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From: Matthias Brugger <matthias.bgg@gmail.com>
To: Yong Wu <yong.wu@mediatek.com>, Joerg Roedel <joro@8bytes.org>,
	Robin Murphy <robin.murphy@arm.com>,
	Rob Herring <robh+dt@kernel.org>
Cc: youlin.pei@mediatek.com, devicetree@vger.kernel.org,
	Nicolas Boichat <drinkcat@chromium.org>,
	srv_heupstream@mediatek.com, Will Deacon <will.deacon@arm.com>,
	linux-kernel@vger.kernel.org, Evan Green <evgreen@chromium.org>,
	Tomasz Figa <tfiga@google.com>,
	iommu@lists.linux-foundation.org,
	Matthias Kaehlcke <mka@chromium.org>,
	linux-mediatek@lists.infradead.org, yingjoe.chen@mediatek.com,
	anan.sun@mediatek.com, linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v7 19/21] iommu/mediatek: Rename enable_4GB to dram_is_4gb
Date: Tue, 18 Jun 2019 18:06:47 +0200
Message-ID: <9bf13c22-0c73-2950-2204-23d577976b03@gmail.com> (raw)
In-Reply-To: <1560169080-27134-20-git-send-email-yong.wu@mediatek.com>



On 10/06/2019 14:17, Yong Wu wrote:
> This patch only rename the variable name from enable_4GB to
> dram_is_4gb for readable.

From my understanding this is true when available RAM > 4GB so I think the name
should be something like dram_bigger_4gb otherwise it may create confusion again.

Also from my point of view this patch should be done before
"[PATCH 06/21] iommu/io-pgtable-arm-v7s: Extend MediaTek 4GB Mode"

Regards,
Matthias

> 
> Signed-off-by: Yong Wu <yong.wu@mediatek.com>
> Reviewed-by: Evan Green <evgreen@chromium.org>
> ---
>  drivers/iommu/mtk_iommu.c | 10 +++++-----
>  drivers/iommu/mtk_iommu.h |  2 +-
>  2 files changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
> index 86158d8..67cab2d 100644
> --- a/drivers/iommu/mtk_iommu.c
> +++ b/drivers/iommu/mtk_iommu.c
> @@ -382,7 +382,7 @@ static int mtk_iommu_map(struct iommu_domain *domain, unsigned long iova,
>  	int ret;
>  
>  	/* The "4GB mode" M4U physically can not use the lower remap of Dram. */
> -	if (data->plat_data->has_4gb_mode && data->enable_4GB)
> +	if (data->plat_data->has_4gb_mode && data->dram_is_4gb)
>  		paddr |= BIT_ULL(32);
>  
>  	spin_lock_irqsave(&dom->pgtlock, flags);
> @@ -554,13 +554,13 @@ static int mtk_iommu_hw_init(const struct mtk_iommu_data *data)
>  	writel_relaxed(regval, data->base + REG_MMU_INT_MAIN_CONTROL);
>  
>  	if (data->plat_data->m4u_plat == M4U_MT8173)
> -		regval = (data->protect_base >> 1) | (data->enable_4GB << 31);
> +		regval = (data->protect_base >> 1) | (data->dram_is_4gb << 31);
>  	else
>  		regval = lower_32_bits(data->protect_base) |
>  			 upper_32_bits(data->protect_base);
>  	writel_relaxed(regval, data->base + REG_MMU_IVRP_PADDR);
>  
> -	if (data->enable_4GB && data->plat_data->has_vld_pa_rng) {
> +	if (data->dram_is_4gb && data->plat_data->has_vld_pa_rng) {
>  		/*
>  		 * If 4GB mode is enabled, the validate PA range is from
>  		 * 0x1_0000_0000 to 0x1_ffff_ffff. here record bit[32:30].
> @@ -611,8 +611,8 @@ 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));
> +	/* Whether the current dram is 4GB. */
> +	data->dram_is_4gb = !!(max_pfn > (BIT_ULL(32) >> PAGE_SHIFT));
>  
>  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>  	data->base = devm_ioremap_resource(dev, res);
> diff --git a/drivers/iommu/mtk_iommu.h b/drivers/iommu/mtk_iommu.h
> index 753266b..e8114b2 100644
> --- a/drivers/iommu/mtk_iommu.h
> +++ b/drivers/iommu/mtk_iommu.h
> @@ -65,7 +65,7 @@ struct mtk_iommu_data {
>  	struct mtk_iommu_domain		*m4u_dom;
>  	struct iommu_group		*m4u_group;
>  	struct mtk_smi_iommu		smi_imu;      /* SMI larb iommu info */
> -	bool                            enable_4GB;
> +	bool                            dram_is_4gb;
>  	bool				tlb_flush_active;
>  
>  	struct iommu_device		iommu;
> 
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  reply index

Thread overview: 53+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-10 12:17 [PATCH v7 00/21] MT8183 IOMMU SUPPORT Yong Wu
2019-06-10 12:17 ` [PATCH v7 01/21] dt-bindings: mediatek: Add binding for mt8183 IOMMU and SMI Yong Wu
2019-06-10 12:17 ` [PATCH v7 02/21] iommu/mediatek: Use a struct as the platform data Yong Wu
2019-06-10 12:17 ` [PATCH v7 03/21] memory: mtk-smi: Use a general config_port interface Yong Wu
2019-06-10 12:17 ` [PATCH v7 04/21] memory: mtk-smi: Use a struct for the platform data for smi-common Yong Wu
2019-06-10 12:17 ` [PATCH v7 05/21] iommu/io-pgtable-arm-v7s: Add paddr_to_iopte and iopte_to_paddr helpers Yong Wu
2019-06-10 12:17 ` [PATCH v7 06/21] iommu/io-pgtable-arm-v7s: Extend MediaTek 4GB Mode Yong Wu
2019-06-10 12:17 ` [PATCH v7 07/21] iommu/mediatek: Add bclk can be supported optionally Yong Wu
2019-06-15 19:18   ` Matthias Brugger
2019-06-10 12:17 ` [PATCH v7 08/21] iommu/mediatek: Add larb-id remapped support Yong Wu
2019-06-17  9:25   ` Matthias Brugger
2019-06-10 12:17 ` [PATCH v7 09/21] iommu/mediatek: Refine protect memory definition Yong Wu
2019-06-17  9:59   ` Matthias Brugger
2019-06-10 12:17 ` [PATCH v7 10/21] iommu/mediatek: Move reset_axi into plat_data Yong Wu
2019-06-17 10:19   ` Matthias Brugger
2019-06-10 12:17 ` [PATCH v7 11/21] iommu/mediatek: Move vld_pa_rng " Yong Wu
2019-06-17 10:27   ` Matthias Brugger
2019-06-10 12:17 ` [PATCH v7 12/21] memory: mtk-smi: Add gals support Yong Wu
2019-06-17 15:43   ` Matthias Brugger
2019-06-10 12:17 ` [PATCH v7 13/21] iommu/mediatek: Add mt8183 IOMMU support Yong Wu
2019-06-17 15:51   ` Matthias Brugger
2019-06-10 12:17 ` [PATCH v7 14/21] iommu/mediatek: Add mmu1 support Yong Wu
2019-06-17 15:58   ` Matthias Brugger
2019-06-18  6:19   ` Tomasz Figa via iommu
2019-06-18 12:09     ` Yong Wu
2019-06-18 14:05       ` Tomasz Figa via iommu
2019-06-10 12:17 ` [PATCH v7 15/21] memory: mtk-smi: Invoke pm runtime_callback to enable clocks Yong Wu
2019-06-17 16:13   ` Matthias Brugger
2019-06-10 12:17 ` [PATCH v7 16/21] memory: mtk-smi: Add bus_sel for mt8183 Yong Wu
2019-06-13  8:14   ` Pi-Hsun Shih
2019-06-20  9:35     ` Matthias Brugger
2019-06-20 11:38       ` Matthias Brugger
2019-06-21  3:57         ` Pi-Hsun Shih
2019-06-13  8:20   ` Pi-Hsun Shih
2019-06-17 16:28     ` Matthias Brugger
2019-06-17 16:23   ` Matthias Brugger
2019-06-18 12:10     ` Yong Wu
2019-06-18 21:07       ` Matthias Brugger
2019-06-10 12:17 ` [PATCH v7 17/21] memory: mtk-smi: Get rid of need_larbid Yong Wu
2019-06-18 13:45   ` Matthias Brugger
2019-06-20 13:59     ` Yong Wu
2019-06-10 12:17 ` [PATCH v7 18/21] iommu/mediatek: Fix VLD_PA_RNG register backup when suspend Yong Wu
2019-06-17 16:30   ` Matthias Brugger
2019-06-10 12:17 ` [PATCH v7 19/21] iommu/mediatek: Rename enable_4GB to dram_is_4gb Yong Wu
2019-06-18 16:06   ` Matthias Brugger [this message]
2019-06-20 13:59     ` Yong Wu
2019-06-21 10:10       ` Matthias Brugger
2019-06-22  2:42         ` Yong Wu
2019-06-10 12:17 ` [PATCH v7 20/21] iommu/mediatek: Fix iova_to_phys PA start for 4GB mode Yong Wu
2019-06-18 16:35   ` Matthias Brugger
2019-06-20 14:00     ` Yong Wu
2019-06-10 12:18 ` [PATCH v7 21/21] iommu/mediatek: Switch to SPDX license identifier Yong Wu
2019-06-17 16:33   ` Matthias Brugger

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