[PATCH 5/9] pci_ep: layerscape: Add the workaround for errata A-009460

[Z.q. Hou]

> -----Original Message-----
> From: Xiaowei Bao <xiaowei.bao at nxp.com>
> Sent: 2020年3月22日 19:13
> To: M.h. Lian <minghuan.lian at nxp.com>; Z.q. Hou
> <zhiqiang.hou at nxp.com>; Mingkai Hu <mingkai.hu at nxp.com>;
> bmeng.cn at gmail.com; yamada.masahiro at socionext.com;
> u-boot at lists.denx.de
> Cc: Xiaowei Bao <xiaowei.bao at nxp.com>
> Subject: [PATCH 5/9] pci_ep: layerscape: Add the workaround for errata
> A-009460
> 
> The VF_BARn_REG register's Prefetchable and Type bit fields are overwritten
> by a write to VF's BAR Mask register.
> workaround: Before writing to the VF_BARn_MASK_REG register, write 0b to
> the PCIE_MISC_CONTROL_1_OFF register.
> 
> Signed-off-by: Xiaowei Bao <xiaowei.bao at nxp.com>
> ---
>  drivers/pci/pcie_layerscape_ep.c | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/drivers/pci/pcie_layerscape_ep.c
> b/drivers/pci/pcie_layerscape_ep.c
> index bec374b..a2b18ad 100644
> --- a/drivers/pci/pcie_layerscape_ep.c
> +++ b/drivers/pci/pcie_layerscape_ep.c
> @@ -163,6 +163,15 @@ static void ls_pcie_setup_ep(struct ls_pcie_ep
> *pcie_ep)
>  	if (PCI_EXT_CAP_ID(sriov) == PCI_EXT_CAP_ID_SRIOV) {
>  		pcie_ep->sriov_flag = 1;
>  		for (pf = 0; pf < PCIE_PF_NUM; pf++) {
> +			/*
> +			 * The VF_BARn_REG register's Prefetchable and Type bit
> +			 * fields are overwritten by a write to VF's BAR Mask
> +			 * register. Before writing to the VF_BARn_MASK_REG
> +			 * register, write 0b to the PCIE_MISC_CONTROL_1_OFF
> +			 * register.
> +			 */
> +			writel(0, pcie->dbi + PCIE_MISC_CONTROL_1_OFF);
> +
>  			if (pcie_ep->cfg2_flag) {
>  				for (vf = 0; vf <= PCIE_VF_NUM; vf++) {
>  					ctrl_writel(pcie,
> --
> 2.9.5
Reviewed-by: Hou Zhiqiang <Zhiqiang.Hou at nxp.com>