Fix i.MX8MP PCIe EP can't trigger MSI issue.
There is one 64Kbytes minimal requirement on i.MX8M PCIe outbound
region configuration.

EP uses Bar0 to set the outboud region to configure the MSI setting.
Set the page_size to "epc_features->align" to meet the requirement,
let the MSI can be triggered successfully.

Fixes: 1bd0d43dcf3b ("PCI: imx6: Clean up addr_space retrieval code")
Signed-off-by: Richard Zhu <hongxing.zhu@nxp.com>
Reviewed-by: Frank Li <frank.li@nxp.com>
Acked-by: Jason Liu <jason.hui.liu@nxp.com>
---
 drivers/pci/controller/dwc/pci-imx6.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
index 99a60270b26c..3238b63721bc 100644
--- a/drivers/pci/controller/dwc/pci-imx6.c
+++ b/drivers/pci/controller/dwc/pci-imx6.c
@@ -1013,9 +1013,14 @@ static void imx6_pcie_ep_init(struct dw_pcie_ep *ep)
 {
 	enum pci_barno bar;
 	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
+	const struct pci_epc_features *epc_features;
 
 	for (bar = BAR_0; bar <= BAR_5; bar++)
 		dw_pcie_ep_reset_bar(pci, bar);
+	if (ep->ops->get_features) {
+		epc_features = ep->ops->get_features(ep);
+		ep->page_size = epc_features->align;
+	}
 }
 
 static int imx6_pcie_ep_raise_irq(struct dw_pcie_ep *ep, u8 func_no,
-- 
2.37.1

On Wed, Mar 20, 2024 at 11:45:38AM +0800, Richard Zhu wrote:
> Fix i.MX8MP PCIe EP can't trigger MSI issue.
> There is one 64Kbytes minimal requirement on i.MX8M PCIe outbound
> region configuration.
> 
> EP uses Bar0 to set the outboud region to configure the MSI setting.
> Set the page_size to "epc_features->align" to meet the requirement,
> let the MSI can be triggered successfully.
> 
> Fixes: 1bd0d43dcf3b ("PCI: imx6: Clean up addr_space retrieval code")
> Signed-off-by: Richard Zhu <hongxing.zhu@nxp.com>
> Reviewed-by: Frank Li <frank.li@nxp.com>
> Acked-by: Jason Liu <jason.hui.liu@nxp.com>
> ---
>  drivers/pci/controller/dwc/pci-imx6.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
> index 99a60270b26c..3238b63721bc 100644
> --- a/drivers/pci/controller/dwc/pci-imx6.c
> +++ b/drivers/pci/controller/dwc/pci-imx6.c
> @@ -1013,9 +1013,14 @@ static void imx6_pcie_ep_init(struct dw_pcie_ep *ep)
>  {
>  	enum pci_barno bar;
>  	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
> +	const struct pci_epc_features *epc_features;
>  
>  	for (bar = BAR_0; bar <= BAR_5; bar++)
>  		dw_pcie_ep_reset_bar(pci, bar);
> +	if (ep->ops->get_features) {
> +		epc_features = ep->ops->get_features(ep);
> +		ep->page_size = epc_features->align;
> +	}

I suggest in imx6_add_pcie_ep()

	ep->page_size = imx_pcie->drvdata->epc_features->aglgin;

	it should be set before call dw_pcie_ep_init().

If you like, I can add this fixed to my patch serial to avoid conflict
https://lore.kernel.org/linux-pci/Zfm720fz9NE0fD%2FP@lizhi-Precision-Tower-5810/T/#t

Frank
 
>  }
>  
>  static int imx6_pcie_ep_raise_irq(struct dw_pcie_ep *ep, u8 func_no,
> -- 
> 2.37.1
>