linux-kernel - Re: [PATCH v4 08/11] PCI: rockchip: Fix window mapping and address translation for endpoint

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Message-ID: <85495f58-34f5-70b4-7536-ccab49bfa0ca@kernel.org>
Date:   Tue, 18 Apr 2023 08:55:53 +0900
From:   Damien Le Moal <dlemoal@...nel.org>
To:     Rick Wertenbroek <rick.wertenbroek@...il.com>,
        alberto.dassatti@...g-vd.ch
Cc:     xxm@...k-chips.com, stable@...r.kernel.org,
        Shawn Lin <shawn.lin@...k-chips.com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Rob Herring <robh@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Heiko Stuebner <heiko@...ech.de>,
        Corentin Labbe <clabbe@...libre.com>,
        Brian Norris <briannorris@...omium.org>,
        Johan Jonker <jbx6244@...il.com>,
        Caleb Connolly <kc@...tmarketos.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Hugh Cole-Baker <sigmaris@...il.com>,
        Judy Hsiao <judyhsiao@...omium.org>,
        Arnaud Ferraris <arnaud.ferraris@...labora.com>,
        linux-pci@...r.kernel.org, linux-rockchip@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 08/11] PCI: rockchip: Fix window mapping and address
 translation for endpoint

On 4/17/23 18:26, Rick Wertenbroek wrote:
> The RK3399 PCI endpoint core has 33 windows for PCIe space, now in the
> driver up to 32 fixed size (1M) windows are used and pages are allocated
> and mapped accordingly. The driver first used a single window and allocated
> space inside which caused translation issues (between CPU space and PCI
> space) because a window can only have a single translation at a given
> time, which if multiple pages are allocated inside will cause conflicts.
> Now each window is a single region of 1M which will always guarantee that
> the translation is not in conflict.
> 
> Set the translation register addresses for physical function. As documented
> in the technical reference manual (TRM) section 17.5.5 "PCIe Address
> Translation" and section 17.6.8 "Address Translation Registers Description"
> 
> Fixes: cf590b078391 ("PCI: rockchip: Add EP driver for Rockchip PCIe controller")
> Cc: stable@...r.kernel.org
> Signed-off-by: Rick Wertenbroek <rick.wertenbroek@...il.com>
> Tested-by: Damien Le Moal <dlemoal@...nel.org>

[...]

> @@ -600,7 +582,8 @@ static int rockchip_pcie_ep_probe(struct platform_device *pdev)
>  
>  	ep->irq_pci_addr = ROCKCHIP_PCIE_EP_DUMMY_IRQ_ADDR;
>  
> -	rockchip_pcie_write(rockchip, PCIE_CLIENT_CONF_ENABLE, PCIE_CLIENT_CONFIG);
> +	rockchip_pcie_write(rockchip, PCIE_CLIENT_CONF_ENABLE,
> +			    PCIE_CLIENT_CONFIG);

This change belongs to patch 3 of the series, not here.

Other than this, looks good. With that fixed,

Reviewed-by: Damien Le Moal <dlemoal@...nel.org>