tree 8a4c623a5502b3d110dc135502033b8775b3630d
parent c8947fbbd19cc05078af3b1f3e9420d5dacd40ea
author Gabriele Paoloni <gabriele.paoloni@huawei.com> 1444332458 -0500
committer Bjorn Helgaas <bhelgaas@google.com> 1446497316 -0600

PCI: spear: Fix dw_pcie_cfg_read/write() usage

The first argument of dw_pcie_cfg_read/write() is a 32-bit aligned address.
The second argument is the byte offset into a 32-bit word, and
dw_pcie_cfg_read/write() only look at the low two bits.

SPEAr13xx used dw_pcie_cfg_read() and dw_pcie_cfg_write() incorrectly: it
passed important address bits in the second argument, where they were
ignored.

Pass the complete 32-bit word address in the first argument and only the
2-bit offset into that word in the second argument.

Without this fix, SPEAr13xx host will never work with few buggy gen1 card
which connects with only gen1 host and also with any endpoint which would
generate a read request of more than 128 bytes.

[bhelgaas: changelog]
Reported-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Pratyush Anand <panand@redhat.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
CC: stable@vger.kernel.org	# v3.17+