Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752930AbdI0JB7 (ORCPT ); Wed, 27 Sep 2017 05:01:59 -0400 Received: from smtp.codeaurora.org ([198.145.29.96]:51946 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752717AbdI0JBz (ORCPT ); Wed, 27 Sep 2017 05:01:55 -0400 DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org D1BDA60CA2 Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=none smtp.mailfrom=mgautam@codeaurora.org From: Manu Gautam To: Kishon Vijay Abraham I Cc: Felipe Balbi , linux-arm-msm@vger.kernel.org, linux-usb@vger.kernel.org, Manu Gautam , Vivek Gautam , Varadarajan Narayanan , Jaehoon Chung , Fengguang Wu , Wei Yongjun , linux-kernel@vger.kernel.org (open list:GENERIC PHY FRAMEWORK) Subject: [PATCH v2 17/17] phy: qcom-qmp: Add support for runtime PM Date: Wed, 27 Sep 2017 14:29:13 +0530 Message-Id: <1506502753-27408-18-git-send-email-mgautam@codeaurora.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1506502753-27408-1-git-send-email-mgautam@codeaurora.org> References: <1506502753-27408-1-git-send-email-mgautam@codeaurora.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 10383 Lines: 334 Disable clocks as part of PHY suspend. This also requires enabling PHY autonomous mode to detect lfps/rx_det in suspend state. Signed-off-by: Manu Gautam --- drivers/phy/qualcomm/phy-qcom-qmp.c | 182 +++++++++++++++++++++++++++++++++++- drivers/phy/qualcomm/phy-qcom-qmp.h | 3 + 2 files changed, 184 insertions(+), 1 deletion(-) diff --git a/drivers/phy/qualcomm/phy-qcom-qmp.c b/drivers/phy/qualcomm/phy-qcom-qmp.c index 1403de3..a04ba28 100644 --- a/drivers/phy/qualcomm/phy-qcom-qmp.c +++ b/drivers/phy/qualcomm/phy-qcom-qmp.c @@ -61,6 +61,20 @@ #define USB3_MODE BIT(0) /* enables USB3 mode */ #define DP_MODE BIT(1) /* enables DP mode */ +/* QPHY_PCS_AUTONOMOUS_MODE_CTRL register bits */ +#define ARCVR_DTCT_EN BIT(0) +#define ALFPS_DTCT_EN BIT(1) +#define ARCVR_DTCT_EVENT_SEL BIT(4) + +/* QPHY_PCS_LFPS_RXTERM_IRQ_CLEAR register bits */ +#define IRQ_CLEAR BIT(0) + +/* QPHY_PCS_LFPS_RXTERM_IRQ_STATUS register bits */ +#define RCVR_DETECT BIT(0) + +/* QPHY_V3_PCS_MISC_CLAMP_ENABLE register bits */ +#define CLAMP_EN BIT(0) /* enables i/o clamp_n */ + /* QSCRATCH register bits */ #define QSCRATCH_SS_PHY_CTRL 0x30 #define LANE0_PWR_PRESENT BIT(24) @@ -111,6 +125,9 @@ enum qphy_reg_layout { QPHY_SW_RESET, QPHY_START_CTRL, QPHY_PCS_READY_STATUS, + QPHY_PCS_AUTONOMOUS_MODE_CTRL, + QPHY_PCS_LFPS_RXTERM_IRQ_CLEAR, + QPHY_PCS_LFPS_RXTERM_IRQ_STATUS, }; static const unsigned int pciephy_regs_layout[] = { @@ -138,12 +155,18 @@ enum qphy_reg_layout { [QPHY_SW_RESET] = 0x00, [QPHY_START_CTRL] = 0x08, [QPHY_PCS_READY_STATUS] = 0x17c, + [QPHY_PCS_AUTONOMOUS_MODE_CTRL] = 0x0d4, + [QPHY_PCS_LFPS_RXTERM_IRQ_CLEAR] = 0x0d8, + [QPHY_PCS_LFPS_RXTERM_IRQ_STATUS] = 0x178, }; static const unsigned int qmp_v3_usb3phy_regs_layout[] = { [QPHY_SW_RESET] = 0x00, [QPHY_START_CTRL] = 0x08, [QPHY_PCS_READY_STATUS] = 0x174, + [QPHY_PCS_AUTONOMOUS_MODE_CTRL] = 0x0d8, + [QPHY_PCS_LFPS_RXTERM_IRQ_CLEAR] = 0x0dc, + [QPHY_PCS_LFPS_RXTERM_IRQ_STATUS] = 0x170, }; static const struct qmp_phy_init_tbl msm8996_pcie_serdes_tbl[] = { @@ -539,6 +562,7 @@ struct qmp_phy_cfg { * @tx: iomapped memory space for lane's tx * @rx: iomapped memory space for lane's rx * @pcs: iomapped memory space for lane's pcs + * @pcs_misc: iomapped memory space for lane's pcs_misc * @pipe_clk: pipe lock * @index: lane index * @qmp: QMP phy to which this lane belongs @@ -549,6 +573,7 @@ struct qmp_phy { void __iomem *tx; void __iomem *rx; void __iomem *pcs; + void __iomem *pcs_misc; struct clk *pipe_clk; unsigned int index; struct qcom_qmp *qmp; @@ -587,6 +612,7 @@ struct qcom_qmp { struct mutex phy_mutex; int init_count; + bool phy_initialized; enum phy_mode mode; }; @@ -784,6 +810,7 @@ static int qcom_qmp_phy_com_init(struct qcom_qmp *qmp) { const struct qmp_phy_cfg *cfg = qmp->cfg; void __iomem *serdes = qmp->serdes; + void __iomem *dp_com = qmp->dp_com; int ret, i; mutex_lock(&qmp->phy_mutex); @@ -993,6 +1020,7 @@ static int qcom_qmp_phy_init(struct phy *phy) dev_err(qmp->dev, "pipe_clk enable failed, err=%d\n", ret); goto err_pcs_ready; } + qmp->phy_initialized = true; return 0; @@ -1027,6 +1055,135 @@ static int qcom_qmp_phy_exit(struct phy *phy) qcom_qmp_phy_com_exit(qmp); + qmp->phy_initialized = false; + + return 0; +} + +static void qcom_qmp_phy_enable_autonomous_mode(struct qmp_phy *qphy) +{ + struct qcom_qmp *qmp = qphy->qmp; + const struct qmp_phy_cfg *cfg = qmp->cfg; + void __iomem *pcs = qphy->pcs; + void __iomem *pcs_misc = qphy->pcs_misc; + unsigned int reg; + + /* Clear previous PHY int_status before checking rx_det */ + qphy_setbits(pcs, cfg->regs[QPHY_PCS_LFPS_RXTERM_IRQ_CLEAR], IRQ_CLEAR); + /* Writing 1 followed by 0 clears the interrupt */ + qphy_clrbits(pcs, cfg->regs[QPHY_PCS_LFPS_RXTERM_IRQ_CLEAR], IRQ_CLEAR); + + /* Enable PHY autonomous mode to detect lfps and rx_det detach */ + qphy_setbits(pcs, cfg->regs[QPHY_PCS_AUTONOMOUS_MODE_CTRL], + ARCVR_DTCT_EN | ALFPS_DTCT_EN); + + /* Enable i/o clamp_n for autonomous mode */ + if (pcs_misc) + qphy_clrbits(pcs_misc, QPHY_V3_PCS_MISC_CLAMP_ENABLE, CLAMP_EN); + + /* Add delay for int_status to reflect current rx_det state */ + usleep_range(10000, 12000); + reg = readl(pcs + cfg->regs[QPHY_PCS_LFPS_RXTERM_IRQ_STATUS]); + + /* + * Get rx_det state to know if SS device not connected. If so + * then enable RX_DET attach interrupt. + */ + if (reg & RCVR_DETECT) { + dev_dbg(qmp->dev, "Enable rx_det attach interrupt\n"); + qphy_clrbits(pcs, cfg->regs[QPHY_PCS_AUTONOMOUS_MODE_CTRL], + ARCVR_DTCT_EN | ALFPS_DTCT_EN); + + /* Clear previous PHY interrupt status before re-enabling */ + qphy_setbits(pcs, cfg->regs[QPHY_PCS_LFPS_RXTERM_IRQ_CLEAR], + IRQ_CLEAR); + /* Writing 1 followed by 0 clears the interrupt */ + qphy_clrbits(pcs, cfg->regs[QPHY_PCS_LFPS_RXTERM_IRQ_CLEAR], + IRQ_CLEAR); + + /* Enable rx_det attach interrupt */ + qphy_setbits(pcs, cfg->regs[QPHY_PCS_AUTONOMOUS_MODE_CTRL], + ARCVR_DTCT_EN | ARCVR_DTCT_EVENT_SEL); + } +} + +static void qcom_qmp_phy_disable_autonomous_mode(struct qmp_phy *qphy) +{ + struct qcom_qmp *qmp = qphy->qmp; + const struct qmp_phy_cfg *cfg = qmp->cfg; + void __iomem *pcs = qphy->pcs; + void __iomem *pcs_misc = qphy->pcs_misc; + + /* Disable i/o clamp_n on resume for normal mode */ + if (pcs_misc) + qphy_setbits(pcs_misc, QPHY_V3_PCS_MISC_CLAMP_ENABLE, CLAMP_EN); + + qphy_clrbits(pcs, cfg->regs[QPHY_PCS_AUTONOMOUS_MODE_CTRL], + ARCVR_DTCT_EN | ARCVR_DTCT_EVENT_SEL | ALFPS_DTCT_EN); + + qphy_setbits(pcs, cfg->regs[QPHY_PCS_LFPS_RXTERM_IRQ_CLEAR], IRQ_CLEAR); + /* Writing 1 followed by 0 clears the interrupt */ + qphy_clrbits(pcs, cfg->regs[QPHY_PCS_LFPS_RXTERM_IRQ_CLEAR], IRQ_CLEAR); +} + +static int __maybe_unused qcom_qmp_phy_runtime_suspend(struct device *dev) +{ + struct qcom_qmp *qmp = dev_get_drvdata(dev); + struct qmp_phy *qphy = qmp->phys[0]; + const struct qmp_phy_cfg *cfg = qmp->cfg; + + dev_vdbg(dev, "Suspending QMP phy, mode:%d\n", qmp->mode); + + /* Supported only for USB3 PHY */ + if (cfg->type != PHY_TYPE_USB3) + return 0; + + if (!qmp->phy_initialized) { + dev_vdbg(dev, "PHY not initialized, bailing out\n"); + return 0; + } + + qcom_qmp_phy_enable_autonomous_mode(qphy); + + clk_disable_unprepare(qphy->pipe_clk); + clk_bulk_disable_unprepare(cfg->num_clks, qmp->clks); + + return 0; +} + +static int __maybe_unused qcom_qmp_phy_runtime_resume(struct device *dev) +{ + struct qcom_qmp *qmp = dev_get_drvdata(dev); + struct qmp_phy *qphy = qmp->phys[0]; + const struct qmp_phy_cfg *cfg = qmp->cfg; + int ret = 0; + + dev_vdbg(dev, "Resuming QMP phy, mode:%d\n", qmp->mode); + + /* Supported only for USB3 PHY */ + if (cfg->type != PHY_TYPE_USB3) + return 0; + + if (!qmp->phy_initialized) { + dev_vdbg(dev, "PHY not initialized, bailing out\n"); + return 0; + } + + ret = clk_bulk_prepare_enable(cfg->num_clks, qmp->clks); + if (ret) { + dev_err(qmp->dev, "failed to enable clks, err=%d\n", ret); + return ret; + } + + ret = clk_prepare_enable(qphy->pipe_clk); + if (ret) { + dev_err(dev, "pipe_clk enable failed, err=%d\n", ret); + clk_bulk_disable_unprepare(cfg->num_clks, qmp->clks); + return ret; + } + + qcom_qmp_phy_disable_autonomous_mode(qphy); + return 0; } @@ -1178,7 +1335,8 @@ int qcom_qmp_phy_create(struct device *dev, struct device_node *np, int id) /* * Get memory resources for each phy lane: - * Resources are indexed as: tx -> 0; rx -> 1; pcs -> 2. + * Resources are indexed as: tx -> 0; rx -> 1; pcs -> 2; and + * pcs_misc (optional) -> 3. */ qphy->tx = of_iomap(np, 0); if (!qphy->tx) @@ -1192,6 +1350,10 @@ int qcom_qmp_phy_create(struct device *dev, struct device_node *np, int id) if (!qphy->pcs) return -ENOMEM; + qphy->pcs_misc = of_iomap(np, 3); + if (!qphy->pcs_misc) + dev_vdbg(dev, "PHY pcs_misc-reg not used\n"); + /* * Get PHY's Pipe clock, if any. USB3 and PCIe are PIPE3 * based phys, so they essentially have pipe clock. So, @@ -1258,6 +1420,11 @@ int qcom_qmp_phy_create(struct device *dev, struct device_node *np, int id) }; MODULE_DEVICE_TABLE(of, qcom_qmp_phy_of_match_table); +static const struct dev_pm_ops qcom_qmp_phy_pm_ops = { + SET_RUNTIME_PM_OPS(qcom_qmp_phy_runtime_suspend, + qcom_qmp_phy_runtime_resume, NULL) +}; + static int qcom_qmp_phy_probe(struct platform_device *pdev) { struct qcom_qmp *qmp; @@ -1337,12 +1504,21 @@ static int qcom_qmp_phy_probe(struct platform_device *pdev) return -ENOMEM; id = 0; + pm_runtime_set_active(dev); + pm_runtime_enable(dev); + /* + * Prevent runtime pm from being ON by default. Users can enable + * it using power/control in sysfs. + */ + pm_runtime_forbid(dev); + for_each_available_child_of_node(dev->of_node, child) { /* Create per-lane phy */ ret = qcom_qmp_phy_create(dev, child, id); if (ret) { dev_err(dev, "failed to create lane%d phy, %d\n", id, ret); + pm_runtime_disable(dev); return ret; } @@ -1354,6 +1530,7 @@ static int qcom_qmp_phy_probe(struct platform_device *pdev) if (ret) { dev_err(qmp->dev, "failed to register pipe clock source\n"); + pm_runtime_disable(dev); return ret; } id++; @@ -1362,6 +1539,8 @@ static int qcom_qmp_phy_probe(struct platform_device *pdev) phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate); if (!IS_ERR(phy_provider)) dev_info(dev, "Registered Qcom-QMP phy\n"); + else + pm_runtime_disable(dev); return PTR_ERR_OR_ZERO(phy_provider); } @@ -1370,6 +1549,7 @@ static int qcom_qmp_phy_probe(struct platform_device *pdev) .probe = qcom_qmp_phy_probe, .driver = { .name = "qcom-qmp-phy", + .pm = &qcom_qmp_phy_pm_ops, .of_match_table = qcom_qmp_phy_of_match_table, }, }; diff --git a/drivers/phy/qualcomm/phy-qcom-qmp.h b/drivers/phy/qualcomm/phy-qcom-qmp.h index f7d4c2a..264b5c4 100644 --- a/drivers/phy/qualcomm/phy-qcom-qmp.h +++ b/drivers/phy/qualcomm/phy-qcom-qmp.h @@ -283,4 +283,7 @@ #define QPHY_V3_PCS_FLL_MAN_CODE 0x0d4 #define QPHY_V3_PCS_RX_SIGDET_LVL 0x1d8 +/* Only for QMP V3 PHY - PCS_MISC registers */ +#define QPHY_V3_PCS_MISC_CLAMP_ENABLE 0x0c + #endif -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project