[PATCH v10 0/5] PCI: add 4x lane support for pci-j721e controllers

[PATCH v10 0/5] PCI: add 4x lane support for pci-j721e controllers

[Achal Verma]

Adding of additional support to Cadence PCIe controller (i.e. pci-j721e.c)
for up to 4x lanes, and reworking of driver to define maximum lanes per
board configuration.

Changes from v1:
* Reworked 'PCI: j721e: Add PCIe 4x lane selection support' to not cause
  regressions on 1-2x lane platforms

Changes from v2:
* Correct dev_warn format string from %d to %u since lane count is a
  unsigned integer
* Update CC list

Changes from v3:
* Use the max_lanes setting per chip for the mask size required since
  bootloader could have set num_lanes to a higher value that the
  device tree which would leave in an undefined state
* Reorder patches do the previous change to not break bisect
* Remove line breaking for dev_warn to allow better grepping and since
  no strict 80 columns anymore

Changes from v4:
* Correct invalid settings for j7200 PCIe RC + EP
* Add j784s4 configuration for selection of 4x lanes

Changes from v5:
* Dropped 'PCI: j721e: Add warnings on num-lanes misconfiguration' patch
  from series
* Reworded 'PCI: j721e: Add per platform maximum lane settings' commit
  message
* Added yaml documentation and schema checks for ti,j721e-pci-* lane
  checking

Changes from v6:
* Fix wordwrapping in commit messages from ~65 columns to correct 75
  columns
* Re-ran get_maintainers.pl to add missing maintainers in CC

Changes from v7:
* Addressed review comments in ti,j721e-pci-ep.yaml and
  ti,j721e-pci-host.yaml from v6
* Added warn message if num-lanes property value is invalid.
* Addressed build issue reported in
  https://lore.kernel.org/all/202211260346.4JvNnDdc-lkp@intel.com/

Changes from v8:
* Use "const: 1" in ti,j721e-pci-ep.yaml and ti,j721e-pci-host.yaml
  when num-lanes min and max values are equal.

Changes from v9:
* Rebase on next-20230315

Matt Ranostay (5):
  dt-bindings: PCI: ti,j721e-pci-*: add checks for num-lanes
  PCI: j721e: Add per platform maximum lane settings
  PCI: j721e: Add PCIe 4x lane selection support
  dt-bindings: PCI: ti,j721e-pci-*: add j784s4-pci-* compatible strings
  PCI: j721e: add j784s4 PCIe configuration

 .../bindings/pci/ti,j721e-pci-ep.yaml         | 39 ++++++++++++++--
 .../bindings/pci/ti,j721e-pci-host.yaml       | 39 ++++++++++++++--
 drivers/pci/controller/cadence/pci-j721e.c    | 45 ++++++++++++++++---
 3 files changed, 112 insertions(+), 11 deletions(-)

-- 
2.25.1

[PATCH v10 1/5] dt-bindings: PCI: ti,j721e-pci-*: add checks for num-lanes

[Achal Verma]

From: Matt Ranostay <mranostay@ti.com>

Add num-lanes schema checks based on compatible string on available lanes
for that platform.

Signed-off-by: Matt Ranostay <mranostay@ti.com>
Signed-off-by: Achal Verma <a-verma1@ti.com>
---
 .../bindings/pci/ti,j721e-pci-ep.yaml         | 27 ++++++++++++++++---
 .../bindings/pci/ti,j721e-pci-host.yaml       | 27 ++++++++++++++++---
 2 files changed, 48 insertions(+), 6 deletions(-)

diff --git a/Documentation/devicetree/bindings/pci/ti,j721e-pci-ep.yaml b/Documentation/devicetree/bindings/pci/ti,j721e-pci-ep.yaml
index 10e6eabdff53..32e0c70ed801 100644
--- a/Documentation/devicetree/bindings/pci/ti,j721e-pci-ep.yaml
+++ b/Documentation/devicetree/bindings/pci/ti,j721e-pci-ep.yaml
@@ -10,9 +10,6 @@ title: TI J721E PCI EP (PCIe Wrapper)
 maintainers:
   - Kishon Vijay Abraham I <kishon@ti.com>
 
-allOf:
-  - $ref: "cdns-pcie-ep.yaml#"
-
 properties:
   compatible:
     oneOf:
@@ -65,6 +62,30 @@ properties:
     items:
       - const: link_state
 
+allOf:
+  - $ref: cdns-pcie-ep.yaml#
+  - if:
+      properties:
+        compatible:
+          enum:
+            - ti,am64-pcie-ep
+    then:
+      properties:
+        num-lanes:
+          const: 1
+
+  - if:
+      properties:
+        compatible:
+          enum:
+            - ti,j7200-pcie-ep
+            - ti,j721e-pcie-ep
+    then:
+      properties:
+        num-lanes:
+          minimum: 1
+          maximum: 2
+
 required:
   - compatible
   - reg
diff --git a/Documentation/devicetree/bindings/pci/ti,j721e-pci-host.yaml b/Documentation/devicetree/bindings/pci/ti,j721e-pci-host.yaml
index 3d7aee97353a..2547088304e5 100644
--- a/Documentation/devicetree/bindings/pci/ti,j721e-pci-host.yaml
+++ b/Documentation/devicetree/bindings/pci/ti,j721e-pci-host.yaml
@@ -10,9 +10,6 @@ title: TI J721E PCI Host (PCIe Wrapper)
 maintainers:
   - Kishon Vijay Abraham I <kishon@ti.com>
 
-allOf:
-  - $ref: "cdns-pcie-host.yaml#"
-
 properties:
   compatible:
     oneOf:
@@ -94,6 +91,30 @@ properties:
       interrupts:
         maxItems: 1
 
+allOf:
+  - $ref: cdns-pcie-host.yaml#
+  - if:
+      properties:
+        compatible:
+          enum:
+            - ti,am64-pcie-host
+    then:
+      properties:
+        num-lanes:
+          const: 1
+
+  - if:
+      properties:
+        compatible:
+          enum:
+            - ti,j7200-pcie-host
+            - ti,j721e-pcie-host
+    then:
+      properties:
+        num-lanes:
+          minimum: 1
+          maximum: 2
+
 required:
   - compatible
   - reg
-- 
2.25.1

Re: [PATCH v10 1/5] dt-bindings: PCI: ti,j721e-pci-*: add checks for num-lanes

[Krzysztof Kozlowski]

On 16/03/2023 08:12, Achal Verma wrote:
> From: Matt Ranostay <mranostay@ti.com>
> 
> Add num-lanes schema checks based on compatible string on available lanes
> for that platform.
> 
> Signed-off-by: Matt Ranostay <mranostay@ti.com>
> Signed-off-by: Achal Verma <a-verma1@ti.com>
> ---

Please use scripts/get_maintainers.pl to get a list of necessary people
and lists to CC.  It might happen, that command when run on an older
kernel, gives you outdated entries.  Therefore please be sure you base
your patches on recent Linux kernel.

Since you skipped important  DT list, there will be no checks executed
here. It's a NAK unfortunately. :(

Best regards,
Krzysztof

Re: [EXTERNAL] Re: [PATCH v10 1/5] dt-bindings: PCI: ti, j721e-pci-*: add checks for num-lanes

[Verma, Achal]

On 3/16/2023 5:01 PM, Krzysztof Kozlowski wrote:
> On 16/03/2023 08:12, Achal Verma wrote:
>> From: Matt Ranostay <mranostay@ti.com>
>>
>> Add num-lanes schema checks based on compatible string on available lanes
>> for that platform.
>>
>> Signed-off-by: Matt Ranostay <mranostay@ti.com>
>> Signed-off-by: Achal Verma <a-verma1@ti.com>
>> ---
> 
> Please use scripts/get_maintainers.pl to get a list of necessary people
> and lists to CC.  It might happen, that command when run on an older
> kernel, gives you outdated entries.  Therefore please be sure you base
> your patches on recent Linux kernel.
> 
> Since you skipped important  DT list, there will be no checks executed
> here. It's a NAK unfortunately. :(
> 
> Best regards,
> Krzysztof
Sorry for this, I will resend the series with updated email list and
same version.

Thanks,
Achal Verma
> 

[PATCH v10 2/5] PCI: j721e: Add per platform maximum lane settings

[Achal Verma]

From: Matt Ranostay <mranostay@ti.com>

Various platforms have different maximum amount of lanes that can be
selected. Add max_lanes to struct j721e_pcie to allow for detection of this
which is needed to calculate the needed bitmask size for the possible lane
count.

Signed-off-by: Matt Ranostay <mranostay@ti.com>
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
Signed-off-by: Achal Verma <a-verma1@ti.com>
---
 drivers/pci/controller/cadence/pci-j721e.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/drivers/pci/controller/cadence/pci-j721e.c b/drivers/pci/controller/cadence/pci-j721e.c
index cc83a8925ce0..f4dc2c5abedb 100644
--- a/drivers/pci/controller/cadence/pci-j721e.c
+++ b/drivers/pci/controller/cadence/pci-j721e.c
@@ -47,8 +47,6 @@ enum link_status {
 
 #define GENERATION_SEL_MASK		GENMASK(1, 0)
 
-#define MAX_LANES			2
-
 struct j721e_pcie {
 	struct cdns_pcie	*cdns_pcie;
 	struct clk		*refclk;
@@ -71,6 +69,7 @@ struct j721e_pcie_data {
 	unsigned int		quirk_disable_flr:1;
 	u32			linkdown_irq_regfield;
 	unsigned int		byte_access_allowed:1;
+	unsigned int		max_lanes;
 };
 
 static inline u32 j721e_pcie_user_readl(struct j721e_pcie *pcie, u32 offset)
@@ -290,11 +289,13 @@ static const struct j721e_pcie_data j721e_pcie_rc_data = {
 	.quirk_retrain_flag = true,
 	.byte_access_allowed = false,
 	.linkdown_irq_regfield = LINK_DOWN,
+	.max_lanes = 2,
 };
 
 static const struct j721e_pcie_data j721e_pcie_ep_data = {
 	.mode = PCI_MODE_EP,
 	.linkdown_irq_regfield = LINK_DOWN,
+	.max_lanes = 2,
 };
 
 static const struct j721e_pcie_data j7200_pcie_rc_data = {
@@ -302,23 +303,27 @@ static const struct j721e_pcie_data j7200_pcie_rc_data = {
 	.quirk_detect_quiet_flag = true,
 	.linkdown_irq_regfield = J7200_LINK_DOWN,
 	.byte_access_allowed = true,
+	.max_lanes = 2,
 };
 
 static const struct j721e_pcie_data j7200_pcie_ep_data = {
 	.mode = PCI_MODE_EP,
 	.quirk_detect_quiet_flag = true,
 	.quirk_disable_flr = true,
+	.max_lanes = 2,
 };
 
 static const struct j721e_pcie_data am64_pcie_rc_data = {
 	.mode = PCI_MODE_RC,
 	.linkdown_irq_regfield = J7200_LINK_DOWN,
 	.byte_access_allowed = true,
+	.max_lanes = 1,
 };
 
 static const struct j721e_pcie_data am64_pcie_ep_data = {
 	.mode = PCI_MODE_EP,
 	.linkdown_irq_regfield = J7200_LINK_DOWN,
+	.max_lanes = 1,
 };
 
 static const struct of_device_id of_j721e_pcie_match[] = {
@@ -432,8 +437,10 @@ static int j721e_pcie_probe(struct platform_device *pdev)
 	pcie->user_cfg_base = base;
 
 	ret = of_property_read_u32(node, "num-lanes", &num_lanes);
-	if (ret || num_lanes > MAX_LANES)
+	if (ret || num_lanes > data->max_lanes) {
+		dev_warn(dev, "num-lanes property not provided or invalid, setting num-lanes to 1\n");
 		num_lanes = 1;
+	}
 	pcie->num_lanes = num_lanes;
 
 	if (dma_set_mask_and_coherent(dev, DMA_BIT_MASK(48)))
-- 
2.25.1

[PATCH v10 3/5] PCI: j721e: Add PCIe 4x lane selection support

[Achal Verma]

From: Matt Ranostay <mranostay@ti.com>

Add support for setting of two-bit field that allows selection of 4x lane
PCIe which was previously limited to only 2x lanes.

Signed-off-by: Matt Ranostay <mranostay@ti.com>
Reviewed-by: Vignesh Raghavendra <vigneshr@ti.com>
Reviewed-by: Roger Quadros <rogerq@kernel.org>
Signed-off-by: Achal Verma <a-verma1@ti.com>
---
 drivers/pci/controller/cadence/pci-j721e.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/controller/cadence/pci-j721e.c b/drivers/pci/controller/cadence/pci-j721e.c
index f4dc2c5abedb..58dcac9021e4 100644
--- a/drivers/pci/controller/cadence/pci-j721e.c
+++ b/drivers/pci/controller/cadence/pci-j721e.c
@@ -42,7 +42,6 @@ enum link_status {
 };
 
 #define J721E_MODE_RC			BIT(7)
-#define LANE_COUNT_MASK			BIT(8)
 #define LANE_COUNT(n)			((n) << 8)
 
 #define GENERATION_SEL_MASK		GENMASK(1, 0)
@@ -52,6 +51,7 @@ struct j721e_pcie {
 	struct clk		*refclk;
 	u32			mode;
 	u32			num_lanes;
+	u32			max_lanes;
 	void __iomem		*user_cfg_base;
 	void __iomem		*intd_cfg_base;
 	u32			linkdown_irq_regfield;
@@ -205,11 +205,15 @@ static int j721e_pcie_set_lane_count(struct j721e_pcie *pcie,
 {
 	struct device *dev = pcie->cdns_pcie->dev;
 	u32 lanes = pcie->num_lanes;
+	u32 mask = BIT(8);
 	u32 val = 0;
 	int ret;
 
+	if (pcie->max_lanes == 4)
+		mask = GENMASK(9, 8);
+
 	val = LANE_COUNT(lanes - 1);
-	ret = regmap_update_bits(syscon, offset, LANE_COUNT_MASK, val);
+	ret = regmap_update_bits(syscon, offset, mask, val);
 	if (ret)
 		dev_err(dev, "failed to set link count\n");
 
@@ -441,7 +445,9 @@ static int j721e_pcie_probe(struct platform_device *pdev)
 		dev_warn(dev, "num-lanes property not provided or invalid, setting num-lanes to 1\n");
 		num_lanes = 1;
 	}
+
 	pcie->num_lanes = num_lanes;
+	pcie->max_lanes = data->max_lanes;
 
 	if (dma_set_mask_and_coherent(dev, DMA_BIT_MASK(48)))
 		return -EINVAL;
-- 
2.25.1

[PATCH v10 4/5] dt-bindings: PCI: ti,j721e-pci-*: add j784s4-pci-* compatible strings

[Achal Verma]

From: Matt Ranostay <mranostay@ti.com>

Add definition for j784s4-pci-ep + j784s4-pci-host devices along with
schema checks for num-lanes.

Signed-off-by: Matt Ranostay <mranostay@ti.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Achal Verma <a-verma1@ti.com>
---
 .../devicetree/bindings/pci/ti,j721e-pci-ep.yaml     | 12 ++++++++++++
 .../devicetree/bindings/pci/ti,j721e-pci-host.yaml   | 12 ++++++++++++
 2 files changed, 24 insertions(+)

diff --git a/Documentation/devicetree/bindings/pci/ti,j721e-pci-ep.yaml b/Documentation/devicetree/bindings/pci/ti,j721e-pci-ep.yaml
index 32e0c70ed801..d2fbf1f7aa54 100644
--- a/Documentation/devicetree/bindings/pci/ti,j721e-pci-ep.yaml
+++ b/Documentation/devicetree/bindings/pci/ti,j721e-pci-ep.yaml
@@ -14,6 +14,7 @@ properties:
   compatible:
     oneOf:
       - const: ti,j721e-pcie-ep
+      - const: ti,j784s4-pcie-ep
       - description: PCIe EP controller in AM64
         items:
           - const: ti,am64-pcie-ep
@@ -86,6 +87,17 @@ allOf:
           minimum: 1
           maximum: 2
 
+  - if:
+      properties:
+        compatible:
+          enum:
+            - ti,j784s4-pcie-ep
+    then:
+      properties:
+        num-lanes:
+          minimum: 1
+          maximum: 4
+
 required:
   - compatible
   - reg
diff --git a/Documentation/devicetree/bindings/pci/ti,j721e-pci-host.yaml b/Documentation/devicetree/bindings/pci/ti,j721e-pci-host.yaml
index 2547088304e5..e41d6f403493 100644
--- a/Documentation/devicetree/bindings/pci/ti,j721e-pci-host.yaml
+++ b/Documentation/devicetree/bindings/pci/ti,j721e-pci-host.yaml
@@ -14,6 +14,7 @@ properties:
   compatible:
     oneOf:
       - const: ti,j721e-pcie-host
+      - const: ti,j784s4-pcie-host
       - description: PCIe controller in AM64
         items:
           - const: ti,am64-pcie-host
@@ -115,6 +116,17 @@ allOf:
           minimum: 1
           maximum: 2
 
+  - if:
+      properties:
+        compatible:
+          enum:
+            - ti,j784s4-pcie-host
+    then:
+      properties:
+        num-lanes:
+          minimum: 1
+          maximum: 4
+
 required:
   - compatible
   - reg
-- 
2.25.1

[PATCH v10 5/5] PCI: j721e: add j784s4 PCIe configuration

[Achal Verma]

From: Matt Ranostay <mranostay@ti.com>

Add PCIe configuration for j784s4 platform which has 4x lane support.

Tested-by: Achal Verma <a-verma1@ti.com>
Signed-off-by: Matt Ranostay <mranostay@ti.com>
Reviewed-by: Roger Quadros <rogerq@kernel.org>
Signed-off-by: Achal Verma <a-verma1@ti.com>
---
 drivers/pci/controller/cadence/pci-j721e.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/drivers/pci/controller/cadence/pci-j721e.c b/drivers/pci/controller/cadence/pci-j721e.c
index 58dcac9021e4..cce7b391f931 100644
--- a/drivers/pci/controller/cadence/pci-j721e.c
+++ b/drivers/pci/controller/cadence/pci-j721e.c
@@ -330,6 +330,20 @@ static const struct j721e_pcie_data am64_pcie_ep_data = {
 	.max_lanes = 1,
 };
 
+static const struct j721e_pcie_data j784s4_pcie_rc_data = {
+	.mode = PCI_MODE_RC,
+	.quirk_retrain_flag = true,
+	.byte_access_allowed = false,
+	.linkdown_irq_regfield = LINK_DOWN,
+	.max_lanes = 4,
+};
+
+static const struct j721e_pcie_data j784s4_pcie_ep_data = {
+	.mode = PCI_MODE_EP,
+	.linkdown_irq_regfield = LINK_DOWN,
+	.max_lanes = 4,
+};
+
 static const struct of_device_id of_j721e_pcie_match[] = {
 	{
 		.compatible = "ti,j721e-pcie-host",
@@ -355,6 +369,14 @@ static const struct of_device_id of_j721e_pcie_match[] = {
 		.compatible = "ti,am64-pcie-ep",
 		.data = &am64_pcie_ep_data,
 	},
+	{
+		.compatible = "ti,j784s4-pcie-host",
+		.data = &j784s4_pcie_rc_data,
+	},
+	{
+		.compatible = "ti,j784s4-pcie-ep",
+		.data = &j784s4_pcie_ep_data,
+	},
 	{},
 };
 
-- 
2.25.1