From patchwork Fri Jul 14 03:52:44 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shawn Lin X-Patchwork-Id: 788063 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 3x7zLK1L13z9s7m for ; Fri, 14 Jul 2017 13:53:13 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753250AbdGNDxL (ORCPT ); Thu, 13 Jul 2017 23:53:11 -0400 Received: from lucky1.263xmail.com ([211.157.147.132]:36751 "EHLO lucky1.263xmail.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753241AbdGNDxK (ORCPT ); Thu, 13 Jul 2017 23:53:10 -0400 Received: from shawn.lin?rock-chips.com (unknown [192.168.167.205]) by lucky1.263xmail.com (Postfix) with ESMTP id 271B864362; Fri, 14 Jul 2017 11:53:07 +0800 (CST) X-263anti-spam: KSV:0; X-MAIL-GRAY: 1 X-MAIL-DELIVERY: 0 X-KSVirus-check: 0 X-ABS-CHECKED: 4 Received: from localhost.localdomain (localhost [127.0.0.1]) by smtp.263.net (Postfix) with ESMTPA id 6A2C53B0; Fri, 14 Jul 2017 11:53:05 +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: <649750208fe33f227b6f341bfc963911> 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 10780L0ROGT; Fri, 14 Jul 2017 11:53:06 +0800 (CST) From: Shawn Lin To: Bjorn Helgaas , Rob Herring , Kishon Vijay Abraham I Cc: Heiko Stuebner , linux-pci@vger.kernel.org, linux-rockchip@lists.infradead.org, Brian Norris , Jeffy Chen , devicetree@vger.kernel.org, Shawn Lin Subject: [RFC PATCH 4/6] PCI: rockchip: idle the inactive PHY(s) Date: Fri, 14 Jul 2017 11:52:44 +0800 Message-Id: <1500004366-241633-3-git-send-email-shawn.lin@rock-chips.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1500004366-241633-1-git-send-email-shawn.lin@rock-chips.com> References: <1500004101-240296-1-git-send-email-shawn.lin@rock-chips.com> <1500004366-241633-1-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 Check the status of all lanes and idle the inactive one(s). Signed-off-by: Shawn Lin --- drivers/pci/host/pcie-rockchip.c | 31 ++++++++++++++++++++++++++++++- 1 file changed, 30 insertions(+), 1 deletion(-) diff --git a/drivers/pci/host/pcie-rockchip.c b/drivers/pci/host/pcie-rockchip.c index a3dc7bd..d678a93 100644 --- a/drivers/pci/host/pcie-rockchip.c +++ b/drivers/pci/host/pcie-rockchip.c @@ -15,6 +15,7 @@ * (at your option) any later version. */ +#include #include #include #include @@ -112,6 +113,9 @@ #define PCIE_CORE_TXCREDIT_CFG1_MUI_SHIFT 16 #define PCIE_CORE_TXCREDIT_CFG1_MUI_ENCODE(x) \ (((x) >> 3) << PCIE_CORE_TXCREDIT_CFG1_MUI_SHIFT) +#define PCIE_CORE_LANE_MAP (PCIE_CORE_CTRL_MGMT_BASE + 0x200) +#define PCIE_CORE_LANE_MAP_MASK 0x0000000f +#define PCIE_CORE_LANE_MAP_REVERSE BIT(16) #define PCIE_CORE_INT_STATUS (PCIE_CORE_CTRL_MGMT_BASE + 0x20c) #define PCIE_CORE_INT_PRFPE BIT(0) #define PCIE_CORE_INT_CRFPE BIT(1) @@ -311,6 +315,18 @@ static int rockchip_pcie_valid_device(struct rockchip_pcie *rockchip, return 1; } +static u8 rockchip_pcie_lane_map(struct rockchip_pcie *rockchip) +{ + u32 val = rockchip_pcie_read(rockchip, PCIE_CORE_LANE_MAP); + u8 map = val & PCIE_CORE_LANE_MAP_MASK; + + /* The link may be using a reverse-indexed mapping. */ + if (val & PCIE_CORE_LANE_MAP_REVERSE) + map = bitrev8(map) >> 4; + + return map; +} + static int rockchip_pcie_rd_own_conf(struct rockchip_pcie *rockchip, int where, int size, u32 *val) { @@ -618,7 +634,8 @@ static int rockchip_pcie_manipulate_phys(struct rockchip_pcie *rockchip, static int rockchip_pcie_init_port(struct rockchip_pcie *rockchip) { struct device *dev = rockchip->dev; - int err; + int err, i; + u8 lane_map; u32 status; gpiod_set_value(rockchip->ep_gpio, 0); @@ -791,6 +808,18 @@ static int rockchip_pcie_init_port(struct rockchip_pcie *rockchip) PCIE_CORE_PL_CONF_LANE_SHIFT); dev_dbg(dev, "current link width is x%d\n", status); + if (!rockchip->legacy_phy) { + /* power off unused lane(s) */ + lane_map = rockchip_pcie_lane_map(rockchip); + for (i = 0; i < MAX_LANE_NUM; i++) { + if (lane_map & BIT(i)) + continue; + + dev_err(dev, "idling lane %d\n", i); + phy_power_off(rockchip->phys[i]); + } + } + rockchip_pcie_write(rockchip, ROCKCHIP_VENDOR_ID, PCIE_CORE_CONFIG_VENDOR); rockchip_pcie_write(rockchip,