_phy_c qmp_pcie_configure(pcs, tbls->pcs, tbls->pcs_num); qmp_pcie_configure(pcs_misc, tbls->pcs_misc, tbls->pcs_misc_num); + if (qmp->refclk_always_on && cfg->regs[QPHY_PCS_ENDPOINT_REFCLK_CNTRL]) + qphy_setbits(pcs_misc, cfg->regs[QPHY_PCS_ENDPOINT_REFCLK_CNTRL], + EPCLK_ALWAYS_ON_EN); + if (cfg->lanes >= 4 && qmp->tcsr_4ln_config) { qmp_pcie_configure(serdes, cfg->serdes_4ln_tbl, cfg->serdes_4ln_num); qmp_pcie_init_port_b(qmp, tbls); @@ -3681,6 +3691,9 @@ static int qmp_pcie_probe(struct platform_device *pdev) if (ret) goto err_node_put; + qmp->refclk_always_on = of_property_read_bool(dev->of_node, + "qcom,refclk-always-on"); + ret = phy_pipe_clk_register(qmp, np); if (ret) goto err_node_put;