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Message-ID: <1a689435-c336-ff81-a231-4c17e19fa2f5@rock-chips.com>
Date:   Wed, 31 Aug 2016 08:58:43 +0800
From:   Shawn Lin <shawn.lin@...k-chips.com>
To:     Bjorn Helgaas <helgaas@...nel.org>,
        Brian Norris <briannorris@...omium.org>
Cc:     shawn.lin@...k-chips.com, Bjorn Helgaas <bhelgaas@...gle.com>,
        linux-kernel@...r.kernel.org,
        Brian Norris <computersforpeace@...il.com>,
        Wenrui Li <wenrui.li@...k-chips.com>,
        Heiko Stuebner <heiko@...ech.de>, linux-pci@...r.kernel.org,
        linux-rockchip@...ts.infradead.org
Subject: Re: [PATCH] PCI: rockchip: Correct the register value for clearing
 client interrupts

On 2016/8/30 7:57, Bjorn Helgaas wrote:
> On Mon, Aug 29, 2016 at 02:14:11PM -0700, Brian Norris wrote:
>> I'm pretty sure the bitwise 'or' was meant for the value parameter, not
>> the register parameter.
>>
>> This resolves an interrupt storm, where if we receive any client IRQs
>> (e.g., correctable errors), we fail to ever clear them properly, so they
>> reoccur indefinitely.
>>
>> Fixes: 199410f6270e ("PCI: rockchip: Add Rockchip PCIe controller support")
>> Signed-off-by: Brian Norris <briannorris@...omium.org>
>> Cc: Shawn Lin <shawn.lin@...k-chips.com>
>
> Shawn, please confirm.  If this patch is correct, I'll fold it into
> the initial commit that adds the driver.

yes, Brian's patch is correct. I probably didn't notice this as
the client interrput on EVB-rev1 board which I was using is broken, so
my SSD didn't actually yelled at this irqstorm.


Brain, thanks for fixing this.

>
>> ---
>> Patched against git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git pci/host-rockchip
>>
>>  drivers/pci/host/pcie-rockchip.c | 7 ++++---
>>  1 file changed, 4 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/pci/host/pcie-rockchip.c b/drivers/pci/host/pcie-rockchip.c
>> index 8fb47ee9eaee..e77aec3cc869 100644
>> --- a/drivers/pci/host/pcie-rockchip.c
>> +++ b/drivers/pci/host/pcie-rockchip.c
>> @@ -689,9 +689,10 @@ static irqreturn_t rockchip_pcie_client_irq_handler(int irq, void *arg)
>>  			      PCIE_CLIENT_INT_MSG | PCIE_CLIENT_INT_HOT_RST |
>>  			      PCIE_CLIENT_INT_DPA | PCIE_CLIENT_INT_FATAL_ERR |
>>  			      PCIE_CLIENT_INT_NFATAL_ERR |
>> -			      PCIE_CLIENT_INT_CORR_ERR),
>> -			      PCIE_CLIENT_INT_STATUS |
>> -			      PCIE_CLIENT_INT_PHY);
>> +			      PCIE_CLIENT_INT_CORR_ERR |
>> +			      PCIE_CLIENT_INT_PHY),
>> +		   PCIE_CLIENT_INT_STATUS);
>> +
>>  	return IRQ_HANDLED;
>>  }
>>
>> --
>> 2.8.0.rc3.226.g39d4020
>>
>> --
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>


-- 
Best Regards
Shawn Lin