[PATCH v3 0/4] PCI: brcmstb: Some minor fixes/features

[PATCH v3 0/4] PCI: brcmstb: Some minor fixes/features

[Jim Quinlan]

v3 -- A change was submitted to [1] to make 'aspm-no-l0s' a general
      property for PCIe devices.  As such, the STB PCIe YAML  file
      merely notes that it may be used.

v2 -- Dropped commit concerning CRS.
   -- Chanded new prop 'brcm,aspm-en-l0s' to 'aspm-no-l0s'.
   -- Capitalize first letter in commit subject line; spelling.

v1 -- original

[1] https://github.com/devicetree-org/dt-schema/blob/master/schemas/pci/pci-bus.yaml

Jim Quinlan (4):
  PCI: brcmstb: Don't clk_put() a managed clock
  PCI: brcmstb: Fix window register offset from 4 to 8
  dt-bindings: PCI: brcmstb: New prop 'aspm-no-l0s'
  PCI: brcmstb: Disable L0s component of ASPM if requested

 .../bindings/pci/brcm,stb-pcie.yaml           |  2 ++
 drivers/pci/controller/pcie-brcmstb.c         | 19 +++++++++++++++----
 2 files changed, 17 insertions(+), 4 deletions(-)

-- 
2.17.1

[PATCH v3 1/4] PCI: brcmstb: Don't clk_put() a managed clock

[Jim Quinlan]

From: Jim Quinlan <jquinlan@broadcom.com>

clk_put() was being invoked on a clock obtained by
devm_clk_get_optional().

Signed-off-by: Jim Quinlan <jquinlan@broadcom.com>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Acked-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
---
 drivers/pci/controller/pcie-brcmstb.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/pci/controller/pcie-brcmstb.c b/drivers/pci/controller/pcie-brcmstb.c
index 6d79d14527a6..454917ee9241 100644
--- a/drivers/pci/controller/pcie-brcmstb.c
+++ b/drivers/pci/controller/pcie-brcmstb.c
@@ -899,7 +899,6 @@ static void __brcm_pcie_remove(struct brcm_pcie *pcie)
 	brcm_msi_remove(pcie);
 	brcm_pcie_turn_off(pcie);
 	clk_disable_unprepare(pcie->clk);
-	clk_put(pcie->clk);
 }
 
 static int brcm_pcie_remove(struct platform_device *pdev)
-- 
2.17.1

[PATCH v3 2/4] PCI: brcmstb: Fix window register offset from 4 to 8

[Jim Quinlan]

From: Jim Quinlan <jquinlan@broadcom.com>

The outbound memory window registers were being referenced
with an incorrect stride offset.  This probably wasn't noticed
previously as there was likely only one such window employed.

Signed-off-by: Jim Quinlan <jquinlan@broadcom.com>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Acked-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>

Fixes: c0452137034b ("PCI: brcmstb: Add Broadcom STB PCIe host controller driver")
---
 drivers/pci/controller/pcie-brcmstb.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/controller/pcie-brcmstb.c b/drivers/pci/controller/pcie-brcmstb.c
index 454917ee9241..5b0dec5971b8 100644
--- a/drivers/pci/controller/pcie-brcmstb.c
+++ b/drivers/pci/controller/pcie-brcmstb.c
@@ -54,11 +54,11 @@
 
 #define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_LO		0x400c
 #define PCIE_MEM_WIN0_LO(win)	\
-		PCIE_MISC_CPU_2_PCIE_MEM_WIN0_LO + ((win) * 4)
+		PCIE_MISC_CPU_2_PCIE_MEM_WIN0_LO + ((win) * 8)
 
 #define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_HI		0x4010
 #define PCIE_MEM_WIN0_HI(win)	\
-		PCIE_MISC_CPU_2_PCIE_MEM_WIN0_HI + ((win) * 4)
+		PCIE_MISC_CPU_2_PCIE_MEM_WIN0_HI + ((win) * 8)
 
 #define PCIE_MISC_RC_BAR1_CONFIG_LO			0x402c
 #define  PCIE_MISC_RC_BAR1_CONFIG_LO_SIZE_MASK		0x1f
-- 
2.17.1

[PATCH v3 3/4] dt-bindings: PCI: brcmstb: New prop 'aspm-no-l0s'

[Jim Quinlan]

From: Jim Quinlan <jquinlan@broadcom.com>

For various reasons, one may want to disable the ASPM L0s
capability.

Signed-off-by: Jim Quinlan <jquinlan@broadcom.com>
---
 Documentation/devicetree/bindings/pci/brcm,stb-pcie.yaml | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/devicetree/bindings/pci/brcm,stb-pcie.yaml b/Documentation/devicetree/bindings/pci/brcm,stb-pcie.yaml
index 77d3e81a437b..8680a0f86c5a 100644
--- a/Documentation/devicetree/bindings/pci/brcm,stb-pcie.yaml
+++ b/Documentation/devicetree/bindings/pci/brcm,stb-pcie.yaml
@@ -56,6 +56,8 @@ properties:
     description: Indicates usage of spread-spectrum clocking.
     type: boolean
 
+  aspm-no-l0s: true
+
 required:
   - reg
   - dma-ranges
-- 
2.17.1

[PATCH v3 4/4] PCI: brcmstb: Disable L0s component of ASPM if requested

[Jim Quinlan]

From: Jim Quinlan <jquinlan@broadcom.com>

Some informal internal experiments has shown that the BrcmSTB ASPM L0s
savings may introduce an undesirable noise signal on some customers'
boards.  In addition, L0s was found lacking in realized power savings,
especially relative to the L1 ASPM component.  This is BrcmSTB's
experience and may not hold for others.  At any rate, if the
'aspm-no-l0s' property is present L0s will be disabled.

Signed-off-by: Jim Quinlan <jquinlan@broadcom.com>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Acked-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
---
 drivers/pci/controller/pcie-brcmstb.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/controller/pcie-brcmstb.c b/drivers/pci/controller/pcie-brcmstb.c
index 5b0dec5971b8..73020b4ff090 100644
--- a/drivers/pci/controller/pcie-brcmstb.c
+++ b/drivers/pci/controller/pcie-brcmstb.c
@@ -41,6 +41,9 @@
 #define PCIE_RC_CFG_PRIV1_ID_VAL3			0x043c
 #define  PCIE_RC_CFG_PRIV1_ID_VAL3_CLASS_CODE_MASK	0xffffff
 
+#define PCIE_RC_CFG_PRIV1_LINK_CAPABILITY			0x04dc
+#define  PCIE_RC_CFG_PRIV1_LINK_CAPABILITY_ASPM_SUPPORT_MASK	0xc00
+
 #define PCIE_RC_DL_MDIO_ADDR				0x1100
 #define PCIE_RC_DL_MDIO_WR_DATA				0x1104
 #define PCIE_RC_DL_MDIO_RD_DATA				0x1108
@@ -693,7 +696,7 @@ static int brcm_pcie_setup(struct brcm_pcie *pcie)
 	int num_out_wins = 0;
 	u16 nlw, cls, lnksta;
 	int i, ret;
-	u32 tmp;
+	u32 tmp, aspm_support;
 
 	/* Reset the bridge */
 	brcm_pcie_bridge_sw_init_set(pcie, 1);
@@ -803,6 +806,15 @@ static int brcm_pcie_setup(struct brcm_pcie *pcie)
 		num_out_wins++;
 	}
 
+	/* Don't advertise L0s capability if 'aspm-no-l0s' */
+	aspm_support = PCIE_LINK_STATE_L1;
+	if (!of_property_read_bool(pcie->np, "aspm-no-l0s"))
+		aspm_support |= PCIE_LINK_STATE_L0S;
+	tmp = readl(base + PCIE_RC_CFG_PRIV1_LINK_CAPABILITY);
+	u32p_replace_bits(&tmp, aspm_support,
+		PCIE_RC_CFG_PRIV1_LINK_CAPABILITY_ASPM_SUPPORT_MASK);
+	writel(tmp, base + PCIE_RC_CFG_PRIV1_LINK_CAPABILITY);
+
 	/*
 	 * For config space accesses on the RC, show the right class for
 	 * a PCIe-PCIe bridge (the default setting is to be EP mode).
-- 
2.17.1

Re: [PATCH v3 1/4] PCI: brcmstb: Don't clk_put() a managed clock

[Florian Fainelli]

On 5/7/2020 1:15 PM, Jim Quinlan wrote:
> From: Jim Quinlan <jquinlan@broadcom.com>
> 
> clk_put() was being invoked on a clock obtained by
> devm_clk_get_optional().
> 
> Signed-off-by: Jim Quinlan <jquinlan@broadcom.com>
> Acked-by: Florian Fainelli <f.fainelli@gmail.com>
> Acked-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>

This one should also have:

Fixes: c0452137034b ("PCI: brcmstb: Add Broadcom STB PCIe host
controller driver")

not sure if Bjorn can add it while applying.
-- 
Florian

Re: [PATCH v3 3/4] dt-bindings: PCI: brcmstb: New prop 'aspm-no-l0s'

[Rob Herring]

On Thu, May 7, 2020 at 3:16 PM Jim Quinlan <james.quinlan@broadcom.com> wrote:
>
> From: Jim Quinlan <jquinlan@broadcom.com>
>
> For various reasons, one may want to disable the ASPM L0s
> capability.
>
> Signed-off-by: Jim Quinlan <jquinlan@broadcom.com>
> ---
>  Documentation/devicetree/bindings/pci/brcm,stb-pcie.yaml | 2 ++
>  1 file changed, 2 insertions(+)

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

Re: [PATCH v3 0/4] PCI: brcmstb: Some minor fixes/features

[Lorenzo Pieralisi]

On Thu, May 07, 2020 at 04:15:39PM -0400, Jim Quinlan wrote:
> v3 -- A change was submitted to [1] to make 'aspm-no-l0s' a general
>       property for PCIe devices.  As such, the STB PCIe YAML  file
>       merely notes that it may be used.
> 
> v2 -- Dropped commit concerning CRS.
>    -- Chanded new prop 'brcm,aspm-en-l0s' to 'aspm-no-l0s'.
>    -- Capitalize first letter in commit subject line; spelling.
> 
> v1 -- original
> 
> [1] https://github.com/devicetree-org/dt-schema/blob/master/schemas/pci/pci-bus.yaml
> 
> Jim Quinlan (4):
>   PCI: brcmstb: Don't clk_put() a managed clock
>   PCI: brcmstb: Fix window register offset from 4 to 8
>   dt-bindings: PCI: brcmstb: New prop 'aspm-no-l0s'
>   PCI: brcmstb: Disable L0s component of ASPM if requested
> 
>  .../bindings/pci/brcm,stb-pcie.yaml           |  2 ++
>  drivers/pci/controller/pcie-brcmstb.c         | 19 +++++++++++++++----
>  2 files changed, 17 insertions(+), 4 deletions(-)

Applied to pci/brcmstb, thanks !

Lorenzo