[PATCH v5 1/5] PCI: designware: ensure ATU is enabled before IO/conf space accesses
pratyush.anand at gmail.com
Fri Dec 18 06:41:07 PST 2015
On Fri, Dec 18, 2015 at 6:08 PM, Stanimir Varbanov
<stanimir.varbanov at linaro.org> wrote:
> There is no guarantees that enabling ATU will hit the hardware
> immediately, and subsequent accesses to configuration / IO spaces
> are reliable. So fixing this by read back PCIE_ATU_CR2 register
> just after writing.
> Without such a fix the PCI device enumeration during kernel boot
> is not reliable, and reading configuration space for particular
> PCI device on the bus returns zero aka no device.
> Signed-off-by: Stanimir Varbanov <stanimir.varbanov at linaro.org>
Acked-by: Pratyush Anand <pratyush.anand at gmail.com>
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