diff options
| author | Niklas Cassel <niklas.cassel@axis.com> | 2017-12-20 00:29:23 +0100 |
|---|---|---|
| committer | Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> | 2017-12-21 12:09:24 +0100 |
| commit | 099a95f3591ade29da52131895a3ba9f92a0e82c (patch) | |
| tree | a6c00c76e3d218edd8545e30c8587b82c1915b19 /drivers/pci/dwc | |
| parent | PCI: dwc: Use the DMA-API to get the MSI address (diff) | |
| download | linux-099a95f3591ade29da52131895a3ba9f92a0e82c.tar.xz linux-099a95f3591ade29da52131895a3ba9f92a0e82c.zip | |
PCI: designware-ep: dw_pcie_ep_set_msi() should only set MMC bits
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.
Tested-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Signed-off-by: Niklas Cassel <niklas.cassel@axis.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Joao Pinto <jpinto@synopsys.com>
Diffstat (limited to 'drivers/pci/dwc')
| -rw-r--r-- | drivers/pci/dwc/pcie-designware-ep.c | 4 | ||||
| -rw-r--r-- | drivers/pci/dwc/pcie-designware.h | 1 |
2 files changed, 4 insertions, 1 deletions
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 |