From patchwork Mon Nov 27 12:13:51 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: 13469470 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=quicinc.com header.i=@quicinc.com header.b="Lm8MSf93" Received: from mx0b-0031df01.pphosted.com (mx0b-0031df01.pphosted.com [205.220.180.131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2FEC810CA; Mon, 27 Nov 2023 04:14:46 -0800 (PST) Received: from pps.filterd (m0279872.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 3ARBuci5022349; Mon, 27 Nov 2023 12:14:40 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; h=from : date : subject : mime-version : content-type : content-transfer-encoding : message-id : references : in-reply-to : to : cc; s=qcppdkim1; bh=Mwt/tc7oxaZVaxbhV5hYKe81nZekUp6gxT1uZJu+xF4=; b=Lm8MSf934ZNE1T3gS9kaDm8MdqdqdflC1ym9U2ttfAUjTzCkKJelpDkc0j1fwWjxvLJA VzelAuhJDeZaVHMYaefPprKy7Qf+5dttH2ez5//PmjyqGiSVcSoX+LEuysy0GUqsDl6K gRTHTFyGYyZb+c53nqCqhGXPr8Y0h3aas5uIMstJDzPv9wY+DsmXQv+3DLzgTk0ZjQby 3En75hSuR2r5z7PtDLFS/2xbhJQREYUIa+D+hjQKpKsirpCTojlDQE048KoG1+CbWyh0 80UJgSf/PoU4HSDE29MIgJn0fFxuMHPmyX1/avQE72+Cvl/GGUR2qKLkXqxK+BtRfEoN hw== Received: from nalasppmta01.qualcomm.com (Global_NAT1.qualcomm.com [129.46.96.20]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3uk9adm2un-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 27 Nov 2023 12:14:40 +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 3ARCEdAM014936 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 27 Nov 2023 12:14:39 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 15.2.1118.40; Mon, 27 Nov 2023 04:14:33 -0800 From: Krishna chaitanya chundru Date: Mon, 27 Nov 2023 17:43:51 +0530 Subject: [PATCH v3 3/3] phy: qcom-qmp-pcie: Add support for keeping refclk always on Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-ID: <20231127-refclk_always_on-v3-3-26d969fa8f1d@quicinc.com> References: <20231127-refclk_always_on-v3-0-26d969fa8f1d@quicinc.com> In-Reply-To: <20231127-refclk_always_on-v3-0-26d969fa8f1d@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" , Dmitry Baryshkov X-Mailer: b4 0.13-dev-83828 X-Developer-Signature: v=1; a=ed25519-sha256; t=1701087256; l=2385; i=quic_krichai@quicinc.com; s=20230907; h=from:subject:message-id; bh=w21FU3eA0VG4vGK0aaYA0Nrf7F5/HCavLA1e1RaBndc=; b=HCVVnv8YB0O2ZOyoGkIuHDninTGdT9FJjAmNErVSYkGZsmuBLpiW7GdMH4pg7zioo4aXFmRUl vJfZecH13gLBl6gud4nA0Cv9qODw0DVkOuLTOm8BhBJyVj5bQ01oxnl X-Developer-Key: i=quic_krichai@quicinc.com; a=ed25519; pk=10CL2pdAKFyzyOHbfSWHCD0X0my7CXxj8gJScmn1FAg= X-ClientProxiedBy: nasanex01a.na.qualcomm.com (10.52.223.231) 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-ORIG-GUID: 6a_EMSw5V3MRyOLGPyw_vUQEdbw9RpdM X-Proofpoint-GUID: 6a_EMSw5V3MRyOLGPyw_vUQEdbw9RpdM X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.987,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-11-27_09,2023-11-27_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 mlxscore=0 clxscore=1015 priorityscore=1501 malwarescore=0 lowpriorityscore=0 phishscore=0 bulkscore=0 mlxlogscore=999 adultscore=0 impostorscore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2311060000 definitions=main-2311270083 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. Some platforms with pcie switch fail to drive the clkreq signal to the host from the endpoints because of the switch board design. Due to that refclk needs to supplied to the endpoint always. Add a flag to keep refclk always supplied to endpoint. Signed-off-by: Krishna chaitanya chundru Reviewed-by: Dmitry Baryshkov --- drivers/phy/qualcomm/phy-qcom-qmp-pcie.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c b/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c index 7fdf9b2596b6..e95f677817f7 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 @@ -2264,6 +2266,8 @@ struct qmp_pcie { struct phy *phy; int mode; + bool refclk_always_on; + struct clk_fixed_rate pipe_clk_fixed; }; @@ -3179,6 +3183,10 @@ 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); @@ -3701,6 +3709,12 @@ 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"); + if (qmp->refclk_always_on && !qmp->cfg->regs[QPHY_PCS_ENDPOINT_REFCLK_CNTRL]) { + dev_err(dev, "refclk is always on is present but refclk cntrl offset is not present\n"); + goto err_node_put; + } + ret = phy_pipe_clk_register(qmp, np); if (ret) goto err_node_put;