From patchwork Wed Jun 29 09:17:51 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jon Hunter X-Patchwork-Id: 9204567 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 A993960757 for ; Wed, 29 Jun 2016 09:19:13 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 9805028636 for ; Wed, 29 Jun 2016 09:19:13 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 8CC5E28644; Wed, 29 Jun 2016 09:19:13 +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=-4.2 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 4617C28636 for ; Wed, 29 Jun 2016 09:19:13 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 7A5066E6A1; Wed, 29 Jun 2016 09:19:01 +0000 (UTC) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from hqemgate15.nvidia.com (hqemgate15.nvidia.com [216.228.121.64]) by gabe.freedesktop.org (Postfix) with ESMTPS id 6334F6E698 for ; Wed, 29 Jun 2016 09:18:19 +0000 (UTC) Received: from hqnvupgp08.nvidia.com (Not Verified[216.228.121.13]) by hqemgate15.nvidia.com id ; Wed, 29 Jun 2016 02:17:44 -0700 Received: from HQMAIL108.nvidia.com ([172.20.12.94]) by hqnvupgp08.nvidia.com (PGP Universal service); Wed, 29 Jun 2016 02:17:03 -0700 X-PGP-Universal: processed; by hqnvupgp08.nvidia.com on Wed, 29 Jun 2016 02:17:03 -0700 Received: from HQMAIL101.nvidia.com (172.20.187.10) by HQMAIL108.nvidia.com (172.18.146.13) with Microsoft SMTP Server (TLS) id 15.0.1130.7; Wed, 29 Jun 2016 09:18:17 +0000 Received: from hqnvemgw01.nvidia.com (172.20.150.20) by HQMAIL101.nvidia.com (172.20.187.10) with Microsoft SMTP Server id 15.0.1130.7 via Frontend Transport; Wed, 29 Jun 2016 09:18:17 +0000 Received: from jonathanh-lm.nvidia.com (Not Verified[10.21.132.149]) by hqnvemgw01.nvidia.com with Trustwave SEG (v7, 5, 5, 8150) id ; Wed, 29 Jun 2016 02:18:16 -0700 From: Jon Hunter To: Thierry Reding , David Airlie , Stephen Warren , Alexandre Courbot , Wolfram Sang , Rob Herring , Mark Rutland Subject: [PATCH V2 05/11] drm/tegra: Prepare DPAUX for supporting generic PM domains Date: Wed, 29 Jun 2016 10:17:51 +0100 Message-ID: <1467191877-26017-6-git-send-email-jonathanh@nvidia.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1467191877-26017-1-git-send-email-jonathanh@nvidia.com> References: <1467191877-26017-1-git-send-email-jonathanh@nvidia.com> X-NVConfidentiality: public MIME-Version: 1.0 Cc: devicetree@vger.kernel.org, dri-devel@lists.freedesktop.org, Jon Hunter , linux-gpio@vger.kernel.org, linux-i2c@vger.kernel.org, linux-tegra@vger.kernel.org X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" X-Virus-Scanned: ClamAV using ClamSMTP To utilise the DPAUX on Tegra, the SOR power partition must be enabled. Now that Tegra supports the generic PM domain framework we manage the SOR power partition via this framework for DPAUX. However, the sequence for gating/ungating the SOR power partition requires that the DPAUX reset is asserted/de-asserted at the time the SOR power partition is gated/ungated, respectively. Now that the reset control core assumes that resets are exclusive, the Tegra generic PM domain code and the DPAUX driver cannot request the same reset unless we mark the resets as shared. Sharing resets we will not work in this case because we cannot guarantee that the reset is asserted/de-asserted at the appropriate time. Therefore, given that the Tegra generic PM domain code will handle the DPAUX reset, do not request the reset in the DPAUX driver if the DPAUX device has a PM domain associated. Signed-off-by: Jon Hunter --- drivers/gpu/drm/tegra/dpaux.c | 22 ++++++++++++++-------- 1 file changed, 14 insertions(+), 8 deletions(-) diff --git a/drivers/gpu/drm/tegra/dpaux.c b/drivers/gpu/drm/tegra/dpaux.c index 4014ec57ed31..61821f457209 100644 --- a/drivers/gpu/drm/tegra/dpaux.c +++ b/drivers/gpu/drm/tegra/dpaux.c @@ -339,11 +339,14 @@ static int tegra_dpaux_probe(struct platform_device *pdev) return -ENXIO; } - dpaux->rst = devm_reset_control_get(&pdev->dev, "dpaux"); - if (IS_ERR(dpaux->rst)) { - dev_err(&pdev->dev, "failed to get reset control: %ld\n", - PTR_ERR(dpaux->rst)); - return PTR_ERR(dpaux->rst); + if (!pdev->dev.pm_domain) { + dpaux->rst = devm_reset_control_get(&pdev->dev, "dpaux"); + if (IS_ERR(dpaux->rst)) { + dev_err(&pdev->dev, + "failed to get reset control: %ld\n", + PTR_ERR(dpaux->rst)); + return PTR_ERR(dpaux->rst); + } } dpaux->clk = devm_clk_get(&pdev->dev, NULL); @@ -360,7 +363,8 @@ static int tegra_dpaux_probe(struct platform_device *pdev) return err; } - reset_control_deassert(dpaux->rst); + if (dpaux->rst) + reset_control_deassert(dpaux->rst); dpaux->clk_parent = devm_clk_get(&pdev->dev, "parent"); if (IS_ERR(dpaux->clk_parent)) { @@ -438,7 +442,8 @@ static int tegra_dpaux_probe(struct platform_device *pdev) disable_parent_clk: clk_disable_unprepare(dpaux->clk_parent); assert_reset: - reset_control_assert(dpaux->rst); + if (dpaux->rst) + reset_control_assert(dpaux->rst); clk_disable_unprepare(dpaux->clk); return err; @@ -460,7 +465,8 @@ static int tegra_dpaux_remove(struct platform_device *pdev) cancel_work_sync(&dpaux->work); clk_disable_unprepare(dpaux->clk_parent); - reset_control_assert(dpaux->rst); + if (dpaux->rst) + reset_control_assert(dpaux->rst); clk_disable_unprepare(dpaux->clk); return 0;