Commit c003ca99 authored by Gabriele Paoloni's avatar Gabriele Paoloni Committed by Bjorn Helgaas

PCI: designware: Use exact access size in dw_pcie_cfg_read()

dw_pcie_cfg_write() uses the exact 8-, 16-, or 32-bit access size
requested, but dw_pcie_cfg_read() previously performed a 32-bit read and
masked out the bits requested.

Use the exact access size in dw_pcie_cfg_read().  For example, if we want
an 8-bit read, use readb() instead of using readl() and masking out the 8
bits we need.  This makes it symmetric with dw_pcie_cfg_write().

[bhelgaas: split into separate patch, set *val = 0 in failure case]
Signed-off-by: default avatarGabriele Paoloni <gabriele.paoloni@huawei.com>
Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
parent fa3b7cba
......@@ -82,14 +82,16 @@ static inline struct pcie_port *sys_to_pcie(struct pci_sys_data *sys)
int dw_pcie_cfg_read(void __iomem *addr, int where, int size, u32 *val)
{
if (size == 4)
*val = readl(addr);
if (size == 1)
*val = (*val >> (8 * (where & 3))) & 0xff;
else if (size == 2)
*val = (*val >> (8 * (where & 3))) & 0xffff;
else if (size != 4)
*val = readw(addr + (where & 2));
else if (size == 1)
*val = readb(addr + (where & 1));
else {
*val = 0;
return PCIBIOS_BAD_REGISTER_NUMBER;
}
return PCIBIOS_SUCCESSFUL;
}
......
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