linux-kernel - Re: [PATCH] PCI: dra7xx: program outbound atu with correct address

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Date:	Wed, 4 May 2016 10:44:09 +0530
From:	Kishon Vijay Abraham I <kishon@...com>
To:	Bjorn Helgaas <helgaas@...nel.org>,
	Niklas Cassel <niklas.cassel@...s.com>
CC:	<bhelgaas@...gle.com>, <jszhang@...vell.com>,
	<linux-omap@...r.kernel.org>, <linux-pci@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, Niklas Cassel <niklass@...s.com>
Subject: Re: [PATCH] PCI: dra7xx: program outbound atu with correct address



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@...s.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@...s.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@...com>

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