From patchwork Mon Nov 16 22:03:49 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ira Weiny X-Patchwork-Id: 7631141 Return-Path: X-Original-To: patchwork-linux-rdma@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id DBED29F2E2 for ; Mon, 16 Nov 2015 22:04:10 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id DBACE205B1 for ; Mon, 16 Nov 2015 22:04:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B56AA2055C for ; Mon, 16 Nov 2015 22:04:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750878AbbKPWEH (ORCPT ); Mon, 16 Nov 2015 17:04:07 -0500 Received: from mga03.intel.com ([134.134.136.65]:52811 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751358AbbKPWEF (ORCPT ); Mon, 16 Nov 2015 17:04:05 -0500 Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by orsmga103.jf.intel.com with ESMTP; 16 Nov 2015 14:03:55 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.20,304,1444719600"; d="scan'208";a="852382148" Received: from phlsvsds.ph.intel.com ([10.228.195.38]) by fmsmga002.fm.intel.com with ESMTP; 16 Nov 2015 14:03:53 -0800 Received: from phlsvsds.ph.intel.com (localhost.localdomain [127.0.0.1]) by phlsvsds.ph.intel.com (8.13.8/8.13.8) with ESMTP id tAGM3p0w011245; Mon, 16 Nov 2015 17:03:51 -0500 Received: (from iweiny@localhost) by phlsvsds.ph.intel.com (8.13.8/8.13.8/Submit) id tAGM3pUA011242; Mon, 16 Nov 2015 17:03:51 -0500 X-Authentication-Warning: phlsvsds.ph.intel.com: iweiny set sender to ira.weiny@intel.com using -f From: ira.weiny@intel.com To: gregkh@linuxfoundation.org, devel@driverdev.osuosl.org Cc: dledford@redhat.com, linux-rdma@vger.kernel.org, mike.marciniszyn@intel.com, Dean Luick , Ira Weiny Subject: [PATCH v3] staging/rdma/hfi1: set Gen3 half-swing for integrated devices Date: Mon, 16 Nov 2015 17:03:49 -0500 Message-Id: <1447711429-10389-1-git-send-email-ira.weiny@intel.com> X-Mailer: git-send-email 1.7.1 Sender: linux-rdma-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org X-Spam-Status: No, score=-7.7 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Dean Luick Correctly set half-swing for integrated devices. A0 needs all fields set for CcePcieCtrl. B0 and later only need a few fields set. Reviewed-by: Stuart Summers Signed-off-by: Dean Luick Signed-off-by: Ira Weiny --- Changes from V1: Add comments concerning the very long names. Changes from V2: Remove PC Macro and define short names to be used in the code. drivers/staging/rdma/hfi1/chip_registers.h | 11 ++++ drivers/staging/rdma/hfi1/pcie.c | 82 ++++++++++++++++++++++++++++-- 2 files changed, 89 insertions(+), 4 deletions(-) diff --git a/drivers/staging/rdma/hfi1/chip_registers.h b/drivers/staging/rdma/hfi1/chip_registers.h index bf45de29d8bd..d0deb2278635 100644 --- a/drivers/staging/rdma/hfi1/chip_registers.h +++ b/drivers/staging/rdma/hfi1/chip_registers.h @@ -549,6 +549,17 @@ #define CCE_MSIX_TABLE_UPPER (CCE + 0x000000100008) #define CCE_MSIX_TABLE_UPPER_RESETCSR 0x0000000100000000ull #define CCE_MSIX_VEC_CLR_WITHOUT_INT (CCE + 0x000000110400) +#define CCE_PCIE_CTRL (CCE + 0x0000000000C0) +#define CCE_PCIE_CTRL_PCIE_LANE_BUNDLE_MASK 0x3ull +#define CCE_PCIE_CTRL_PCIE_LANE_BUNDLE_SHIFT 0 +#define CCE_PCIE_CTRL_PCIE_LANE_DELAY_MASK 0xFull +#define CCE_PCIE_CTRL_PCIE_LANE_DELAY_SHIFT 2 +#define CCE_PCIE_CTRL_XMT_MARGIN_OVERWRITE_ENABLE_SHIFT 8 +#define CCE_PCIE_CTRL_XMT_MARGIN_SHIFT 9 +#define CCE_PCIE_CTRL_XMT_MARGIN_GEN1_GEN2_OVERWRITE_ENABLE_MASK 0x1ull +#define CCE_PCIE_CTRL_XMT_MARGIN_GEN1_GEN2_OVERWRITE_ENABLE_SHIFT 12 +#define CCE_PCIE_CTRL_XMT_MARGIN_GEN1_GEN2_MASK 0x7ull +#define CCE_PCIE_CTRL_XMT_MARGIN_GEN1_GEN2_SHIFT 13 #define CCE_REVISION (CCE + 0x000000000000) #define CCE_REVISION2 (CCE + 0x000000000008) #define CCE_REVISION2_HFI_ID_MASK 0x1ull diff --git a/drivers/staging/rdma/hfi1/pcie.c b/drivers/staging/rdma/hfi1/pcie.c index 0b7eafb0fc70..a92ad4577cc8 100644 --- a/drivers/staging/rdma/hfi1/pcie.c +++ b/drivers/staging/rdma/hfi1/pcie.c @@ -867,6 +867,83 @@ static void arm_gasket_logic(struct hfi1_devdata *dd) } /* + * CCE_PCIE_CTRL long name helpers + * We redefine these shorter macros to use in the code while leaving + * chip_registers.h to be autogenerated from the hardware spec. + */ +#define LANE_BUNDLE_MASK CCE_PCIE_CTRL_PCIE_LANE_BUNDLE_MASK +#define LANE_BUNDLE_SHIFT CCE_PCIE_CTRL_PCIE_LANE_BUNDLE_SHIFT +#define LANE_DELAY_MASK CCE_PCIE_CTRL_PCIE_LANE_DELAY_MASK +#define LANE_DELAY_SHIFT CCE_PCIE_CTRL_PCIE_LANE_DELAY_SHIFT +#define MARGIN_OVERWRITE_ENABLE_SHIFT CCE_PCIE_CTRL_XMT_MARGIN_OVERWRITE_ENABLE_SHIFT +#define MARGIN_SHIFT CCE_PCIE_CTRL_XMT_MARGIN_SHIFT +#define MARGIN_G1_G2_OVERWRITE_MASK CCE_PCIE_CTRL_XMT_MARGIN_GEN1_GEN2_OVERWRITE_ENABLE_MASK +#define MARGIN_G1_G2_OVERWRITE_SHIFT CCE_PCIE_CTRL_XMT_MARGIN_GEN1_GEN2_OVERWRITE_ENABLE_SHIFT +#define MARGIN_GEN1_GEN2_MASK CCE_PCIE_CTRL_XMT_MARGIN_GEN1_GEN2_MASK +#define MARGIN_GEN1_GEN2_SHIFT CCE_PCIE_CTRL_XMT_MARGIN_GEN1_GEN2_SHIFT + + /* + * Write xmt_margin for full-swing (WFR-B) or half-swing (WFR-C). + */ +static void write_xmt_margin(struct hfi1_devdata *dd, const char *fname) +{ + u64 pcie_ctrl; + u64 xmt_margin; + u64 xmt_margin_oe; + u64 lane_delay; + u64 lane_bundle; + + pcie_ctrl = read_csr(dd, CCE_PCIE_CTRL); + + /* + * For Discrete, use full-swing. + * - PCIe TX defaults to full-swing. + * Leave this register as default. + * For Integrated, use half-swing + * - Copy xmt_margin and xmt_margin_oe + * from Gen1/Gen2 to Gen3. + */ + if (dd->pcidev->device == PCI_DEVICE_ID_INTEL1) { /* integrated */ + /* extract initial fields */ + xmt_margin = (pcie_ctrl >> MARGIN_GEN1_GEN2_SHIFT) + & MARGIN_GEN1_GEN2_MASK; + xmt_margin_oe = (pcie_ctrl >> MARGIN_G1_G2_OVERWRITE_SHIFT) + & MARGIN_G1_G2_OVERWRITE_MASK; + lane_delay = (pcie_ctrl >> LANE_DELAY_SHIFT) & LANE_DELAY_MASK; + lane_bundle = (pcie_ctrl >> LANE_BUNDLE_SHIFT) + & LANE_BUNDLE_MASK; + + /* + * For A0, EFUSE values are not set. Override with the + * correct values. + */ + if (is_a0(dd)) { + /* + * xmt_margin and OverwiteEnabel should be the + * same for Gen1/Gen2 and Gen3 + */ + xmt_margin = 0x5; + xmt_margin_oe = 0x1; + lane_delay = 0xF; /* Delay 240ns. */ + lane_bundle = 0x0; /* Set to 1 lane. */ + } + + /* overwrite existing values */ + pcie_ctrl = (xmt_margin << MARGIN_GEN1_GEN2_SHIFT) + | (xmt_margin_oe << MARGIN_G1_G2_OVERWRITE_SHIFT) + | (xmt_margin << MARGIN_SHIFT) + | (xmt_margin_oe << MARGIN_OVERWRITE_ENABLE_SHIFT) + | (lane_delay << LANE_DELAY_SHIFT) + | (lane_bundle << LANE_BUNDLE_SHIFT); + + write_csr(dd, CCE_PCIE_CTRL, pcie_ctrl); + } + + dd_dev_info(dd, "%s: program XMT margin, CcePcieCtrl 0x%llx\n", + fname, pcie_ctrl); +} + +/* * Do all the steps needed to transition the PCIe link to Gen3 speed. */ int do_pcie_gen3_transition(struct hfi1_devdata *dd) @@ -1064,11 +1141,8 @@ retry: /* * step 5d: program XMT margin - * Right now, leave the default alone. To change, do a - * read-modify-write of: - * CcePcieCtrl.XmtMargin - * CcePcieCtrl.XmitMarginOverwriteEnable */ + write_xmt_margin(dd, __func__); /* step 5e: disable active state power management (ASPM) */ dd_dev_info(dd, "%s: clearing ASPM\n", __func__);