linux-kernel - Re: [PATCH v2] PCI: mediatek-gen3: Fix translation window

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Date:   Mon, 23 Oct 2023 14:32:17 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Jianjun Wang <jianjun.wang@...iatek.com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Rob Herring <robh@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Matthias Brugger <matthias.bgg@...il.com>
Cc:     Ryder Lee <ryder.lee@...iatek.com>, linux-pci@...r.kernel.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, jieyy.yang@...iatek.com,
        chuanjia.liu@...iatek.com, qizhong.cheng@...iatek.com,
        jian.yang@...iatek.com
Subject: Re: [PATCH v2] PCI: mediatek-gen3: Fix translation window

Il 23/10/23 10:14, Jianjun Wang ha scritto:
> The size of translation table should be a power of 2, using fls()
> cannot get the proper value when the size is not a power of 2. For
> example, fls(0x3e00000) - 1 = 25, hence the PCIe translation window
> size will be set to 0x2000000 instead of the expected size 0x3e00000.
> 
> Fix translation window by splitting the MMIO space to multiple tables if
> its size is not a power of 2.
> 
> Fixes: d3bf75b579b9 ("PCI: mediatek-gen3: Add MediaTek Gen3 driver for MT8192")
> Signed-off-by: Jianjun Wang <jianjun.wang@...iatek.com>
> 

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>