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SubjectRe: [PATCH] PCI: dra7xx: program outbound atu with correct address
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On Tuesday 03 May 2016 10:20 PM, Bjorn Helgaas wrote:
> On Mon, May 02, 2016 at 04:09:33PM -0500, Bjorn Helgaas wrote:
>> On Mon, May 02, 2016 at 04:54:40PM +0200, Niklas Cassel wrote:
>>> From: Niklas Cassel <niklas.cassel@axis.com>
>>>
>>> commit 1488aefa37a4 ("PCI: designware: Move Root Complex
>>> setup code to dw_pcie_setup_rc()") broke dra7xx
>>> by moving code from dw_pcie_host_init to dw_pcie_setup_rc.
>>>
>>> Fix this by doing the cpu to bus calculation before calling
>>> dw_pcie_setup_rc.
>>>
>>> Fixes: 1488aefa37a4 ("PCI: designware: Move Root Complex setup code to dw_pcie_setup_rc()")
>>> Signed-off-by: Niklas Cassel <niklas.cassel@axis.com>
>>> ---
>>> drivers/pci/host/pci-dra7xx.c | 4 ++--
>>> 1 file changed, 2 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/drivers/pci/host/pci-dra7xx.c b/drivers/pci/host/pci-dra7xx.c
>>> index 2ca3a1f..f441130 100644
>>> --- a/drivers/pci/host/pci-dra7xx.c
>>> +++ b/drivers/pci/host/pci-dra7xx.c
>>> @@ -142,13 +142,13 @@ static void dra7xx_pcie_enable_interrupts(struct pcie_port *pp)
>>>
>>> static void dra7xx_pcie_host_init(struct pcie_port *pp)
>>> {
>>> - dw_pcie_setup_rc(pp);
>>> -
>>> pp->io_base &= DRA7XX_CPU_TO_BUS_ADDR;
>>> pp->mem_base &= DRA7XX_CPU_TO_BUS_ADDR;
>>> pp->cfg0_base &= DRA7XX_CPU_TO_BUS_ADDR;
>>> pp->cfg1_base &= DRA7XX_CPU_TO_BUS_ADDR;
>>>
>>> + dw_pcie_setup_rc(pp);
>>
>> This looks correct to me. Prior to 1488aefa37a4, we had this path,
>> which applied the dra7xx mem_base adjustment before programming the
>> outbound ATU:
>>
>> dra7xx_add_pcie_port
>> dw_pcie_host_init
>> pp->mem_base = pp->mem->start # <-- set pp->mem_base
>> ops->host_init
>> dra7xx_pcie_host_init # .host_init
>> dw_pcie_setup_rc
>> pp->mem_base &= DRA7XX_CPU_TO_BUS_ADDR # <-- update pp->mem_base
>> dw_pcie_prog_outbound_atu(pp->mem_base) # <-- use pp->mem_base
>>
>> After 1488aefa37a4, we have this:
>>
>> dra7xx_add_pcie_port
>> dw_pcie_host_init
>> pp->mem_base = pp->mem->start # <-- set pp->mem_base
>> ops->host_init
>> dra7xx_pcie_host_init # .host_init
>> dw_pcie_setup_rc
>> dw_pcie_prog_outbound_atu(pp->mem_base) # <-- use pp->mem_base
>> pp->mem_base &= DRA7XX_CPU_TO_BUS_ADDR # <-- update pp->mem_base
>>
>> So the dra7xx update is applied after we've already used it.
>>
>> If you agree, Kishon, I'll fold Niklas's fix into Jisheng's patch so
>> there's no bisection hole for dra7xx.
>
> I merged this (folded into Jisheng's patch on the pci/host-designware
> branch, and included in my "next" branch).
>
> Please let me know if it works for you, Niklas, or if you see any
> problems.

I did a basic ping test with a broadcom ethernet card and it worked fine.

Tested-by: Kishon Vijay Abraham I <kishon@ti.com>

>
>>> dra7xx_pcie_establish_link(pp);
>>> if (IS_ENABLED(CONFIG_PCI_MSI))
>>> dw_pcie_msi_init(pp);
>>> --
>>> 2.1.4
>>>
>>> --
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