From patchwork Tue Sep 20 10:22:26 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Krishna Chaitanya Chundru X-Patchwork-Id: 12981836 X-Patchwork-Delegate: lorenzo.pieralisi@arm.com 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 607C3C6FA8E for ; Tue, 20 Sep 2022 10:22:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229971AbiITKW4 (ORCPT ); Tue, 20 Sep 2022 06:22:56 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58288 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229598AbiITKWz (ORCPT ); Tue, 20 Sep 2022 06:22:55 -0400 Received: from mx0b-0031df01.pphosted.com (mx0b-0031df01.pphosted.com [205.220.180.131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 186FA6C105; 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Tue, 20 Sep 2022 10:22:34 +0000 Received: from pps.filterd (APBLRPPMTA01.qualcomm.com [127.0.0.1]) by APBLRPPMTA01.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTP id 28KAMUpv016172; Tue, 20 Sep 2022 10:22:31 GMT Received: from pps.reinject (localhost [127.0.0.1]) by APBLRPPMTA01.qualcomm.com (PPS) with ESMTPS id 3jnqrbnbqy-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Tue, 20 Sep 2022 10:22:31 +0000 Received: from APBLRPPMTA01.qualcomm.com (APBLRPPMTA01.qualcomm.com [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 28KAMUgh016182; Tue, 20 Sep 2022 10:22:30 GMT Received: from hu-sgudaval-hyd.qualcomm.com (hu-krichai-hyd.qualcomm.com [10.213.110.37]) by APBLRPPMTA01.qualcomm.com (PPS) with ESMTP id 28KAMUL2016169; Tue, 20 Sep 2022 10:22:30 +0000 Received: by hu-sgudaval-hyd.qualcomm.com (Postfix, from userid 4058933) id DDF7E1A07; Tue, 20 Sep 2022 15:52:29 +0530 (+0530) From: Krishna chaitanya chundru To: helgaas@kernel.org Cc: linux-pci@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, mka@chromium.org, quic_vbadigan@quicinc.com, quic_hemantk@quicinc.com, quic_nitegupt@quicinc.com, quic_skananth@quicinc.com, quic_ramkri@quicinc.com, manivannan.sadhasivam@linaro.org, swboyd@chromium.org, dmitry.baryshkov@linaro.org, svarbanov@mm-sol.com, agross@kernel.org, andersson@kernel.org, konrad.dybcio@somainline.org, lpieralisi@kernel.org, robh@kernel.org, kw@linux.com, bhelgaas@google.com, linux-phy@lists.infradead.org, vkoul@kernel.org, kishon@ti.com, mturquette@baylibre.com, linux-clk@vger.kernel.org, Krishna chaitanya chundru , Bjorn Andersson Subject: [PATCH v7 4/5] phy: qcom: Add power suspend & resume callbacks to PCIe phy Date: Tue, 20 Sep 2022 15:52:26 +0530 Message-Id: <1663669347-29308-5-git-send-email-quic_krichai@quicinc.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1663669347-29308-1-git-send-email-quic_krichai@quicinc.com> References: <1663669347-29308-1-git-send-email-quic_krichai@quicinc.com> X-QCInternal: smtphost X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-ORIG-GUID: Sjn5LIsd3PAAGUkv95Ma8gS-WHXmhmjc X-Proofpoint-GUID: Sjn5LIsd3PAAGUkv95Ma8gS-WHXmhmjc X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.895,Hydra:6.0.528,FMLib:17.11.122.1 definitions=2022-09-20_02,2022-09-16_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 mlxlogscore=693 malwarescore=0 suspectscore=0 spamscore=0 lowpriorityscore=0 clxscore=1015 impostorscore=0 mlxscore=0 bulkscore=0 priorityscore=1501 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2209130000 definitions=main-2209200062 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Add phy power suspend & resume callbacks to PCIe phy. Using these callbacks we can release phy resources like phy specific clocks but continue maintain PCIe link in l1ss state. This can help in parking PCIe link in l1ss state during system suspend (S3). Instead of this if we add suspend & resume pm ops, phy will suspend first instead of PCIe driver, it will cause link down as phy will be down before controller goes down. Signed-off-by: Krishna chaitanya chundru --- changes since v6: - Change names from phy_power_down and phy_power_up to phy_pm_suspend and phy_pm_resume respectively. --- drivers/pci/controller/dwc/pcie-qcom.c | 4 +-- drivers/phy/qualcomm/phy-qcom-qmp-pcie.c | 50 ++++++++++++++++++++++++++++++++ 2 files changed, 52 insertions(+), 2 deletions(-) diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c index 7a6f69e..672a9be 100644 --- a/drivers/pci/controller/dwc/pcie-qcom.c +++ b/drivers/pci/controller/dwc/pcie-qcom.c @@ -1326,7 +1326,7 @@ static int qcom_pcie_resume_2_7_0(struct qcom_pcie *pcie) ret = clk_bulk_prepare_enable(res->num_clks, res->clks); - phy_power_on(pcie->phy); + phy_pm_resume(pcie->phy); return ret; } @@ -1335,7 +1335,7 @@ static int qcom_pcie_suspend_2_7_0(struct qcom_pcie *pcie) { struct qcom_pcie_resources_2_7_0 *res = &pcie->res.v2_7_0; - phy_power_off(pcie->phy); + phy_pm_suspend(pcie->phy); clk_bulk_disable_unprepare(res->num_clks, res->clks); return 0; diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c b/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c index 2d65e1f..69220dd 100644 --- a/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c +++ b/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c @@ -2145,6 +2145,54 @@ static int qcom_qmp_phy_pcie_exit(struct phy *phy) return 0; } +static int qcom_qmp_phy_pcie_resume(struct phy *phy) +{ + struct qmp_phy *qphy = phy_get_drvdata(phy); + struct qcom_qmp *qmp = qphy->qmp; + const struct qmp_phy_cfg *cfg = qphy->cfg; + int ret; + + ret = clk_bulk_prepare_enable(cfg->num_clks, qmp->clks); + if (ret) + return ret; + + ret = clk_prepare_enable(qphy->pipe_clk); + if (ret) + return ret; + + /* Pull out PHY from POWER DOWN state */ + if (cfg->regs[QPHY_PCS_POWER_DOWN_CONTROL]) { + qphy_setbits(qphy->pcs, cfg->regs[QPHY_PCS_POWER_DOWN_CONTROL], + cfg->pwrdn_ctrl); + } else { + qphy_setbits(qphy->pcs, QPHY_V2_PCS_POWER_DOWN_CONTROL, + cfg->pwrdn_ctrl); + } + + return 0; +} + +static int qcom_qmp_phy_pcie_suspend(struct phy *phy) +{ + struct qmp_phy *qphy = phy_get_drvdata(phy); + struct qcom_qmp *qmp = qphy->qmp; + const struct qmp_phy_cfg *cfg = qphy->cfg; + + clk_disable_unprepare(qphy->pipe_clk); + clk_bulk_disable_unprepare(cfg->num_clks, qmp->clks); + + /* Put PHY into POWER DOWN state: active low */ + if (cfg->regs[QPHY_PCS_POWER_DOWN_CONTROL]) { + qphy_clrbits(qphy->pcs, cfg->regs[QPHY_PCS_POWER_DOWN_CONTROL], + cfg->pwrdn_ctrl); + } else { + qphy_clrbits(qphy->pcs, QPHY_V2_PCS_POWER_DOWN_CONTROL, + cfg->pwrdn_ctrl); + } + + return 0; +} + static int qcom_qmp_phy_pcie_enable(struct phy *phy) { int ret; @@ -2304,6 +2352,8 @@ static const struct phy_ops qcom_qmp_phy_pcie_ops = { .power_on = qcom_qmp_phy_pcie_enable, .power_off = qcom_qmp_phy_pcie_disable, .set_mode = qcom_qmp_phy_pcie_set_mode, + .suspend = qcom_qmp_phy_pcie_suspend, + .resume = qcom_qmp_phy_pcie_resume, .owner = THIS_MODULE, };