linux-kernel - Re: [v3] PCI: cadence: Fix sending message with data or without data

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Message-ID: <9ec0eab2-3320-45b2-8a65-7342de15f54d@163.com>
Date: Sat, 15 Feb 2025 00:49:59 +0800
From: Hans Zhang <18255117159@....com>
To: Manivannan Sadhasivam <mani@...nel.org>
Cc: lpieralisi@...nel.org, kw@...ux.com, manivannan.sadhasivam@...aro.org,
 robh@...nel.org, bhelgaas@...gle.com, bwawrzyn@...co.com, cassel@...nel.org,
 wojciech.jasko-EXT@...tinental-corporation.com, a-verma1@...com,
 linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org, rockswang7@...il.com
Subject: Re: [v3] PCI: cadence: Fix sending message with data or without data



On 2025/2/15 00:06, Manivannan Sadhasivam wrote:
> On Fri, Feb 07, 2025 at 06:39:23PM +0800, Hans Zhang wrote:
> 
> Subject should be changed as:
> 
> PCI: cadence-ep: Fix the driver to send MSG TLP for INTx without data payload

Okay.

>> View from cdns document cdn_pcie_gen4_hpa_axi_ips_ug_v1.04.pdf.
>> In section 9.1.7.1 AXI Subordinate to PCIe Address Translation
>> Registers below:
>>
>> axi_s_awaddr bits 16 is 1 for MSG with data and 0 for MSG without data.
>>
> 
> How about,
> 
> Cadence reference manual cdn_pcie_gen4_hpa_axi_ips_ug_v1.04.pdf, section
> 9.1.7.1 'AXI Subordinate to PCIe Address Translation' mentions that
> axi_s_awaddr bits 16 when set, corresponds to MSG with data and when not
> set, MSG without data.
> 
> But the driver is doing the opposite and due to this, INTx is never
> received on the host. So fix the driver to reflect the documentation and
> also make INTx work.

Thank you very much.

>> Signed-off-by: hans.zhang <18255117159@....com>
> 
> Please add the Fixes tag also.
> 

Okay.

> 
>> ---
>> Changes since v1-v2:
>> - Change email number and Signed-off-by
>> ---
>>   drivers/pci/controller/cadence/pcie-cadence-ep.c | 3 +--
>>   drivers/pci/controller/cadence/pcie-cadence.h    | 2 +-
>>   2 files changed, 2 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/pci/controller/cadence/pcie-cadence-ep.c b/drivers/pci/controller/cadence/pcie-cadence-ep.c
>> index e0cc4560dfde..0bf4cde34f51 100644
>> --- a/drivers/pci/controller/cadence/pcie-cadence-ep.c
>> +++ b/drivers/pci/controller/cadence/pcie-cadence-ep.c
>> @@ -352,8 +352,7 @@ static void cdns_pcie_ep_assert_intx(struct cdns_pcie_ep *ep, u8 fn, u8 intx,
>>   	spin_unlock_irqrestore(&ep->lock, flags);
>>   
>>   	offset = CDNS_PCIE_NORMAL_MSG_ROUTING(MSG_ROUTING_LOCAL) |
>> -		 CDNS_PCIE_NORMAL_MSG_CODE(msg_code) |
>> -		 CDNS_PCIE_MSG_NO_DATA;
>> +		 CDNS_PCIE_NORMAL_MSG_CODE(msg_code);
>>   	writel(0, ep->irq_cpu_addr + offset);
>>   }
>>   
>> diff --git a/drivers/pci/controller/cadence/pcie-cadence.h b/drivers/pci/controller/cadence/pcie-cadence.h
>> index f5eeff834ec1..39ee9945c903 100644
>> --- a/drivers/pci/controller/cadence/pcie-cadence.h
>> +++ b/drivers/pci/controller/cadence/pcie-cadence.h
>> @@ -246,7 +246,7 @@ struct cdns_pcie_rp_ib_bar {
>>   #define CDNS_PCIE_NORMAL_MSG_CODE_MASK		GENMASK(15, 8)
>>   #define CDNS_PCIE_NORMAL_MSG_CODE(code) \
>>   	(((code) << 8) & CDNS_PCIE_NORMAL_MSG_CODE_MASK)
>> -#define CDNS_PCIE_MSG_NO_DATA			BIT(16)
>> +#define CDNS_PCIE_MSG_DATA			BIT(16)
>>   
>>   struct cdns_pcie;
>>   
>>
>> base-commit: bb066fe812d6fb3a9d01c073d9f1e2fd5a63403b
>> -- 
>> 2.47.1
>>
>