[PATCH] PCI: dwc: Move forward the iATU detection process

[PATCH] PCI: dwc: Move forward the iATU detection process

[Zhiqiang Hou]

From: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>

In the dw_pcie_ep_init(), it depends on the detected iATU region
numbers to allocate the in/outbound window management bit map.
It fails after the commit 281f1f99cf3a ("PCI: dwc: Detect number
of iATU windows").

So this patch move the iATU region detection into a new function,
move forward the detection to the very beginning of functions
dw_pcie_host_init() and dw_pcie_ep_init(). And also remove it
from the dw_pcie_setup(), since it's more like a software
perspective initialization step than hardware setup.

Fixes: 281f1f99cf3a ("PCI: dwc: Detect number of iATU windows")
Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
---
 drivers/pci/controller/dwc/pcie-designware-ep.c   |  2 ++
 drivers/pci/controller/dwc/pcie-designware-host.c |  2 ++
 drivers/pci/controller/dwc/pcie-designware.c      | 11 ++++++++---
 drivers/pci/controller/dwc/pcie-designware.h      |  1 +
 4 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c b/drivers/pci/controller/dwc/pcie-designware-ep.c
index bcd1cd9ba8c8..fcf935bf6f5e 100644
--- a/drivers/pci/controller/dwc/pcie-designware-ep.c
+++ b/drivers/pci/controller/dwc/pcie-designware-ep.c
@@ -707,6 +707,8 @@ int dw_pcie_ep_init(struct dw_pcie_ep *ep)
 		}
 	}
 
+	dw_pcie_iatu_detect(pci);
+
 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "addr_space");
 	if (!res)
 		return -EINVAL;
diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
index 8a84c005f32b..8eae817c138d 100644
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -316,6 +316,8 @@ int dw_pcie_host_init(struct pcie_port *pp)
 			return PTR_ERR(pci->dbi_base);
 	}
 
+	dw_pcie_iatu_detect(pci);
+
 	bridge = devm_pci_alloc_host_bridge(dev, 0);
 	if (!bridge)
 		return -ENOMEM;
diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c
index 5b72a5448d2e..5b9bf02d918b 100644
--- a/drivers/pci/controller/dwc/pcie-designware.c
+++ b/drivers/pci/controller/dwc/pcie-designware.c
@@ -654,11 +654,9 @@ static void dw_pcie_iatu_detect_regions(struct dw_pcie *pci)
 	pci->num_ob_windows = ob;
 }
 
-void dw_pcie_setup(struct dw_pcie *pci)
+void dw_pcie_iatu_detect(struct dw_pcie *pci)
 {
-	u32 val;
 	struct device *dev = pci->dev;
-	struct device_node *np = dev->of_node;
 	struct platform_device *pdev = to_platform_device(dev);
 
 	if (pci->version >= 0x480A || (!pci->version &&
@@ -687,6 +685,13 @@ void dw_pcie_setup(struct dw_pcie *pci)
 
 	dev_info(pci->dev, "Detected iATU regions: %u outbound, %u inbound",
 		 pci->num_ob_windows, pci->num_ib_windows);
+}
+
+void dw_pcie_setup(struct dw_pcie *pci)
+{
+	u32 val;
+	struct device *dev = pci->dev;
+	struct device_node *np = dev->of_node;
 
 	if (pci->link_gen > 0)
 		dw_pcie_link_set_max_speed(pci, pci->link_gen);
diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
index 5d979953800d..867369d4c4f7 100644
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h
@@ -305,6 +305,7 @@ int dw_pcie_prog_inbound_atu(struct dw_pcie *pci, u8 func_no, int index,
 void dw_pcie_disable_atu(struct dw_pcie *pci, int index,
 			 enum dw_pcie_region_type type);
 void dw_pcie_setup(struct dw_pcie *pci);
+void dw_pcie_iatu_detect(struct dw_pcie *pci);
 
 static inline void dw_pcie_writel_dbi(struct dw_pcie *pci, u32 reg, u32 val)
 {
-- 
2.17.1

Re: [PATCH] PCI: dwc: Move forward the iATU detection process

[Kunihiko Hayashi]

Hi,

This looks to me the same fix as my posted patch[1].
Is this more effective than mine?

Thank you,

[1] https://www.spinics.net/lists/linux-pci/msg103889.html

On 2021/01/25 13:48, Zhiqiang Hou wrote:
> From: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
> 
> In the dw_pcie_ep_init(), it depends on the detected iATU region
> numbers to allocate the in/outbound window management bit map.
> It fails after the commit 281f1f99cf3a ("PCI: dwc: Detect number
> of iATU windows").
> 
> So this patch move the iATU region detection into a new function,
> move forward the detection to the very beginning of functions
> dw_pcie_host_init() and dw_pcie_ep_init(). And also remove it
> from the dw_pcie_setup(), since it's more like a software
> perspective initialization step than hardware setup.
> 
> Fixes: 281f1f99cf3a ("PCI: dwc: Detect number of iATU windows")
> Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
> ---
>   drivers/pci/controller/dwc/pcie-designware-ep.c   |  2 ++
>   drivers/pci/controller/dwc/pcie-designware-host.c |  2 ++
>   drivers/pci/controller/dwc/pcie-designware.c      | 11 ++++++++---
>   drivers/pci/controller/dwc/pcie-designware.h      |  1 +
>   4 files changed, 13 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c b/drivers/pci/controller/dwc/pcie-designware-ep.c
> index bcd1cd9ba8c8..fcf935bf6f5e 100644
> --- a/drivers/pci/controller/dwc/pcie-designware-ep.c
> +++ b/drivers/pci/controller/dwc/pcie-designware-ep.c
> @@ -707,6 +707,8 @@ int dw_pcie_ep_init(struct dw_pcie_ep *ep)
>   		}
>   	}
>   
> +	dw_pcie_iatu_detect(pci);
> +
>   	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "addr_space");
>   	if (!res)
>   		return -EINVAL;
> diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
> index 8a84c005f32b..8eae817c138d 100644
> --- a/drivers/pci/controller/dwc/pcie-designware-host.c
> +++ b/drivers/pci/controller/dwc/pcie-designware-host.c
> @@ -316,6 +316,8 @@ int dw_pcie_host_init(struct pcie_port *pp)
>   			return PTR_ERR(pci->dbi_base);
>   	}
>   
> +	dw_pcie_iatu_detect(pci);
> +
>   	bridge = devm_pci_alloc_host_bridge(dev, 0);
>   	if (!bridge)
>   		return -ENOMEM;
> diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c
> index 5b72a5448d2e..5b9bf02d918b 100644
> --- a/drivers/pci/controller/dwc/pcie-designware.c
> +++ b/drivers/pci/controller/dwc/pcie-designware.c
> @@ -654,11 +654,9 @@ static void dw_pcie_iatu_detect_regions(struct dw_pcie *pci)
>   	pci->num_ob_windows = ob;
>   }
>   
> -void dw_pcie_setup(struct dw_pcie *pci)
> +void dw_pcie_iatu_detect(struct dw_pcie *pci)
>   {
> -	u32 val;
>   	struct device *dev = pci->dev;
> -	struct device_node *np = dev->of_node;
>   	struct platform_device *pdev = to_platform_device(dev);
>   
>   	if (pci->version >= 0x480A || (!pci->version &&
> @@ -687,6 +685,13 @@ void dw_pcie_setup(struct dw_pcie *pci)
>   
>   	dev_info(pci->dev, "Detected iATU regions: %u outbound, %u inbound",
>   		 pci->num_ob_windows, pci->num_ib_windows);
> +}
> +
> +void dw_pcie_setup(struct dw_pcie *pci)
> +{
> +	u32 val;
> +	struct device *dev = pci->dev;
> +	struct device_node *np = dev->of_node;
>   
>   	if (pci->link_gen > 0)
>   		dw_pcie_link_set_max_speed(pci, pci->link_gen);
> diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
> index 5d979953800d..867369d4c4f7 100644
> --- a/drivers/pci/controller/dwc/pcie-designware.h
> +++ b/drivers/pci/controller/dwc/pcie-designware.h
> @@ -305,6 +305,7 @@ int dw_pcie_prog_inbound_atu(struct dw_pcie *pci, u8 func_no, int index,
>   void dw_pcie_disable_atu(struct dw_pcie *pci, int index,
>   			 enum dw_pcie_region_type type);
>   void dw_pcie_setup(struct dw_pcie *pci);
> +void dw_pcie_iatu_detect(struct dw_pcie *pci);
>   
>   static inline void dw_pcie_writel_dbi(struct dw_pcie *pci, u32 reg, u32 val)
>   {
> 

---
Best Regards
Kunihiko Hayashi

RE: [PATCH] PCI: dwc: Move forward the iATU detection process

[Z.q. Hou]

Hi,

Yes, they are fix the same issue.
Rob and other contributors sent so many patches to refine the drivers and make the code brief and more readable, so I don't think we should just focus on the fixes of this issue. I don't think it is a good choice that your patch move some of the software perspective initializations into hardware ones.

Thanks
Zhiqiang

> -----Original Message-----
> From: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
> Sent: 2021年1月26日 13:26
> To: Z.q. Hou <zhiqiang.hou@nxp.com>
> Cc: linux-kernel@vger.kernel.org; linux-pci@vger.kernel.org;
> lorenzo.pieralisi@arm.com; robh@kernel.org; bhelgaas@google.com;
> gustavo.pimentel@synopsys.com; jingoohan1@gmail.com;
> jaswinder.singh@linaro.org; masami.hiramatsu@linaro.org
> Subject: Re: [PATCH] PCI: dwc: Move forward the iATU detection process
> 
> Hi,
> 
> This looks to me the same fix as my posted patch[1].
> Is this more effective than mine?
> 
> Thank you,
> 
> [1]
> https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww
> .spinics.net%2Flists%2Flinux-pci%2Fmsg103889.html&amp;data=04%7C01%
> 7CZhiqiang.Hou%40nxp.com%7Cd9fa58aac4774c9dd61b08d8c1bad128%7C
> 686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C637472355412202563
> %7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiL
> CJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&amp;sdata=Mt3B4jQ1Q1fu%2
> FAz9s4Y4eieHv7nYorvvT2pKlqFLE9k%3D&amp;reserved=0
> 
> On 2021/01/25 13:48, Zhiqiang Hou wrote:
> > From: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
> >
> > In the dw_pcie_ep_init(), it depends on the detected iATU region
> > numbers to allocate the in/outbound window management bit map.
> > It fails after the commit 281f1f99cf3a ("PCI: dwc: Detect number of
> > iATU windows").
> >
> > So this patch move the iATU region detection into a new function, move
> > forward the detection to the very beginning of functions
> > dw_pcie_host_init() and dw_pcie_ep_init(). And also remove it from the
> > dw_pcie_setup(), since it's more like a software perspective
> > initialization step than hardware setup.
> >
> > Fixes: 281f1f99cf3a ("PCI: dwc: Detect number of iATU windows")
> > Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
> > ---
> >   drivers/pci/controller/dwc/pcie-designware-ep.c   |  2 ++
> >   drivers/pci/controller/dwc/pcie-designware-host.c |  2 ++
> >   drivers/pci/controller/dwc/pcie-designware.c      | 11 ++++++++---
> >   drivers/pci/controller/dwc/pcie-designware.h      |  1 +
> >   4 files changed, 13 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c
> > b/drivers/pci/controller/dwc/pcie-designware-ep.c
> > index bcd1cd9ba8c8..fcf935bf6f5e 100644
> > --- a/drivers/pci/controller/dwc/pcie-designware-ep.c
> > +++ b/drivers/pci/controller/dwc/pcie-designware-ep.c
> > @@ -707,6 +707,8 @@ int dw_pcie_ep_init(struct dw_pcie_ep *ep)
> >   		}
> >   	}
> >
> > +	dw_pcie_iatu_detect(pci);
> > +
> >   	res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
> "addr_space");
> >   	if (!res)
> >   		return -EINVAL;
> > diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c
> > b/drivers/pci/controller/dwc/pcie-designware-host.c
> > index 8a84c005f32b..8eae817c138d 100644
> > --- a/drivers/pci/controller/dwc/pcie-designware-host.c
> > +++ b/drivers/pci/controller/dwc/pcie-designware-host.c
> > @@ -316,6 +316,8 @@ int dw_pcie_host_init(struct pcie_port *pp)
> >   			return PTR_ERR(pci->dbi_base);
> >   	}
> >
> > +	dw_pcie_iatu_detect(pci);
> > +
> >   	bridge = devm_pci_alloc_host_bridge(dev, 0);
> >   	if (!bridge)
> >   		return -ENOMEM;
> > diff --git a/drivers/pci/controller/dwc/pcie-designware.c
> > b/drivers/pci/controller/dwc/pcie-designware.c
> > index 5b72a5448d2e..5b9bf02d918b 100644
> > --- a/drivers/pci/controller/dwc/pcie-designware.c
> > +++ b/drivers/pci/controller/dwc/pcie-designware.c
> > @@ -654,11 +654,9 @@ static void dw_pcie_iatu_detect_regions(struct
> dw_pcie *pci)
> >   	pci->num_ob_windows = ob;
> >   }
> >
> > -void dw_pcie_setup(struct dw_pcie *pci)
> > +void dw_pcie_iatu_detect(struct dw_pcie *pci)
> >   {
> > -	u32 val;
> >   	struct device *dev = pci->dev;
> > -	struct device_node *np = dev->of_node;
> >   	struct platform_device *pdev = to_platform_device(dev);
> >
> >   	if (pci->version >= 0x480A || (!pci->version && @@ -687,6 +685,13
> > @@ void dw_pcie_setup(struct dw_pcie *pci)
> >
> >   	dev_info(pci->dev, "Detected iATU regions: %u outbound, %u
> inbound",
> >   		 pci->num_ob_windows, pci->num_ib_windows);
> > +}
> > +
> > +void dw_pcie_setup(struct dw_pcie *pci) {
> > +	u32 val;
> > +	struct device *dev = pci->dev;
> > +	struct device_node *np = dev->of_node;
> >
> >   	if (pci->link_gen > 0)
> >   		dw_pcie_link_set_max_speed(pci, pci->link_gen); diff --git
> > a/drivers/pci/controller/dwc/pcie-designware.h
> > b/drivers/pci/controller/dwc/pcie-designware.h
> > index 5d979953800d..867369d4c4f7 100644
> > --- a/drivers/pci/controller/dwc/pcie-designware.h
> > +++ b/drivers/pci/controller/dwc/pcie-designware.h
> > @@ -305,6 +305,7 @@ int dw_pcie_prog_inbound_atu(struct dw_pcie
> *pci, u8 func_no, int index,
> >   void dw_pcie_disable_atu(struct dw_pcie *pci, int index,
> >   			 enum dw_pcie_region_type type);
> >   void dw_pcie_setup(struct dw_pcie *pci);
> > +void dw_pcie_iatu_detect(struct dw_pcie *pci);
> >
> >   static inline void dw_pcie_writel_dbi(struct dw_pcie *pci, u32 reg, u32
> val)
> >   {
> >
> 
> ---
> Best Regards
> Kunihiko Hayashi

Re: [PATCH] PCI: dwc: Move forward the iATU detection process

[Kunihiko Hayashi]

On 2021/01/27 15:27, Z.q. Hou wrote:
> Hi,
> 
> Yes, they are fix the same issue.
> Rob and other contributors sent so many patches to refine the drivers and make the code brief and more readable, so I don't think we should just focus on the fixes of this issue. I don't think it is a good choice that your patch move some of the software perspective initializations into hardware ones.

Ok, I checked your patch fixed this issue on my board with or without
my patch. I'll follow the maintainers for handling my patch.

Tested-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>

Thank you,

> 
> Thanks
> Zhiqiang
> 
>> -----Original Message-----
>> From: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
>> Sent: 2021年1月26日 13:26
>> To: Z.q. Hou <zhiqiang.hou@nxp.com>
>> Cc: linux-kernel@vger.kernel.org; linux-pci@vger.kernel.org;
>> lorenzo.pieralisi@arm.com; robh@kernel.org; bhelgaas@google.com;
>> gustavo.pimentel@synopsys.com; jingoohan1@gmail.com;
>> jaswinder.singh@linaro.org; masami.hiramatsu@linaro.org
>> Subject: Re: [PATCH] PCI: dwc: Move forward the iATU detection process
>>
>> Hi,
>>
>> This looks to me the same fix as my posted patch[1].
>> Is this more effective than mine?
>>
>> Thank you,
>>
>> [1]
>> https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww
>> .spinics.net%2Flists%2Flinux-pci%2Fmsg103889.html&amp;data=04%7C01%
>> 7CZhiqiang.Hou%40nxp.com%7Cd9fa58aac4774c9dd61b08d8c1bad128%7C
>> 686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C637472355412202563
>> %7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiL
>> CJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&amp;sdata=Mt3B4jQ1Q1fu%2
>> FAz9s4Y4eieHv7nYorvvT2pKlqFLE9k%3D&amp;reserved=0
>>
>> On 2021/01/25 13:48, Zhiqiang Hou wrote:
>>> From: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
>>>
>>> In the dw_pcie_ep_init(), it depends on the detected iATU region
>>> numbers to allocate the in/outbound window management bit map.
>>> It fails after the commit 281f1f99cf3a ("PCI: dwc: Detect number of
>>> iATU windows").
>>>
>>> So this patch move the iATU region detection into a new function, move
>>> forward the detection to the very beginning of functions
>>> dw_pcie_host_init() and dw_pcie_ep_init(). And also remove it from the
>>> dw_pcie_setup(), since it's more like a software perspective
>>> initialization step than hardware setup.
>>>
>>> Fixes: 281f1f99cf3a ("PCI: dwc: Detect number of iATU windows")
>>> Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
>>> ---
>>>    drivers/pci/controller/dwc/pcie-designware-ep.c   |  2 ++
>>>    drivers/pci/controller/dwc/pcie-designware-host.c |  2 ++
>>>    drivers/pci/controller/dwc/pcie-designware.c      | 11 ++++++++---
>>>    drivers/pci/controller/dwc/pcie-designware.h      |  1 +
>>>    4 files changed, 13 insertions(+), 3 deletions(-)
>>>
>>> diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c
>>> b/drivers/pci/controller/dwc/pcie-designware-ep.c
>>> index bcd1cd9ba8c8..fcf935bf6f5e 100644
>>> --- a/drivers/pci/controller/dwc/pcie-designware-ep.c
>>> +++ b/drivers/pci/controller/dwc/pcie-designware-ep.c
>>> @@ -707,6 +707,8 @@ int dw_pcie_ep_init(struct dw_pcie_ep *ep)
>>>    		}
>>>    	}
>>>
>>> +	dw_pcie_iatu_detect(pci);
>>> +
>>>    	res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
>> "addr_space");
>>>    	if (!res)
>>>    		return -EINVAL;
>>> diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c
>>> b/drivers/pci/controller/dwc/pcie-designware-host.c
>>> index 8a84c005f32b..8eae817c138d 100644
>>> --- a/drivers/pci/controller/dwc/pcie-designware-host.c
>>> +++ b/drivers/pci/controller/dwc/pcie-designware-host.c
>>> @@ -316,6 +316,8 @@ int dw_pcie_host_init(struct pcie_port *pp)
>>>    			return PTR_ERR(pci->dbi_base);
>>>    	}
>>>
>>> +	dw_pcie_iatu_detect(pci);
>>> +
>>>    	bridge = devm_pci_alloc_host_bridge(dev, 0);
>>>    	if (!bridge)
>>>    		return -ENOMEM;
>>> diff --git a/drivers/pci/controller/dwc/pcie-designware.c
>>> b/drivers/pci/controller/dwc/pcie-designware.c
>>> index 5b72a5448d2e..5b9bf02d918b 100644
>>> --- a/drivers/pci/controller/dwc/pcie-designware.c
>>> +++ b/drivers/pci/controller/dwc/pcie-designware.c
>>> @@ -654,11 +654,9 @@ static void dw_pcie_iatu_detect_regions(struct
>> dw_pcie *pci)
>>>    	pci->num_ob_windows = ob;
>>>    }
>>>
>>> -void dw_pcie_setup(struct dw_pcie *pci)
>>> +void dw_pcie_iatu_detect(struct dw_pcie *pci)
>>>    {
>>> -	u32 val;
>>>    	struct device *dev = pci->dev;
>>> -	struct device_node *np = dev->of_node;
>>>    	struct platform_device *pdev = to_platform_device(dev);
>>>
>>>    	if (pci->version >= 0x480A || (!pci->version && @@ -687,6 +685,13
>>> @@ void dw_pcie_setup(struct dw_pcie *pci)
>>>
>>>    	dev_info(pci->dev, "Detected iATU regions: %u outbound, %u
>> inbound",
>>>    		 pci->num_ob_windows, pci->num_ib_windows);
>>> +}
>>> +
>>> +void dw_pcie_setup(struct dw_pcie *pci) {
>>> +	u32 val;
>>> +	struct device *dev = pci->dev;
>>> +	struct device_node *np = dev->of_node;
>>>
>>>    	if (pci->link_gen > 0)
>>>    		dw_pcie_link_set_max_speed(pci, pci->link_gen); diff --git
>>> a/drivers/pci/controller/dwc/pcie-designware.h
>>> b/drivers/pci/controller/dwc/pcie-designware.h
>>> index 5d979953800d..867369d4c4f7 100644
>>> --- a/drivers/pci/controller/dwc/pcie-designware.h
>>> +++ b/drivers/pci/controller/dwc/pcie-designware.h
>>> @@ -305,6 +305,7 @@ int dw_pcie_prog_inbound_atu(struct dw_pcie
>> *pci, u8 func_no, int index,
>>>    void dw_pcie_disable_atu(struct dw_pcie *pci, int index,
>>>    			 enum dw_pcie_region_type type);
>>>    void dw_pcie_setup(struct dw_pcie *pci);
>>> +void dw_pcie_iatu_detect(struct dw_pcie *pci);
>>>
>>>    static inline void dw_pcie_writel_dbi(struct dw_pcie *pci, u32 reg, u32
>> val)
>>>    {
>>>
>>
>> ---
>> Best Regards
>> Kunihiko Hayashi

---
Best Regards
Kunihiko Hayashi

Re: [PATCH] PCI: dwc: Move forward the iATU detection process

[Rob Herring]

On Sun, Jan 24, 2021 at 10:39 PM Zhiqiang Hou <Zhiqiang.Hou@nxp.com> wrote:
>
> From: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
>
> In the dw_pcie_ep_init(), it depends on the detected iATU region
> numbers to allocate the in/outbound window management bit map.
> It fails after the commit 281f1f99cf3a ("PCI: dwc: Detect number
> of iATU windows").
>
> So this patch move the iATU region detection into a new function,
> move forward the detection to the very beginning of functions
> dw_pcie_host_init() and dw_pcie_ep_init(). And also remove it
> from the dw_pcie_setup(), since it's more like a software
> perspective initialization step than hardware setup.
>
> Fixes: 281f1f99cf3a ("PCI: dwc: Detect number of iATU windows")
> Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
> ---
>  drivers/pci/controller/dwc/pcie-designware-ep.c   |  2 ++
>  drivers/pci/controller/dwc/pcie-designware-host.c |  2 ++
>  drivers/pci/controller/dwc/pcie-designware.c      | 11 ++++++++---
>  drivers/pci/controller/dwc/pcie-designware.h      |  1 +
>  4 files changed, 13 insertions(+), 3 deletions(-)

Reviewed-by: Rob Herring <robh@kernel.org>

Bjorn, can you pick this up for 5.12. Lorenzo is on holiday.

Rob

Re: [PATCH] PCI: dwc: Move forward the iATU detection process

[Lorenzo Pieralisi]

On Mon, 25 Jan 2021 12:48:03 +0800, Zhiqiang Hou wrote:
> In the dw_pcie_ep_init(), it depends on the detected iATU region
> numbers to allocate the in/outbound window management bit map.
> It fails after the commit 281f1f99cf3a ("PCI: dwc: Detect number
> of iATU windows").
> 
> So this patch move the iATU region detection into a new function,
> move forward the detection to the very beginning of functions
> dw_pcie_host_init() and dw_pcie_ep_init(). And also remove it
> from the dw_pcie_setup(), since it's more like a software
> perspective initialization step than hardware setup.

Applied to pci/dwc, thanks!

[1/1] PCI: dwc: Move forward the iATU detection process
      https://git.kernel.org/lpieralisi/pci/c/5ff8ca16f8

Thanks,
Lorenzo

Re: [PATCH] PCI: dwc: Move forward the iATU detection process

[Lorenzo Pieralisi]

On Mon, Mar 22, 2021 at 06:03:57PM +0000, Lorenzo Pieralisi wrote:
> On Mon, 25 Jan 2021 12:48:03 +0800, Zhiqiang Hou wrote:
> > In the dw_pcie_ep_init(), it depends on the detected iATU region
> > numbers to allocate the in/outbound window management bit map.
> > It fails after the commit 281f1f99cf3a ("PCI: dwc: Detect number
> > of iATU windows").
> > 
> > So this patch move the iATU region detection into a new function,
> > move forward the detection to the very beginning of functions
> > dw_pcie_host_init() and dw_pcie_ep_init(). And also remove it
> > from the dw_pcie_setup(), since it's more like a software
> > perspective initialization step than hardware setup.
> 
> Applied to pci/dwc, thanks!
> 
> [1/1] PCI: dwc: Move forward the iATU detection process
>       https://git.kernel.org/lpieralisi/pci/c/5ff8ca16f8

Bjorn will queue it for v5.12, so I have dropped it, ignore
this notification.

Thanks,
Lorenzo

Re: [PATCH] PCI: dwc: Move forward the iATU detection process

[Bjorn Helgaas]

On Mon, Jan 25, 2021 at 12:48:03PM +0800, Zhiqiang Hou wrote:
> From: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
> 
> In the dw_pcie_ep_init(), it depends on the detected iATU region
> numbers to allocate the in/outbound window management bit map.
> It fails after the commit 281f1f99cf3a ("PCI: dwc: Detect number
> of iATU windows").
> 
> So this patch move the iATU region detection into a new function,
> move forward the detection to the very beginning of functions
> dw_pcie_host_init() and dw_pcie_ep_init(). And also remove it
> from the dw_pcie_setup(), since it's more like a software
> perspective initialization step than hardware setup.
> 
> Fixes: 281f1f99cf3a ("PCI: dwc: Detect number of iATU windows")
> Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>

Applied to for-linus for v5.12, with stable tag for v5.11, thanks!

> ---
>  drivers/pci/controller/dwc/pcie-designware-ep.c   |  2 ++
>  drivers/pci/controller/dwc/pcie-designware-host.c |  2 ++
>  drivers/pci/controller/dwc/pcie-designware.c      | 11 ++++++++---
>  drivers/pci/controller/dwc/pcie-designware.h      |  1 +
>  4 files changed, 13 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c b/drivers/pci/controller/dwc/pcie-designware-ep.c
> index bcd1cd9ba8c8..fcf935bf6f5e 100644
> --- a/drivers/pci/controller/dwc/pcie-designware-ep.c
> +++ b/drivers/pci/controller/dwc/pcie-designware-ep.c
> @@ -707,6 +707,8 @@ int dw_pcie_ep_init(struct dw_pcie_ep *ep)
>  		}
>  	}
>  
> +	dw_pcie_iatu_detect(pci);
> +
>  	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "addr_space");
>  	if (!res)
>  		return -EINVAL;
> diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
> index 8a84c005f32b..8eae817c138d 100644
> --- a/drivers/pci/controller/dwc/pcie-designware-host.c
> +++ b/drivers/pci/controller/dwc/pcie-designware-host.c
> @@ -316,6 +316,8 @@ int dw_pcie_host_init(struct pcie_port *pp)
>  			return PTR_ERR(pci->dbi_base);
>  	}
>  
> +	dw_pcie_iatu_detect(pci);
> +
>  	bridge = devm_pci_alloc_host_bridge(dev, 0);
>  	if (!bridge)
>  		return -ENOMEM;
> diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c
> index 5b72a5448d2e..5b9bf02d918b 100644
> --- a/drivers/pci/controller/dwc/pcie-designware.c
> +++ b/drivers/pci/controller/dwc/pcie-designware.c
> @@ -654,11 +654,9 @@ static void dw_pcie_iatu_detect_regions(struct dw_pcie *pci)
>  	pci->num_ob_windows = ob;
>  }
>  
> -void dw_pcie_setup(struct dw_pcie *pci)
> +void dw_pcie_iatu_detect(struct dw_pcie *pci)
>  {
> -	u32 val;
>  	struct device *dev = pci->dev;
> -	struct device_node *np = dev->of_node;
>  	struct platform_device *pdev = to_platform_device(dev);
>  
>  	if (pci->version >= 0x480A || (!pci->version &&
> @@ -687,6 +685,13 @@ void dw_pcie_setup(struct dw_pcie *pci)
>  
>  	dev_info(pci->dev, "Detected iATU regions: %u outbound, %u inbound",
>  		 pci->num_ob_windows, pci->num_ib_windows);
> +}
> +
> +void dw_pcie_setup(struct dw_pcie *pci)
> +{
> +	u32 val;
> +	struct device *dev = pci->dev;
> +	struct device_node *np = dev->of_node;
>  
>  	if (pci->link_gen > 0)
>  		dw_pcie_link_set_max_speed(pci, pci->link_gen);
> diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
> index 5d979953800d..867369d4c4f7 100644
> --- a/drivers/pci/controller/dwc/pcie-designware.h
> +++ b/drivers/pci/controller/dwc/pcie-designware.h
> @@ -305,6 +305,7 @@ int dw_pcie_prog_inbound_atu(struct dw_pcie *pci, u8 func_no, int index,
>  void dw_pcie_disable_atu(struct dw_pcie *pci, int index,
>  			 enum dw_pcie_region_type type);
>  void dw_pcie_setup(struct dw_pcie *pci);
> +void dw_pcie_iatu_detect(struct dw_pcie *pci);
>  
>  static inline void dw_pcie_writel_dbi(struct dw_pcie *pci, u32 reg, u32 val)
>  {
> -- 
> 2.17.1
> 

Re: [PATCH] PCI: dwc: Move forward the iATU detection process

[Marek Szyprowski]

Hi,

On 25.01.2021 05:48, Zhiqiang Hou wrote:
> From: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
>
> In the dw_pcie_ep_init(), it depends on the detected iATU region
> numbers to allocate the in/outbound window management bit map.
> It fails after the commit 281f1f99cf3a ("PCI: dwc: Detect number
> of iATU windows").
>
> So this patch move the iATU region detection into a new function,
> move forward the detection to the very beginning of functions
> dw_pcie_host_init() and dw_pcie_ep_init(). And also remove it
> from the dw_pcie_setup(), since it's more like a software
> perspective initialization step than hardware setup.
>
> Fixes: 281f1f99cf3a ("PCI: dwc: Detect number of iATU windows")
> Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>

This patch causes exynos-pcie to hang during the initialization. It 
looks that some resources are not enabled yet, so calling 
dw_pcie_iatu_detect() much earlier causes a hang. When I have some time, 
I will try to identify what is needed to call it properly.

> ---
>   drivers/pci/controller/dwc/pcie-designware-ep.c   |  2 ++
>   drivers/pci/controller/dwc/pcie-designware-host.c |  2 ++
>   drivers/pci/controller/dwc/pcie-designware.c      | 11 ++++++++---
>   drivers/pci/controller/dwc/pcie-designware.h      |  1 +
>   4 files changed, 13 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c b/drivers/pci/controller/dwc/pcie-designware-ep.c
> index bcd1cd9ba8c8..fcf935bf6f5e 100644
> --- a/drivers/pci/controller/dwc/pcie-designware-ep.c
> +++ b/drivers/pci/controller/dwc/pcie-designware-ep.c
> @@ -707,6 +707,8 @@ int dw_pcie_ep_init(struct dw_pcie_ep *ep)
>   		}
>   	}
>   
> +	dw_pcie_iatu_detect(pci);
> +
>   	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "addr_space");
>   	if (!res)
>   		return -EINVAL;
> diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
> index 8a84c005f32b..8eae817c138d 100644
> --- a/drivers/pci/controller/dwc/pcie-designware-host.c
> +++ b/drivers/pci/controller/dwc/pcie-designware-host.c
> @@ -316,6 +316,8 @@ int dw_pcie_host_init(struct pcie_port *pp)
>   			return PTR_ERR(pci->dbi_base);
>   	}
>   
> +	dw_pcie_iatu_detect(pci);
> +
>   	bridge = devm_pci_alloc_host_bridge(dev, 0);
>   	if (!bridge)
>   		return -ENOMEM;
> diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c
> index 5b72a5448d2e..5b9bf02d918b 100644
> --- a/drivers/pci/controller/dwc/pcie-designware.c
> +++ b/drivers/pci/controller/dwc/pcie-designware.c
> @@ -654,11 +654,9 @@ static void dw_pcie_iatu_detect_regions(struct dw_pcie *pci)
>   	pci->num_ob_windows = ob;
>   }
>   
> -void dw_pcie_setup(struct dw_pcie *pci)
> +void dw_pcie_iatu_detect(struct dw_pcie *pci)
>   {
> -	u32 val;
>   	struct device *dev = pci->dev;
> -	struct device_node *np = dev->of_node;
>   	struct platform_device *pdev = to_platform_device(dev);
>   
>   	if (pci->version >= 0x480A || (!pci->version &&
> @@ -687,6 +685,13 @@ void dw_pcie_setup(struct dw_pcie *pci)
>   
>   	dev_info(pci->dev, "Detected iATU regions: %u outbound, %u inbound",
>   		 pci->num_ob_windows, pci->num_ib_windows);
> +}
> +
> +void dw_pcie_setup(struct dw_pcie *pci)
> +{
> +	u32 val;
> +	struct device *dev = pci->dev;
> +	struct device_node *np = dev->of_node;
>   
>   	if (pci->link_gen > 0)
>   		dw_pcie_link_set_max_speed(pci, pci->link_gen);
> diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
> index 5d979953800d..867369d4c4f7 100644
> --- a/drivers/pci/controller/dwc/pcie-designware.h
> +++ b/drivers/pci/controller/dwc/pcie-designware.h
> @@ -305,6 +305,7 @@ int dw_pcie_prog_inbound_atu(struct dw_pcie *pci, u8 func_no, int index,
>   void dw_pcie_disable_atu(struct dw_pcie *pci, int index,
>   			 enum dw_pcie_region_type type);
>   void dw_pcie_setup(struct dw_pcie *pci);
> +void dw_pcie_iatu_detect(struct dw_pcie *pci);
>   
>   static inline void dw_pcie_writel_dbi(struct dw_pcie *pci, u32 reg, u32 val)
>   {

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland

Re: [PATCH] PCI: dwc: Move forward the iATU detection process

[Bjorn Helgaas]

On Thu, Mar 25, 2021 at 10:24:28AM +0100, Marek Szyprowski wrote:
> On 25.01.2021 05:48, Zhiqiang Hou wrote:
> > From: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
> >
> > In the dw_pcie_ep_init(), it depends on the detected iATU region
> > numbers to allocate the in/outbound window management bit map.
> > It fails after the commit 281f1f99cf3a ("PCI: dwc: Detect number
> > of iATU windows").
> >
> > So this patch move the iATU region detection into a new function,
> > move forward the detection to the very beginning of functions
> > dw_pcie_host_init() and dw_pcie_ep_init(). And also remove it
> > from the dw_pcie_setup(), since it's more like a software
> > perspective initialization step than hardware setup.
> >
> > Fixes: 281f1f99cf3a ("PCI: dwc: Detect number of iATU windows")
> > Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
> 
> This patch causes exynos-pcie to hang during the initialization. It 
> looks that some resources are not enabled yet, so calling 
> dw_pcie_iatu_detect() much earlier causes a hang. When I have some time, 
> I will try to identify what is needed to call it properly.

Thanks, I dropped it for now.  We can add it back after we figure out
what the exynos issue is.

For reference, here's the patch I dropped (I had made some minor
corrections to the commit log):

commit fd4162f05194 ("PCI: dwc: Move iATU detection earlier")
Author: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
Date:   Mon Jan 25 12:48:03 2021 +0800

    PCI: dwc: Move iATU detection earlier
    
    dw_pcie_ep_init() depends on the detected iATU region numbers to allocate
    the in/outbound window management bitmap.  It fails after 281f1f99cf3a
    ("PCI: dwc: Detect number of iATU windows").
    
    Move the iATU region detection into a new function, move the detection to
    the very beginning of dw_pcie_host_init() and dw_pcie_ep_init().  Also
    remove it from the dw_pcie_setup(), since it's more like a software
    initialization step than hardware setup.
    
    Fixes: 281f1f99cf3a ("PCI: dwc: Detect number of iATU windows")
    Link: https://lore.kernel.org/r/20210125044803.4310-1-Zhiqiang.Hou@nxp.com
    Tested-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
    Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
    Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
    Reviewed-by: Rob Herring <robh@kernel.org>
    Cc: stable@vger.kernel.org	# v5.11+

diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c b/drivers/pci/controller/dwc/pcie-designware-ep.c
index 1c25d8337151..8d028a88b375 100644
--- a/drivers/pci/controller/dwc/pcie-designware-ep.c
+++ b/drivers/pci/controller/dwc/pcie-designware-ep.c
@@ -705,6 +705,8 @@ int dw_pcie_ep_init(struct dw_pcie_ep *ep)
 		}
 	}
 
+	dw_pcie_iatu_detect(pci);
+
 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "addr_space");
 	if (!res)
 		return -EINVAL;
diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
index 7e55b2b66182..52f6887179cd 100644
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -319,6 +319,8 @@ int dw_pcie_host_init(struct pcie_port *pp)
 			return PTR_ERR(pci->dbi_base);
 	}
 
+	dw_pcie_iatu_detect(pci);
+
 	bridge = devm_pci_alloc_host_bridge(dev, 0);
 	if (!bridge)
 		return -ENOMEM;
diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c
index 004cb860e266..a945f0c0e73d 100644
--- a/drivers/pci/controller/dwc/pcie-designware.c
+++ b/drivers/pci/controller/dwc/pcie-designware.c
@@ -660,11 +660,9 @@ static void dw_pcie_iatu_detect_regions(struct dw_pcie *pci)
 	pci->num_ob_windows = ob;
 }
 
-void dw_pcie_setup(struct dw_pcie *pci)
+void dw_pcie_iatu_detect(struct dw_pcie *pci)
 {
-	u32 val;
 	struct device *dev = pci->dev;
-	struct device_node *np = dev->of_node;
 	struct platform_device *pdev = to_platform_device(dev);
 
 	if (pci->version >= 0x480A || (!pci->version &&
@@ -693,6 +691,13 @@ void dw_pcie_setup(struct dw_pcie *pci)
 
 	dev_info(pci->dev, "Detected iATU regions: %u outbound, %u inbound",
 		 pci->num_ob_windows, pci->num_ib_windows);
+}
+
+void dw_pcie_setup(struct dw_pcie *pci)
+{
+	u32 val;
+	struct device *dev = pci->dev;
+	struct device_node *np = dev->of_node;
 
 	if (pci->link_gen > 0)
 		dw_pcie_link_set_max_speed(pci, pci->link_gen);
diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
index 7247c8b01f04..7d6e9b7576be 100644
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h
@@ -306,6 +306,7 @@ int dw_pcie_prog_inbound_atu(struct dw_pcie *pci, u8 func_no, int index,
 void dw_pcie_disable_atu(struct dw_pcie *pci, int index,
 			 enum dw_pcie_region_type type);
 void dw_pcie_setup(struct dw_pcie *pci);
+void dw_pcie_iatu_detect(struct dw_pcie *pci);
 
 static inline void dw_pcie_writel_dbi(struct dw_pcie *pci, u32 reg, u32 val)
 {

Re: [PATCH] PCI: dwc: Move forward the iATU detection process

[Marek Szyprowski]

On 25.03.2021 21:19, Bjorn Helgaas wrote:
> On Thu, Mar 25, 2021 at 10:24:28AM +0100, Marek Szyprowski wrote:
>> On 25.01.2021 05:48, Zhiqiang Hou wrote:
>>> From: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
>>>
>>> In the dw_pcie_ep_init(), it depends on the detected iATU region
>>> numbers to allocate the in/outbound window management bit map.
>>> It fails after the commit 281f1f99cf3a ("PCI: dwc: Detect number
>>> of iATU windows").
>>>
>>> So this patch move the iATU region detection into a new function,
>>> move forward the detection to the very beginning of functions
>>> dw_pcie_host_init() and dw_pcie_ep_init(). And also remove it
>>> from the dw_pcie_setup(), since it's more like a software
>>> perspective initialization step than hardware setup.
>>>
>>> Fixes: 281f1f99cf3a ("PCI: dwc: Detect number of iATU windows")
>>> Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
>> This patch causes exynos-pcie to hang during the initialization. It
>> looks that some resources are not enabled yet, so calling
>> dw_pcie_iatu_detect() much earlier causes a hang. When I have some time,
>> I will try to identify what is needed to call it properly.
> Thanks, I dropped it for now.  We can add it back after we figure out
> what the exynos issue is.
Thanks, I will try to identify at which point of initialization it is 
safe to call iATU region detection.
> For reference, here's the patch I dropped (I had made some minor
> corrections to the commit log):
>
> commit fd4162f05194 ("PCI: dwc: Move iATU detection earlier")
> Author: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
> Date:   Mon Jan 25 12:48:03 2021 +0800
>
>      PCI: dwc: Move iATU detection earlier
>      
>      dw_pcie_ep_init() depends on the detected iATU region numbers to allocate
>      the in/outbound window management bitmap.  It fails after 281f1f99cf3a
>      ("PCI: dwc: Detect number of iATU windows").
>      
>      Move the iATU region detection into a new function, move the detection to
>      the very beginning of dw_pcie_host_init() and dw_pcie_ep_init().  Also
>      remove it from the dw_pcie_setup(), since it's more like a software
>      initialization step than hardware setup.
>      
>      Fixes: 281f1f99cf3a ("PCI: dwc: Detect number of iATU windows")
>      Link: https://lore.kernel.org/r/20210125044803.4310-1-Zhiqiang.Hou@nxp.com
>      Tested-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
>      Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
>      Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
>      Reviewed-by: Rob Herring <robh@kernel.org>
>      Cc: stable@vger.kernel.org	# v5.11+
>
> diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c b/drivers/pci/controller/dwc/pcie-designware-ep.c
> index 1c25d8337151..8d028a88b375 100644
> --- a/drivers/pci/controller/dwc/pcie-designware-ep.c
> +++ b/drivers/pci/controller/dwc/pcie-designware-ep.c
> @@ -705,6 +705,8 @@ int dw_pcie_ep_init(struct dw_pcie_ep *ep)
>   		}
>   	}
>   
> +	dw_pcie_iatu_detect(pci);
> +
>   	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "addr_space");
>   	if (!res)
>   		return -EINVAL;
> diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
> index 7e55b2b66182..52f6887179cd 100644
> --- a/drivers/pci/controller/dwc/pcie-designware-host.c
> +++ b/drivers/pci/controller/dwc/pcie-designware-host.c
> @@ -319,6 +319,8 @@ int dw_pcie_host_init(struct pcie_port *pp)
>   			return PTR_ERR(pci->dbi_base);
>   	}
>   
> +	dw_pcie_iatu_detect(pci);
> +
>   	bridge = devm_pci_alloc_host_bridge(dev, 0);
>   	if (!bridge)
>   		return -ENOMEM;
> diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c
> index 004cb860e266..a945f0c0e73d 100644
> --- a/drivers/pci/controller/dwc/pcie-designware.c
> +++ b/drivers/pci/controller/dwc/pcie-designware.c
> @@ -660,11 +660,9 @@ static void dw_pcie_iatu_detect_regions(struct dw_pcie *pci)
>   	pci->num_ob_windows = ob;
>   }
>   
> -void dw_pcie_setup(struct dw_pcie *pci)
> +void dw_pcie_iatu_detect(struct dw_pcie *pci)
>   {
> -	u32 val;
>   	struct device *dev = pci->dev;
> -	struct device_node *np = dev->of_node;
>   	struct platform_device *pdev = to_platform_device(dev);
>   
>   	if (pci->version >= 0x480A || (!pci->version &&
> @@ -693,6 +691,13 @@ void dw_pcie_setup(struct dw_pcie *pci)
>   
>   	dev_info(pci->dev, "Detected iATU regions: %u outbound, %u inbound",
>   		 pci->num_ob_windows, pci->num_ib_windows);
> +}
> +
> +void dw_pcie_setup(struct dw_pcie *pci)
> +{
> +	u32 val;
> +	struct device *dev = pci->dev;
> +	struct device_node *np = dev->of_node;
>   
>   	if (pci->link_gen > 0)
>   		dw_pcie_link_set_max_speed(pci, pci->link_gen);
> diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
> index 7247c8b01f04..7d6e9b7576be 100644
> --- a/drivers/pci/controller/dwc/pcie-designware.h
> +++ b/drivers/pci/controller/dwc/pcie-designware.h
> @@ -306,6 +306,7 @@ int dw_pcie_prog_inbound_atu(struct dw_pcie *pci, u8 func_no, int index,
>   void dw_pcie_disable_atu(struct dw_pcie *pci, int index,
>   			 enum dw_pcie_region_type type);
>   void dw_pcie_setup(struct dw_pcie *pci);
> +void dw_pcie_iatu_detect(struct dw_pcie *pci);
>   
>   static inline void dw_pcie_writel_dbi(struct dw_pcie *pci, u32 reg, u32 val)
>   {
>
Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland

Re: [PATCH] PCI: dwc: Move forward the iATU detection process

[Marek Szyprowski]

On 26.03.2021 18:05, Marek Szyprowski wrote:
> On 25.03.2021 21:19, Bjorn Helgaas wrote:
>> On Thu, Mar 25, 2021 at 10:24:28AM +0100, Marek Szyprowski wrote:
>>> On 25.01.2021 05:48, Zhiqiang Hou wrote:
>>>> From: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
>>>>
>>>> In the dw_pcie_ep_init(), it depends on the detected iATU region
>>>> numbers to allocate the in/outbound window management bit map.
>>>> It fails after the commit 281f1f99cf3a ("PCI: dwc: Detect number
>>>> of iATU windows").
>>>>
>>>> So this patch move the iATU region detection into a new function,
>>>> move forward the detection to the very beginning of functions
>>>> dw_pcie_host_init() and dw_pcie_ep_init(). And also remove it
>>>> from the dw_pcie_setup(), since it's more like a software
>>>> perspective initialization step than hardware setup.
>>>>
>>>> Fixes: 281f1f99cf3a ("PCI: dwc: Detect number of iATU windows")
>>>> Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
>>> This patch causes exynos-pcie to hang during the initialization. It
>>> looks that some resources are not enabled yet, so calling
>>> dw_pcie_iatu_detect() much earlier causes a hang. When I have some 
>>> time,
>>> I will try to identify what is needed to call it properly.
>> Thanks, I dropped it for now.  We can add it back after we figure out
>> what the exynos issue is.
> Thanks, I will try to identify at which point of initialization it is 
> safe to call iATU region detection.

I've just checked and it is enough to move the

dw_pcie_iatu_detect(pci);

after

pp->ops->host_init(pp);

in dw_pcie_host_init() to fix driver operation on Exynos SoCs with the 
$subject patch applied.

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland