[PATCH v3 8/9] PCI: rockchip-ep: Set a 64-bit BAR if requested

[Niklas Cassel]

On Fri, Apr 12, 2024 at 01:59:01PM -0500, Bjorn Helgaas wrote:
> On Wed, Mar 13, 2024 at 11:58:00AM +0100, Niklas Cassel wrote:
> > ...
> 
> > --- a/drivers/pci/controller/pcie-rockchip-ep.c
> > +++ b/drivers/pci/controller/pcie-rockchip-ep.c
> > @@ -153,7 +153,7 @@ static int rockchip_pcie_ep_set_bar(struct pci_epc *epc, u8 fn, u8 vfn,
> >  		ctrl = ROCKCHIP_PCIE_CORE_BAR_CFG_CTRL_IO_32BITS;
> >  	} else {
> >  		bool is_prefetch = !!(flags & PCI_BASE_ADDRESS_MEM_PREFETCH);
> > -		bool is_64bits = sz > SZ_2G;
> > +		bool is_64bits = !!(flags & PCI_BASE_ADDRESS_MEM_TYPE_64);
> >  
> >  		if (is_64bits && (bar & 1))
> >  			return -EINVAL;
> 
> Completely unrelated to *these* patches, but the BAR_CFG_CTRL
> definitions in both cadence and rockchip lead to some awkward case
> analysis:
> 
>   #define ROCKCHIP_PCIE_CORE_BAR_CFG_CTRL_MEM_32BITS              0x4
>   #define ROCKCHIP_PCIE_CORE_BAR_CFG_CTRL_PREFETCH_MEM_32BITS     0x5
>   #define ROCKCHIP_PCIE_CORE_BAR_CFG_CTRL_MEM_64BITS              0x6
>   #define ROCKCHIP_PCIE_CORE_BAR_CFG_CTRL_PREFETCH_MEM_64BITS     0x7
> 
>   if (is_64bits && is_prefetch)
>           ctrl = ROCKCHIP_PCIE_CORE_BAR_CFG_CTRL_PREFETCH_MEM_64BITS;
>   else if (is_prefetch)
>           ctrl = ROCKCHIP_PCIE_CORE_BAR_CFG_CTRL_PREFETCH_MEM_32BITS;
>   else if (is_64bits)
>           ctrl = ROCKCHIP_PCIE_CORE_BAR_CFG_CTRL_MEM_64BITS;
>   else
>           ctrl = ROCKCHIP_PCIE_CORE_BAR_CFG_CTRL_MEM_32BITS;
> 
> that *could* be just something like this:
> 
>   #define ROCKCHIP_PCIE_CORE_BAR_CFG_CTRL_MEM           0x4
>   #define ROCKCHIP_PCIE_CORE_BAR_CFG_CTRL_64BITS        0x2
>   #define ROCKCHIP_PCIE_CORE_BAR_CFG_CTRL_PREFETCH      0x1
> 
>   ctrl = ROCKCHIP_PCIE_CORE_BAR_CFG_CTRL_MEM;
>   if (is_64bits)
>     ctrl |= ROCKCHIP_PCIE_CORE_BAR_CFG_CTRL_64BITS;
>   if (is_prefetch)
>     ctrl |= ROCKCHIP_PCIE_CORE_BAR_CFG_CTRL_PREFETCH;


If you send the cleanup patches, I will send the Reviewed-by tags ;)


Kind regards,
Niklas