From patchwork Tue May 3 20:09:29 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Serge Semin X-Patchwork-Id: 569115 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id C41E4C433EF for ; Tue, 3 May 2022 20:10:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231851AbiECUOJ (ORCPT ); Tue, 3 May 2022 16:14:09 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48992 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242262AbiECUNs (ORCPT ); Tue, 3 May 2022 16:13:48 -0400 Received: from mail.baikalelectronics.ru (mail.baikalelectronics.com [87.245.175.226]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 8C21D38D; Tue, 3 May 2022 13:10:14 -0700 (PDT) Received: from mail.baikalelectronics.ru (unknown [192.168.51.25]) by mail.baikalelectronics.ru (Postfix) with ESMTP id CB411BC2; Tue, 3 May 2022 23:10:47 +0300 (MSK) DKIM-Filter: OpenDKIM Filter v2.11.0 mail.baikalelectronics.ru CB411BC2 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=baikalelectronics.ru; s=mail; t=1651608647; bh=jCdYikKW5d7lD5eqc9AjF8QycAGAXvdMRkyDuad2vIQ=; h=From:To:CC:Subject:Date:In-Reply-To:References:From; b=KeyjznIt6Wfs29n8CGlxuCGXESIgXDahjFeEo3sFQ98FCfmVMewxRD+37Qji3aqhR qOdDtZpDVRsKP+e0PSkGQQtFw+2TyhL+ZFBveRZlkJwshfWzqbqGQjPE5LFM/jYoKQ R8Y0SchDZKIHIKwsYOfS8UCBLqWXpdW5WA3240gc= Received: from localhost (192.168.53.207) by mail (192.168.51.25) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Tue, 3 May 2022 23:10:13 +0300 From: Serge Semin To: Damien Le Moal , Hans de Goede , Jens Axboe CC: Serge Semin , Serge Semin , Alexey Malahov , Pavel Parkhomenko , Rob Herring , , , Subject: [PATCH v2 14/23] ata: libahci: Discard redundant force_port_map parameter Date: Tue, 3 May 2022 23:09:29 +0300 Message-ID: <20220503200938.18027-15-Sergey.Semin@baikalelectronics.ru> In-Reply-To: <20220503200938.18027-1-Sergey.Semin@baikalelectronics.ru> References: <20220503200938.18027-1-Sergey.Semin@baikalelectronics.ru> MIME-Version: 1.0 X-ClientProxiedBy: MAIL.baikal.int (192.168.51.25) To mail (192.168.51.25) Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org Currently there are four port-map-related fields declared in the ahci_host_priv structure and used to setup the HBA ports mapping. First the ports-mapping is read from the PI register and immediately stored in the saved_port_map field. If forced_port_map is initialized with non-zero value then its value will have greater priority over the value read from PI, thus it will override the saved_port_map field. That value will be then masked by a non-zero mask_port_map field and after some sanity checks it will be stored in the ahci_host_priv.port_map field as a final port mapping. As you can see the logic is a bit too complicated for such a simple task. We can freely get rid from at least one of the fields with no change to the implemented semantic. The force_port_map field can be replaced with taking non-zero saved_port_map value into account. So if saved_port_map is pre-initialized by the low level drivers (platform drivers) then it will have greater priority over the value read from PI register and will be used as actual HBA ports mapping later on. Thus the ports map forcing task will be just transferred from the force_port_map to saved_port_map field. This modification will perfectly fit into the feature of having OF-based initialization of the HW-init HBA CSR fields we are about to introduce in the next commit. Signed-off-by: Serge Semin --- drivers/ata/ahci.c | 2 +- drivers/ata/ahci.h | 1 - drivers/ata/libahci.c | 10 ++++++---- drivers/ata/libahci_platform.c | 2 +- 4 files changed, 8 insertions(+), 7 deletions(-) diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c index 397dfd27c90d..9bc8fa77e92f 100644 --- a/drivers/ata/ahci.c +++ b/drivers/ata/ahci.c @@ -656,7 +656,7 @@ static void ahci_pci_save_initial_config(struct pci_dev *pdev, { if (pdev->vendor == PCI_VENDOR_ID_JMICRON && pdev->device == 0x2361) { dev_info(&pdev->dev, "JMB361 has only one port\n"); - hpriv->force_port_map = 1; + hpriv->saved_port_map = 1; } /* diff --git a/drivers/ata/ahci.h b/drivers/ata/ahci.h index f501531bd1b3..0e66446a5883 100644 --- a/drivers/ata/ahci.h +++ b/drivers/ata/ahci.h @@ -327,7 +327,6 @@ struct ahci_port_priv { struct ahci_host_priv { /* Input fields */ unsigned int flags; /* AHCI_HFLAG_* */ - u32 force_port_map; /* force port map */ u32 mask_port_map; /* mask out particular bits */ void __iomem * mmio; /* bus-independent mem map */ diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c index cf8c7fd59ada..000a7072614f 100644 --- a/drivers/ata/libahci.c +++ b/drivers/ata/libahci.c @@ -453,7 +453,6 @@ void ahci_save_initial_config(struct device *dev, struct ahci_host_priv *hpriv) * reset. Values without are used for driver operation. */ hpriv->saved_cap = cap = readl(mmio + HOST_CAP); - hpriv->saved_port_map = port_map = readl(mmio + HOST_PORTS_IMPL); /* CAP2 register is only defined for AHCI 1.2 and later */ vers = readl(mmio + HOST_VERSION); @@ -517,10 +516,13 @@ void ahci_save_initial_config(struct device *dev, struct ahci_host_priv *hpriv) cap &= ~HOST_CAP_SXS; } - if (hpriv->force_port_map && port_map != hpriv->force_port_map) { + /* Override the HBA ports mapping if the platform needs it */ + port_map = readl(mmio + HOST_PORTS_IMPL); + if (hpriv->saved_port_map && port_map != hpriv->saved_port_map) { dev_info(dev, "forcing port_map 0x%x -> 0x%x\n", - port_map, hpriv->force_port_map); - port_map = hpriv->force_port_map; + port_map, hpriv->saved_port_map); + port_map = hpriv->saved_port_map; + } else { hpriv->saved_port_map = port_map; } diff --git a/drivers/ata/libahci_platform.c b/drivers/ata/libahci_platform.c index f5ee2f9d014b..56aced7a76cd 100644 --- a/drivers/ata/libahci_platform.c +++ b/drivers/ata/libahci_platform.c @@ -553,7 +553,7 @@ struct ahci_host_priv *ahci_platform_get_resources(struct platform_device *pdev, } of_property_read_u32(dev->of_node, - "ports-implemented", &hpriv->force_port_map); + "ports-implemented", &hpriv->saved_port_map); if (child_nodes) { for_each_child_of_node(dev->of_node, child) {