linux-kernel - Aw: [PATCH] PCI: mediatek-gen3: handle PERST after reset

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Message-ID: <trinity-8c5502f4-34bc-456b-9e4b-37edac37c3ed-1682530907724@3c-app-gmx-bs05>
Date:   Wed, 26 Apr 2023 19:41:47 +0200
From:   Frank Wunderlich <frank-w@...lic-files.de>
To:     Frank Wunderlich <linux@...web.de>
Cc:     linux-mediatek@...ts.infradead.org,
        Ryder Lee <ryder.lee@...iatek.com>,
        Jianjun Wang <jianjun.wang@...iatek.com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Aw: [PATCH] PCI: mediatek-gen3: handle PERST after reset

Hi

> Gesendet: Sonntag, 02. April 2023 um 15:13 Uhr
> Von: "Frank Wunderlich" <linux@...web.de>
> De-assert PERST in separate step after reset signals to fully comply
> the PCIe CEM clause 2.2.
>
> This fixes some NVME detection issues on mt7986.
>
> Fixes: d3bf75b579b9 ("PCI: mediatek-gen3: Add MediaTek Gen3 driver for MT8192")
> Signed-off-by: Frank Wunderlich <frank-w@...lic-files.de>
> ---
> Patch is taken from user Ruslan aka RRKh61 (permitted me to send it
> with me as author).
>
> https://forum.banana-pi.org/t/bpi-r3-nvme-connection-issue/14563/17
> ---
>  drivers/pci/controller/pcie-mediatek-gen3.c | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/pci/controller/pcie-mediatek-gen3.c b/drivers/pci/controller/pcie-mediatek-gen3.c
> index b8612ce5f4d0..176b1a04565d 100644
> --- a/drivers/pci/controller/pcie-mediatek-gen3.c
> +++ b/drivers/pci/controller/pcie-mediatek-gen3.c
> @@ -350,7 +350,13 @@ static int mtk_pcie_startup_port(struct mtk_gen3_pcie *pcie)
>  	msleep(100);
>
>  	/* De-assert reset signals */
> -	val &= ~(PCIE_MAC_RSTB | PCIE_PHY_RSTB | PCIE_BRG_RSTB | PCIE_PE_RSTB);
> +	val &= ~(PCIE_MAC_RSTB | PCIE_PHY_RSTB | PCIE_BRG_RSTB);
> +	writel_relaxed(val, pcie->base + PCIE_RST_CTRL_REG);
> +
> +	msleep(100);
> +
> +	/* De-assert PERST# signals */
> +	val &= ~(PCIE_PE_RSTB);
>  	writel_relaxed(val, pcie->base + PCIE_RST_CTRL_REG);
>
>  	/* Check if the link is up or not */

Hi

just a friendly reminder....do i miss any recipient?

regards Frank