Re: [PATCH v4 3/5] PCI: designware-ep: Make dw_pcie_ep_reset_bar() handle 64-bit BARs properly

[Kishon Vijay Abraham I]

Hi Niklas,

On Thursday 08 March 2018 07:03 PM, Niklas Cassel wrote:
> Since a 64-bit BAR consists of a BAR pair, we need to write to both
> BARs in the BAR pair to clear the BAR properly.
> 
> Signed-off-by: Niklas Cassel <niklas.cassel@xxxxxxxx>
> ---
>  drivers/pci/dwc/pcie-designware-ep.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/drivers/pci/dwc/pcie-designware-ep.c b/drivers/pci/dwc/pcie-designware-ep.c
> index 946bbdf53c4d..b20b2651caf9 100644
> --- a/drivers/pci/dwc/pcie-designware-ep.c
> +++ b/drivers/pci/dwc/pcie-designware-ep.c
> @@ -22,11 +22,18 @@ void dw_pcie_ep_linkup(struct dw_pcie_ep *ep)
>  void dw_pcie_ep_reset_bar(struct dw_pcie *pci, enum pci_barno bar)
>  {
>  	u32 reg;
> +	u32 val;
>  
>  	reg = PCI_BASE_ADDRESS_0 + (4 * bar);
> +	val = dw_pcie_readl_dbi(pci, reg);
>  	dw_pcie_dbi_ro_wr_en(pci);
>  	dw_pcie_writel_dbi2(pci, reg, 0x0);
>  	dw_pcie_writel_dbi(pci, reg, 0x0);
> +	if (!(val & PCI_BASE_ADDRESS_SPACE_IO) &&
> +	    (val & PCI_BASE_ADDRESS_MEM_TYPE_64)) {
> +		dw_pcie_writel_dbi2(pci, reg + 4, 0x0);
> +		dw_pcie_writel_dbi(pci, reg + 4, 0x0);
> +	}

same comment as previous patch apply here too.

Thanks
Kishon