From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 67EFC2D6E70; Mon, 27 Oct 2025 19:08:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761592128; cv=none; b=NovoUF5c9N6F8HM1CW5IaX0Mf4PPqNzdZxMuw18BzE/bkQYBmifxx1AKJw/nK0qJb/wJqvmOQMkiZAiQRUodGCiAbyqrBVp6mKiHhMTe5dHjd2gZNLl5mO9Yq3WLvZ1XvkHKHhOg3BhBbW1zOqqIrg8pNZ6r6TvyJMLKtviZgQ4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761592128; c=relaxed/simple; bh=1TsHgw3UBX/dEKgE+fRb+VdrVraqadrdYwstlUJ//ss=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=JikScMkWG9rGYXZqs3IYsF72VxQMDuwC2YtU5aqGHG6Ugj7xIwOMUjF8jDpl3tg/1CCKFiuEjFMABxABkVPBmsghpA+/WtZGQy4DDRnz1f3aC7PmUu41dUwI/JFZWsJuKGyar29vF7F7xhmHLcCqIDNGqOFC/Gbka4HPrGE8vvU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=EOJ+QtrW; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="EOJ+QtrW" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7FD0AC4CEF1; Mon, 27 Oct 2025 19:08:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1761592127; bh=1TsHgw3UBX/dEKgE+fRb+VdrVraqadrdYwstlUJ//ss=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=EOJ+QtrWr7ih1HYTS5MoEhdZNyeUtlQWq3iE1G+o+vLNV4KyEv9fCEW0qaBeJw5EP 89KRAb+38aohIhBNTFGtfYpE9Q7TMyRT3PTY80V1gn892vBu/CafisOGC9ftHPijkF /cJ6iKcOgCB0JoPQJFQ7UFGVkzooq4jF9dI+L4o0= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Siddharth Vadapalli , =?UTF-8?q?Krzysztof=20Wilczy=C5=84ski?= , Manivannan Sadhasivam , Sasha Levin Subject: [PATCH 5.15 102/123] PCI: j721e: Enable ACSPCIE Refclk if "ti,syscon-acspcie-proxy-ctrl" exists Date: Mon, 27 Oct 2025 19:36:22 +0100 Message-ID: <20251027183449.118782130@linuxfoundation.org> X-Mailer: git-send-email 2.51.1 In-Reply-To: <20251027183446.381986645@linuxfoundation.org> References: <20251027183446.381986645@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Siddharth Vadapalli [ Upstream commit 82c4be4168e26a5593aaa1002b5678128a638824 ] 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". Link: https://lore.kernel.org/linux-pci/20240829105316.1483684-3-s-vadapalli@ti.com Signed-off-by: Siddharth Vadapalli Signed-off-by: Krzysztof Wilczyński Reviewed-by: Manivannan Sadhasivam Stable-dep-of: f842d3313ba1 ("PCI: j721e: Fix programming sequence of "strap" settings") Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- drivers/pci/controller/cadence/pci-j721e.c | 39 ++++++++++++++++++++++++++++- 1 file changed, 38 insertions(+), 1 deletion(-) --- a/drivers/pci/controller/cadence/pci-j721e.c +++ b/drivers/pci/controller/cadence/pci-j721e.c @@ -46,6 +46,7 @@ enum link_status { #define LANE_COUNT_MASK BIT(8) #define LANE_COUNT(n) ((n) << 8) +#define ACSPCIE_PAD_DISABLE_MASK GENMASK(1, 0) #define GENERATION_SEL_MASK GENMASK(1, 0) #define MAX_LANES 2 @@ -218,6 +219,36 @@ static int j721e_pcie_set_lane_count(str 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) { + dev_err(dev, + "ti,syscon-acspcie-proxy-ctrl has invalid arguments\n"); + return 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); + return ret; + } + + return 0; +} + static int j721e_pcie_ctrl_init(struct j721e_pcie *pcie) { struct device *dev = pcie->dev; @@ -257,7 +288,13 @@ static int j721e_pcie_ctrl_init(struct j return ret; } - return 0; + /* Enable ACSPCIE refclk output if the optional property exists */ + syscon = syscon_regmap_lookup_by_phandle_optional(node, + "ti,syscon-acspcie-proxy-ctrl"); + if (!syscon) + return 0; + + return j721e_enable_acspcie_refclk(pcie, syscon); } static int cdns_ti_pcie_config_read(struct pci_bus *bus, unsigned int devfn,