From patchwork Tue Aug 27 05:55:48 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Siddharth Vadapalli X-Patchwork-Id: 13778879 Received: from lelv0142.ext.ti.com (lelv0142.ext.ti.com [198.47.23.249]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 292E645028; Tue, 27 Aug 2024 05:56:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.47.23.249 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724738175; cv=none; b=J2YM6NJqvcXajbEcGpT0/fHjnJDWDHHaw+ebepkcXAJXpnWSLr75KTVOtPthrpejzL6iEfDla20hOV+5hugfRepXfb4Af0iIB1GTDa8RFpKsSO4o8tZxhnEPBAW+kR+bR+2SjWAhHmkAEkz3L5ZQBhSeKXOLIq1ItjPSBe8LbC4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724738175; c=relaxed/simple; bh=o4PUkT1ndfyiYg9yUNMhnRNcUI0/Err8UUsboDfP/c8=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=f7i/sJp3EAOkUAui2ekXJ1RMfZeSMAHO9AZvSwA9Ihn8UoxO2rPoseBKpnWQREFoDZcOuFuPGg/RYamFHRQveR2nN/4x68X27RjR5PDYWIGnnB4P2fvzjGOR+C+YSB72f5ws1PA5JiJmCVxMzACAguSQz+e8rX+64Nxyj0I5kf0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=ti.com; spf=pass smtp.mailfrom=ti.com; dkim=pass (1024-bit key) header.d=ti.com header.i=@ti.com header.b=el/kp47H; arc=none smtp.client-ip=198.47.23.249 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=ti.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=ti.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=ti.com header.i=@ti.com header.b="el/kp47H" Received: from fllv0034.itg.ti.com ([10.64.40.246]) by lelv0142.ext.ti.com (8.15.2/8.15.2) with ESMTP id 47R5u4rn116401; Tue, 27 Aug 2024 00:56:04 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1724738164; bh=iCNZUhycfyj1kY3kt5uCHhGpAcrMxjqleOLxhg4VqI8=; h=From:To:CC:Subject:Date:In-Reply-To:References; b=el/kp47H5X5wCO0MolnMuiy8U2xqIaqKq+kgreQOnGv6SGeowWeSRMe2jiV2uk1fJ 7OfyyPmNu8rnTdnNqMDXvL70B+9PwBwmiJk6gvlzJ+zMQ7O8AX7jBpb9oqywRxeTYl 1BZ2brOolUF3HoaxC3PFD06DnfjcXB7dGNIGJBdg= Received: from DLEE113.ent.ti.com (dlee113.ent.ti.com [157.170.170.24]) by fllv0034.itg.ti.com (8.15.2/8.15.2) with ESMTPS id 47R5u4gl094810 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Tue, 27 Aug 2024 00:56:04 -0500 Received: from DLEE100.ent.ti.com (157.170.170.30) by DLEE113.ent.ti.com (157.170.170.24) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2507.23; Tue, 27 Aug 2024 00:56:04 -0500 Received: from lelvsmtp5.itg.ti.com (10.180.75.250) by DLEE100.ent.ti.com (157.170.170.30) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2507.23 via Frontend Transport; Tue, 27 Aug 2024 00:56:04 -0500 Received: from uda0492258.dhcp.ti.com (uda0492258.dhcp.ti.com [10.24.72.81]) by lelvsmtp5.itg.ti.com (8.15.2/8.15.2) with ESMTP id 47R5tn7f103422; Tue, 27 Aug 2024 00:55:59 -0500 From: Siddharth Vadapalli To: , , , , , , , , CC: , , , , , Subject: [PATCH v3 2/2] PCI: j721e: Enable ACSPCIE Refclk if "ti,syscon-acspcie-proxy-ctrl" exists Date: Tue, 27 Aug 2024 11:25:48 +0530 Message-ID: <20240827055548.901285-3-s-vadapalli@ti.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20240827055548.901285-1-s-vadapalli@ti.com> References: <20240827055548.901285-1-s-vadapalli@ti.com> Precedence: bulk X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 The ACSPCIE module is capable of driving the reference clock required by the PCIe Endpoint device. It is an alternative to on-board and external reference clock generators. Enabling the output from the ACSPCIE module's PAD IO Buffers requires clearing the "PAD IO disable" bits of the ACSPCIE_PROXY_CTRL register in the CTRL_MMR register space. Add support to enable the ACSPCIE reference clock output using the optional device-tree property "ti,syscon-acspcie-proxy-ctrl". Signed-off-by: Siddharth Vadapalli --- v2: https://lore.kernel.org/r/20240729092855.1945700-3-s-vadapalli@ti.com/ Changes since v2: - Rebased patch on next-20240826. v1: https://lore.kernel.org/r/20240715120936.1150314-4-s-vadapalli@ti.com/ Changes since v1: - Addressed Bjorn's feedback at: https://lore.kernel.org/r/20240725211841.GA859405@bhelgaas/ with the following changes: 1) Updated $subject and commit message to indicate that this patch enables ACSPCIE reference clock output if the DT property is present. 2) Updated macro and comments to indicate that the BITS correspond to disabling ACSPCIE output, due to which clearing them enables the reference clock output. 3) Replaced "PAD" with "refclk" both in the function name and in the error prints. 4) Wrapped lines to be within the 80 character limit to match the rest of the driver. drivers/pci/controller/cadence/pci-j721e.c | 38 ++++++++++++++++++++++ 1 file changed, 38 insertions(+) diff --git a/drivers/pci/controller/cadence/pci-j721e.c b/drivers/pci/controller/cadence/pci-j721e.c index 85718246016b..ed42b2229483 100644 --- a/drivers/pci/controller/cadence/pci-j721e.c +++ b/drivers/pci/controller/cadence/pci-j721e.c @@ -44,6 +44,7 @@ enum link_status { #define J721E_MODE_RC BIT(7) #define LANE_COUNT(n) ((n) << 8) +#define ACSPCIE_PAD_DISABLE_MASK GENMASK(1, 0) #define GENERATION_SEL_MASK GENMASK(1, 0) struct j721e_pcie { @@ -220,6 +221,34 @@ static int j721e_pcie_set_lane_count(struct j721e_pcie *pcie, return ret; } +static int j721e_enable_acspcie_refclk(struct j721e_pcie *pcie, + struct regmap *syscon) +{ + struct device *dev = pcie->cdns_pcie->dev; + struct device_node *node = dev->of_node; + u32 mask = ACSPCIE_PAD_DISABLE_MASK; + struct of_phandle_args args; + u32 val; + int ret; + + ret = of_parse_phandle_with_fixed_args(node, + "ti,syscon-acspcie-proxy-ctrl", + 1, 0, &args); + if (!ret) { + /* Clear PAD IO disable bits to enable refclk output */ + val = ~(args.args[0]); + ret = regmap_update_bits(syscon, 0, mask, val); + if (ret) + dev_err(dev, "failed to enable ACSPCIE refclk: %d\n", + ret); + } else { + dev_err(dev, + "ti,syscon-acspcie-proxy-ctrl has invalid arguments\n"); + } + + return ret; +} + static int j721e_pcie_ctrl_init(struct j721e_pcie *pcie) { struct device *dev = pcie->cdns_pcie->dev; @@ -259,6 +288,15 @@ static int j721e_pcie_ctrl_init(struct j721e_pcie *pcie) return ret; } + /* Enable ACSPCIE refclk output if the optional property exists */ + syscon = syscon_regmap_lookup_by_phandle_optional(node, + "ti,syscon-acspcie-proxy-ctrl"); + if (syscon) { + ret = j721e_enable_acspcie_refclk(pcie, syscon); + if (ret) + return ret; + } + return 0; }