From patchwork Wed Oct 5 08:50:16 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shawn Lin X-Patchwork-Id: 9362625 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 5D112600C8 for ; Wed, 5 Oct 2016 08:46:23 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 4DCFF286F8 for ; Wed, 5 Oct 2016 08:46:23 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 41CA028702; Wed, 5 Oct 2016 08:46:23 +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=unavailable version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 5A738286F8 for ; Wed, 5 Oct 2016 08:46:20 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.85_2 #1 (Red Hat Linux)) id 1brhqE-0001yC-1W; Wed, 05 Oct 2016 08:46:18 +0000 Received: from lucky1.263xmail.com ([211.157.147.136]) by bombadil.infradead.org with esmtps (Exim 4.85_2 #1 (Red Hat Linux)) id 1brhqB-0001wv-8H for linux-rockchip@lists.infradead.org; Wed, 05 Oct 2016 08:46:16 +0000 Received: from shawn.lin?rock-chips.com (unknown [192.168.167.192]) by lucky1.263xmail.com (Postfix) with ESMTP id E8EDF10D; Wed, 5 Oct 2016 16:45:49 +0800 (CST) X-263anti-spam: KSV:0; X-MAIL-GRAY: 1 X-MAIL-DELIVERY: 0 X-KSVirus-check: 0 X-ABS-CHECKED: 4 X-ADDR-CHECKED4: 1 Received: from localhost.localdomain (localhost [127.0.0.1]) by smtp.263.net (Postfix) with ESMTP id B3B3A39F; Wed, 5 Oct 2016 16:45:50 +0800 (CST) X-RL-SENDER: shawn.lin@rock-chips.com X-FST-TO: bhelgaas@google.com X-SENDER-IP: 58.22.7.114 X-LOGIN-NAME: shawn.lin@rock-chips.com X-UNIQUE-TAG: <958cb3ebacce501a651a33926f5756f9> X-ATTACHMENT-NUM: 0 X-SENDER: lintao@rock-chips.com X-DNS-TYPE: 0 Received: from localhost.localdomain (unknown [58.22.7.114]) by smtp.263.net (Postfix) whith ESMTP id 27858F68ZAQ; Wed, 05 Oct 2016 16:45:51 +0800 (CST) From: Shawn Lin To: Bjorn Helgaas Subject: [PATCH 1/2] PCI: rockchip: Provide captured slot power limit and scale Date: Wed, 5 Oct 2016 16:50:16 +0800 Message-Id: <1475657417-29163-1-git-send-email-shawn.lin@rock-chips.com> X-Mailer: git-send-email 1.8.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20161005_014615_512948_3B3F3027 X-CRM114-Status: UNSURE ( 9.18 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-rockchip@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: Upstream kernel work for Rockchip platforms List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Wenrui Li , linux-pci@vger.kernel.org, Shawn Lin , Brian Norris , linux-rockchip@lists.infradead.org, Rajat Jain MIME-Version: 1.0 Sender: "Linux-rockchip" Errors-To: linux-rockchip-bounces+patchwork-linux-rockchip=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP If vpcie3v3 is available, we could provide these information via RC's configure register to make EP able to know the power limit. Signed-off-by: Shawn Lin --- drivers/pci/host/pcie-rockchip.c | 40 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+) diff --git a/drivers/pci/host/pcie-rockchip.c b/drivers/pci/host/pcie-rockchip.c index b8c82fc..7d16669 100644 --- a/drivers/pci/host/pcie-rockchip.c +++ b/drivers/pci/host/pcie-rockchip.c @@ -135,6 +135,10 @@ #define PCIE_RC_CONFIG_VENDOR (PCIE_RC_CONFIG_BASE + 0x00) #define PCIE_RC_CONFIG_RID_CCR (PCIE_RC_CONFIG_BASE + 0x08) #define PCIE_RC_CONFIG_SCC_SHIFT 16 +#define PCIE_RC_CONFIG_DCR (PCIE_RC_CONFIG_BASE + 0xc4) +#define PCIE_RC_CONFIG_DCR_CSPL_SHIFT 18 +#define PCIE_RC_CONFIG_DCR_CSPL_LIMIT 0xff +#define PCIE_RC_CONFIG_DCR_CPLS_SHIFT 26 #define PCIE_RC_CONFIG_LCS (PCIE_RC_CONFIG_BASE + 0xd0) #define PCIE_RC_CONFIG_LCS_RETRAIN_LINK BIT(5) #define PCIE_RC_CONFIG_LCS_LBMIE BIT(10) @@ -395,6 +399,40 @@ static struct pci_ops rockchip_pcie_ops = { .write = rockchip_pcie_wr_conf, }; +static void rockchip_pcie_set_power_limit(struct rockchip_pcie *rockchip) +{ + u32 status, curr, scale, power; + + if (IS_ERR(rockchip->vpcie3v3)) + return; + + /* + * Set RC's captured slot power limit and scale if + * vpcie3v3 available. The default values are both zero + * which means the software should set these two according + * to the actual power supply. + */ + curr = regulator_get_current_limit(rockchip->vpcie3v3); + if (curr > 0) { + scale = 3; /* 0.001x */ + curr = curr / 1000; /* convert to mA */ + power = (curr * 3300) / 1000; /* milliwatt */ + while (power > PCIE_RC_CONFIG_DCR_CSPL_LIMIT) { + if (!scale) { + dev_warn(rockchip->dev, "invalid power supply\n"); + return; + } + scale--; + power = power / 10; + } + + status = rockchip_pcie_read(rockchip, PCIE_RC_CONFIG_DCR); + status |= (power << PCIE_RC_CONFIG_DCR_CSPL_SHIFT) | + (scale << PCIE_RC_CONFIG_DCR_CPLS_SHIFT); + rockchip_pcie_write(rockchip, status, PCIE_RC_CONFIG_DCR); + } +} + /** * rockchip_pcie_init_port - Initialize hardware * @rockchip: PCIe port information @@ -496,6 +534,8 @@ static int rockchip_pcie_init_port(struct rockchip_pcie *rockchip) (PCIE_CORE_CTRL_PLC1_FTS_CNT << PCIE_CORE_CTRL_PLC1_FTS_SHIFT); rockchip_pcie_write(rockchip, status, PCIE_CORE_CTRL_PLC1); + rockchip_pcie_set_power_limit(rockchip); + /* Enable Gen1 training */ rockchip_pcie_write(rockchip, PCIE_CLIENT_LINK_TRAIN_ENABLE, PCIE_CLIENT_CONFIG);