Hi, Às 11:29 PM de 12/19/2017, Niklas Cassel escreveu: > Previously, dw_pcie_ep_set_msi() wrote all bits in the Message Control > register, thus overwriting the PCI_MSI_FLAGS_64BIT bit. > By clearing the PCI_MSI_FLAGS_64BIT bit, we break MSI > on systems where the RC has set a 64 bit MSI address. > Fix dw_pcie_ep_set_msi() so that it only sets MMC bits. > > Signed-off-by: Niklas Cassel <niklas.cas...@axis.com> > --- > drivers/pci/dwc/pcie-designware-ep.c | 4 +++- > drivers/pci/dwc/pcie-designware.h | 1 + > 2 files changed, 4 insertions(+), 1 deletion(-) > > diff --git a/drivers/pci/dwc/pcie-designware-ep.c > b/drivers/pci/dwc/pcie-designware-ep.c > index d53d5f168363..c92ab87fd660 100644 > --- a/drivers/pci/dwc/pcie-designware-ep.c > +++ b/drivers/pci/dwc/pcie-designware-ep.c > @@ -220,7 +220,9 @@ static int dw_pcie_ep_set_msi(struct pci_epc *epc, u8 > encode_int) > struct dw_pcie_ep *ep = epc_get_drvdata(epc); > struct dw_pcie *pci = to_dw_pcie_from_ep(ep); > > - val = (encode_int << MSI_CAP_MMC_SHIFT); > + val = dw_pcie_readw_dbi(pci, MSI_MESSAGE_CONTROL); > + val &= ~MSI_CAP_MMC_MASK; > + val |= (encode_int << MSI_CAP_MMC_SHIFT) & MSI_CAP_MMC_MASK; > dw_pcie_writew_dbi(pci, MSI_MESSAGE_CONTROL, val); > > return 0; > diff --git a/drivers/pci/dwc/pcie-designware.h > b/drivers/pci/dwc/pcie-designware.h > index ecdede68522a..9aaf0cd04dd6 100644 > --- a/drivers/pci/dwc/pcie-designware.h > +++ b/drivers/pci/dwc/pcie-designware.h > @@ -101,6 +101,7 @@ > > #define MSI_MESSAGE_CONTROL 0x52 > #define MSI_CAP_MMC_SHIFT 1 > +#define MSI_CAP_MMC_MASK (7 << MSI_CAP_MMC_SHIFT) > #define MSI_CAP_MME_SHIFT 4 > #define MSI_CAP_MME_MASK (7 << MSI_CAP_MME_SHIFT) > #define MSI_MESSAGE_ADDR_L32 0x54 >
Acked-by: Joao Pinto <jpi...@synopsys.com>
