From patchwork Wed Sep 27 08:59:01 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Manu Gautam X-Patchwork-Id: 9973525 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 4621560365 for ; Wed, 27 Sep 2017 09:08:32 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 3DE16290EB for ; Wed, 27 Sep 2017 09:08:32 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 30ED629103; Wed, 27 Sep 2017 09:08:32 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=2.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_HI,T_DKIM_INVALID autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id A596C290EB for ; Wed, 27 Sep 2017 09:08:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752533AbdI0JAX (ORCPT ); Wed, 27 Sep 2017 05:00:23 -0400 Received: from smtp.codeaurora.org ([198.145.29.96]:50330 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752339AbdI0JAT (ORCPT ); Wed, 27 Sep 2017 05:00:19 -0400 Received: by smtp.codeaurora.org (Postfix, from userid 1000) id 2332960B71; Wed, 27 Sep 2017 09:00:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1506502818; bh=Lmb/BVP7YaoMq59+k/GyZcE6PvX/oG3lHnwIDiksvYE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=iKWpvc9VCemCgZw+Yjz2F2z0+E0IMZsKqQf9mY/fG3AbdvqVa/6gfMcKG5kza8oyP NYMxb+223baHefscK+IQ9ms5lUsRtpVJNvbIH2RuiaCVQEQh4bdacY8yVQ+DQC59qQ P/lG9COjLFRxNucSNxGA+vau2agZdn2Osap0JWX4= Received: from mgautam-linux.qualcomm.com (blr-c-bdr-fw-01_globalnat_allzones-outside.qualcomm.com [103.229.19.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: mgautam@smtp.codeaurora.org) by smtp.codeaurora.org (Postfix) with ESMTPSA id 43ACD60B62; Wed, 27 Sep 2017 09:00:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1506502816; bh=Lmb/BVP7YaoMq59+k/GyZcE6PvX/oG3lHnwIDiksvYE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=DCS9ZEHPuI92PY3yb+wnXRMKY5EahGq3EQX0pbG1PBFNNsTzhwTF0z0cASgl8hYln AHueIxWGwh6LYav0e2cwH375prs3xwgdC3IjgBFWHOup/L6xkw+IipEJOmpVHPNomr 9ciHLBQVZm/Ply7oPb8CU0/JMGrr8Roup0zOohFo= DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 43ACD60B62 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 , Heiko Stuebner , Wei Yongjun , Fengguang Wu , linux-kernel@vger.kernel.org (open list:GENERIC PHY FRAMEWORK) Subject: [PATCH v2 05/17] phy: qcom-qmp: Fix PHY block reset sequence Date: Wed, 27 Sep 2017 14:29:01 +0530 Message-Id: <1506502753-27408-6-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-arm-msm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP 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 --- 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 2f427e3..aa27757 100644 --- a/drivers/phy/qualcomm/phy-qcom-qmp.c +++ b/drivers/phy/qualcomm/phy-qcom-qmp.c @@ -739,13 +739,16 @@ static int qcom_qmp_phy_com_init(struct qcom_qmp *qmp) return ret; } - 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", @@ -754,6 +757,12 @@ 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); @@ -778,7 +787,7 @@ 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; } } @@ -786,11 +795,12 @@ 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); mutex_unlock(&qmp->phy_mutex);