From patchwork Tue Aug 6 09:48:15 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: AngeloGioacchino Del Regno X-Patchwork-Id: 13754610 Received: from sender4-op-o12.zoho.com (sender4-op-o12.zoho.com [136.143.188.12]) (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 8C21414F12D; Tue, 6 Aug 2024 09:48:58 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=pass smtp.client-ip=136.143.188.12 ARC-Seal: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722937740; cv=pass; b=D3ythVgJzR7EvtWzhjXJoNvh4lY44s435rw0WidFGKLwrYbn7oMmbjE9Y5v1+oaQ66hgjW5p3wz2YmMkrOQingf9kNq5KVLL1mHb0EfPnvoU7SZpv7XNl0Tj9eTmgUIxb4LWkKuSjry5q4r7D3THXZ/rELmEfM4G2FyPPoAF0Xc= ARC-Message-Signature: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722937740; c=relaxed/simple; bh=fZdjyayTuu9UvFRgtoqB8hHi6KMCJgod1lb6P7bxbIY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=D04qOGB7hBArFyqVfVmnNvsjYd5p54rWjRVHV/eYrsxSMVF8KjggrlRsHx8hwt1xAo4M/N2/0chpzsEOIDF4BiWLEZfNwRjg6O0UmUlXVQ36QZ6KObGEfACQb/ZQkFbfuTWisJ/EQmWEWs3g7cbk4VonCztrjs3Fk6LokBGOI0g= ARC-Authentication-Results: i=2; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=collabora.com; spf=pass smtp.mailfrom=collabora.com; dkim=pass (1024-bit key) header.d=collabora.com header.i=angelogioacchino.delregno@collabora.com header.b=EKRGOGE1; arc=pass smtp.client-ip=136.143.188.12 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=collabora.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=collabora.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=collabora.com header.i=angelogioacchino.delregno@collabora.com header.b="EKRGOGE1" ARC-Seal: i=1; a=rsa-sha256; t=1722937720; cv=none; d=zohomail.com; s=zohoarc; b=cO21j/DmKuLnwAifaLnEc+0CkD7YvF/ie0hc87FJuoUoeqkRaUjmMCJh2EQjeoFquepAMhnNb6qCyK+/y67anTWh1Zmjy2PmlJBOx+wxyOWOFCMaGRf0gMzGwbvikSoJ/D0tLhtjy0fB+w331XcHKb63WfPneSZgyMUbBA87HtE= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1722937720; h=Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:MIME-Version:Message-ID:References:Subject:Subject:To:To:Message-Id:Reply-To; bh=+jqhjvzQ/FPLz1d6c7zEKQLmyQTkCaXyYpYFtd3LTmg=; b=W2anfFn55Jsc31ROFRWRMjIybuzXceWk8lmtmdyoTS8Y3HmvidBL1YYFPA78sJPZ/+Y4FLaoirxPuzVmbu/h2zC4dzsHD7G1V79xWhL2terFjPTYvopaV5G0oWq8rokauNj0Q3NPsbPGQaoDrGBonSs4VqtA4f3Ebgg12oXy6wo= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass header.i=collabora.com; spf=pass smtp.mailfrom=angelogioacchino.delregno@collabora.com; dmarc=pass header.from= DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; t=1722937720; s=zohomail; d=collabora.com; i=angelogioacchino.delregno@collabora.com; h=From:From:To:To:Cc:Cc:Subject:Subject:Date:Date:Message-ID:In-Reply-To:References:MIME-Version:Content-Transfer-Encoding:Message-Id:Reply-To; bh=+jqhjvzQ/FPLz1d6c7zEKQLmyQTkCaXyYpYFtd3LTmg=; b=EKRGOGE1+2vpeRabrjCH+qv3BCJW/qwh9/NMKiCdTbjNy7snZ2TqFeFSGSAMUMwv i6jaEET2RCyO190wQhRXnH0Ss+jOV0V/S4XHlxY96Gp7QY/KDf+PzpkmzrsH/eobXdh aixcdnuUGhsA5nE2UMBa2g+CIeqDfvrYsZuALfdE= Received: by mx.zohomail.com with SMTPS id 1722937718892770.851054340109; Tue, 6 Aug 2024 02:48:38 -0700 (PDT) From: AngeloGioacchino Del Regno To: linux-pci@vger.kernel.org Cc: ryder.lee@mediatek.com, jianjun.wang@mediatek.com, lpieralisi@kernel.org, kw@linux.com, robh@kernel.org, bhelgaas@google.com, matthias.bgg@gmail.com, angelogioacchino.delregno@collabora.com, linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kernel@collabora.com Subject: [PATCH 1/2] PCI: mediatek-gen3: Add support for setting max-link-speed limit Date: Tue, 6 Aug 2024 11:48:15 +0200 Message-ID: <20240806094816.92137-2-angelogioacchino.delregno@collabora.com> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240806094816.92137-1-angelogioacchino.delregno@collabora.com> References: <20240806094816.92137-1-angelogioacchino.delregno@collabora.com> Precedence: bulk X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ZohoMailClient: External Add support for respecting the max-link-speed devicetree property, forcing a maximum speed (Gen) for a PCI-Express port. Since the MediaTek PCIe Gen3 controllers also expose the maximum supported link speed in the PCIE_BASE_CFG register, if property max-link-speed is specified in devicetree, validate it against the controller capabilities and proceed setting the limitations only if the wanted Gen is lower than the maximum one that is supported by the controller itself (otherwise it makes no sense!). Signed-off-by: AngeloGioacchino Del Regno --- drivers/pci/controller/pcie-mediatek-gen3.c | 56 ++++++++++++++++++++- 1 file changed, 54 insertions(+), 2 deletions(-) diff --git a/drivers/pci/controller/pcie-mediatek-gen3.c b/drivers/pci/controller/pcie-mediatek-gen3.c index b7e8e24f6a40..905dc635ead3 100644 --- a/drivers/pci/controller/pcie-mediatek-gen3.c +++ b/drivers/pci/controller/pcie-mediatek-gen3.c @@ -6,6 +6,7 @@ * Author: Jianjun Wang */ +#include #include #include #include @@ -24,7 +25,11 @@ #include "../pci.h" +#define PCIE_BASE_CFG_REG 0x14 +#define PCIE_BASE_CFG_SPEED_MASK GENMASK(15, 8) + #define PCIE_SETTING_REG 0x80 +#define PCIE_SETTING_GEN_SUPPORT_MASK GENMASK(14, 12) #define PCIE_PCI_IDS_1 0x9c #define PCI_CLASS(class) (class << 8) #define PCIE_RC_MODE BIT(0) @@ -100,6 +105,9 @@ #define PCIE_ATR_TLP_TYPE_MEM PCIE_ATR_TLP_TYPE(0) #define PCIE_ATR_TLP_TYPE_IO PCIE_ATR_TLP_TYPE(2) +#define PCIE_CONF_LINK2_CTL_STS 0x10b0 +#define PCIE_CONF_LINK2_LCR2_LINK_SPEED GENMASK(3, 0) + /** * struct mtk_msi_set - MSI information for each set * @base: IO mapped register base @@ -122,6 +130,7 @@ struct mtk_msi_set { * @phy: PHY controller block * @clks: PCIe clocks * @num_clks: PCIe clocks count for this port + * @max_link_speed: Maximum link speed (PCIe Gen) for this port * @irq: PCIe controller interrupt number * @saved_irq_state: IRQ enable state saved at suspend time * @irq_lock: lock protecting IRQ register access @@ -141,6 +150,7 @@ struct mtk_gen3_pcie { struct phy *phy; struct clk_bulk_data *clks; int num_clks; + u8 max_link_speed; int irq; u32 saved_irq_state; @@ -340,11 +350,27 @@ static int mtk_pcie_startup_port(struct mtk_gen3_pcie *pcie) int err; u32 val; - /* Set as RC mode */ + /* Set as RC mode and set controller PCIe Gen speed restriction, if any */ val = readl_relaxed(pcie->base + PCIE_SETTING_REG); val |= PCIE_RC_MODE; + if (pcie->max_link_speed) { + val &= ~PCIE_SETTING_GEN_SUPPORT_MASK; + + /* Can enable link speed support only from Gen2 onwards */ + if (pcie->max_link_speed >= 2) + val |= FIELD_PREP(PCIE_SETTING_GEN_SUPPORT_MASK, + GENMASK(pcie->max_link_speed - 2, 0)); + } writel_relaxed(val, pcie->base + PCIE_SETTING_REG); + /* Set Link Control 2 (LNKCTL2) speed restriction, if any */ + if (pcie->max_link_speed) { + val = readl_relaxed(pcie->base + PCIE_CONF_LINK2_CTL_STS); + val &= PCIE_CONF_LINK2_LCR2_LINK_SPEED; + val |= FIELD_PREP(PCIE_CONF_LINK2_LCR2_LINK_SPEED, pcie->max_link_speed); + writel_relaxed(val, pcie->base + PCIE_CONF_LINK2_CTL_STS); + } + /* Set class code */ val = readl_relaxed(pcie->base + PCIE_PCI_IDS_1); val &= ~GENMASK(31, 8); @@ -887,9 +913,21 @@ static void mtk_pcie_power_down(struct mtk_gen3_pcie *pcie) reset_control_assert(pcie->phy_reset); } +static int mtk_pcie_get_controller_max_link_speed(struct mtk_gen3_pcie *pcie) +{ + u32 val; + int ret; + + val = readl_relaxed(pcie->base + PCIE_BASE_CFG_REG); + val = FIELD_GET(PCIE_BASE_CFG_SPEED_MASK, val); + ret = fls(val); + + return ret > 0 ? ret : -EINVAL; +} + static int mtk_pcie_setup(struct mtk_gen3_pcie *pcie) { - int err; + int max_speed, err; err = mtk_pcie_parse_port(pcie); if (err) @@ -908,6 +946,20 @@ static int mtk_pcie_setup(struct mtk_gen3_pcie *pcie) if (err) return err; + err = of_pci_get_max_link_speed(pcie->dev->of_node); + if (err > 0) { + /* Get the maximum speed supported by the controller */ + max_speed = mtk_pcie_get_controller_max_link_speed(pcie); + + /* Set max_link_speed only if the controller supports it */ + if (max_speed >= 0 && max_speed <= err) { + pcie->max_link_speed = err; + dev_dbg(pcie->dev, + "Max controller link speed Gen%u, override to Gen%u", + max_speed, pcie->max_link_speed); + } + } + /* Try link up */ err = mtk_pcie_startup_port(pcie); if (err)