PCI: altera: Fix TLP_CFG_DW0 for TLP write

eb5767122feb ("PCI: altera: Simplify TLB_CFG_DW0 usage") used
TLP_FMTTYPE_CFGRD* (instead of TLP_FMTTYPE_CFGWR*) for TLP writes, which
causes writing to configuration space to fail.  Fix it by using correct
FMTTYPE for write operation.

Fixes: eb5767122feb ("PCI: altera: Simplify TLB_CFG_DW0 usage")
Signed-off-by: Ley Foon Tan <ley.foon.tan@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
CC: stable@vger.kernel.org	# v4.9+

diff --git a/drivers/pci/host/pcie-altera.c b/drivers/pci/host/pcie-altera.c
index 5043b5f..75ec5ce 100644 (file)
--- a/drivers/pci/host/pcie-altera.c
+++ b/drivers/pci/host/pcie-altera.c
@@ -57,10 +57,14 @@
 #define TLP_WRITE_TAG                  0x10
 #define RP_DEVFN                       0
 #define TLP_REQ_ID(bus, devfn)         (((bus) << 8) | (devfn))
-#define TLP_CFG_DW0(pcie, bus)                                         \
+#define TLP_CFGRD_DW0(pcie, bus)                                       \
     ((((bus == pcie->root_bus_nr) ? TLP_FMTTYPE_CFGRD0                 \
                                    : TLP_FMTTYPE_CFGRD1) << 24) |      \
      TLP_PAYLOAD_SIZE)
+#define TLP_CFGWR_DW0(pcie, bus)                                       \
+    ((((bus == pcie->root_bus_nr) ? TLP_FMTTYPE_CFGWR0                 \
+                                   : TLP_FMTTYPE_CFGWR1) << 24) |      \
+     TLP_PAYLOAD_SIZE)
 #define TLP_CFG_DW1(pcie, tag, be)     \
     (((TLP_REQ_ID(pcie->root_bus_nr,  RP_DEVFN)) << 16) | (tag << 8) | (be))
 #define TLP_CFG_DW2(bus, devfn, offset)        \
@@ -222,7 +226,7 @@ static int tlp_cfg_dword_read(struct altera_pcie *pcie, u8 bus, u32 devfn,
 {
        u32 headers[TLP_HDR_SIZE];
 
-       headers[0] = TLP_CFG_DW0(pcie, bus);
+       headers[0] = TLP_CFGRD_DW0(pcie, bus);
        headers[1] = TLP_CFG_DW1(pcie, TLP_READ_TAG, byte_en);
        headers[2] = TLP_CFG_DW2(bus, devfn, where);
 
@@ -237,7 +241,7 @@ static int tlp_cfg_dword_write(struct altera_pcie *pcie, u8 bus, u32 devfn,
        u32 headers[TLP_HDR_SIZE];
        int ret;
 
-       headers[0] = TLP_CFG_DW0(pcie, bus);
+       headers[0] = TLP_CFGWR_DW0(pcie, bus);
        headers[1] = TLP_CFG_DW1(pcie, TLP_WRITE_TAG, byte_en);
        headers[2] = TLP_CFG_DW2(bus, devfn, where);