From patchwork Tue Oct 11 04:26:27 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shawn Lin X-Patchwork-Id: 9370103 X-Patchwork-Delegate: bhelgaas@google.com 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 8FDE860487 for ; Tue, 11 Oct 2016 04:20:59 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 830F228D37 for ; Tue, 11 Oct 2016 04:20:59 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 7776F28D97; Tue, 11 Oct 2016 04:20:59 +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=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 1443328D37 for ; Tue, 11 Oct 2016 04:20:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752013AbcJKEUx (ORCPT ); Tue, 11 Oct 2016 00:20:53 -0400 Received: from lucky1.263xmail.com ([211.157.147.130]:45952 "EHLO lucky1.263xmail.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751592AbcJKEUk (ORCPT ); Tue, 11 Oct 2016 00:20:40 -0400 Received: from shawn.lin?rock-chips.com (unknown [192.168.167.175]) by lucky1.263xmail.com (Postfix) with ESMTP id 17B361EE657; Tue, 11 Oct 2016 12:20:26 +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 7A7CA308; Tue, 11 Oct 2016 12:20:25 +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: X-ATTACHMENT-NUM: 0 X-SENDER: lintao@rock-chips.com X-DNS-TYPE: 0 Received: from unknown (unknown [58.22.7.114]) by smtp.263.net (Postfix) whith SMTP id 27797APJJR4; Tue, 11 Oct 2016 12:20:26 +0800 (CST) From: Shawn Lin To: Bjorn Helgaas , Rob Herring Cc: linux-pci@vger.kernel.org, linux-rockchip@lists.infradead.org, Rajat Jain , Wenrui Li , Brian Norris , devicetree@vger.kernel.org, Shawn Lin Subject: [PATCH v6 3/3] PCI: rockchip: Specify the link capability Date: Tue, 11 Oct 2016 12:26:27 +0800 Message-Id: <1476159987-31372-3-git-send-email-shawn.lin@rock-chips.com> X-Mailer: git-send-email 1.8.0 In-Reply-To: <1476159987-31372-1-git-send-email-shawn.lin@rock-chips.com> References: <1476159987-31372-1-git-send-email-shawn.lin@rock-chips.com> Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Brian Norris rk3399 supports PCIe 2.x link speeds marginally at best, and on some boards, the link won't train at 5 GT/s at all. Rather than sacrifice 500ms waiting for training that will never happen, let's use the helper function, of_get_pci_max_link_speed, to get the max link speed from DT and specify link capability. Signed-off-by: Brian Norris Signed-off-by: Shawn Lin --- Changes in v6: - user helper function of_get_pci_max_link_speed and use gen2 by default if finding any errors from of_get_pci_max_link_speed. It could be backward compatibe to the old dtb. (Suggested by Rob) Changes in v5: - rebase the code since it isn't cleanly applied after Bjorn's cleanup Changes in v4: - define link_gen as u32 - elaborate more for rockchip,max-link-speed on doc Changes in v3: - Cast a warning for invalid max link speed and use gen1 for it. That looks better than v2. (Suggested by Brian) Changes in v2: - rename the property to rockchip,max-link-speed according to Bjorn's recommendation and take some bits from imx6q-pcie to make this requirement more consisent. drivers/pci/host/pcie-rockchip.c | 58 +++++++++++++++++++++++++--------------- 1 file changed, 36 insertions(+), 22 deletions(-) diff --git a/drivers/pci/host/pcie-rockchip.c b/drivers/pci/host/pcie-rockchip.c index b3548d0..7125e35 100644 --- a/drivers/pci/host/pcie-rockchip.c +++ b/drivers/pci/host/pcie-rockchip.c @@ -53,6 +53,7 @@ #define PCIE_CLIENT_ARI_ENABLE HIWORD_UPDATE_BIT(0x0008) #define PCIE_CLIENT_CONF_LANE_NUM(x) HIWORD_UPDATE(0x0030, ENCODE_LANES(x)) #define PCIE_CLIENT_MODE_RC HIWORD_UPDATE_BIT(0x0040) +#define PCIE_CLIENT_GEN_SEL_1 HIWORD_UPDATE(0x0080, 0) #define PCIE_CLIENT_GEN_SEL_2 HIWORD_UPDATE_BIT(0x0080) #define PCIE_CLIENT_BASIC_STATUS1 (PCIE_CLIENT_BASE + 0x48) #define PCIE_CLIENT_LINK_STATUS_UP 0x00300000 @@ -200,6 +201,7 @@ struct rockchip_pcie { struct gpio_desc *ep_gpio; u32 lanes; u8 root_bus_nr; + int link_gen; struct device *dev; struct irq_domain *irq_domain; }; @@ -437,13 +439,19 @@ static int rockchip_pcie_init_port(struct rockchip_pcie *rockchip) return err; } + if (rockchip->link_gen == 2) + rockchip_writel(rockchip, PCIE_CLIENT_CONFIG, + PCIE_CLIENT_GEN_SEL_2); + else + rockchip_writel(rockchip, PCIE_CLIENT_CONFIG, + PCIE_CLIENT_GEN_SEL_1); + rockchip_writel(rockchip, PCIE_CLIENT_CONFIG, PCIE_CLIENT_CONF_ENABLE | PCIE_CLIENT_LINK_TRAIN_ENABLE | PCIE_CLIENT_ARI_ENABLE | PCIE_CLIENT_CONF_LANE_NUM(rockchip->lanes) | - PCIE_CLIENT_MODE_RC | - PCIE_CLIENT_GEN_SEL_2); + PCIE_CLIENT_MODE_RC); err = phy_power_on(rockchip->phy); if (err) { @@ -519,29 +527,31 @@ static int rockchip_pcie_init_port(struct rockchip_pcie *rockchip) msleep(20); } - /* - * Enable retrain for gen2. This should be configured only after - * gen1 finished. - */ - status = rockchip_readl(rockchip, PCIE_RC_CONFIG_LCS); - status |= PCIE_RC_CONFIG_LCS_RETRAIN_LINK; - rockchip_writel(rockchip, PCIE_RC_CONFIG_LCS, status); + if (rockchip->link_gen == 2) { + /* + * Enable retrain for gen2. This should be configured + * only after gen1 finished. + */ + status = rockchip_readl(rockchip, PCIE_RC_CONFIG_LCS); + status |= PCIE_RC_CONFIG_LCS_RETRAIN_LINK; + rockchip_writel(rockchip, PCIE_RC_CONFIG_LCS, status); + + timeout = jiffies + msecs_to_jiffies(500); + for (;;) { + status = rockchip_readl(rockchip, PCIE_CORE_CTRL); + if ((status & PCIE_CORE_PL_CONF_SPEED_MASK) == + PCIE_CORE_PL_CONF_SPEED_5G) { + dev_dbg(dev, "PCIe link training gen2 pass!\n"); + break; + } - timeout = jiffies + msecs_to_jiffies(500); - for (;;) { - status = rockchip_readl(rockchip, PCIE_CORE_CTRL); - if ((status & PCIE_CORE_PL_CONF_SPEED_MASK) == - PCIE_CORE_PL_CONF_SPEED_5G) { - dev_dbg(dev, "PCIe link training gen2 pass!\n"); - break; - } + if (time_after(jiffies, timeout)) { + dev_dbg(dev, "PCIe link training gen2 timeout, fall back to gen1!\n"); + break; + } - if (time_after(jiffies, timeout)) { - dev_dbg(dev, "PCIe link training gen2 timeout, fall back to gen1!\n"); - break; + msleep(20); } - - msleep(20); } /* Check the final link width from negotiated lane counter from MGMT */ @@ -747,6 +757,10 @@ static int rockchip_pcie_parse_dt(struct rockchip_pcie *rockchip) rockchip->lanes = 1; } + rockchip->link_gen = of_get_pci_max_link_speed(node); + if (rockchip->link_gen < 0 || rockchip->link_gen > 2) + rockchip->link_gen = 2; + rockchip->core_rst = devm_reset_control_get(dev, "core"); if (IS_ERR(rockchip->core_rst)) { if (PTR_ERR(rockchip->core_rst) != -EPROBE_DEFER)