linux-kernel - Re: [PATCH v6 02/10] PCI: imx6: Fix i.MX8MP PCIe EP's occasional failure to trigger MSI

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Message-ID: <20240629130525.GC5608@thinkpad>
Date: Sat, 29 Jun 2024 18:35:25 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Frank Li <Frank.Li@....com>
Cc: Richard Zhu <hongxing.zhu@....com>,
	Lucas Stach <l.stach@...gutronix.de>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kw@...ux.com>,
	Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
	Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>,
	NXP Linux Team <linux-imx@....com>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>, linux-pci@...r.kernel.org,
	imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, bpf@...r.kernel.org,
	devicetree@...r.kernel.org, Jason Liu <jason.hui.liu@....com>
Subject: Re: [PATCH v6 02/10] PCI: imx6: Fix i.MX8MP PCIe EP's occasional
 failure to trigger MSI

On Mon, Jun 17, 2024 at 04:16:38PM -0400, Frank Li wrote:
> From: Richard Zhu <hongxing.zhu@....com>
> 
> Correct occasional MSI triggering failures in i.MX8MP PCIe EP by apply 64KB
> hardware alignment requirement.
> 
> MSI triggering fail if the outbound MSI memory region (ep->msi_mem) is not
> aligned to 64KB.
> 
> In dw_pcie_ep_init():
> 
> ep->msi_mem = pci_epc_mem_alloc_addr(epc, &ep->msi_mem_phys,
> 				     epc->mem->window.page_size);
> 

So this is an alignment restriction w.r.t iATU. In that case, we should be
passing 'pci_epc_features::align' instead?

- Mani

> Set ep->page_size to match drvdata::epc_features::align since different
> SOCs have different alignment requirements.
> 
> Fixes: 1bd0d43dcf3b ("PCI: imx6: Clean up addr_space retrieval code")
> Signed-off-by: Richard Zhu <hongxing.zhu@....com>
> Acked-by: Jason Liu <jason.hui.liu@....com>
> Signed-off-by: Frank Li <Frank.Li@....com>
> ---
>  drivers/pci/controller/dwc/pci-imx6.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
> index 9a71b8aa09b3c..ca9a000c9a96d 100644
> --- a/drivers/pci/controller/dwc/pci-imx6.c
> +++ b/drivers/pci/controller/dwc/pci-imx6.c
> @@ -1118,6 +1118,8 @@ static int imx6_add_pcie_ep(struct imx6_pcie *imx6_pcie,
>  	if (imx6_check_flag(imx6_pcie, IMX6_PCIE_FLAG_SUPPORT_64BIT))
>  		dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64));
>  
> +	ep->page_size = imx6_pcie->drvdata->epc_features->align;
> +
>  	ret = dw_pcie_ep_init(ep);
>  	if (ret) {
>  		dev_err(dev, "failed to initialize endpoint\n");
> 
> -- 
> 2.34.1
> 

-- 
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