[PATCH v2 0/2] PCI: designware: let dw_pcie_link_up() beware of LTSSM training bit

[PATCH v2 0/2] PCI: designware: let dw_pcie_link_up() beware of LTSSM training bit

[Jisheng Zhang]

patch1 is a trivial clean up: move the parameters for wait for link
into the core pcie-designware.c

Since link may be UP but still in link training, if so, we can't think
the link is up and operating correctly. So patch2 teaches
dw_pcie_link_up() beware of the PCIE_PHY_DEBUG_R1_LINK_IN_TRAINING bit.

Since v1:
  - add Joao's Ack
  - rebased on v4.8-rc1

Jisheng Zhang (2):
  PCI: designware: mv parameters for wait for link into
    pcie-designware.c
  PCI: designware: let dw_pcie_link_up() beware of LTSSM training bit

 drivers/pci/host/pcie-designware.c | 11 +++++++++--
 drivers/pci/host/pcie-designware.h |  5 -----
 2 files changed, 9 insertions(+), 7 deletions(-)

-- 
2.8.1

[PATCH v2 0/2] PCI: designware: let dw_pcie_link_up() beware of LTSSM training bit

[Jisheng Zhang]

patch1 is a trivial clean up: move the parameters for wait for link
into the core pcie-designware.c

Since link may be UP but still in link training, if so, we can't think
the link is up and operating correctly. So patch2 teaches
dw_pcie_link_up() beware of the PCIE_PHY_DEBUG_R1_LINK_IN_TRAINING bit.

Since v1:
  - add Joao's Ack
  - rebased on v4.8-rc1

Jisheng Zhang (2):
  PCI: designware: mv parameters for wait for link into
    pcie-designware.c
  PCI: designware: let dw_pcie_link_up() beware of LTSSM training bit

 drivers/pci/host/pcie-designware.c | 11 +++++++++--
 drivers/pci/host/pcie-designware.h |  5 -----
 2 files changed, 9 insertions(+), 7 deletions(-)

-- 
2.8.1


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[PATCH v2 0/2] PCI: designware: let dw_pcie_link_up() beware of LTSSM training bit

[Jisheng Zhang]

patch1 is a trivial clean up: move the parameters for wait for link
into the core pcie-designware.c

Since link may be UP but still in link training, if so, we can't think
the link is up and operating correctly. So patch2 teaches
dw_pcie_link_up() beware of the PCIE_PHY_DEBUG_R1_LINK_IN_TRAINING bit.

Since v1:
  - add Joao's Ack
  - rebased on v4.8-rc1

Jisheng Zhang (2):
  PCI: designware: mv parameters for wait for link into
    pcie-designware.c
  PCI: designware: let dw_pcie_link_up() beware of LTSSM training bit

 drivers/pci/host/pcie-designware.c | 11 +++++++++--
 drivers/pci/host/pcie-designware.h |  5 -----
 2 files changed, 9 insertions(+), 7 deletions(-)

-- 
2.8.1

[PATCH v2 1/2] PCI: designware: mv parameters for wait for link into pcie-designware.c

[Jisheng Zhang]

These parameters are only used in the core pcie-designware.c, let's
move them to the core driver.

Signed-off-by: Jisheng Zhang <jszhang@marvell.com>
---
 drivers/pci/host/pcie-designware.c | 5 +++++
 drivers/pci/host/pcie-designware.h | 5 -----
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/pci/host/pcie-designware.c b/drivers/pci/host/pcie-designware.c
index 12afce1..24a16dd 100644
--- a/drivers/pci/host/pcie-designware.c
+++ b/drivers/pci/host/pcie-designware.c
@@ -75,6 +75,11 @@
 #define PCIE_PHY_DEBUG_R1		(PLR_OFFSET + 0x2c)
 #define PCIE_PHY_DEBUG_R1_LINK_UP	0x00000010
 
+/* Parameters for the waiting for link up routine */
+#define LINK_WAIT_MAX_RETRIES		10
+#define LINK_WAIT_USLEEP_MIN		90000
+#define LINK_WAIT_USLEEP_MAX		100000
+
 static struct pci_ops dw_pcie_ops;
 
 int dw_pcie_cfg_read(void __iomem *addr, int size, u32 *val)
diff --git a/drivers/pci/host/pcie-designware.h b/drivers/pci/host/pcie-designware.h
index f437f9b..384e79b 100644
--- a/drivers/pci/host/pcie-designware.h
+++ b/drivers/pci/host/pcie-designware.h
@@ -22,11 +22,6 @@
 #define MAX_MSI_IRQS			32
 #define MAX_MSI_CTRLS			(MAX_MSI_IRQS / 32)
 
-/* Parameters for the waiting for link up routine */
-#define LINK_WAIT_MAX_RETRIES		10
-#define LINK_WAIT_USLEEP_MIN		90000
-#define LINK_WAIT_USLEEP_MAX		100000
-
 struct pcie_port {
 	struct device		*dev;
 	u8			root_bus_nr;
-- 
2.8.1

[PATCH v2 1/2] PCI: designware: mv parameters for wait for link into pcie-designware.c

[Jisheng Zhang]

These parameters are only used in the core pcie-designware.c, let's
move them to the core driver.

Signed-off-by: Jisheng Zhang <jszhang@marvell.com>
---
 drivers/pci/host/pcie-designware.c | 5 +++++
 drivers/pci/host/pcie-designware.h | 5 -----
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/pci/host/pcie-designware.c b/drivers/pci/host/pcie-designware.c
index 12afce1..24a16dd 100644
--- a/drivers/pci/host/pcie-designware.c
+++ b/drivers/pci/host/pcie-designware.c
@@ -75,6 +75,11 @@
 #define PCIE_PHY_DEBUG_R1		(PLR_OFFSET + 0x2c)
 #define PCIE_PHY_DEBUG_R1_LINK_UP	0x00000010
 
+/* Parameters for the waiting for link up routine */
+#define LINK_WAIT_MAX_RETRIES		10
+#define LINK_WAIT_USLEEP_MIN		90000
+#define LINK_WAIT_USLEEP_MAX		100000
+
 static struct pci_ops dw_pcie_ops;
 
 int dw_pcie_cfg_read(void __iomem *addr, int size, u32 *val)
diff --git a/drivers/pci/host/pcie-designware.h b/drivers/pci/host/pcie-designware.h
index f437f9b..384e79b 100644
--- a/drivers/pci/host/pcie-designware.h
+++ b/drivers/pci/host/pcie-designware.h
@@ -22,11 +22,6 @@
 #define MAX_MSI_IRQS			32
 #define MAX_MSI_CTRLS			(MAX_MSI_IRQS / 32)
 
-/* Parameters for the waiting for link up routine */
-#define LINK_WAIT_MAX_RETRIES		10
-#define LINK_WAIT_USLEEP_MIN		90000
-#define LINK_WAIT_USLEEP_MAX		100000
-
 struct pcie_port {
 	struct device		*dev;
 	u8			root_bus_nr;
-- 
2.8.1


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[PATCH v2 1/2] PCI: designware: mv parameters for wait for link into pcie-designware.c

[Jisheng Zhang]

These parameters are only used in the core pcie-designware.c, let's
move them to the core driver.

Signed-off-by: Jisheng Zhang <jszhang@marvell.com>
---
 drivers/pci/host/pcie-designware.c | 5 +++++
 drivers/pci/host/pcie-designware.h | 5 -----
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/pci/host/pcie-designware.c b/drivers/pci/host/pcie-designware.c
index 12afce1..24a16dd 100644
--- a/drivers/pci/host/pcie-designware.c
+++ b/drivers/pci/host/pcie-designware.c
@@ -75,6 +75,11 @@
 #define PCIE_PHY_DEBUG_R1		(PLR_OFFSET + 0x2c)
 #define PCIE_PHY_DEBUG_R1_LINK_UP	0x00000010
 
+/* Parameters for the waiting for link up routine */
+#define LINK_WAIT_MAX_RETRIES		10
+#define LINK_WAIT_USLEEP_MIN		90000
+#define LINK_WAIT_USLEEP_MAX		100000
+
 static struct pci_ops dw_pcie_ops;
 
 int dw_pcie_cfg_read(void __iomem *addr, int size, u32 *val)
diff --git a/drivers/pci/host/pcie-designware.h b/drivers/pci/host/pcie-designware.h
index f437f9b..384e79b 100644
--- a/drivers/pci/host/pcie-designware.h
+++ b/drivers/pci/host/pcie-designware.h
@@ -22,11 +22,6 @@
 #define MAX_MSI_IRQS			32
 #define MAX_MSI_CTRLS			(MAX_MSI_IRQS / 32)
 
-/* Parameters for the waiting for link up routine */
-#define LINK_WAIT_MAX_RETRIES		10
-#define LINK_WAIT_USLEEP_MIN		90000
-#define LINK_WAIT_USLEEP_MAX		100000
-
 struct pcie_port {
 	struct device		*dev;
 	u8			root_bus_nr;
-- 
2.8.1

[PATCH v2 2/2] PCI: designware: let dw_pcie_link_up() beware of LTSSM training bit

[Jisheng Zhang]

The link may be UP but still in link training. In this case, we can't
think the link is up and operating correctly. So we need to teach
dw_pcie_link_up() beware of the PCIE_PHY_DEBUG_R1_LINK_IN_TRAINING bit.

This patch also rewrite PCIE_PHY_DEBUG_R1_LINK_UP definition so that
it's consistent with other MACROS.

Signed-off-by: Jisheng Zhang <jszhang@marvell.com>
Acked-by: Joao Pinto <jpinto@synopsys.com>
---
 drivers/pci/host/pcie-designware.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/host/pcie-designware.c b/drivers/pci/host/pcie-designware.c
index 24a16dd..6cc21bb 100644
--- a/drivers/pci/host/pcie-designware.c
+++ b/drivers/pci/host/pcie-designware.c
@@ -73,7 +73,8 @@
 /* PCIe Port Logic registers */
 #define PLR_OFFSET			0x700
 #define PCIE_PHY_DEBUG_R1		(PLR_OFFSET + 0x2c)
-#define PCIE_PHY_DEBUG_R1_LINK_UP	0x00000010
+#define PCIE_PHY_DEBUG_R1_LINK_UP	(0x1 << 4)
+#define PCIE_PHY_DEBUG_R1_LINK_IN_TRAINING	(0x1 << 29)
 
 /* Parameters for the waiting for link up routine */
 #define LINK_WAIT_MAX_RETRIES		10
@@ -417,7 +418,8 @@ int dw_pcie_link_up(struct pcie_port *pp)
 		return pp->ops->link_up(pp);
 
 	val = readl(pp->dbi_base + PCIE_PHY_DEBUG_R1);
-	return val & PCIE_PHY_DEBUG_R1_LINK_UP;
+	return ((val & PCIE_PHY_DEBUG_R1_LINK_UP) &&
+		(!(val & PCIE_PHY_DEBUG_R1_LINK_IN_TRAINING)));
 }
 
 static int dw_pcie_msi_map(struct irq_domain *domain, unsigned int irq,
-- 
2.8.1

[PATCH v2 2/2] PCI: designware: let dw_pcie_link_up() beware of LTSSM training bit

[Jisheng Zhang]

The link may be UP but still in link training. In this case, we can't
think the link is up and operating correctly. So we need to teach
dw_pcie_link_up() beware of the PCIE_PHY_DEBUG_R1_LINK_IN_TRAINING bit.

This patch also rewrite PCIE_PHY_DEBUG_R1_LINK_UP definition so that
it's consistent with other MACROS.

Signed-off-by: Jisheng Zhang <jszhang@marvell.com>
Acked-by: Joao Pinto <jpinto@synopsys.com>
---
 drivers/pci/host/pcie-designware.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/host/pcie-designware.c b/drivers/pci/host/pcie-designware.c
index 24a16dd..6cc21bb 100644
--- a/drivers/pci/host/pcie-designware.c
+++ b/drivers/pci/host/pcie-designware.c
@@ -73,7 +73,8 @@
 /* PCIe Port Logic registers */
 #define PLR_OFFSET			0x700
 #define PCIE_PHY_DEBUG_R1		(PLR_OFFSET + 0x2c)
-#define PCIE_PHY_DEBUG_R1_LINK_UP	0x00000010
+#define PCIE_PHY_DEBUG_R1_LINK_UP	(0x1 << 4)
+#define PCIE_PHY_DEBUG_R1_LINK_IN_TRAINING	(0x1 << 29)
 
 /* Parameters for the waiting for link up routine */
 #define LINK_WAIT_MAX_RETRIES		10
@@ -417,7 +418,8 @@ int dw_pcie_link_up(struct pcie_port *pp)
 		return pp->ops->link_up(pp);
 
 	val = readl(pp->dbi_base + PCIE_PHY_DEBUG_R1);
-	return val & PCIE_PHY_DEBUG_R1_LINK_UP;
+	return ((val & PCIE_PHY_DEBUG_R1_LINK_UP) &&
+		(!(val & PCIE_PHY_DEBUG_R1_LINK_IN_TRAINING)));
 }
 
 static int dw_pcie_msi_map(struct irq_domain *domain, unsigned int irq,
-- 
2.8.1


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[PATCH v2 2/2] PCI: designware: let dw_pcie_link_up() beware of LTSSM training bit

[Jisheng Zhang]

The link may be UP but still in link training. In this case, we can't
think the link is up and operating correctly. So we need to teach
dw_pcie_link_up() beware of the PCIE_PHY_DEBUG_R1_LINK_IN_TRAINING bit.

This patch also rewrite PCIE_PHY_DEBUG_R1_LINK_UP definition so that
it's consistent with other MACROS.

Signed-off-by: Jisheng Zhang <jszhang@marvell.com>
Acked-by: Joao Pinto <jpinto@synopsys.com>
---
 drivers/pci/host/pcie-designware.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/host/pcie-designware.c b/drivers/pci/host/pcie-designware.c
index 24a16dd..6cc21bb 100644
--- a/drivers/pci/host/pcie-designware.c
+++ b/drivers/pci/host/pcie-designware.c
@@ -73,7 +73,8 @@
 /* PCIe Port Logic registers */
 #define PLR_OFFSET			0x700
 #define PCIE_PHY_DEBUG_R1		(PLR_OFFSET + 0x2c)
-#define PCIE_PHY_DEBUG_R1_LINK_UP	0x00000010
+#define PCIE_PHY_DEBUG_R1_LINK_UP	(0x1 << 4)
+#define PCIE_PHY_DEBUG_R1_LINK_IN_TRAINING	(0x1 << 29)
 
 /* Parameters for the waiting for link up routine */
 #define LINK_WAIT_MAX_RETRIES		10
@@ -417,7 +418,8 @@ int dw_pcie_link_up(struct pcie_port *pp)
 		return pp->ops->link_up(pp);
 
 	val = readl(pp->dbi_base + PCIE_PHY_DEBUG_R1);
-	return val & PCIE_PHY_DEBUG_R1_LINK_UP;
+	return ((val & PCIE_PHY_DEBUG_R1_LINK_UP) &&
+		(!(val & PCIE_PHY_DEBUG_R1_LINK_IN_TRAINING)));
 }
 
 static int dw_pcie_msi_map(struct irq_domain *domain, unsigned int irq,
-- 
2.8.1

Re: [PATCH v2 0/2] PCI: designware: let dw_pcie_link_up() beware of LTSSM training bit

[Jisheng Zhang]

On Wed, 10 Aug 2016 18:07:01 +0800 Jisheng Zhang wrote:

> patch1 is a trivial clean up: move the parameters for wait for link
> into the core pcie-designware.c
> 
> Since link may be UP but still in link training, if so, we can't think
> the link is up and operating correctly. So patch2 teaches
> dw_pcie_link_up() beware of the PCIE_PHY_DEBUG_R1_LINK_IN_TRAINING bit.

hmm, there's one accident with my email system, the v2 series is sent twice

Sorry for inconvenience,
Jisheng

> 
> Since v1:
>   - add Joao's Ack
>   - rebased on v4.8-rc1
> 
> Jisheng Zhang (2):
>   PCI: designware: mv parameters for wait for link into
>     pcie-designware.c
>   PCI: designware: let dw_pcie_link_up() beware of LTSSM training bit
> 
>  drivers/pci/host/pcie-designware.c | 11 +++++++++--
>  drivers/pci/host/pcie-designware.h |  5 -----
>  2 files changed, 9 insertions(+), 7 deletions(-)
> 

Re: [PATCH v2 0/2] PCI: designware: let dw_pcie_link_up() beware of LTSSM training bit

[Jisheng Zhang]

On Wed, 10 Aug 2016 18:07:01 +0800 Jisheng Zhang wrote:

> patch1 is a trivial clean up: move the parameters for wait for link
> into the core pcie-designware.c
> 
> Since link may be UP but still in link training, if so, we can't think
> the link is up and operating correctly. So patch2 teaches
> dw_pcie_link_up() beware of the PCIE_PHY_DEBUG_R1_LINK_IN_TRAINING bit.

hmm, there's one accident with my email system, the v2 series is sent twice

Sorry for inconvenience,
Jisheng

> 
> Since v1:
>   - add Joao's Ack
>   - rebased on v4.8-rc1
> 
> Jisheng Zhang (2):
>   PCI: designware: mv parameters for wait for link into
>     pcie-designware.c
>   PCI: designware: let dw_pcie_link_up() beware of LTSSM training bit
> 
>  drivers/pci/host/pcie-designware.c | 11 +++++++++--
>  drivers/pci/host/pcie-designware.h |  5 -----
>  2 files changed, 9 insertions(+), 7 deletions(-)
> 


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[PATCH v2 0/2] PCI: designware: let dw_pcie_link_up() beware of LTSSM training bit

[Jisheng Zhang]

On Wed, 10 Aug 2016 18:07:01 +0800 Jisheng Zhang wrote:

> patch1 is a trivial clean up: move the parameters for wait for link
> into the core pcie-designware.c
> 
> Since link may be UP but still in link training, if so, we can't think
> the link is up and operating correctly. So patch2 teaches
> dw_pcie_link_up() beware of the PCIE_PHY_DEBUG_R1_LINK_IN_TRAINING bit.

hmm, there's one accident with my email system, the v2 series is sent twice

Sorry for inconvenience,
Jisheng

> 
> Since v1:
>   - add Joao's Ack
>   - rebased on v4.8-rc1
> 
> Jisheng Zhang (2):
>   PCI: designware: mv parameters for wait for link into
>     pcie-designware.c
>   PCI: designware: let dw_pcie_link_up() beware of LTSSM training bit
> 
>  drivers/pci/host/pcie-designware.c | 11 +++++++++--
>  drivers/pci/host/pcie-designware.h |  5 -----
>  2 files changed, 9 insertions(+), 7 deletions(-)
> 

Re: [PATCH v2 0/2] PCI: designware: let dw_pcie_link_up() beware of LTSSM training bit

[Bjorn Helgaas]

On Wed, Aug 10, 2016 at 06:07:01PM +0800, Jisheng Zhang wrote:
> patch1 is a trivial clean up: move the parameters for wait for link
> into the core pcie-designware.c
> 
> Since link may be UP but still in link training, if so, we can't think
> the link is up and operating correctly. So patch2 teaches
> dw_pcie_link_up() beware of the PCIE_PHY_DEBUG_R1_LINK_IN_TRAINING bit.
> 
> Since v1:
>   - add Joao's Ack
>   - rebased on v4.8-rc1
> 
> Jisheng Zhang (2):
>   PCI: designware: mv parameters for wait for link into
>     pcie-designware.c
>   PCI: designware: let dw_pcie_link_up() beware of LTSSM training bit
> 
>  drivers/pci/host/pcie-designware.c | 11 +++++++++--
>  drivers/pci/host/pcie-designware.h |  5 -----
>  2 files changed, 9 insertions(+), 7 deletions(-)

Applied to pci/host-designware for v4.9, thanks, Jisheng.

[PATCH v2 0/2] PCI: designware: let dw_pcie_link_up() beware of LTSSM training bit

[Bjorn Helgaas]

On Wed, Aug 10, 2016 at 06:07:01PM +0800, Jisheng Zhang wrote:
> patch1 is a trivial clean up: move the parameters for wait for link
> into the core pcie-designware.c
> 
> Since link may be UP but still in link training, if so, we can't think
> the link is up and operating correctly. So patch2 teaches
> dw_pcie_link_up() beware of the PCIE_PHY_DEBUG_R1_LINK_IN_TRAINING bit.
> 
> Since v1:
>   - add Joao's Ack
>   - rebased on v4.8-rc1
> 
> Jisheng Zhang (2):
>   PCI: designware: mv parameters for wait for link into
>     pcie-designware.c
>   PCI: designware: let dw_pcie_link_up() beware of LTSSM training bit
> 
>  drivers/pci/host/pcie-designware.c | 11 +++++++++--
>  drivers/pci/host/pcie-designware.h |  5 -----
>  2 files changed, 9 insertions(+), 7 deletions(-)

Applied to pci/host-designware for v4.9, thanks, Jisheng.

[PATCH v2 0/2] PCI: designware: let dw_pcie_link_up() beware of LTSSM training bit

[Jisheng Zhang]

patch1 is a trivial clean up: move the parameters for wait for link
into the core pcie-designware.c

Since link may be UP but still in link training, if so, we can't think
the link is up and operating correctly. So patch2 teaches
dw_pcie_link_up() beware of the PCIE_PHY_DEBUG_R1_LINK_IN_TRAINING bit.

Since v1:
  - add Joao's Ack
  - rebased on v4.8-rc1

Jisheng Zhang (2):
  PCI: designware: mv parameters for wait for link into
    pcie-designware.c
  PCI: designware: let dw_pcie_link_up() beware of LTSSM training bit

 drivers/pci/host/pcie-designware.c | 11 +++++++++--
 drivers/pci/host/pcie-designware.h |  5 -----
 2 files changed, 9 insertions(+), 7 deletions(-)

-- 
2.8.1

[PATCH v2 0/2] PCI: designware: let dw_pcie_link_up() beware of LTSSM training bit

[Jisheng Zhang]

patch1 is a trivial clean up: move the parameters for wait for link
into the core pcie-designware.c

Since link may be UP but still in link training, if so, we can't think
the link is up and operating correctly. So patch2 teaches
dw_pcie_link_up() beware of the PCIE_PHY_DEBUG_R1_LINK_IN_TRAINING bit.

Since v1:
  - add Joao's Ack
  - rebased on v4.8-rc1

Jisheng Zhang (2):
  PCI: designware: mv parameters for wait for link into
    pcie-designware.c
  PCI: designware: let dw_pcie_link_up() beware of LTSSM training bit

 drivers/pci/host/pcie-designware.c | 11 +++++++++--
 drivers/pci/host/pcie-designware.h |  5 -----
 2 files changed, 9 insertions(+), 7 deletions(-)

-- 
2.8.1


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[PATCH v2 0/2] PCI: designware: let dw_pcie_link_up() beware of LTSSM training bit

[Jisheng Zhang]

patch1 is a trivial clean up: move the parameters for wait for link
into the core pcie-designware.c

Since link may be UP but still in link training, if so, we can't think
the link is up and operating correctly. So patch2 teaches
dw_pcie_link_up() beware of the PCIE_PHY_DEBUG_R1_LINK_IN_TRAINING bit.

Since v1:
  - add Joao's Ack
  - rebased on v4.8-rc1

Jisheng Zhang (2):
  PCI: designware: mv parameters for wait for link into
    pcie-designware.c
  PCI: designware: let dw_pcie_link_up() beware of LTSSM training bit

 drivers/pci/host/pcie-designware.c | 11 +++++++++--
 drivers/pci/host/pcie-designware.h |  5 -----
 2 files changed, 9 insertions(+), 7 deletions(-)

-- 
2.8.1