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Tue, 21 Jul 2020 05:11:02 -0400 X-MC-Unique: bcpa3c4gN1WBXrnUq6QFnw-1 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 4BE5D100CCC0; Tue, 21 Jul 2020 09:11:00 +0000 (UTC) Received: from [10.36.113.158] (ovpn-113-158.ams2.redhat.com [10.36.113.158]) by smtp.corp.redhat.com (Postfix) with ESMTP id 47C2219934; Tue, 21 Jul 2020 09:10:56 +0000 (UTC) Subject: Re: [PATCH v2] iommu/mediatek: check 4GB mode by reading infracfg To: Miles Chen , Joerg Roedel , Matthias Brugger , Rob Herring Cc: iommu@lists.linux-foundation.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org, wsd_upstream@mediatek.com, Mike Rapoport , Yong Wu , Yingjoe Chen , Christoph Hellwig , Chao Hao References: <20200721021619.25575-1-miles.chen@mediatek.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.9.0 MIME-Version: 1.0 In-Reply-To: <20200721021619.25575-1-miles.chen@mediatek.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 21.07.20 04:16, Miles Chen wrote: > In previous discussion [1] and [2], we found that it is risky to > use max_pfn or totalram_pages to tell if 4GB mode is enabled. > > Check 4GB mode by reading infracfg register, remove the usage > of the un-exported symbol max_pfn. > > This is a step towards building mtk_iommu as a kernel module. > > Change since v1: > 1. remove the phandle usage, search for infracfg instead [3] > 2. use infracfg instead of infracfg_regmap > 3. move infracfg definitaions to linux/soc/mediatek/infracfg.h > 4. update enable_4GB only when has_4gb_mode Nit: We tend to place such information below the "---" (adding a second one) such that this information is discarded when the patch is picked up. > > [1] https://lkml.org/lkml/2020/6/3/733 > [2] https://lkml.org/lkml/2020/6/4/136 > [3] https://lkml.org/lkml/2020/7/15/1147 > > Cc: Mike Rapoport > Cc: David Hildenbrand > Cc: Yong Wu > Cc: Yingjoe Chen > Cc: Christoph Hellwig > Cc: Yong Wu > Cc: Chao Hao > Cc: Rob Herring > Cc: Matthias Brugger > Signed-off-by: Miles Chen > --- > drivers/iommu/mtk_iommu.c | 26 +++++++++++++++++++++----- > include/linux/soc/mediatek/infracfg.h | 3 +++ > 2 files changed, 24 insertions(+), 5 deletions(-) > > diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c > index 2be96f1cdbd2..16765f532853 100644 > --- a/drivers/iommu/mtk_iommu.c > +++ b/drivers/iommu/mtk_iommu.c > @@ -3,7 +3,6 @@ > * Copyright (c) 2015-2016 MediaTek Inc. > * Author: Yong Wu > */ > -#include > #include > #include > #include > @@ -15,13 +14,16 @@ > #include > #include > #include > +#include > #include > #include > #include > #include > #include > +#include > #include > #include > +#include > #include > #include > > @@ -599,8 +601,10 @@ static int mtk_iommu_probe(struct platform_device *pdev) > struct resource *res; > resource_size_t ioaddr; > struct component_match *match = NULL; > + struct regmap *infracfg; > void *protect; > int i, larb_nr, ret; > + u32 val; > > data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); > if (!data) > @@ -614,10 +618,22 @@ static int mtk_iommu_probe(struct platform_device *pdev) > return -ENOMEM; > data->protect_base = ALIGN(virt_to_phys(protect), MTK_PROTECT_PA_ALIGN); > > - /* Whether the current dram is over 4GB */ > - data->enable_4GB = !!(max_pfn > (BIT_ULL(32) >> PAGE_SHIFT)); > - if (!data->plat_data->has_4gb_mode) > - data->enable_4GB = false; > + data->enable_4GB = false; > + if (data->plat_data->has_4gb_mode) { > + infracfg = syscon_regmap_lookup_by_compatible( > + "mediatek,mt8173-infracfg"); > + if (IS_ERR(infracfg)) { > + infracfg = syscon_regmap_lookup_by_compatible( > + "mediatek,mt2712-infracfg"); > + if (IS_ERR(infracfg)) > + return PTR_ERR(infracfg); > + > + } > + ret = regmap_read(infracfg, REG_INFRA_MISC, &val); > + if (ret) > + return ret; > + data->enable_4GB = !!(val & F_DDR_4GB_SUPPORT_EN); (I am absolutely not familiar with syscon_regmap_lookup_by ..., I am missing some context, so sorry for the stupid questions) Who sets the regmap value and based on what? Who decides that 4GB mode is supported or not? And who decides if 4GB mode is *required* or not? -- Thanks, David / dhildenb From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-11.3 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, NICE_REPLY_A,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_SANE_1 autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 124E1C433E3 for ; Tue, 21 Jul 2020 09:11:18 +0000 (UTC) Received: from whitealder.osuosl.org (smtp1.osuosl.org [140.211.166.138]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id D034120792 for ; Tue, 21 Jul 2020 09:11:17 +0000 (UTC) Authentication-Results: mail.kernel.org; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.9.0 MIME-Version: 1.0 In-Reply-To: <20200721021619.25575-1-miles.chen@mediatek.com> Content-Language: en-US X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 Cc: wsd_upstream@mediatek.com, linux-kernel@vger.kernel.org, Mike Rapoport , Chao Hao , iommu@lists.linux-foundation.org, linux-mediatek@lists.infradead.org, Yingjoe Chen , Christoph Hellwig , linux-arm-kernel@lists.infradead.org X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" On 21.07.20 04:16, Miles Chen wrote: > In previous discussion [1] and [2], we found that it is risky to > use max_pfn or totalram_pages to tell if 4GB mode is enabled. > > Check 4GB mode by reading infracfg register, remove the usage > of the un-exported symbol max_pfn. > > This is a step towards building mtk_iommu as a kernel module. > > Change since v1: > 1. remove the phandle usage, search for infracfg instead [3] > 2. use infracfg instead of infracfg_regmap > 3. move infracfg definitaions to linux/soc/mediatek/infracfg.h > 4. update enable_4GB only when has_4gb_mode Nit: We tend to place such information below the "---" (adding a second one) such that this information is discarded when the patch is picked up. > > [1] https://lkml.org/lkml/2020/6/3/733 > [2] https://lkml.org/lkml/2020/6/4/136 > [3] https://lkml.org/lkml/2020/7/15/1147 > > Cc: Mike Rapoport > Cc: David Hildenbrand > Cc: Yong Wu > Cc: Yingjoe Chen > Cc: Christoph Hellwig > Cc: Yong Wu > Cc: Chao Hao > Cc: Rob Herring > Cc: Matthias Brugger > Signed-off-by: Miles Chen > --- > drivers/iommu/mtk_iommu.c | 26 +++++++++++++++++++++----- > include/linux/soc/mediatek/infracfg.h | 3 +++ > 2 files changed, 24 insertions(+), 5 deletions(-) > > diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c > index 2be96f1cdbd2..16765f532853 100644 > --- a/drivers/iommu/mtk_iommu.c > +++ b/drivers/iommu/mtk_iommu.c > @@ -3,7 +3,6 @@ > * Copyright (c) 2015-2016 MediaTek Inc. > * Author: Yong Wu > */ > -#include > #include > #include > #include > @@ -15,13 +14,16 @@ > #include > #include > #include > +#include > #include > #include > #include > #include > #include > +#include > #include > #include > +#include > #include > #include > > @@ -599,8 +601,10 @@ static int mtk_iommu_probe(struct platform_device *pdev) > struct resource *res; > resource_size_t ioaddr; > struct component_match *match = NULL; > + struct regmap *infracfg; > void *protect; > int i, larb_nr, ret; > + u32 val; > > data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); > if (!data) > @@ -614,10 +618,22 @@ static int mtk_iommu_probe(struct platform_device *pdev) > return -ENOMEM; > data->protect_base = ALIGN(virt_to_phys(protect), MTK_PROTECT_PA_ALIGN); > > - /* Whether the current dram is over 4GB */ > - data->enable_4GB = !!(max_pfn > (BIT_ULL(32) >> PAGE_SHIFT)); > - if (!data->plat_data->has_4gb_mode) > - data->enable_4GB = false; > + data->enable_4GB = false; > + if (data->plat_data->has_4gb_mode) { > + infracfg = syscon_regmap_lookup_by_compatible( > + "mediatek,mt8173-infracfg"); > + if (IS_ERR(infracfg)) { > + infracfg = syscon_regmap_lookup_by_compatible( > + "mediatek,mt2712-infracfg"); > + if (IS_ERR(infracfg)) > + return PTR_ERR(infracfg); > + > + } > + ret = regmap_read(infracfg, REG_INFRA_MISC, &val); > + if (ret) > + return ret; > + data->enable_4GB = !!(val & F_DDR_4GB_SUPPORT_EN); (I am absolutely not familiar with syscon_regmap_lookup_by ..., I am missing some context, so sorry for the stupid questions) Who sets the regmap value and based on what? Who decides that 4GB mode is supported or not? And who decides if 4GB mode is *required* or not? -- Thanks, David / dhildenb _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-11.5 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,NICE_REPLY_A,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 188AAC433DF for ; Tue, 21 Jul 2020 09:11:34 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id DAC0A20792 for ; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.9.0 MIME-Version: 1.0 In-Reply-To: <20200721021619.25575-1-miles.chen@mediatek.com> Content-Language: en-US X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200721_051113_059869_472391BE X-CRM114-Status: GOOD ( 25.84 ) X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: wsd_upstream@mediatek.com, linux-kernel@vger.kernel.org, Mike Rapoport , Chao Hao , iommu@lists.linux-foundation.org, linux-mediatek@lists.infradead.org, Yong Wu , Yingjoe Chen , Christoph Hellwig , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org On 21.07.20 04:16, Miles Chen wrote: > In previous discussion [1] and [2], we found that it is risky to > use max_pfn or totalram_pages to tell if 4GB mode is enabled. > > Check 4GB mode by reading infracfg register, remove the usage > of the un-exported symbol max_pfn. > > This is a step towards building mtk_iommu as a kernel module. > > Change since v1: > 1. remove the phandle usage, search for infracfg instead [3] > 2. use infracfg instead of infracfg_regmap > 3. move infracfg definitaions to linux/soc/mediatek/infracfg.h > 4. update enable_4GB only when has_4gb_mode Nit: We tend to place such information below the "---" (adding a second one) such that this information is discarded when the patch is picked up. > > [1] https://lkml.org/lkml/2020/6/3/733 > [2] https://lkml.org/lkml/2020/6/4/136 > [3] https://lkml.org/lkml/2020/7/15/1147 > > Cc: Mike Rapoport > Cc: David Hildenbrand > Cc: Yong Wu > Cc: Yingjoe Chen > Cc: Christoph Hellwig > Cc: Yong Wu > Cc: Chao Hao > Cc: Rob Herring > Cc: Matthias Brugger > Signed-off-by: Miles Chen > --- > drivers/iommu/mtk_iommu.c | 26 +++++++++++++++++++++----- > include/linux/soc/mediatek/infracfg.h | 3 +++ > 2 files changed, 24 insertions(+), 5 deletions(-) > > diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c > index 2be96f1cdbd2..16765f532853 100644 > --- a/drivers/iommu/mtk_iommu.c > +++ b/drivers/iommu/mtk_iommu.c > @@ -3,7 +3,6 @@ > * Copyright (c) 2015-2016 MediaTek Inc. > * Author: Yong Wu > */ > -#include > #include > #include > #include > @@ -15,13 +14,16 @@ > #include > #include > #include > +#include > #include > #include > #include > #include > #include > +#include > #include > #include > +#include > #include > #include > > @@ -599,8 +601,10 @@ static int mtk_iommu_probe(struct platform_device *pdev) > struct resource *res; > resource_size_t ioaddr; > struct component_match *match = NULL; > + struct regmap *infracfg; > void *protect; > int i, larb_nr, ret; > + u32 val; > > data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); > if (!data) > @@ -614,10 +618,22 @@ static int mtk_iommu_probe(struct platform_device *pdev) > return -ENOMEM; > data->protect_base = ALIGN(virt_to_phys(protect), MTK_PROTECT_PA_ALIGN); > > - /* Whether the current dram is over 4GB */ > - data->enable_4GB = !!(max_pfn > (BIT_ULL(32) >> PAGE_SHIFT)); > - if (!data->plat_data->has_4gb_mode) > - data->enable_4GB = false; > + data->enable_4GB = false; > + if (data->plat_data->has_4gb_mode) { > + infracfg = syscon_regmap_lookup_by_compatible( > + "mediatek,mt8173-infracfg"); > + if (IS_ERR(infracfg)) { > + infracfg = syscon_regmap_lookup_by_compatible( > + "mediatek,mt2712-infracfg"); > + if (IS_ERR(infracfg)) > + return PTR_ERR(infracfg); > + > + } > + ret = regmap_read(infracfg, REG_INFRA_MISC, &val); > + if (ret) > + return ret; > + data->enable_4GB = !!(val & F_DDR_4GB_SUPPORT_EN); (I am absolutely not familiar with syscon_regmap_lookup_by ..., I am missing some context, so sorry for the stupid questions) Who sets the regmap value and based on what? Who decides that 4GB mode is supported or not? And who decides if 4GB mode is *required* or not? -- Thanks, David / dhildenb _______________________________________________ Linux-mediatek mailing list Linux-mediatek@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-mediatek From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-11.5 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,NICE_REPLY_A,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0F1BCC433DF for ; Tue, 21 Jul 2020 09:12:40 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id CF7F720792 for ; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.9.0 MIME-Version: 1.0 In-Reply-To: <20200721021619.25575-1-miles.chen@mediatek.com> Content-Language: en-US X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200721_051113_066357_DEBC77E5 X-CRM114-Status: GOOD ( 26.83 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: wsd_upstream@mediatek.com, linux-kernel@vger.kernel.org, Mike Rapoport , Chao Hao , iommu@lists.linux-foundation.org, linux-mediatek@lists.infradead.org, Yong Wu , Yingjoe Chen , Christoph Hellwig , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 21.07.20 04:16, Miles Chen wrote: > In previous discussion [1] and [2], we found that it is risky to > use max_pfn or totalram_pages to tell if 4GB mode is enabled. > > Check 4GB mode by reading infracfg register, remove the usage > of the un-exported symbol max_pfn. > > This is a step towards building mtk_iommu as a kernel module. > > Change since v1: > 1. remove the phandle usage, search for infracfg instead [3] > 2. use infracfg instead of infracfg_regmap > 3. move infracfg definitaions to linux/soc/mediatek/infracfg.h > 4. update enable_4GB only when has_4gb_mode Nit: We tend to place such information below the "---" (adding a second one) such that this information is discarded when the patch is picked up. > > [1] https://lkml.org/lkml/2020/6/3/733 > [2] https://lkml.org/lkml/2020/6/4/136 > [3] https://lkml.org/lkml/2020/7/15/1147 > > Cc: Mike Rapoport > Cc: David Hildenbrand > Cc: Yong Wu > Cc: Yingjoe Chen > Cc: Christoph Hellwig > Cc: Yong Wu > Cc: Chao Hao > Cc: Rob Herring > Cc: Matthias Brugger > Signed-off-by: Miles Chen > --- > drivers/iommu/mtk_iommu.c | 26 +++++++++++++++++++++----- > include/linux/soc/mediatek/infracfg.h | 3 +++ > 2 files changed, 24 insertions(+), 5 deletions(-) > > diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c > index 2be96f1cdbd2..16765f532853 100644 > --- a/drivers/iommu/mtk_iommu.c > +++ b/drivers/iommu/mtk_iommu.c > @@ -3,7 +3,6 @@ > * Copyright (c) 2015-2016 MediaTek Inc. > * Author: Yong Wu > */ > -#include > #include > #include > #include > @@ -15,13 +14,16 @@ > #include > #include > #include > +#include > #include > #include > #include > #include > #include > +#include > #include > #include > +#include > #include > #include > > @@ -599,8 +601,10 @@ static int mtk_iommu_probe(struct platform_device *pdev) > struct resource *res; > resource_size_t ioaddr; > struct component_match *match = NULL; > + struct regmap *infracfg; > void *protect; > int i, larb_nr, ret; > + u32 val; > > data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); > if (!data) > @@ -614,10 +618,22 @@ static int mtk_iommu_probe(struct platform_device *pdev) > return -ENOMEM; > data->protect_base = ALIGN(virt_to_phys(protect), MTK_PROTECT_PA_ALIGN); > > - /* Whether the current dram is over 4GB */ > - data->enable_4GB = !!(max_pfn > (BIT_ULL(32) >> PAGE_SHIFT)); > - if (!data->plat_data->has_4gb_mode) > - data->enable_4GB = false; > + data->enable_4GB = false; > + if (data->plat_data->has_4gb_mode) { > + infracfg = syscon_regmap_lookup_by_compatible( > + "mediatek,mt8173-infracfg"); > + if (IS_ERR(infracfg)) { > + infracfg = syscon_regmap_lookup_by_compatible( > + "mediatek,mt2712-infracfg"); > + if (IS_ERR(infracfg)) > + return PTR_ERR(infracfg); > + > + } > + ret = regmap_read(infracfg, REG_INFRA_MISC, &val); > + if (ret) > + return ret; > + data->enable_4GB = !!(val & F_DDR_4GB_SUPPORT_EN); (I am absolutely not familiar with syscon_regmap_lookup_by ..., I am missing some context, so sorry for the stupid questions) Who sets the regmap value and based on what? Who decides that 4GB mode is supported or not? And who decides if 4GB mode is *required* or not? -- Thanks, David / dhildenb _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel