Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752010AbeAPLCD (ORCPT + 1 other); Tue, 16 Jan 2018 06:02:03 -0500 Received: from smtp.codeaurora.org ([198.145.29.96]:46482 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751791AbeAPK6E (ORCPT ); Tue, 16 Jan 2018 05:58:04 -0500 DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 89A7B601D4 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: linux-arm-msm@vger.kernel.org, linux-usb@vger.kernel.org, Manu Gautam , Vivek Gautam , Varadarajan Narayanan , smuthayy , Fengguang Wu , Wei Yongjun , linux-kernel@vger.kernel.org (open list:GENERIC PHY FRAMEWORK) Subject: [PATCH v5 05/17] phy: qcom-qmp: Fix PHY block reset sequence Date: Tue, 16 Jan 2018 16:27:00 +0530 Message-Id: <1516100232-18623-6-git-send-email-mgautam@codeaurora.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1516100232-18623-1-git-send-email-mgautam@codeaurora.org> References: <1516100232-18623-1-git-send-email-mgautam@codeaurora.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Return-Path: PHY block or asynchronous reset requires signal to be asserted before de-asserting. Driver is only de-asserting signal which is already low, hence reset operation is a no-op. Fix this by asserting signal first. Also, resetting requires PHY clocks to be turned ON only after reset is finished. Fix that as well. Signed-off-by: Manu Gautam Reviewed-by: Vivek Gautam --- drivers/phy/qualcomm/phy-qcom-qmp.c | 28 +++++++++++++++++++--------- 1 file changed, 19 insertions(+), 9 deletions(-) diff --git a/drivers/phy/qualcomm/phy-qcom-qmp.c b/drivers/phy/qualcomm/phy-qcom-qmp.c index 1b82cea..ecff261 100644 --- a/drivers/phy/qualcomm/phy-qcom-qmp.c +++ b/drivers/phy/qualcomm/phy-qcom-qmp.c @@ -752,13 +752,16 @@ static int qcom_qmp_phy_com_init(struct qcom_qmp *qmp) goto err_reg_enable; } - ret = clk_bulk_prepare_enable(cfg->num_clks, qmp->clks); - if (ret) { - dev_err(qmp->dev, "failed to enable clks, err=%d\n", ret); - goto err_clk_enable; + for (i = 0; i < cfg->num_resets; i++) { + ret = reset_control_assert(qmp->resets[i]); + if (ret) { + dev_err(qmp->dev, "%s reset assert failed\n", + cfg->reset_list[i]); + goto err_rst_assert; + } } - for (i = 0; i < cfg->num_resets; i++) { + for (i = cfg->num_resets - 1; i >= 0; i--) { ret = reset_control_deassert(qmp->resets[i]); if (ret) { dev_err(qmp->dev, "%s reset deassert failed\n", @@ -767,6 +770,12 @@ static int qcom_qmp_phy_com_init(struct qcom_qmp *qmp) } } + ret = clk_bulk_prepare_enable(cfg->num_clks, qmp->clks); + if (ret) { + dev_err(qmp->dev, "failed to enable clks, err=%d\n", ret); + goto err_rst; + } + if (cfg->has_phy_com_ctrl) qphy_setbits(serdes, cfg->regs[QPHY_COM_POWER_DOWN_CONTROL], SW_PWRDN); @@ -791,7 +800,7 @@ static int qcom_qmp_phy_com_init(struct qcom_qmp *qmp) if (ret) { dev_err(qmp->dev, "phy common block init timed-out\n"); - goto err_rst; + goto err_com_init; } } @@ -799,11 +808,12 @@ static int qcom_qmp_phy_com_init(struct qcom_qmp *qmp) return 0; +err_com_init: + clk_bulk_disable_unprepare(cfg->num_clks, qmp->clks); err_rst: - while (--i >= 0) + while (++i < cfg->num_resets) reset_control_assert(qmp->resets[i]); - clk_bulk_disable_unprepare(cfg->num_clks, qmp->clks); -err_clk_enable: +err_rst_assert: regulator_bulk_disable(cfg->num_vregs, qmp->vregs); err_reg_enable: mutex_unlock(&qmp->phy_mutex); -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project