[PATCH v2 00/17] Qcom PCIe cleanups and improvements

[PATCH v2 00/17] Qcom PCIe cleanups and improvements

[Manivannan Sadhasivam]

Hi,

This series brings in several code cleanups and improvements to the
Qualcomm PCIe controller drivers (RC and EP). The cleanup part mostly
cleans up the bitfield definitions and transitions to bulk APIs for clocks,
and resets. The improvement part adds the debugfs entry to track link
transition counts in RC driver.

Testing
-------

I have tested this series on SDM845, SM8250 and SC8280XP based platforms.
However, I'm counting on Qualcomm folks CCed to do testing on older IPQ/APQ
platforms.

Merging Strategy
----------------

Binding and driver patches through PCI tree and DTS patches through Qcom
tree.

NOTE: For the sake of maintaining dependency, I've clubbed both cleanup and
improvement patches in the same series. If any of the maintainers prefer to
have them splitted, please let me know.

Thanks,
Mani

Changes in v2:

* Moved the "mhi" region to last in the binding and dtsi's
* Dropped the patches renaming the "mmio" region

Manivannan Sadhasivam (17):
  PCI: qcom: Remove PCIE20_ prefix from register definitions
  PCI: qcom: Sort and group registers and bitfield definitions
  PCI: qcom: Use bitfield definitions for register fields
  PCI: qcom: Add missing macros for register fields
  PCI: qcom: Use lower case for hex
  PCI: qcom: Use bulk reset APIs for handling resets for IP rev 2.1.0
  PCI: qcom: Use bulk clock APIs for handling clocks for IP rev 1.0.0
  PCI: qcom: Use bulk clock APIs for handling clocks for IP rev 2.3.2
  PCI: qcom: Use bulk clock APIs for handling clocks for IP rev 2.3.3
  PCI: qcom: Use bulk reset APIs for handling resets for IP rev 2.3.3
  PCI: qcom: Use bulk reset APIs for handling resets for IP rev 2.4.0
  PCI: qcom: Use macros for defining total no. of clocks & supplies
  dt-bindings: PCI: qcom: Add "mhi" register region to supported SoCs
  arm64: dts: qcom: sdm845: Add "mhi" region to the PCIe nodes
  arm64: dts: qcom: sm8250: Add "mhi" region to the PCIe nodes
  arm64: dts: qcom: sc8280xp: Add "mhi" region to the PCIe nodes
  PCI: qcom: Expose link transition counts via debugfs

 .../devicetree/bindings/pci/qcom,pcie.yaml    |   12 +-
 arch/arm64/boot/dts/qcom/sc8280xp.dtsi        |   25 +-
 arch/arm64/boot/dts/qcom/sdm845.dtsi          |   10 +-
 arch/arm64/boot/dts/qcom/sm8250.dtsi          |   15 +-
 drivers/pci/controller/dwc/pcie-qcom.c        | 1009 ++++++-----------
 5 files changed, 402 insertions(+), 669 deletions(-)

-- 
2.25.1

[PATCH v2 01/17] PCI: qcom: Remove PCIE20_ prefix from register definitions

[Manivannan Sadhasivam]

The PCIE part is redundant and 20 doesn't represent anything across the
SoCs supported now. So let's get rid of the prefix.

This involves adding the IP version suffix to one definition of
PARF_SLV_ADDR_SPACE_SIZE that defines offset specific to that version.
The other definition is generic for the rest of the versions.

Also, the register PCIE20_LNK_CONTROL2_LINK_STATUS2 is not used anywhere,
hence removed.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
---
 drivers/pci/controller/dwc/pcie-qcom.c | 184 ++++++++++++-------------
 1 file changed, 91 insertions(+), 93 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
index a232b04af048..6930bc9ceeb5 100644
--- a/drivers/pci/controller/dwc/pcie-qcom.c
+++ b/drivers/pci/controller/dwc/pcie-qcom.c
@@ -33,7 +33,7 @@
 #include "../../pci.h"
 #include "pcie-designware.h"
 
-#define PCIE20_PARF_SYS_CTRL			0x00
+#define PARF_SYS_CTRL				0x00
 #define MST_WAKEUP_EN				BIT(13)
 #define SLV_WAKEUP_EN				BIT(12)
 #define MSTR_ACLK_CGC_DIS			BIT(10)
@@ -43,39 +43,39 @@
 #define L23_CLK_RMV_DIS				BIT(2)
 #define L1_CLK_RMV_DIS				BIT(1)
 
-#define PCIE20_PARF_PM_CTRL			0x20
+#define PARF_PM_CTRL				0x20
 #define REQ_NOT_ENTR_L1				BIT(5)
 
-#define PCIE20_PARF_PHY_CTRL			0x40
+#define PARF_PHY_CTRL				0x40
 #define PHY_CTRL_PHY_TX0_TERM_OFFSET_MASK	GENMASK(20, 16)
 #define PHY_CTRL_PHY_TX0_TERM_OFFSET(x)		((x) << 16)
 
-#define PCIE20_PARF_PHY_REFCLK			0x4C
+#define PARF_PHY_REFCLK				0x4C
 #define PHY_REFCLK_SSP_EN			BIT(16)
 #define PHY_REFCLK_USE_PAD			BIT(12)
 
-#define PCIE20_PARF_DBI_BASE_ADDR		0x168
-#define PCIE20_PARF_SLV_ADDR_SPACE_SIZE		0x16C
-#define PCIE20_PARF_MHI_CLOCK_RESET_CTRL	0x174
+#define PARF_DBI_BASE_ADDR			0x168
+#define PARF_SLV_ADDR_SPACE_SIZE_2_3_3		0x16C /* Register offset specific to IP rev 2.3.3 */
+#define PARF_MHI_CLOCK_RESET_CTRL		0x174
 #define AHB_CLK_EN				BIT(0)
 #define MSTR_AXI_CLK_EN				BIT(1)
 #define BYPASS					BIT(4)
 
-#define PCIE20_PARF_AXI_MSTR_WR_ADDR_HALT	0x178
-#define PCIE20_PARF_AXI_MSTR_WR_ADDR_HALT_V2	0x1A8
-#define PCIE20_PARF_LTSSM			0x1B0
-#define PCIE20_PARF_SID_OFFSET			0x234
-#define PCIE20_PARF_BDF_TRANSLATE_CFG		0x24C
-#define PCIE20_PARF_DEVICE_TYPE			0x1000
-#define PCIE20_PARF_BDF_TO_SID_TABLE_N		0x2000
+#define PARF_AXI_MSTR_WR_ADDR_HALT		0x178
+#define PARF_AXI_MSTR_WR_ADDR_HALT_V2		0x1A8
+#define PARF_LTSSM				0x1B0
+#define PARF_SID_OFFSET				0x234
+#define PARF_BDF_TRANSLATE_CFG			0x24C
+#define PARF_DEVICE_TYPE			0x1000
+#define PARF_BDF_TO_SID_TABLE_N			0x2000
 
-#define PCIE20_ELBI_SYS_CTRL			0x04
-#define PCIE20_ELBI_SYS_CTRL_LT_ENABLE		BIT(0)
+#define ELBI_SYS_CTRL				0x04
+#define ELBI_SYS_CTRL_LT_ENABLE			BIT(0)
 
-#define PCIE20_AXI_MSTR_RESP_COMP_CTRL0		0x818
+#define AXI_MSTR_RESP_COMP_CTRL0		0x818
 #define CFG_REMOTE_RD_REQ_BRIDGE_SIZE_2K	0x4
 #define CFG_REMOTE_RD_REQ_BRIDGE_SIZE_4K	0x5
-#define PCIE20_AXI_MSTR_RESP_COMP_CTRL1		0x81c
+#define AXI_MSTR_RESP_COMP_CTRL1		0x81c
 #define CFG_BRIDGE_SB_INIT			BIT(0)
 
 #define PCIE_CAP_SLOT_POWER_LIMIT_VAL		FIELD_PREP(PCI_EXP_SLTCAP_SPLV, \
@@ -93,30 +93,28 @@
 						PCIE_CAP_SLOT_POWER_LIMIT_VAL | \
 						PCIE_CAP_SLOT_POWER_LIMIT_SCALE)
 
-#define PCIE20_PARF_Q2A_FLUSH			0x1AC
+#define PARF_Q2A_FLUSH				0x1AC
 
-#define PCIE20_MISC_CONTROL_1_REG		0x8BC
+#define MISC_CONTROL_1_REG			0x8BC
 #define DBI_RO_WR_EN				1
 
 #define PERST_DELAY_US				1000
 /* PARF registers */
-#define PCIE20_PARF_PCS_DEEMPH			0x34
+#define PARF_PCS_DEEMPH				0x34
 #define PCS_DEEMPH_TX_DEEMPH_GEN1(x)		((x) << 16)
 #define PCS_DEEMPH_TX_DEEMPH_GEN2_3_5DB(x)	((x) << 8)
 #define PCS_DEEMPH_TX_DEEMPH_GEN2_6DB(x)	((x) << 0)
 
-#define PCIE20_PARF_PCS_SWING			0x38
+#define PARF_PCS_SWING				0x38
 #define PCS_SWING_TX_SWING_FULL(x)		((x) << 8)
 #define PCS_SWING_TX_SWING_LOW(x)		((x) << 0)
 
-#define PCIE20_PARF_CONFIG_BITS		0x50
+#define PARF_CONFIG_BITS			0x50
 #define PHY_RX0_EQ(x)				((x) << 24)
 
-#define PCIE20_v3_PARF_SLV_ADDR_SPACE_SIZE	0x358
+#define PARF_SLV_ADDR_SPACE_SIZE		0x358
 #define SLV_ADDR_SPACE_SZ			0x10000000
 
-#define PCIE20_LNK_CONTROL2_LINK_STATUS2	0xa0
-
 #define DEVICE_TYPE_RC				0x4
 
 #define QCOM_PCIE_2_1_0_MAX_SUPPLY	3
@@ -261,9 +259,9 @@ static void qcom_pcie_2_1_0_ltssm_enable(struct qcom_pcie *pcie)
 	u32 val;
 
 	/* enable link training */
-	val = readl(pcie->elbi + PCIE20_ELBI_SYS_CTRL);
-	val |= PCIE20_ELBI_SYS_CTRL_LT_ENABLE;
-	writel(val, pcie->elbi + PCIE20_ELBI_SYS_CTRL);
+	val = readl(pcie->elbi + ELBI_SYS_CTRL);
+	val |= ELBI_SYS_CTRL_LT_ENABLE;
+	writel(val, pcie->elbi + ELBI_SYS_CTRL);
 }
 
 static int qcom_pcie_get_resources_2_1_0(struct qcom_pcie *pcie)
@@ -333,7 +331,7 @@ static void qcom_pcie_deinit_2_1_0(struct qcom_pcie *pcie)
 	reset_control_assert(res->ext_reset);
 	reset_control_assert(res->phy_reset);
 
-	writel(1, pcie->parf + PCIE20_PARF_PHY_CTRL);
+	writel(1, pcie->parf + PARF_PHY_CTRL);
 
 	regulator_bulk_disable(ARRAY_SIZE(res->supplies), res->supplies);
 }
@@ -423,9 +421,9 @@ static int qcom_pcie_post_init_2_1_0(struct qcom_pcie *pcie)
 	int ret;
 
 	/* enable PCIe clocks and resets */
-	val = readl(pcie->parf + PCIE20_PARF_PHY_CTRL);
+	val = readl(pcie->parf + PARF_PHY_CTRL);
 	val &= ~BIT(0);
-	writel(val, pcie->parf + PCIE20_PARF_PHY_CTRL);
+	writel(val, pcie->parf + PARF_PHY_CTRL);
 
 	ret = clk_bulk_prepare_enable(ARRAY_SIZE(res->clks), res->clks);
 	if (ret)
@@ -436,37 +434,37 @@ static int qcom_pcie_post_init_2_1_0(struct qcom_pcie *pcie)
 		writel(PCS_DEEMPH_TX_DEEMPH_GEN1(24) |
 			       PCS_DEEMPH_TX_DEEMPH_GEN2_3_5DB(24) |
 			       PCS_DEEMPH_TX_DEEMPH_GEN2_6DB(34),
-		       pcie->parf + PCIE20_PARF_PCS_DEEMPH);
+		       pcie->parf + PARF_PCS_DEEMPH);
 		writel(PCS_SWING_TX_SWING_FULL(120) |
 			       PCS_SWING_TX_SWING_LOW(120),
-		       pcie->parf + PCIE20_PARF_PCS_SWING);
-		writel(PHY_RX0_EQ(4), pcie->parf + PCIE20_PARF_CONFIG_BITS);
+		       pcie->parf + PARF_PCS_SWING);
+		writel(PHY_RX0_EQ(4), pcie->parf + PARF_CONFIG_BITS);
 	}
 
 	if (of_device_is_compatible(node, "qcom,pcie-ipq8064")) {
 		/* set TX termination offset */
-		val = readl(pcie->parf + PCIE20_PARF_PHY_CTRL);
+		val = readl(pcie->parf + PARF_PHY_CTRL);
 		val &= ~PHY_CTRL_PHY_TX0_TERM_OFFSET_MASK;
 		val |= PHY_CTRL_PHY_TX0_TERM_OFFSET(7);
-		writel(val, pcie->parf + PCIE20_PARF_PHY_CTRL);
+		writel(val, pcie->parf + PARF_PHY_CTRL);
 	}
 
 	/* enable external reference clock */
-	val = readl(pcie->parf + PCIE20_PARF_PHY_REFCLK);
+	val = readl(pcie->parf + PARF_PHY_REFCLK);
 	/* USE_PAD is required only for ipq806x */
 	if (!of_device_is_compatible(node, "qcom,pcie-apq8064"))
 		val &= ~PHY_REFCLK_USE_PAD;
 	val |= PHY_REFCLK_SSP_EN;
-	writel(val, pcie->parf + PCIE20_PARF_PHY_REFCLK);
+	writel(val, pcie->parf + PARF_PHY_REFCLK);
 
 	/* wait for clock acquisition */
 	usleep_range(1000, 1500);
 
 	/* Set the Max TLP size to 2K, instead of using default of 4K */
 	writel(CFG_REMOTE_RD_REQ_BRIDGE_SIZE_2K,
-	       pci->dbi_base + PCIE20_AXI_MSTR_RESP_COMP_CTRL0);
+	       pci->dbi_base + AXI_MSTR_RESP_COMP_CTRL0);
 	writel(CFG_BRIDGE_SB_INIT,
-	       pci->dbi_base + PCIE20_AXI_MSTR_RESP_COMP_CTRL1);
+	       pci->dbi_base + AXI_MSTR_RESP_COMP_CTRL1);
 
 	return 0;
 }
@@ -574,13 +572,13 @@ static int qcom_pcie_init_1_0_0(struct qcom_pcie *pcie)
 static int qcom_pcie_post_init_1_0_0(struct qcom_pcie *pcie)
 {
 	/* change DBI base address */
-	writel(0, pcie->parf + PCIE20_PARF_DBI_BASE_ADDR);
+	writel(0, pcie->parf + PARF_DBI_BASE_ADDR);
 
 	if (IS_ENABLED(CONFIG_PCI_MSI)) {
-		u32 val = readl(pcie->parf + PCIE20_PARF_AXI_MSTR_WR_ADDR_HALT);
+		u32 val = readl(pcie->parf + PARF_AXI_MSTR_WR_ADDR_HALT);
 
 		val |= BIT(31);
-		writel(val, pcie->parf + PCIE20_PARF_AXI_MSTR_WR_ADDR_HALT);
+		writel(val, pcie->parf + PARF_AXI_MSTR_WR_ADDR_HALT);
 	}
 
 	return 0;
@@ -591,9 +589,9 @@ static void qcom_pcie_2_3_2_ltssm_enable(struct qcom_pcie *pcie)
 	u32 val;
 
 	/* enable link training */
-	val = readl(pcie->parf + PCIE20_PARF_LTSSM);
+	val = readl(pcie->parf + PARF_LTSSM);
 	val |= BIT(8);
-	writel(val, pcie->parf + PCIE20_PARF_LTSSM);
+	writel(val, pcie->parf + PARF_LTSSM);
 }
 
 static int qcom_pcie_get_resources_2_3_2(struct qcom_pcie *pcie)
@@ -698,25 +696,25 @@ static int qcom_pcie_post_init_2_3_2(struct qcom_pcie *pcie)
 	u32 val;
 
 	/* enable PCIe clocks and resets */
-	val = readl(pcie->parf + PCIE20_PARF_PHY_CTRL);
+	val = readl(pcie->parf + PARF_PHY_CTRL);
 	val &= ~BIT(0);
-	writel(val, pcie->parf + PCIE20_PARF_PHY_CTRL);
+	writel(val, pcie->parf + PARF_PHY_CTRL);
 
 	/* change DBI base address */
-	writel(0, pcie->parf + PCIE20_PARF_DBI_BASE_ADDR);
+	writel(0, pcie->parf + PARF_DBI_BASE_ADDR);
 
 	/* MAC PHY_POWERDOWN MUX DISABLE  */
-	val = readl(pcie->parf + PCIE20_PARF_SYS_CTRL);
+	val = readl(pcie->parf + PARF_SYS_CTRL);
 	val &= ~BIT(29);
-	writel(val, pcie->parf + PCIE20_PARF_SYS_CTRL);
+	writel(val, pcie->parf + PARF_SYS_CTRL);
 
-	val = readl(pcie->parf + PCIE20_PARF_MHI_CLOCK_RESET_CTRL);
+	val = readl(pcie->parf + PARF_MHI_CLOCK_RESET_CTRL);
 	val |= BIT(4);
-	writel(val, pcie->parf + PCIE20_PARF_MHI_CLOCK_RESET_CTRL);
+	writel(val, pcie->parf + PARF_MHI_CLOCK_RESET_CTRL);
 
-	val = readl(pcie->parf + PCIE20_PARF_AXI_MSTR_WR_ADDR_HALT_V2);
+	val = readl(pcie->parf + PARF_AXI_MSTR_WR_ADDR_HALT_V2);
 	val |= BIT(31);
-	writel(val, pcie->parf + PCIE20_PARF_AXI_MSTR_WR_ADDR_HALT_V2);
+	writel(val, pcie->parf + PARF_AXI_MSTR_WR_ADDR_HALT_V2);
 
 	return 0;
 }
@@ -977,25 +975,25 @@ static int qcom_pcie_post_init_2_4_0(struct qcom_pcie *pcie)
 	u32 val;
 
 	/* enable PCIe clocks and resets */
-	val = readl(pcie->parf + PCIE20_PARF_PHY_CTRL);
+	val = readl(pcie->parf + PARF_PHY_CTRL);
 	val &= ~BIT(0);
-	writel(val, pcie->parf + PCIE20_PARF_PHY_CTRL);
+	writel(val, pcie->parf + PARF_PHY_CTRL);
 
 	/* change DBI base address */
-	writel(0, pcie->parf + PCIE20_PARF_DBI_BASE_ADDR);
+	writel(0, pcie->parf + PARF_DBI_BASE_ADDR);
 
 	/* MAC PHY_POWERDOWN MUX DISABLE  */
-	val = readl(pcie->parf + PCIE20_PARF_SYS_CTRL);
+	val = readl(pcie->parf + PARF_SYS_CTRL);
 	val &= ~BIT(29);
-	writel(val, pcie->parf + PCIE20_PARF_SYS_CTRL);
+	writel(val, pcie->parf + PARF_SYS_CTRL);
 
-	val = readl(pcie->parf + PCIE20_PARF_MHI_CLOCK_RESET_CTRL);
+	val = readl(pcie->parf + PARF_MHI_CLOCK_RESET_CTRL);
 	val |= BIT(4);
-	writel(val, pcie->parf + PCIE20_PARF_MHI_CLOCK_RESET_CTRL);
+	writel(val, pcie->parf + PARF_MHI_CLOCK_RESET_CTRL);
 
-	val = readl(pcie->parf + PCIE20_PARF_AXI_MSTR_WR_ADDR_HALT_V2);
+	val = readl(pcie->parf + PARF_AXI_MSTR_WR_ADDR_HALT_V2);
 	val |= BIT(31);
-	writel(val, pcie->parf + PCIE20_PARF_AXI_MSTR_WR_ADDR_HALT_V2);
+	writel(val, pcie->parf + PARF_AXI_MSTR_WR_ADDR_HALT_V2);
 
 	return 0;
 }
@@ -1140,22 +1138,22 @@ static int qcom_pcie_post_init_2_3_3(struct qcom_pcie *pcie)
 	u32 val;
 
 	writel(SLV_ADDR_SPACE_SZ,
-		pcie->parf + PCIE20_v3_PARF_SLV_ADDR_SPACE_SIZE);
+		pcie->parf + PARF_SLV_ADDR_SPACE_SIZE_2_3_3);
 
-	val = readl(pcie->parf + PCIE20_PARF_PHY_CTRL);
+	val = readl(pcie->parf + PARF_PHY_CTRL);
 	val &= ~BIT(0);
-	writel(val, pcie->parf + PCIE20_PARF_PHY_CTRL);
+	writel(val, pcie->parf + PARF_PHY_CTRL);
 
-	writel(0, pcie->parf + PCIE20_PARF_DBI_BASE_ADDR);
+	writel(0, pcie->parf + PARF_DBI_BASE_ADDR);
 
 	writel(MST_WAKEUP_EN | SLV_WAKEUP_EN | MSTR_ACLK_CGC_DIS
 		| SLV_ACLK_CGC_DIS | CORE_CLK_CGC_DIS |
 		AUX_PWR_DET | L23_CLK_RMV_DIS | L1_CLK_RMV_DIS,
-		pcie->parf + PCIE20_PARF_SYS_CTRL);
-	writel(0, pcie->parf + PCIE20_PARF_Q2A_FLUSH);
+		pcie->parf + PARF_SYS_CTRL);
+	writel(0, pcie->parf + PARF_Q2A_FLUSH);
 
 	writel(PCI_COMMAND_MASTER, pci->dbi_base + PCI_COMMAND);
-	writel(DBI_RO_WR_EN, pci->dbi_base + PCIE20_MISC_CONTROL_1_REG);
+	writel(DBI_RO_WR_EN, pci->dbi_base + MISC_CONTROL_1_REG);
 	writel(PCIE_CAP_SLOT_VAL, pci->dbi_base + offset + PCI_EXP_SLTCAP);
 
 	val = readl(pci->dbi_base + offset + PCI_EXP_LNKCAP);
@@ -1255,34 +1253,34 @@ static int qcom_pcie_init_2_7_0(struct qcom_pcie *pcie)
 	usleep_range(1000, 1500);
 
 	/* configure PCIe to RC mode */
-	writel(DEVICE_TYPE_RC, pcie->parf + PCIE20_PARF_DEVICE_TYPE);
+	writel(DEVICE_TYPE_RC, pcie->parf + PARF_DEVICE_TYPE);
 
 	/* enable PCIe clocks and resets */
-	val = readl(pcie->parf + PCIE20_PARF_PHY_CTRL);
+	val = readl(pcie->parf + PARF_PHY_CTRL);
 	val &= ~BIT(0);
-	writel(val, pcie->parf + PCIE20_PARF_PHY_CTRL);
+	writel(val, pcie->parf + PARF_PHY_CTRL);
 
 	/* change DBI base address */
-	writel(0, pcie->parf + PCIE20_PARF_DBI_BASE_ADDR);
+	writel(0, pcie->parf + PARF_DBI_BASE_ADDR);
 
 	/* MAC PHY_POWERDOWN MUX DISABLE  */
-	val = readl(pcie->parf + PCIE20_PARF_SYS_CTRL);
+	val = readl(pcie->parf + PARF_SYS_CTRL);
 	val &= ~BIT(29);
-	writel(val, pcie->parf + PCIE20_PARF_SYS_CTRL);
+	writel(val, pcie->parf + PARF_SYS_CTRL);
 
-	val = readl(pcie->parf + PCIE20_PARF_MHI_CLOCK_RESET_CTRL);
+	val = readl(pcie->parf + PARF_MHI_CLOCK_RESET_CTRL);
 	val |= BIT(4);
-	writel(val, pcie->parf + PCIE20_PARF_MHI_CLOCK_RESET_CTRL);
+	writel(val, pcie->parf + PARF_MHI_CLOCK_RESET_CTRL);
 
 	/* Enable L1 and L1SS */
-	val = readl(pcie->parf + PCIE20_PARF_PM_CTRL);
+	val = readl(pcie->parf + PARF_PM_CTRL);
 	val &= ~REQ_NOT_ENTR_L1;
-	writel(val, pcie->parf + PCIE20_PARF_PM_CTRL);
+	writel(val, pcie->parf + PARF_PM_CTRL);
 
 	if (IS_ENABLED(CONFIG_PCI_MSI)) {
-		val = readl(pcie->parf + PCIE20_PARF_AXI_MSTR_WR_ADDR_HALT);
+		val = readl(pcie->parf + PARF_AXI_MSTR_WR_ADDR_HALT);
 		val |= BIT(31);
-		writel(val, pcie->parf + PCIE20_PARF_AXI_MSTR_WR_ADDR_HALT);
+		writel(val, pcie->parf + PARF_AXI_MSTR_WR_ADDR_HALT);
 	}
 
 	return 0;
@@ -1371,17 +1369,17 @@ static int qcom_pcie_post_init_2_9_0(struct qcom_pcie *pcie)
 	int i;
 
 	writel(SLV_ADDR_SPACE_SZ,
-		pcie->parf + PCIE20_v3_PARF_SLV_ADDR_SPACE_SIZE);
+		pcie->parf + PARF_SLV_ADDR_SPACE_SIZE);
 
-	val = readl(pcie->parf + PCIE20_PARF_PHY_CTRL);
+	val = readl(pcie->parf + PARF_PHY_CTRL);
 	val &= ~BIT(0);
-	writel(val, pcie->parf + PCIE20_PARF_PHY_CTRL);
+	writel(val, pcie->parf + PARF_PHY_CTRL);
 
-	writel(0, pcie->parf + PCIE20_PARF_DBI_BASE_ADDR);
+	writel(0, pcie->parf + PARF_DBI_BASE_ADDR);
 
-	writel(DEVICE_TYPE_RC, pcie->parf + PCIE20_PARF_DEVICE_TYPE);
+	writel(DEVICE_TYPE_RC, pcie->parf + PARF_DEVICE_TYPE);
 	writel(BYPASS | MSTR_AXI_CLK_EN | AHB_CLK_EN,
-		pcie->parf + PCIE20_PARF_MHI_CLOCK_RESET_CTRL);
+		pcie->parf + PARF_MHI_CLOCK_RESET_CTRL);
 	writel(GEN3_RELATED_OFF_RXEQ_RGRDLESS_RXTS |
 		GEN3_RELATED_OFF_GEN3_ZRXDC_NONCOMPL,
 		pci->dbi_base + GEN3_RELATED_OFF);
@@ -1389,9 +1387,9 @@ static int qcom_pcie_post_init_2_9_0(struct qcom_pcie *pcie)
 	writel(MST_WAKEUP_EN | SLV_WAKEUP_EN | MSTR_ACLK_CGC_DIS |
 		SLV_ACLK_CGC_DIS | CORE_CLK_CGC_DIS |
 		AUX_PWR_DET | L23_CLK_RMV_DIS | L1_CLK_RMV_DIS,
-		pcie->parf + PCIE20_PARF_SYS_CTRL);
+		pcie->parf + PARF_SYS_CTRL);
 
-	writel(0, pcie->parf + PCIE20_PARF_Q2A_FLUSH);
+	writel(0, pcie->parf + PARF_Q2A_FLUSH);
 
 	dw_pcie_dbi_ro_wr_en(pci);
 	writel(PCIE_CAP_SLOT_VAL, pci->dbi_base + offset + PCI_EXP_SLTCAP);
@@ -1404,7 +1402,7 @@ static int qcom_pcie_post_init_2_9_0(struct qcom_pcie *pcie)
 			PCI_EXP_DEVCTL2);
 
 	for (i = 0; i < 256; i++)
-		writel(0, pcie->parf + PCIE20_PARF_BDF_TO_SID_TABLE_N + (4 * i));
+		writel(0, pcie->parf + PARF_BDF_TO_SID_TABLE_N + (4 * i));
 
 	return 0;
 }
@@ -1426,7 +1424,7 @@ static int qcom_pcie_config_sid_sm8250(struct qcom_pcie *pcie)
 		u32 smmu_sid;
 		u32 smmu_sid_len;
 	} *map;
-	void __iomem *bdf_to_sid_base = pcie->parf + PCIE20_PARF_BDF_TO_SID_TABLE_N;
+	void __iomem *bdf_to_sid_base = pcie->parf + PARF_BDF_TO_SID_TABLE_N;
 	struct device *dev = pcie->pci->dev;
 	u8 qcom_pcie_crc8_table[CRC8_TABLE_SIZE];
 	int i, nr_map, size = 0;
-- 
2.25.1

[PATCH v2 02/17] PCI: qcom: Sort and group registers and bitfield definitions

[Manivannan Sadhasivam]

Sorting the registers and their bit definitions will make it easier to add
more definitions in the future and it also helps in maintenance.

While at it, let's also group the registers and bit definitions separately
as done in the pcie-qcom-ep driver.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
---
 drivers/pci/controller/dwc/pcie-qcom.c | 108 ++++++++++++++-----------
 1 file changed, 63 insertions(+), 45 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
index 6930bc9ceeb5..9223ca76640d 100644
--- a/drivers/pci/controller/dwc/pcie-qcom.c
+++ b/drivers/pci/controller/dwc/pcie-qcom.c
@@ -33,7 +33,36 @@
 #include "../../pci.h"
 #include "pcie-designware.h"
 
+/* PARF registers */
 #define PARF_SYS_CTRL				0x00
+#define PARF_PM_CTRL				0x20
+#define PARF_PCS_DEEMPH				0x34
+#define PARF_PCS_SWING				0x38
+#define PARF_PHY_CTRL				0x40
+#define PARF_PHY_REFCLK				0x4C
+#define PARF_CONFIG_BITS			0x50
+#define PARF_DBI_BASE_ADDR			0x168
+#define PARF_SLV_ADDR_SPACE_SIZE_2_3_3		0x16C /* Register offset specific to IP ver 2.3.3 */
+#define PARF_MHI_CLOCK_RESET_CTRL		0x174
+#define PARF_AXI_MSTR_WR_ADDR_HALT		0x178
+#define PARF_AXI_MSTR_WR_ADDR_HALT_V2		0x1A8
+#define PARF_Q2A_FLUSH				0x1AC
+#define PARF_LTSSM				0x1B0
+#define PARF_SID_OFFSET				0x234
+#define PARF_BDF_TRANSLATE_CFG			0x24C
+#define PARF_SLV_ADDR_SPACE_SIZE		0x358
+#define PARF_DEVICE_TYPE			0x1000
+#define PARF_BDF_TO_SID_TABLE_N			0x2000
+
+/* ELBI registers */
+#define ELBI_SYS_CTRL				0x04
+
+/* DBI registers */
+#define AXI_MSTR_RESP_COMP_CTRL0		0x818
+#define AXI_MSTR_RESP_COMP_CTRL1		0x81c
+#define MISC_CONTROL_1_REG			0x8BC
+
+/* PARF_SYS_CTRL register fields */
 #define MST_WAKEUP_EN				BIT(13)
 #define SLV_WAKEUP_EN				BIT(12)
 #define MSTR_ACLK_CGC_DIS			BIT(10)
@@ -43,45 +72,56 @@
 #define L23_CLK_RMV_DIS				BIT(2)
 #define L1_CLK_RMV_DIS				BIT(1)
 
-#define PARF_PM_CTRL				0x20
+/* PARF_PM_CTRL register fields */
 #define REQ_NOT_ENTR_L1				BIT(5)
 
-#define PARF_PHY_CTRL				0x40
+/* PARF_PCS_DEEMPH register fields */
+#define PCS_DEEMPH_TX_DEEMPH_GEN1(x)		((x) << 16)
+#define PCS_DEEMPH_TX_DEEMPH_GEN2_3_5DB(x)	((x) << 8)
+#define PCS_DEEMPH_TX_DEEMPH_GEN2_6DB(x)	((x) << 0)
+
+/* PARF_PCS_SWING register fields */
+#define PCS_SWING_TX_SWING_FULL(x)		((x) << 8)
+#define PCS_SWING_TX_SWING_LOW(x)		((x) << 0)
+
+/* PARF_PHY_CTRL register fields */
 #define PHY_CTRL_PHY_TX0_TERM_OFFSET_MASK	GENMASK(20, 16)
 #define PHY_CTRL_PHY_TX0_TERM_OFFSET(x)		((x) << 16)
 
-#define PARF_PHY_REFCLK				0x4C
+/* PARF_PHY_REFCLK register fields */
 #define PHY_REFCLK_SSP_EN			BIT(16)
 #define PHY_REFCLK_USE_PAD			BIT(12)
 
-#define PARF_DBI_BASE_ADDR			0x168
-#define PARF_SLV_ADDR_SPACE_SIZE_2_3_3		0x16C /* Register offset specific to IP rev 2.3.3 */
-#define PARF_MHI_CLOCK_RESET_CTRL		0x174
+/* PARF_CONFIG_BITS register fields */
+#define PHY_RX0_EQ(x)				((x) << 24)
+
+/* PARF_SLV_ADDR_SPACE_SIZE register value */
+#define SLV_ADDR_SPACE_SZ			0x10000000
+
+/* PARF_MHI_CLOCK_RESET_CTRL register fields */
 #define AHB_CLK_EN				BIT(0)
 #define MSTR_AXI_CLK_EN				BIT(1)
 #define BYPASS					BIT(4)
 
-#define PARF_AXI_MSTR_WR_ADDR_HALT		0x178
-#define PARF_AXI_MSTR_WR_ADDR_HALT_V2		0x1A8
-#define PARF_LTSSM				0x1B0
-#define PARF_SID_OFFSET				0x234
-#define PARF_BDF_TRANSLATE_CFG			0x24C
-#define PARF_DEVICE_TYPE			0x1000
-#define PARF_BDF_TO_SID_TABLE_N			0x2000
+/* PARF_DEVICE_TYPE register fields */
+#define DEVICE_TYPE_RC				0x4
 
-#define ELBI_SYS_CTRL				0x04
+/* ELBI_SYS_CTRL register fields */
 #define ELBI_SYS_CTRL_LT_ENABLE			BIT(0)
 
-#define AXI_MSTR_RESP_COMP_CTRL0		0x818
+/* AXI_MSTR_RESP_COMP_CTRL0 register fields */
 #define CFG_REMOTE_RD_REQ_BRIDGE_SIZE_2K	0x4
 #define CFG_REMOTE_RD_REQ_BRIDGE_SIZE_4K	0x5
-#define AXI_MSTR_RESP_COMP_CTRL1		0x81c
+
+/* AXI_MSTR_RESP_COMP_CTRL1 register fields */
 #define CFG_BRIDGE_SB_INIT			BIT(0)
 
-#define PCIE_CAP_SLOT_POWER_LIMIT_VAL		FIELD_PREP(PCI_EXP_SLTCAP_SPLV, \
-						250)
-#define PCIE_CAP_SLOT_POWER_LIMIT_SCALE		FIELD_PREP(PCI_EXP_SLTCAP_SPLS, \
-						1)
+/* MISC_CONTROL_1_REG register fields */
+#define DBI_RO_WR_EN				1
+
+/* PCI_EXP_SLTCAP register fields */
+#define PCIE_CAP_SLOT_POWER_LIMIT_VAL		FIELD_PREP(PCI_EXP_SLTCAP_SPLV, 250)
+#define PCIE_CAP_SLOT_POWER_LIMIT_SCALE		FIELD_PREP(PCI_EXP_SLTCAP_SPLS, 1)
 #define PCIE_CAP_SLOT_VAL			(PCI_EXP_SLTCAP_ABP | \
 						PCI_EXP_SLTCAP_PCP | \
 						PCI_EXP_SLTCAP_MRLSP | \
@@ -93,34 +133,12 @@
 						PCIE_CAP_SLOT_POWER_LIMIT_VAL | \
 						PCIE_CAP_SLOT_POWER_LIMIT_SCALE)
 
-#define PARF_Q2A_FLUSH				0x1AC
-
-#define MISC_CONTROL_1_REG			0x8BC
-#define DBI_RO_WR_EN				1
-
 #define PERST_DELAY_US				1000
-/* PARF registers */
-#define PARF_PCS_DEEMPH				0x34
-#define PCS_DEEMPH_TX_DEEMPH_GEN1(x)		((x) << 16)
-#define PCS_DEEMPH_TX_DEEMPH_GEN2_3_5DB(x)	((x) << 8)
-#define PCS_DEEMPH_TX_DEEMPH_GEN2_6DB(x)	((x) << 0)
-
-#define PARF_PCS_SWING				0x38
-#define PCS_SWING_TX_SWING_FULL(x)		((x) << 8)
-#define PCS_SWING_TX_SWING_LOW(x)		((x) << 0)
-
-#define PARF_CONFIG_BITS			0x50
-#define PHY_RX0_EQ(x)				((x) << 24)
-
-#define PARF_SLV_ADDR_SPACE_SIZE		0x358
-#define SLV_ADDR_SPACE_SZ			0x10000000
-
-#define DEVICE_TYPE_RC				0x4
 
-#define QCOM_PCIE_2_1_0_MAX_SUPPLY	3
-#define QCOM_PCIE_2_1_0_MAX_CLOCKS	5
+#define QCOM_PCIE_2_1_0_MAX_SUPPLY		3
+#define QCOM_PCIE_2_1_0_MAX_CLOCKS		5
 
-#define QCOM_PCIE_CRC8_POLYNOMIAL (BIT(2) | BIT(1) | BIT(0))
+#define QCOM_PCIE_CRC8_POLYNOMIAL		(BIT(2) | BIT(1) | BIT(0))
 
 struct qcom_pcie_resources_2_1_0 {
 	struct clk_bulk_data clks[QCOM_PCIE_2_1_0_MAX_CLOCKS];
-- 
2.25.1

[PATCH v2 03/17] PCI: qcom: Use bitfield definitions for register fields

[Manivannan Sadhasivam]

To maintain uniformity throughout the driver and also to make the code
easier to read, let's make use of bitfield definitions for register fields.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
---
 drivers/pci/controller/dwc/pcie-qcom.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
index 9223ca76640d..e9f4c70b719a 100644
--- a/drivers/pci/controller/dwc/pcie-qcom.c
+++ b/drivers/pci/controller/dwc/pcie-qcom.c
@@ -76,24 +76,24 @@
 #define REQ_NOT_ENTR_L1				BIT(5)
 
 /* PARF_PCS_DEEMPH register fields */
-#define PCS_DEEMPH_TX_DEEMPH_GEN1(x)		((x) << 16)
-#define PCS_DEEMPH_TX_DEEMPH_GEN2_3_5DB(x)	((x) << 8)
-#define PCS_DEEMPH_TX_DEEMPH_GEN2_6DB(x)	((x) << 0)
+#define PCS_DEEMPH_TX_DEEMPH_GEN1(x)		FIELD_PREP(GENMASK(21, 16), x)
+#define PCS_DEEMPH_TX_DEEMPH_GEN2_3_5DB(x)	FIELD_PREP(GENMASK(13, 8), x)
+#define PCS_DEEMPH_TX_DEEMPH_GEN2_6DB(x)	FIELD_PREP(GENMASK(5, 0), x)
 
 /* PARF_PCS_SWING register fields */
-#define PCS_SWING_TX_SWING_FULL(x)		((x) << 8)
-#define PCS_SWING_TX_SWING_LOW(x)		((x) << 0)
+#define PCS_SWING_TX_SWING_FULL(x)		FIELD_PREP(GENMASK(14, 8), x)
+#define PCS_SWING_TX_SWING_LOW(x)		FIELD_PREP(GENMASK(6, 0), x)
 
 /* PARF_PHY_CTRL register fields */
 #define PHY_CTRL_PHY_TX0_TERM_OFFSET_MASK	GENMASK(20, 16)
-#define PHY_CTRL_PHY_TX0_TERM_OFFSET(x)		((x) << 16)
+#define PHY_CTRL_PHY_TX0_TERM_OFFSET(x)		FIELD_PREP(PHY_CTRL_PHY_TX0_TERM_OFFSET_MASK, x)
 
 /* PARF_PHY_REFCLK register fields */
 #define PHY_REFCLK_SSP_EN			BIT(16)
 #define PHY_REFCLK_USE_PAD			BIT(12)
 
 /* PARF_CONFIG_BITS register fields */
-#define PHY_RX0_EQ(x)				((x) << 24)
+#define PHY_RX0_EQ(x)				FIELD_PREP(GENMASK(26, 24), x)
 
 /* PARF_SLV_ADDR_SPACE_SIZE register value */
 #define SLV_ADDR_SPACE_SZ			0x10000000
-- 
2.25.1

[PATCH v2 04/17] PCI: qcom: Add missing macros for register fields

[Manivannan Sadhasivam]

Some of the registers are changed using hardcoded bitfields without macros.
This provides no information on what the register setting is about. So add
the macros to those fields for making the code more understandable.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
---
 drivers/pci/controller/dwc/pcie-qcom.c | 42 +++++++++++++++-----------
 1 file changed, 25 insertions(+), 17 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
index e9f4c70b719a..926a531fda3a 100644
--- a/drivers/pci/controller/dwc/pcie-qcom.c
+++ b/drivers/pci/controller/dwc/pcie-qcom.c
@@ -63,6 +63,7 @@
 #define MISC_CONTROL_1_REG			0x8BC
 
 /* PARF_SYS_CTRL register fields */
+#define MAC_PHY_POWERDOWN_IN_P2_D_MUX_EN	BIT(29)
 #define MST_WAKEUP_EN				BIT(13)
 #define SLV_WAKEUP_EN				BIT(12)
 #define MSTR_ACLK_CGC_DIS			BIT(10)
@@ -87,6 +88,7 @@
 /* PARF_PHY_CTRL register fields */
 #define PHY_CTRL_PHY_TX0_TERM_OFFSET_MASK	GENMASK(20, 16)
 #define PHY_CTRL_PHY_TX0_TERM_OFFSET(x)		FIELD_PREP(PHY_CTRL_PHY_TX0_TERM_OFFSET_MASK, x)
+#define PHY_TEST_PWR_DOWN			BIT(0)
 
 /* PARF_PHY_REFCLK register fields */
 #define PHY_REFCLK_SSP_EN			BIT(16)
@@ -103,6 +105,12 @@
 #define MSTR_AXI_CLK_EN				BIT(1)
 #define BYPASS					BIT(4)
 
+/* PARF_AXI_MSTR_WR_ADDR_HALT register fields */
+#define EN					BIT(31)
+
+/* PARF_LTSSM register fields */
+#define LTSSM_EN				BIT(8)
+
 /* PARF_DEVICE_TYPE register fields */
 #define DEVICE_TYPE_RC				0x4
 
@@ -440,7 +448,7 @@ static int qcom_pcie_post_init_2_1_0(struct qcom_pcie *pcie)
 
 	/* enable PCIe clocks and resets */
 	val = readl(pcie->parf + PARF_PHY_CTRL);
-	val &= ~BIT(0);
+	val &= ~PHY_TEST_PWR_DOWN;
 	writel(val, pcie->parf + PARF_PHY_CTRL);
 
 	ret = clk_bulk_prepare_enable(ARRAY_SIZE(res->clks), res->clks);
@@ -595,7 +603,7 @@ static int qcom_pcie_post_init_1_0_0(struct qcom_pcie *pcie)
 	if (IS_ENABLED(CONFIG_PCI_MSI)) {
 		u32 val = readl(pcie->parf + PARF_AXI_MSTR_WR_ADDR_HALT);
 
-		val |= BIT(31);
+		val |= EN;
 		writel(val, pcie->parf + PARF_AXI_MSTR_WR_ADDR_HALT);
 	}
 
@@ -608,7 +616,7 @@ static void qcom_pcie_2_3_2_ltssm_enable(struct qcom_pcie *pcie)
 
 	/* enable link training */
 	val = readl(pcie->parf + PARF_LTSSM);
-	val |= BIT(8);
+	val |= LTSSM_EN;
 	writel(val, pcie->parf + PARF_LTSSM);
 }
 
@@ -715,7 +723,7 @@ static int qcom_pcie_post_init_2_3_2(struct qcom_pcie *pcie)
 
 	/* enable PCIe clocks and resets */
 	val = readl(pcie->parf + PARF_PHY_CTRL);
-	val &= ~BIT(0);
+	val &= ~PHY_TEST_PWR_DOWN;
 	writel(val, pcie->parf + PARF_PHY_CTRL);
 
 	/* change DBI base address */
@@ -723,15 +731,15 @@ static int qcom_pcie_post_init_2_3_2(struct qcom_pcie *pcie)
 
 	/* MAC PHY_POWERDOWN MUX DISABLE  */
 	val = readl(pcie->parf + PARF_SYS_CTRL);
-	val &= ~BIT(29);
+	val &= ~MAC_PHY_POWERDOWN_IN_P2_D_MUX_EN;
 	writel(val, pcie->parf + PARF_SYS_CTRL);
 
 	val = readl(pcie->parf + PARF_MHI_CLOCK_RESET_CTRL);
-	val |= BIT(4);
+	val |= BYPASS;
 	writel(val, pcie->parf + PARF_MHI_CLOCK_RESET_CTRL);
 
 	val = readl(pcie->parf + PARF_AXI_MSTR_WR_ADDR_HALT_V2);
-	val |= BIT(31);
+	val |= EN;
 	writel(val, pcie->parf + PARF_AXI_MSTR_WR_ADDR_HALT_V2);
 
 	return 0;
@@ -994,7 +1002,7 @@ static int qcom_pcie_post_init_2_4_0(struct qcom_pcie *pcie)
 
 	/* enable PCIe clocks and resets */
 	val = readl(pcie->parf + PARF_PHY_CTRL);
-	val &= ~BIT(0);
+	val &= ~PHY_TEST_PWR_DOWN;
 	writel(val, pcie->parf + PARF_PHY_CTRL);
 
 	/* change DBI base address */
@@ -1002,15 +1010,15 @@ static int qcom_pcie_post_init_2_4_0(struct qcom_pcie *pcie)
 
 	/* MAC PHY_POWERDOWN MUX DISABLE  */
 	val = readl(pcie->parf + PARF_SYS_CTRL);
-	val &= ~BIT(29);
+	val &= ~MAC_PHY_POWERDOWN_IN_P2_D_MUX_EN;
 	writel(val, pcie->parf + PARF_SYS_CTRL);
 
 	val = readl(pcie->parf + PARF_MHI_CLOCK_RESET_CTRL);
-	val |= BIT(4);
+	val |= BYPASS;
 	writel(val, pcie->parf + PARF_MHI_CLOCK_RESET_CTRL);
 
 	val = readl(pcie->parf + PARF_AXI_MSTR_WR_ADDR_HALT_V2);
-	val |= BIT(31);
+	val |= EN;
 	writel(val, pcie->parf + PARF_AXI_MSTR_WR_ADDR_HALT_V2);
 
 	return 0;
@@ -1159,7 +1167,7 @@ static int qcom_pcie_post_init_2_3_3(struct qcom_pcie *pcie)
 		pcie->parf + PARF_SLV_ADDR_SPACE_SIZE_2_3_3);
 
 	val = readl(pcie->parf + PARF_PHY_CTRL);
-	val &= ~BIT(0);
+	val &= ~PHY_TEST_PWR_DOWN;
 	writel(val, pcie->parf + PARF_PHY_CTRL);
 
 	writel(0, pcie->parf + PARF_DBI_BASE_ADDR);
@@ -1275,7 +1283,7 @@ static int qcom_pcie_init_2_7_0(struct qcom_pcie *pcie)
 
 	/* enable PCIe clocks and resets */
 	val = readl(pcie->parf + PARF_PHY_CTRL);
-	val &= ~BIT(0);
+	val &= ~PHY_TEST_PWR_DOWN;
 	writel(val, pcie->parf + PARF_PHY_CTRL);
 
 	/* change DBI base address */
@@ -1283,11 +1291,11 @@ static int qcom_pcie_init_2_7_0(struct qcom_pcie *pcie)
 
 	/* MAC PHY_POWERDOWN MUX DISABLE  */
 	val = readl(pcie->parf + PARF_SYS_CTRL);
-	val &= ~BIT(29);
+	val &= ~MAC_PHY_POWERDOWN_IN_P2_D_MUX_EN;
 	writel(val, pcie->parf + PARF_SYS_CTRL);
 
 	val = readl(pcie->parf + PARF_MHI_CLOCK_RESET_CTRL);
-	val |= BIT(4);
+	val |= BYPASS;
 	writel(val, pcie->parf + PARF_MHI_CLOCK_RESET_CTRL);
 
 	/* Enable L1 and L1SS */
@@ -1297,7 +1305,7 @@ static int qcom_pcie_init_2_7_0(struct qcom_pcie *pcie)
 
 	if (IS_ENABLED(CONFIG_PCI_MSI)) {
 		val = readl(pcie->parf + PARF_AXI_MSTR_WR_ADDR_HALT);
-		val |= BIT(31);
+		val |= EN;
 		writel(val, pcie->parf + PARF_AXI_MSTR_WR_ADDR_HALT);
 	}
 
@@ -1390,7 +1398,7 @@ static int qcom_pcie_post_init_2_9_0(struct qcom_pcie *pcie)
 		pcie->parf + PARF_SLV_ADDR_SPACE_SIZE);
 
 	val = readl(pcie->parf + PARF_PHY_CTRL);
-	val &= ~BIT(0);
+	val &= ~PHY_TEST_PWR_DOWN;
 	writel(val, pcie->parf + PARF_PHY_CTRL);
 
 	writel(0, pcie->parf + PARF_DBI_BASE_ADDR);
-- 
2.25.1

[PATCH v2 05/17] PCI: qcom: Use lower case for hex

[Manivannan Sadhasivam]

To maintain uniformity, let's use lower case for representing hexadecimal
numbers.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
---
 drivers/pci/controller/dwc/pcie-qcom.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
index 926a531fda3a..4179ac973147 100644
--- a/drivers/pci/controller/dwc/pcie-qcom.c
+++ b/drivers/pci/controller/dwc/pcie-qcom.c
@@ -39,17 +39,17 @@
 #define PARF_PCS_DEEMPH				0x34
 #define PARF_PCS_SWING				0x38
 #define PARF_PHY_CTRL				0x40
-#define PARF_PHY_REFCLK				0x4C
+#define PARF_PHY_REFCLK				0x4c
 #define PARF_CONFIG_BITS			0x50
 #define PARF_DBI_BASE_ADDR			0x168
-#define PARF_SLV_ADDR_SPACE_SIZE_2_3_3		0x16C /* Register offset specific to IP ver 2.3.3 */
+#define PARF_SLV_ADDR_SPACE_SIZE_2_3_3		0x16c /* Register offset specific to IP ver 2.3.3 */
 #define PARF_MHI_CLOCK_RESET_CTRL		0x174
 #define PARF_AXI_MSTR_WR_ADDR_HALT		0x178
-#define PARF_AXI_MSTR_WR_ADDR_HALT_V2		0x1A8
-#define PARF_Q2A_FLUSH				0x1AC
-#define PARF_LTSSM				0x1B0
+#define PARF_AXI_MSTR_WR_ADDR_HALT_V2		0x1a8
+#define PARF_Q2A_FLUSH				0x1ac
+#define PARF_LTSSM				0x1b0
 #define PARF_SID_OFFSET				0x234
-#define PARF_BDF_TRANSLATE_CFG			0x24C
+#define PARF_BDF_TRANSLATE_CFG			0x24c
 #define PARF_SLV_ADDR_SPACE_SIZE		0x358
 #define PARF_DEVICE_TYPE			0x1000
 #define PARF_BDF_TO_SID_TABLE_N			0x2000
@@ -60,7 +60,7 @@
 /* DBI registers */
 #define AXI_MSTR_RESP_COMP_CTRL0		0x818
 #define AXI_MSTR_RESP_COMP_CTRL1		0x81c
-#define MISC_CONTROL_1_REG			0x8BC
+#define MISC_CONTROL_1_REG			0x8bc
 
 /* PARF_SYS_CTRL register fields */
 #define MAC_PHY_POWERDOWN_IN_P2_D_MUX_EN	BIT(29)
-- 
2.25.1

[PATCH v2 06/17] PCI: qcom: Use bulk reset APIs for handling resets for IP rev 2.1.0

[Manivannan Sadhasivam]

All the resets are asserted and deasserted at the same time. So the bulk
reset APIs can be used to handle them together. This simplifies the code
a lot.

While at it, let's also move the qcom_pcie_resources_2_1_0 struct below
qcom_pcie_resources_1_0_0 to keep it sorted.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
---
 drivers/pci/controller/dwc/pcie-qcom.c | 129 +++++++------------------
 1 file changed, 34 insertions(+), 95 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
index 4179ac973147..2d9116464842 100644
--- a/drivers/pci/controller/dwc/pcie-qcom.c
+++ b/drivers/pci/controller/dwc/pcie-qcom.c
@@ -143,22 +143,8 @@
 
 #define PERST_DELAY_US				1000
 
-#define QCOM_PCIE_2_1_0_MAX_SUPPLY		3
-#define QCOM_PCIE_2_1_0_MAX_CLOCKS		5
-
 #define QCOM_PCIE_CRC8_POLYNOMIAL		(BIT(2) | BIT(1) | BIT(0))
 
-struct qcom_pcie_resources_2_1_0 {
-	struct clk_bulk_data clks[QCOM_PCIE_2_1_0_MAX_CLOCKS];
-	struct reset_control *pci_reset;
-	struct reset_control *axi_reset;
-	struct reset_control *ahb_reset;
-	struct reset_control *por_reset;
-	struct reset_control *phy_reset;
-	struct reset_control *ext_reset;
-	struct regulator_bulk_data supplies[QCOM_PCIE_2_1_0_MAX_SUPPLY];
-};
-
 struct qcom_pcie_resources_1_0_0 {
 	struct clk *iface;
 	struct clk *aux;
@@ -168,6 +154,16 @@ struct qcom_pcie_resources_1_0_0 {
 	struct regulator *vdda;
 };
 
+#define QCOM_PCIE_2_1_0_MAX_CLOCKS		5
+#define QCOM_PCIE_2_1_0_MAX_RESETS		6
+#define QCOM_PCIE_2_1_0_MAX_SUPPLY		3
+struct qcom_pcie_resources_2_1_0 {
+	struct clk_bulk_data clks[QCOM_PCIE_2_1_0_MAX_CLOCKS];
+	struct reset_control_bulk_data resets[QCOM_PCIE_2_1_0_MAX_RESETS];
+	int num_resets;
+	struct regulator_bulk_data supplies[QCOM_PCIE_2_1_0_MAX_SUPPLY];
+};
+
 #define QCOM_PCIE_2_3_2_MAX_SUPPLY	2
 struct qcom_pcie_resources_2_3_2 {
 	struct clk *aux_clk;
@@ -295,6 +291,7 @@ static int qcom_pcie_get_resources_2_1_0(struct qcom_pcie *pcie)
 	struct qcom_pcie_resources_2_1_0 *res = &pcie->res.v2_1_0;
 	struct dw_pcie *pci = pcie->pci;
 	struct device *dev = pci->dev;
+	bool is_apq = of_device_is_compatible(dev->of_node, "qcom,pcie-apq8064");
 	int ret;
 
 	res->supplies[0].supply = "vdda";
@@ -321,28 +318,20 @@ static int qcom_pcie_get_resources_2_1_0(struct qcom_pcie *pcie)
 	if (ret < 0)
 		return ret;
 
-	res->pci_reset = devm_reset_control_get_exclusive(dev, "pci");
-	if (IS_ERR(res->pci_reset))
-		return PTR_ERR(res->pci_reset);
-
-	res->axi_reset = devm_reset_control_get_exclusive(dev, "axi");
-	if (IS_ERR(res->axi_reset))
-		return PTR_ERR(res->axi_reset);
-
-	res->ahb_reset = devm_reset_control_get_exclusive(dev, "ahb");
-	if (IS_ERR(res->ahb_reset))
-		return PTR_ERR(res->ahb_reset);
+	res->resets[0].id = "pci";
+	res->resets[1].id = "axi";
+	res->resets[2].id = "ahb";
+	res->resets[3].id = "por";
+	res->resets[4].id = "phy";
+	res->resets[5].id = "ext";
 
-	res->por_reset = devm_reset_control_get_exclusive(dev, "por");
-	if (IS_ERR(res->por_reset))
-		return PTR_ERR(res->por_reset);
-
-	res->ext_reset = devm_reset_control_get_optional_exclusive(dev, "ext");
-	if (IS_ERR(res->ext_reset))
-		return PTR_ERR(res->ext_reset);
+	/* ext is optional on APQ8016 */
+	res->num_resets = is_apq ? 5 : 6;
+	ret = devm_reset_control_bulk_get_exclusive(dev, res->num_resets, res->resets);
+	if (ret < 0)
+		return ret;
 
-	res->phy_reset = devm_reset_control_get_exclusive(dev, "phy");
-	return PTR_ERR_OR_ZERO(res->phy_reset);
+	return 0;
 }
 
 static void qcom_pcie_deinit_2_1_0(struct qcom_pcie *pcie)
@@ -350,12 +339,7 @@ static void qcom_pcie_deinit_2_1_0(struct qcom_pcie *pcie)
 	struct qcom_pcie_resources_2_1_0 *res = &pcie->res.v2_1_0;
 
 	clk_bulk_disable_unprepare(ARRAY_SIZE(res->clks), res->clks);
-	reset_control_assert(res->pci_reset);
-	reset_control_assert(res->axi_reset);
-	reset_control_assert(res->ahb_reset);
-	reset_control_assert(res->por_reset);
-	reset_control_assert(res->ext_reset);
-	reset_control_assert(res->phy_reset);
+	reset_control_bulk_assert(res->num_resets, res->resets);
 
 	writel(1, pcie->parf + PARF_PHY_CTRL);
 
@@ -370,12 +354,11 @@ static int qcom_pcie_init_2_1_0(struct qcom_pcie *pcie)
 	int ret;
 
 	/* reset the PCIe interface as uboot can leave it undefined state */
-	reset_control_assert(res->pci_reset);
-	reset_control_assert(res->axi_reset);
-	reset_control_assert(res->ahb_reset);
-	reset_control_assert(res->por_reset);
-	reset_control_assert(res->ext_reset);
-	reset_control_assert(res->phy_reset);
+	ret = reset_control_bulk_assert(res->num_resets, res->resets);
+	if (ret < 0) {
+		dev_err(dev, "cannot assert resets\n");
+		return ret;
+	}
 
 	ret = regulator_bulk_enable(ARRAY_SIZE(res->supplies), res->supplies);
 	if (ret < 0) {
@@ -383,58 +366,14 @@ static int qcom_pcie_init_2_1_0(struct qcom_pcie *pcie)
 		return ret;
 	}
 
-	ret = reset_control_deassert(res->ahb_reset);
-	if (ret) {
-		dev_err(dev, "cannot deassert ahb reset\n");
-		goto err_deassert_ahb;
-	}
-
-	ret = reset_control_deassert(res->ext_reset);
-	if (ret) {
-		dev_err(dev, "cannot deassert ext reset\n");
-		goto err_deassert_ext;
-	}
-
-	ret = reset_control_deassert(res->phy_reset);
-	if (ret) {
-		dev_err(dev, "cannot deassert phy reset\n");
-		goto err_deassert_phy;
-	}
-
-	ret = reset_control_deassert(res->pci_reset);
-	if (ret) {
-		dev_err(dev, "cannot deassert pci reset\n");
-		goto err_deassert_pci;
-	}
-
-	ret = reset_control_deassert(res->por_reset);
-	if (ret) {
-		dev_err(dev, "cannot deassert por reset\n");
-		goto err_deassert_por;
-	}
-
-	ret = reset_control_deassert(res->axi_reset);
-	if (ret) {
-		dev_err(dev, "cannot deassert axi reset\n");
-		goto err_deassert_axi;
+	ret = reset_control_bulk_deassert(res->num_resets, res->resets);
+	if (ret < 0) {
+		dev_err(dev, "cannot deassert resets\n");
+		regulator_bulk_disable(ARRAY_SIZE(res->supplies), res->supplies);
+		return ret;
 	}
 
 	return 0;
-
-err_deassert_axi:
-	reset_control_assert(res->por_reset);
-err_deassert_por:
-	reset_control_assert(res->pci_reset);
-err_deassert_pci:
-	reset_control_assert(res->phy_reset);
-err_deassert_phy:
-	reset_control_assert(res->ext_reset);
-err_deassert_ext:
-	reset_control_assert(res->ahb_reset);
-err_deassert_ahb:
-	regulator_bulk_disable(ARRAY_SIZE(res->supplies), res->supplies);
-
-	return ret;
 }
 
 static int qcom_pcie_post_init_2_1_0(struct qcom_pcie *pcie)
-- 
2.25.1

[PATCH v2 07/17] PCI: qcom: Use bulk clock APIs for handling clocks for IP rev 1.0.0

[Manivannan Sadhasivam]

All the clocks are enabled and disabled at the same time. So the bulk clock
APIs can be used to handle them together. This simplifies the code a lot.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
---
 drivers/pci/controller/dwc/pcie-qcom.c | 72 +++++++-------------------
 1 file changed, 19 insertions(+), 53 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
index 2d9116464842..0bb27d3c95a0 100644
--- a/drivers/pci/controller/dwc/pcie-qcom.c
+++ b/drivers/pci/controller/dwc/pcie-qcom.c
@@ -145,11 +145,9 @@
 
 #define QCOM_PCIE_CRC8_POLYNOMIAL		(BIT(2) | BIT(1) | BIT(0))
 
+#define QCOM_PCIE_1_0_0_MAX_CLOCKS		4
 struct qcom_pcie_resources_1_0_0 {
-	struct clk *iface;
-	struct clk *aux;
-	struct clk *master_bus;
-	struct clk *slave_bus;
+	struct clk_bulk_data clks[QCOM_PCIE_1_0_0_MAX_CLOCKS];
 	struct reset_control *core;
 	struct regulator *vdda;
 };
@@ -439,26 +437,20 @@ static int qcom_pcie_get_resources_1_0_0(struct qcom_pcie *pcie)
 	struct qcom_pcie_resources_1_0_0 *res = &pcie->res.v1_0_0;
 	struct dw_pcie *pci = pcie->pci;
 	struct device *dev = pci->dev;
+	int ret;
 
 	res->vdda = devm_regulator_get(dev, "vdda");
 	if (IS_ERR(res->vdda))
 		return PTR_ERR(res->vdda);
 
-	res->iface = devm_clk_get(dev, "iface");
-	if (IS_ERR(res->iface))
-		return PTR_ERR(res->iface);
-
-	res->aux = devm_clk_get(dev, "aux");
-	if (IS_ERR(res->aux))
-		return PTR_ERR(res->aux);
-
-	res->master_bus = devm_clk_get(dev, "master_bus");
-	if (IS_ERR(res->master_bus))
-		return PTR_ERR(res->master_bus);
+	res->clks[0].id = "iface";
+	res->clks[1].id = "aux";
+	res->clks[2].id = "master_bus";
+	res->clks[3].id = "slave_bus";
 
-	res->slave_bus = devm_clk_get(dev, "slave_bus");
-	if (IS_ERR(res->slave_bus))
-		return PTR_ERR(res->slave_bus);
+	ret = devm_clk_bulk_get(dev, ARRAY_SIZE(res->clks), res->clks);
+	if (ret < 0)
+		return ret;
 
 	res->core = devm_reset_control_get_exclusive(dev, "core");
 	return PTR_ERR_OR_ZERO(res->core);
@@ -469,10 +461,7 @@ static void qcom_pcie_deinit_1_0_0(struct qcom_pcie *pcie)
 	struct qcom_pcie_resources_1_0_0 *res = &pcie->res.v1_0_0;
 
 	reset_control_assert(res->core);
-	clk_disable_unprepare(res->slave_bus);
-	clk_disable_unprepare(res->master_bus);
-	clk_disable_unprepare(res->iface);
-	clk_disable_unprepare(res->aux);
+	clk_bulk_disable_unprepare(ARRAY_SIZE(res->clks), res->clks);
 	regulator_disable(res->vdda);
 }
 
@@ -489,46 +478,23 @@ static int qcom_pcie_init_1_0_0(struct qcom_pcie *pcie)
 		return ret;
 	}
 
-	ret = clk_prepare_enable(res->aux);
-	if (ret) {
-		dev_err(dev, "cannot prepare/enable aux clock\n");
-		goto err_res;
-	}
-
-	ret = clk_prepare_enable(res->iface);
-	if (ret) {
-		dev_err(dev, "cannot prepare/enable iface clock\n");
-		goto err_aux;
-	}
-
-	ret = clk_prepare_enable(res->master_bus);
-	if (ret) {
-		dev_err(dev, "cannot prepare/enable master_bus clock\n");
-		goto err_iface;
-	}
-
-	ret = clk_prepare_enable(res->slave_bus);
+	ret = clk_bulk_prepare_enable(ARRAY_SIZE(res->clks), res->clks);
 	if (ret) {
-		dev_err(dev, "cannot prepare/enable slave_bus clock\n");
-		goto err_master;
+		dev_err(dev, "cannot prepare/enable clocks\n");
+		goto err_assert_reset;
 	}
 
 	ret = regulator_enable(res->vdda);
 	if (ret) {
 		dev_err(dev, "cannot enable vdda regulator\n");
-		goto err_slave;
+		goto err_disable_clks;
 	}
 
 	return 0;
-err_slave:
-	clk_disable_unprepare(res->slave_bus);
-err_master:
-	clk_disable_unprepare(res->master_bus);
-err_iface:
-	clk_disable_unprepare(res->iface);
-err_aux:
-	clk_disable_unprepare(res->aux);
-err_res:
+
+err_disable_clks:
+	clk_bulk_disable_unprepare(ARRAY_SIZE(res->clks), res->clks);
+err_assert_reset:
 	reset_control_assert(res->core);
 
 	return ret;
-- 
2.25.1

[PATCH v2 08/17] PCI: qcom: Use bulk clock APIs for handling clocks for IP rev 2.3.2

[Manivannan Sadhasivam]

All the clocks are enabled and disabled at the same time. So the bulk clock
APIs can be used to handle them together. This simplifies the code a lot.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
---
 drivers/pci/controller/dwc/pcie-qcom.c | 72 ++++++--------------------
 1 file changed, 15 insertions(+), 57 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
index 0bb27d3c95a0..939973733a1e 100644
--- a/drivers/pci/controller/dwc/pcie-qcom.c
+++ b/drivers/pci/controller/dwc/pcie-qcom.c
@@ -162,12 +162,10 @@ struct qcom_pcie_resources_2_1_0 {
 	struct regulator_bulk_data supplies[QCOM_PCIE_2_1_0_MAX_SUPPLY];
 };
 
-#define QCOM_PCIE_2_3_2_MAX_SUPPLY	2
+#define QCOM_PCIE_2_3_2_MAX_CLOCKS		4
+#define QCOM_PCIE_2_3_2_MAX_SUPPLY		2
 struct qcom_pcie_resources_2_3_2 {
-	struct clk *aux_clk;
-	struct clk *master_clk;
-	struct clk *slave_clk;
-	struct clk *cfg_clk;
+	struct clk_bulk_data clks[QCOM_PCIE_2_3_2_MAX_CLOCKS];
 	struct regulator_bulk_data supplies[QCOM_PCIE_2_3_2_MAX_SUPPLY];
 };
 
@@ -539,21 +537,14 @@ static int qcom_pcie_get_resources_2_3_2(struct qcom_pcie *pcie)
 	if (ret)
 		return ret;
 
-	res->aux_clk = devm_clk_get(dev, "aux");
-	if (IS_ERR(res->aux_clk))
-		return PTR_ERR(res->aux_clk);
-
-	res->cfg_clk = devm_clk_get(dev, "cfg");
-	if (IS_ERR(res->cfg_clk))
-		return PTR_ERR(res->cfg_clk);
-
-	res->master_clk = devm_clk_get(dev, "bus_master");
-	if (IS_ERR(res->master_clk))
-		return PTR_ERR(res->master_clk);
+	res->clks[0].id = "aux";
+	res->clks[1].id = "cfg";
+	res->clks[2].id = "bus_master";
+	res->clks[3].id = "bus_slave";
 
-	res->slave_clk = devm_clk_get(dev, "bus_slave");
-	if (IS_ERR(res->slave_clk))
-		return PTR_ERR(res->slave_clk);
+	ret = devm_clk_bulk_get(dev, ARRAY_SIZE(res->clks), res->clks);
+	if (ret < 0)
+		return ret;
 
 	return 0;
 }
@@ -562,11 +553,7 @@ static void qcom_pcie_deinit_2_3_2(struct qcom_pcie *pcie)
 {
 	struct qcom_pcie_resources_2_3_2 *res = &pcie->res.v2_3_2;
 
-	clk_disable_unprepare(res->slave_clk);
-	clk_disable_unprepare(res->master_clk);
-	clk_disable_unprepare(res->cfg_clk);
-	clk_disable_unprepare(res->aux_clk);
-
+	clk_bulk_disable_unprepare(ARRAY_SIZE(res->clks), res->clks);
 	regulator_bulk_disable(ARRAY_SIZE(res->supplies), res->supplies);
 }
 
@@ -583,43 +570,14 @@ static int qcom_pcie_init_2_3_2(struct qcom_pcie *pcie)
 		return ret;
 	}
 
-	ret = clk_prepare_enable(res->aux_clk);
-	if (ret) {
-		dev_err(dev, "cannot prepare/enable aux clock\n");
-		goto err_aux_clk;
-	}
-
-	ret = clk_prepare_enable(res->cfg_clk);
-	if (ret) {
-		dev_err(dev, "cannot prepare/enable cfg clock\n");
-		goto err_cfg_clk;
-	}
-
-	ret = clk_prepare_enable(res->master_clk);
-	if (ret) {
-		dev_err(dev, "cannot prepare/enable master clock\n");
-		goto err_master_clk;
-	}
-
-	ret = clk_prepare_enable(res->slave_clk);
+	ret = clk_bulk_prepare_enable(ARRAY_SIZE(res->clks), res->clks);
 	if (ret) {
-		dev_err(dev, "cannot prepare/enable slave clock\n");
-		goto err_slave_clk;
+		dev_err(dev, "cannot prepare/enable clocks\n");
+		regulator_bulk_disable(ARRAY_SIZE(res->supplies), res->supplies);
+		return ret;
 	}
 
 	return 0;
-
-err_slave_clk:
-	clk_disable_unprepare(res->master_clk);
-err_master_clk:
-	clk_disable_unprepare(res->cfg_clk);
-err_cfg_clk:
-	clk_disable_unprepare(res->aux_clk);
-
-err_aux_clk:
-	regulator_bulk_disable(ARRAY_SIZE(res->supplies), res->supplies);
-
-	return ret;
 }
 
 static int qcom_pcie_post_init_2_3_2(struct qcom_pcie *pcie)
-- 
2.25.1

[PATCH v2 09/17] PCI: qcom: Use bulk clock APIs for handling clocks for IP rev 2.3.3

[Manivannan Sadhasivam]

All the clocks are enabled and disabled at the same time. So the bulk clock
APIs can be used to handle them together. This simplifies the code a lot.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
---
 drivers/pci/controller/dwc/pcie-qcom.c | 88 ++++++--------------------
 1 file changed, 20 insertions(+), 68 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
index 939973733a1e..6b83e3627336 100644
--- a/drivers/pci/controller/dwc/pcie-qcom.c
+++ b/drivers/pci/controller/dwc/pcie-qcom.c
@@ -169,6 +169,12 @@ struct qcom_pcie_resources_2_3_2 {
 	struct regulator_bulk_data supplies[QCOM_PCIE_2_3_2_MAX_SUPPLY];
 };
 
+#define QCOM_PCIE_2_3_3_MAX_CLOCKS		5
+struct qcom_pcie_resources_2_3_3 {
+	struct clk_bulk_data clks[QCOM_PCIE_2_3_3_MAX_CLOCKS];
+	struct reset_control *rst[7];
+};
+
 #define QCOM_PCIE_2_4_0_MAX_CLOCKS	4
 struct qcom_pcie_resources_2_4_0 {
 	struct clk_bulk_data clks[QCOM_PCIE_2_4_0_MAX_CLOCKS];
@@ -187,15 +193,6 @@ struct qcom_pcie_resources_2_4_0 {
 	struct reset_control *phy_ahb_reset;
 };
 
-struct qcom_pcie_resources_2_3_3 {
-	struct clk *iface;
-	struct clk *axi_m_clk;
-	struct clk *axi_s_clk;
-	struct clk *ahb_clk;
-	struct clk *aux_clk;
-	struct reset_control *rst[7];
-};
-
 /* 6 clocks typically, 7 for sm8250 */
 struct qcom_pcie_resources_2_7_0 {
 	struct clk_bulk_data clks[12];
@@ -896,26 +893,17 @@ static int qcom_pcie_get_resources_2_3_3(struct qcom_pcie *pcie)
 	const char *rst_names[] = { "axi_m", "axi_s", "pipe",
 				    "axi_m_sticky", "sticky",
 				    "ahb", "sleep", };
+	int ret;
 
-	res->iface = devm_clk_get(dev, "iface");
-	if (IS_ERR(res->iface))
-		return PTR_ERR(res->iface);
-
-	res->axi_m_clk = devm_clk_get(dev, "axi_m");
-	if (IS_ERR(res->axi_m_clk))
-		return PTR_ERR(res->axi_m_clk);
-
-	res->axi_s_clk = devm_clk_get(dev, "axi_s");
-	if (IS_ERR(res->axi_s_clk))
-		return PTR_ERR(res->axi_s_clk);
-
-	res->ahb_clk = devm_clk_get(dev, "ahb");
-	if (IS_ERR(res->ahb_clk))
-		return PTR_ERR(res->ahb_clk);
+	res->clks[0].id = "iface";
+	res->clks[1].id = "axi_m";
+	res->clks[2].id = "axi_s";
+	res->clks[3].id = "ahb";
+	res->clks[4].id = "aux";
 
-	res->aux_clk = devm_clk_get(dev, "aux");
-	if (IS_ERR(res->aux_clk))
-		return PTR_ERR(res->aux_clk);
+	ret = devm_clk_bulk_get(dev, ARRAY_SIZE(res->clks), res->clks);
+	if (ret < 0)
+		return ret;
 
 	for (i = 0; i < ARRAY_SIZE(rst_names); i++) {
 		res->rst[i] = devm_reset_control_get(dev, rst_names[i]);
@@ -930,11 +918,7 @@ static void qcom_pcie_deinit_2_3_3(struct qcom_pcie *pcie)
 {
 	struct qcom_pcie_resources_2_3_3 *res = &pcie->res.v2_3_3;
 
-	clk_disable_unprepare(res->iface);
-	clk_disable_unprepare(res->axi_m_clk);
-	clk_disable_unprepare(res->axi_s_clk);
-	clk_disable_unprepare(res->ahb_clk);
-	clk_disable_unprepare(res->aux_clk);
+	clk_bulk_disable_unprepare(ARRAY_SIZE(res->clks), res->clks);
 }
 
 static int qcom_pcie_init_2_3_3(struct qcom_pcie *pcie)
@@ -969,47 +953,15 @@ static int qcom_pcie_init_2_3_3(struct qcom_pcie *pcie)
 	 */
 	usleep_range(2000, 2500);
 
-	ret = clk_prepare_enable(res->iface);
-	if (ret) {
-		dev_err(dev, "cannot prepare/enable core clock\n");
-		goto err_clk_iface;
-	}
-
-	ret = clk_prepare_enable(res->axi_m_clk);
-	if (ret) {
-		dev_err(dev, "cannot prepare/enable core clock\n");
-		goto err_clk_axi_m;
-	}
-
-	ret = clk_prepare_enable(res->axi_s_clk);
-	if (ret) {
-		dev_err(dev, "cannot prepare/enable axi slave clock\n");
-		goto err_clk_axi_s;
-	}
-
-	ret = clk_prepare_enable(res->ahb_clk);
-	if (ret) {
-		dev_err(dev, "cannot prepare/enable ahb clock\n");
-		goto err_clk_ahb;
-	}
-
-	ret = clk_prepare_enable(res->aux_clk);
+	ret = clk_bulk_prepare_enable(ARRAY_SIZE(res->clks), res->clks);
 	if (ret) {
-		dev_err(dev, "cannot prepare/enable aux clock\n");
-		goto err_clk_aux;
+		dev_err(dev, "cannot prepare/enable clocks\n");
+		goto err_assert_resets;
 	}
 
 	return 0;
 
-err_clk_aux:
-	clk_disable_unprepare(res->ahb_clk);
-err_clk_ahb:
-	clk_disable_unprepare(res->axi_s_clk);
-err_clk_axi_s:
-	clk_disable_unprepare(res->axi_m_clk);
-err_clk_axi_m:
-	clk_disable_unprepare(res->iface);
-err_clk_iface:
+err_assert_resets:
 	/*
 	 * Not checking for failure, will anyway return
 	 * the original failure in 'ret'.
-- 
2.25.1

[PATCH v2 10/17] PCI: qcom: Use bulk reset APIs for handling resets for IP rev 2.3.3

[Manivannan Sadhasivam]

All the resets are asserted and deasserted at the same time. So the bulk
reset APIs can be used to handle them together. This simplifies the code
a lot.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
---
 drivers/pci/controller/dwc/pcie-qcom.c | 49 ++++++++++++--------------
 1 file changed, 23 insertions(+), 26 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
index 6b83e3627336..8c39fc554a89 100644
--- a/drivers/pci/controller/dwc/pcie-qcom.c
+++ b/drivers/pci/controller/dwc/pcie-qcom.c
@@ -170,9 +170,10 @@ struct qcom_pcie_resources_2_3_2 {
 };
 
 #define QCOM_PCIE_2_3_3_MAX_CLOCKS		5
+#define QCOM_PCIE_2_3_3_MAX_RESETS		7
 struct qcom_pcie_resources_2_3_3 {
 	struct clk_bulk_data clks[QCOM_PCIE_2_3_3_MAX_CLOCKS];
-	struct reset_control *rst[7];
+	struct reset_control_bulk_data rst[QCOM_PCIE_2_3_3_MAX_RESETS];
 };
 
 #define QCOM_PCIE_2_4_0_MAX_CLOCKS	4
@@ -889,10 +890,6 @@ static int qcom_pcie_get_resources_2_3_3(struct qcom_pcie *pcie)
 	struct qcom_pcie_resources_2_3_3 *res = &pcie->res.v2_3_3;
 	struct dw_pcie *pci = pcie->pci;
 	struct device *dev = pci->dev;
-	int i;
-	const char *rst_names[] = { "axi_m", "axi_s", "pipe",
-				    "axi_m_sticky", "sticky",
-				    "ahb", "sleep", };
 	int ret;
 
 	res->clks[0].id = "iface";
@@ -905,11 +902,17 @@ static int qcom_pcie_get_resources_2_3_3(struct qcom_pcie *pcie)
 	if (ret < 0)
 		return ret;
 
-	for (i = 0; i < ARRAY_SIZE(rst_names); i++) {
-		res->rst[i] = devm_reset_control_get(dev, rst_names[i]);
-		if (IS_ERR(res->rst[i]))
-			return PTR_ERR(res->rst[i]);
-	}
+	res->rst[0].id = "axi_m";
+	res->rst[1].id = "axi_s";
+	res->rst[2].id = "pipe";
+	res->rst[3].id = "axi_m_sticky";
+	res->rst[4].id = "sticky";
+	res->rst[5].id = "ahb";
+	res->rst[6].id = "sleep";
+
+	ret = devm_reset_control_bulk_get_exclusive(dev, ARRAY_SIZE(res->rst), res->rst);
+	if (ret < 0)
+		return ret;
 
 	return 0;
 }
@@ -926,25 +929,20 @@ static int qcom_pcie_init_2_3_3(struct qcom_pcie *pcie)
 	struct qcom_pcie_resources_2_3_3 *res = &pcie->res.v2_3_3;
 	struct dw_pcie *pci = pcie->pci;
 	struct device *dev = pci->dev;
-	int i, ret;
+	int ret;
 
-	for (i = 0; i < ARRAY_SIZE(res->rst); i++) {
-		ret = reset_control_assert(res->rst[i]);
-		if (ret) {
-			dev_err(dev, "reset #%d assert failed (%d)\n", i, ret);
-			return ret;
-		}
+	ret = reset_control_bulk_assert(ARRAY_SIZE(res->rst), res->rst);
+	if (ret < 0) {
+		dev_err(dev, "cannot assert resets\n");
+		return ret;
 	}
 
 	usleep_range(2000, 2500);
 
-	for (i = 0; i < ARRAY_SIZE(res->rst); i++) {
-		ret = reset_control_deassert(res->rst[i]);
-		if (ret) {
-			dev_err(dev, "reset #%d deassert failed (%d)\n", i,
-				ret);
-			return ret;
-		}
+	ret = reset_control_bulk_deassert(ARRAY_SIZE(res->rst), res->rst);
+	if (ret < 0) {
+		dev_err(dev, "cannot deassert resets\n");
+		return ret;
 	}
 
 	/*
@@ -966,8 +964,7 @@ static int qcom_pcie_init_2_3_3(struct qcom_pcie *pcie)
 	 * Not checking for failure, will anyway return
 	 * the original failure in 'ret'.
 	 */
-	for (i = 0; i < ARRAY_SIZE(res->rst); i++)
-		reset_control_assert(res->rst[i]);
+	reset_control_bulk_assert(ARRAY_SIZE(res->rst), res->rst);
 
 	return ret;
 }
-- 
2.25.1

[PATCH v2 11/17] PCI: qcom: Use bulk reset APIs for handling resets for IP rev 2.4.0

[Manivannan Sadhasivam]

All the resets are asserted and deasserted at the same time. So the bulk
reset APIs can be used to handle them together. This simplifies the code
a lot.

It should be noted that there were delays in-between the reset asserts and
deasserts. But going by the config used by other revisions, those delays
are not really necessary. So a single delay after all asserts and one after
deasserts is used.

The total number of resets supported is 12 but only ipq4019 is using all of
them.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
---
 drivers/pci/controller/dwc/pcie-qcom.c | 238 ++++---------------------
 1 file changed, 30 insertions(+), 208 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
index 8c39fc554a89..ed43e03b972f 100644
--- a/drivers/pci/controller/dwc/pcie-qcom.c
+++ b/drivers/pci/controller/dwc/pcie-qcom.c
@@ -176,22 +176,13 @@ struct qcom_pcie_resources_2_3_3 {
 	struct reset_control_bulk_data rst[QCOM_PCIE_2_3_3_MAX_RESETS];
 };
 
-#define QCOM_PCIE_2_4_0_MAX_CLOCKS	4
+#define QCOM_PCIE_2_4_0_MAX_CLOCKS		4
+#define QCOM_PCIE_2_4_0_MAX_RESETS		12
 struct qcom_pcie_resources_2_4_0 {
 	struct clk_bulk_data clks[QCOM_PCIE_2_4_0_MAX_CLOCKS];
 	int num_clks;
-	struct reset_control *axi_m_reset;
-	struct reset_control *axi_s_reset;
-	struct reset_control *pipe_reset;
-	struct reset_control *axi_m_vmid_reset;
-	struct reset_control *axi_s_xpu_reset;
-	struct reset_control *parf_reset;
-	struct reset_control *phy_reset;
-	struct reset_control *axi_m_sticky_reset;
-	struct reset_control *pipe_sticky_reset;
-	struct reset_control *pwr_reset;
-	struct reset_control *ahb_reset;
-	struct reset_control *phy_ahb_reset;
+	struct reset_control_bulk_data resets[QCOM_PCIE_2_4_0_MAX_RESETS];
+	int num_resets;
 };
 
 /* 6 clocks typically, 7 for sm8250 */
@@ -626,65 +617,24 @@ static int qcom_pcie_get_resources_2_4_0(struct qcom_pcie *pcie)
 	if (ret < 0)
 		return ret;
 
-	res->axi_m_reset = devm_reset_control_get_exclusive(dev, "axi_m");
-	if (IS_ERR(res->axi_m_reset))
-		return PTR_ERR(res->axi_m_reset);
-
-	res->axi_s_reset = devm_reset_control_get_exclusive(dev, "axi_s");
-	if (IS_ERR(res->axi_s_reset))
-		return PTR_ERR(res->axi_s_reset);
-
-	if (is_ipq) {
-		/*
-		 * These resources relates to the PHY or are secure clocks, but
-		 * are controlled here for IPQ4019
-		 */
-		res->pipe_reset = devm_reset_control_get_exclusive(dev, "pipe");
-		if (IS_ERR(res->pipe_reset))
-			return PTR_ERR(res->pipe_reset);
-
-		res->axi_m_vmid_reset = devm_reset_control_get_exclusive(dev,
-									 "axi_m_vmid");
-		if (IS_ERR(res->axi_m_vmid_reset))
-			return PTR_ERR(res->axi_m_vmid_reset);
-
-		res->axi_s_xpu_reset = devm_reset_control_get_exclusive(dev,
-									"axi_s_xpu");
-		if (IS_ERR(res->axi_s_xpu_reset))
-			return PTR_ERR(res->axi_s_xpu_reset);
-
-		res->parf_reset = devm_reset_control_get_exclusive(dev, "parf");
-		if (IS_ERR(res->parf_reset))
-			return PTR_ERR(res->parf_reset);
-
-		res->phy_reset = devm_reset_control_get_exclusive(dev, "phy");
-		if (IS_ERR(res->phy_reset))
-			return PTR_ERR(res->phy_reset);
-	}
-
-	res->axi_m_sticky_reset = devm_reset_control_get_exclusive(dev,
-								   "axi_m_sticky");
-	if (IS_ERR(res->axi_m_sticky_reset))
-		return PTR_ERR(res->axi_m_sticky_reset);
-
-	res->pipe_sticky_reset = devm_reset_control_get_exclusive(dev,
-								  "pipe_sticky");
-	if (IS_ERR(res->pipe_sticky_reset))
-		return PTR_ERR(res->pipe_sticky_reset);
-
-	res->pwr_reset = devm_reset_control_get_exclusive(dev, "pwr");
-	if (IS_ERR(res->pwr_reset))
-		return PTR_ERR(res->pwr_reset);
-
-	res->ahb_reset = devm_reset_control_get_exclusive(dev, "ahb");
-	if (IS_ERR(res->ahb_reset))
-		return PTR_ERR(res->ahb_reset);
+	res->resets[0].id = "axi_m";
+	res->resets[1].id = "axi_s";
+	res->resets[2].id = "axi_m_sticky";
+	res->resets[3].id = "pipe_sticky";
+	res->resets[4].id = "pwr";
+	res->resets[5].id = "ahb";
+	res->resets[6].id = "pipe";
+	res->resets[7].id = "axi_m_vmid";
+	res->resets[8].id = "axi_s_xpu";
+	res->resets[9].id = "parf";
+	res->resets[10].id = "phy";
+	res->resets[11].id = "phy_ahb";
+
+	res->num_resets = is_ipq ? 12 : 6;
 
-	if (is_ipq) {
-		res->phy_ahb_reset = devm_reset_control_get_exclusive(dev, "phy_ahb");
-		if (IS_ERR(res->phy_ahb_reset))
-			return PTR_ERR(res->phy_ahb_reset);
-	}
+	ret = devm_reset_control_bulk_get_exclusive(dev, res->num_resets, res->resets);
+	if (ret < 0)
+		return ret;
 
 	return 0;
 }
@@ -693,15 +643,7 @@ static void qcom_pcie_deinit_2_4_0(struct qcom_pcie *pcie)
 {
 	struct qcom_pcie_resources_2_4_0 *res = &pcie->res.v2_4_0;
 
-	reset_control_assert(res->axi_m_reset);
-	reset_control_assert(res->axi_s_reset);
-	reset_control_assert(res->pipe_reset);
-	reset_control_assert(res->pipe_sticky_reset);
-	reset_control_assert(res->phy_reset);
-	reset_control_assert(res->phy_ahb_reset);
-	reset_control_assert(res->axi_m_sticky_reset);
-	reset_control_assert(res->pwr_reset);
-	reset_control_assert(res->ahb_reset);
+	reset_control_bulk_assert(res->num_resets, res->resets);
 	clk_bulk_disable_unprepare(res->num_clks, res->clks);
 }
 
@@ -712,149 +654,29 @@ static int qcom_pcie_init_2_4_0(struct qcom_pcie *pcie)
 	struct device *dev = pci->dev;
 	int ret;
 
-	ret = reset_control_assert(res->axi_m_reset);
-	if (ret) {
-		dev_err(dev, "cannot assert axi master reset\n");
-		return ret;
-	}
-
-	ret = reset_control_assert(res->axi_s_reset);
-	if (ret) {
-		dev_err(dev, "cannot assert axi slave reset\n");
-		return ret;
-	}
-
-	usleep_range(10000, 12000);
-
-	ret = reset_control_assert(res->pipe_reset);
-	if (ret) {
-		dev_err(dev, "cannot assert pipe reset\n");
-		return ret;
-	}
-
-	ret = reset_control_assert(res->pipe_sticky_reset);
-	if (ret) {
-		dev_err(dev, "cannot assert pipe sticky reset\n");
-		return ret;
-	}
-
-	ret = reset_control_assert(res->phy_reset);
-	if (ret) {
-		dev_err(dev, "cannot assert phy reset\n");
-		return ret;
-	}
-
-	ret = reset_control_assert(res->phy_ahb_reset);
-	if (ret) {
-		dev_err(dev, "cannot assert phy ahb reset\n");
+	ret = reset_control_bulk_assert(res->num_resets, res->resets);
+	if (ret < 0) {
+		dev_err(dev, "cannot assert resets\n");
 		return ret;
 	}
 
 	usleep_range(10000, 12000);
 
-	ret = reset_control_assert(res->axi_m_sticky_reset);
-	if (ret) {
-		dev_err(dev, "cannot assert axi master sticky reset\n");
-		return ret;
-	}
-
-	ret = reset_control_assert(res->pwr_reset);
-	if (ret) {
-		dev_err(dev, "cannot assert power reset\n");
-		return ret;
-	}
-
-	ret = reset_control_assert(res->ahb_reset);
-	if (ret) {
-		dev_err(dev, "cannot assert ahb reset\n");
+	ret = reset_control_bulk_deassert(res->num_resets, res->resets);
+	if (ret < 0) {
+		dev_err(dev, "cannot deassert resets\n");
 		return ret;
 	}
 
 	usleep_range(10000, 12000);
 
-	ret = reset_control_deassert(res->phy_ahb_reset);
+	ret = clk_bulk_prepare_enable(res->num_clks, res->clks);
 	if (ret) {
-		dev_err(dev, "cannot deassert phy ahb reset\n");
+		reset_control_bulk_assert(res->num_resets, res->resets);
 		return ret;
 	}
 
-	ret = reset_control_deassert(res->phy_reset);
-	if (ret) {
-		dev_err(dev, "cannot deassert phy reset\n");
-		goto err_rst_phy;
-	}
-
-	ret = reset_control_deassert(res->pipe_reset);
-	if (ret) {
-		dev_err(dev, "cannot deassert pipe reset\n");
-		goto err_rst_pipe;
-	}
-
-	ret = reset_control_deassert(res->pipe_sticky_reset);
-	if (ret) {
-		dev_err(dev, "cannot deassert pipe sticky reset\n");
-		goto err_rst_pipe_sticky;
-	}
-
-	usleep_range(10000, 12000);
-
-	ret = reset_control_deassert(res->axi_m_reset);
-	if (ret) {
-		dev_err(dev, "cannot deassert axi master reset\n");
-		goto err_rst_axi_m;
-	}
-
-	ret = reset_control_deassert(res->axi_m_sticky_reset);
-	if (ret) {
-		dev_err(dev, "cannot deassert axi master sticky reset\n");
-		goto err_rst_axi_m_sticky;
-	}
-
-	ret = reset_control_deassert(res->axi_s_reset);
-	if (ret) {
-		dev_err(dev, "cannot deassert axi slave reset\n");
-		goto err_rst_axi_s;
-	}
-
-	ret = reset_control_deassert(res->pwr_reset);
-	if (ret) {
-		dev_err(dev, "cannot deassert power reset\n");
-		goto err_rst_pwr;
-	}
-
-	ret = reset_control_deassert(res->ahb_reset);
-	if (ret) {
-		dev_err(dev, "cannot deassert ahb reset\n");
-		goto err_rst_ahb;
-	}
-
-	usleep_range(10000, 12000);
-
-	ret = clk_bulk_prepare_enable(res->num_clks, res->clks);
-	if (ret)
-		goto err_clks;
-
 	return 0;
-
-err_clks:
-	reset_control_assert(res->ahb_reset);
-err_rst_ahb:
-	reset_control_assert(res->pwr_reset);
-err_rst_pwr:
-	reset_control_assert(res->axi_s_reset);
-err_rst_axi_s:
-	reset_control_assert(res->axi_m_sticky_reset);
-err_rst_axi_m_sticky:
-	reset_control_assert(res->axi_m_reset);
-err_rst_axi_m:
-	reset_control_assert(res->pipe_sticky_reset);
-err_rst_pipe_sticky:
-	reset_control_assert(res->pipe_reset);
-err_rst_pipe:
-	reset_control_assert(res->phy_reset);
-err_rst_phy:
-	reset_control_assert(res->phy_ahb_reset);
-	return ret;
 }
 
 static int qcom_pcie_post_init_2_4_0(struct qcom_pcie *pcie)
-- 
2.25.1

[PATCH v2 12/17] PCI: qcom: Use macros for defining total no. of clocks & supplies

[Manivannan Sadhasivam]

To keep uniformity, let's use macros to define the total number of clocks
and supplies in qcom_pcie_resources_{2_7_0/2_9_0} structs.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
---
 drivers/pci/controller/dwc/pcie-qcom.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
index ed43e03b972f..e1180c84f0fa 100644
--- a/drivers/pci/controller/dwc/pcie-qcom.c
+++ b/drivers/pci/controller/dwc/pcie-qcom.c
@@ -185,16 +185,18 @@ struct qcom_pcie_resources_2_4_0 {
 	int num_resets;
 };
 
-/* 6 clocks typically, 7 for sm8250 */
+#define QCOM_PCIE_2_7_0_MAX_CLOCKS		12
+#define QCOM_PCIE_2_7_0_MAX_SUPPLIES		2
 struct qcom_pcie_resources_2_7_0 {
-	struct clk_bulk_data clks[12];
+	struct clk_bulk_data clks[QCOM_PCIE_2_7_0_MAX_CLOCKS];
 	int num_clks;
-	struct regulator_bulk_data supplies[2];
+	struct regulator_bulk_data supplies[QCOM_PCIE_2_7_0_MAX_SUPPLIES];
 	struct reset_control *pci_reset;
 };
 
+#define QCOM_PCIE_2_9_0_MAX_CLOCKS		5
 struct qcom_pcie_resources_2_9_0 {
-	struct clk_bulk_data clks[5];
+	struct clk_bulk_data clks[QCOM_PCIE_2_9_0_MAX_CLOCKS];
 	struct reset_control *rst;
 };
 
-- 
2.25.1

[PATCH v2 13/17] dt-bindings: PCI: qcom: Add "mhi" register region to supported SoCs

[Manivannan Sadhasivam]

"mhi" register region contains the MHI registers that could be used by
the PCIe controller drivers to get debug information like PCIe link
transition counts on newer SoCs.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
---
 Documentation/devicetree/bindings/pci/qcom,pcie.yaml | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/Documentation/devicetree/bindings/pci/qcom,pcie.yaml b/Documentation/devicetree/bindings/pci/qcom,pcie.yaml
index fb32c43dd12d..ecbb0f9efa21 100644
--- a/Documentation/devicetree/bindings/pci/qcom,pcie.yaml
+++ b/Documentation/devicetree/bindings/pci/qcom,pcie.yaml
@@ -44,11 +44,11 @@ properties:
 
   reg:
     minItems: 4
-    maxItems: 5
+    maxItems: 6
 
   reg-names:
     minItems: 4
-    maxItems: 5
+    maxItems: 6
 
   interrupts:
     minItems: 1
@@ -185,13 +185,15 @@ allOf:
       properties:
         reg:
           minItems: 4
-          maxItems: 4
+          maxItems: 5
         reg-names:
+          minItems: 4
           items:
             - const: parf # Qualcomm specific registers
             - const: dbi # DesignWare PCIe registers
             - const: elbi # External local bus interface registers
             - const: config # PCIe configuration space
+            - const: mhi # MHI registers
 
   - if:
       properties:
@@ -209,14 +211,16 @@ allOf:
       properties:
         reg:
           minItems: 5
-          maxItems: 5
+          maxItems: 6
         reg-names:
+          minItems: 5
           items:
             - const: parf # Qualcomm specific registers
             - const: dbi # DesignWare PCIe registers
             - const: elbi # External local bus interface registers
             - const: atu # ATU address space
             - const: config # PCIe configuration space
+            - const: mhi # MHI registers
 
   - if:
       properties:
-- 
2.25.1

[PATCH v2 14/17] arm64: dts: qcom: sdm845: Add "mhi" region to the PCIe nodes

[Manivannan Sadhasivam]

The "mhi" region contains the debug registers that could be used to monitor
the PCIe link transitions.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
---
 arch/arm64/boot/dts/qcom/sdm845.dtsi | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/arch/arm64/boot/dts/qcom/sdm845.dtsi b/arch/arm64/boot/dts/qcom/sdm845.dtsi
index 479859bd8ab3..46caac9acc95 100644
--- a/arch/arm64/boot/dts/qcom/sdm845.dtsi
+++ b/arch/arm64/boot/dts/qcom/sdm845.dtsi
@@ -2282,8 +2282,9 @@ pcie0: pci@1c00000 {
 			reg = <0 0x01c00000 0 0x2000>,
 			      <0 0x60000000 0 0xf1d>,
 			      <0 0x60000f20 0 0xa8>,
-			      <0 0x60100000 0 0x100000>;
-			reg-names = "parf", "dbi", "elbi", "config";
+			      <0 0x60100000 0 0x100000>,
+			      <0 0x01c07000 0 0x1000>;
+			reg-names = "parf", "dbi", "elbi", "config", "mhi";
 			device_type = "pci";
 			linux,pci-domain = <0>;
 			bus-range = <0x00 0xff>;
@@ -2387,8 +2388,9 @@ pcie1: pci@1c08000 {
 			reg = <0 0x01c08000 0 0x2000>,
 			      <0 0x40000000 0 0xf1d>,
 			      <0 0x40000f20 0 0xa8>,
-			      <0 0x40100000 0 0x100000>;
-			reg-names = "parf", "dbi", "elbi", "config";
+			      <0 0x40100000 0 0x100000>,
+			      <0 0x01c0c000 0 0x1000>;
+			reg-names = "parf", "dbi", "elbi", "config", "mhi";
 			device_type = "pci";
 			linux,pci-domain = <1>;
 			bus-range = <0x00 0xff>;
-- 
2.25.1

[PATCH v2 15/17] arm64: dts: qcom: sm8250: Add "mhi" region to the PCIe nodes

[Manivannan Sadhasivam]

The "mhi" region contains the debug registers that could be used to monitor
the PCIe link transitions.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
---
 arch/arm64/boot/dts/qcom/sm8250.dtsi | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/arch/arm64/boot/dts/qcom/sm8250.dtsi b/arch/arm64/boot/dts/qcom/sm8250.dtsi
index 2f0e460acccd..81383e20d3d9 100644
--- a/arch/arm64/boot/dts/qcom/sm8250.dtsi
+++ b/arch/arm64/boot/dts/qcom/sm8250.dtsi
@@ -1824,8 +1824,9 @@ pcie0: pci@1c00000 {
 			      <0 0x60000000 0 0xf1d>,
 			      <0 0x60000f20 0 0xa8>,
 			      <0 0x60001000 0 0x1000>,
-			      <0 0x60100000 0 0x100000>;
-			reg-names = "parf", "dbi", "elbi", "atu", "config";
+			      <0 0x60100000 0 0x100000>,
+			      <0 0x01c03000 0 0x1000>;
+			reg-names = "parf", "dbi", "elbi", "atu", "config", "mhi";
 			device_type = "pci";
 			linux,pci-domain = <0>;
 			bus-range = <0x00 0xff>;
@@ -1933,8 +1934,9 @@ pcie1: pci@1c08000 {
 			      <0 0x40000000 0 0xf1d>,
 			      <0 0x40000f20 0 0xa8>,
 			      <0 0x40001000 0 0x1000>,
-			      <0 0x40100000 0 0x100000>;
-			reg-names = "parf", "dbi", "elbi", "atu", "config";
+			      <0 0x40100000 0 0x100000>,
+			      <0 0x01c0b000 0 0x1000>;
+			reg-names = "parf", "dbi", "elbi", "atu", "config", "mhi";
 			device_type = "pci";
 			linux,pci-domain = <1>;
 			bus-range = <0x00 0xff>;
@@ -2041,8 +2043,9 @@ pcie2: pci@1c10000 {
 			      <0 0x64000000 0 0xf1d>,
 			      <0 0x64000f20 0 0xa8>,
 			      <0 0x64001000 0 0x1000>,
-			      <0 0x64100000 0 0x100000>;
-			reg-names = "parf", "dbi", "elbi", "atu", "config";
+			      <0 0x64100000 0 0x100000>,
+			      <0 0x01c13000 0 0x1000>;
+			reg-names = "parf", "dbi", "elbi", "atu", "config", "mhi";
 			device_type = "pci";
 			linux,pci-domain = <2>;
 			bus-range = <0x00 0xff>;
-- 
2.25.1

[PATCH v2 16/17] arm64: dts: qcom: sc8280xp: Add "mhi" region to the PCIe nodes

[Manivannan Sadhasivam]

The "mhi" region contains the debug registers that could be used to monitor
the PCIe link transitions.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
---
 arch/arm64/boot/dts/qcom/sc8280xp.dtsi | 25 +++++++++++++++----------
 1 file changed, 15 insertions(+), 10 deletions(-)

diff --git a/arch/arm64/boot/dts/qcom/sc8280xp.dtsi b/arch/arm64/boot/dts/qcom/sc8280xp.dtsi
index 0d02599d8867..eb87c3e5d2bc 100644
--- a/arch/arm64/boot/dts/qcom/sc8280xp.dtsi
+++ b/arch/arm64/boot/dts/qcom/sc8280xp.dtsi
@@ -1653,8 +1653,9 @@ pcie4: pcie@1c00000 {
 			      <0x0 0x30000000 0x0 0xf1d>,
 			      <0x0 0x30000f20 0x0 0xa8>,
 			      <0x0 0x30001000 0x0 0x1000>,
-			      <0x0 0x30100000 0x0 0x100000>;
-			reg-names = "parf", "dbi", "elbi", "atu", "config";
+			      <0x0 0x30100000 0x0 0x100000>,
+			      <0x0 0x01c03000 0x0 0x1000>;
+			reg-names = "parf", "dbi", "elbi", "atu", "config", "mhi";
 			#address-cells = <3>;
 			#size-cells = <2>;
 			ranges = <0x01000000 0x0 0x30200000 0x0 0x30200000 0x0 0x100000>,
@@ -1752,8 +1753,9 @@ pcie3b: pcie@1c08000 {
 			      <0x0 0x32000000 0x0 0xf1d>,
 			      <0x0 0x32000f20 0x0 0xa8>,
 			      <0x0 0x32001000 0x0 0x1000>,
-			      <0x0 0x32100000 0x0 0x100000>;
-			reg-names = "parf", "dbi", "elbi", "atu", "config";
+			      <0x0 0x32100000 0x0 0x100000>,
+			      <0x0 0x01c0b000 0x0 0x1000>;
+			reg-names = "parf", "dbi", "elbi", "atu", "config", "mhi";
 			#address-cells = <3>;
 			#size-cells = <2>;
 			ranges = <0x01000000 0x0 0x32200000 0x0 0x32200000 0x0 0x100000>,
@@ -1849,8 +1851,9 @@ pcie3a: pcie@1c10000 {
 			      <0x0 0x34000000 0x0 0xf1d>,
 			      <0x0 0x34000f20 0x0 0xa8>,
 			      <0x0 0x34001000 0x0 0x1000>,
-			      <0x0 0x34100000 0x0 0x100000>;
-			reg-names = "parf", "dbi", "elbi", "atu", "config";
+			      <0x0 0x34100000 0x0 0x100000>,
+			      <0x0 0x01c13000 0x0 0x1000>;
+			reg-names = "parf", "dbi", "elbi", "atu", "config", "mhi";
 			#address-cells = <3>;
 			#size-cells = <2>;
 			ranges = <0x01000000 0x0 0x34200000 0x0 0x34200000 0x0 0x100000>,
@@ -1949,8 +1952,9 @@ pcie2b: pcie@1c18000 {
 			      <0x0 0x38000000 0x0 0xf1d>,
 			      <0x0 0x38000f20 0x0 0xa8>,
 			      <0x0 0x38001000 0x0 0x1000>,
-			      <0x0 0x38100000 0x0 0x100000>;
-			reg-names = "parf", "dbi", "elbi", "atu", "config";
+			      <0x0 0x38100000 0x0 0x100000>,
+			      <0x0 0x01c1b000 0x0 0x1000>;
+			reg-names = "parf", "dbi", "elbi", "atu", "config", "mhi";
 			#address-cells = <3>;
 			#size-cells = <2>;
 			ranges = <0x01000000 0x0 0x38200000 0x0 0x38200000 0x0 0x100000>,
@@ -2046,8 +2050,9 @@ pcie2a: pcie@1c20000 {
 			      <0x0 0x3c000000 0x0 0xf1d>,
 			      <0x0 0x3c000f20 0x0 0xa8>,
 			      <0x0 0x3c001000 0x0 0x1000>,
-			      <0x0 0x3c100000 0x0 0x100000>;
-			reg-names = "parf", "dbi", "elbi", "atu", "config";
+			      <0x0 0x3c100000 0x0 0x100000>,
+			      <0x0 0x01c23000 0x0 0x1000>;
+			reg-names = "parf", "dbi", "elbi", "atu", "config", "mhi";
 			#address-cells = <3>;
 			#size-cells = <2>;
 			ranges = <0x01000000 0x0 0x3c200000 0x0 0x3c200000 0x0 0x100000>,
-- 
2.25.1

[PATCH v2 17/17] PCI: qcom: Expose link transition counts via debugfs

[Manivannan Sadhasivam]

Qualcomm PCIe controllers have debug registers in the MHI region that
count PCIe link transitions. Expose them over debugfs to userspace to
help debug the low power issues.

Note that even though the registers are prefixed as PARF_, they don't
live under the "parf" register region. The register naming is following
the Qualcomm's internal documentation as like other registers.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
---
 drivers/pci/controller/dwc/pcie-qcom.c | 59 ++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)

diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
index e1180c84f0fa..6d9bde64c9e9 100644
--- a/drivers/pci/controller/dwc/pcie-qcom.c
+++ b/drivers/pci/controller/dwc/pcie-qcom.c
@@ -10,6 +10,7 @@
 
 #include <linux/clk.h>
 #include <linux/crc8.h>
+#include <linux/debugfs.h>
 #include <linux/delay.h>
 #include <linux/gpio/consumer.h>
 #include <linux/interconnect.h>
@@ -62,6 +63,13 @@
 #define AXI_MSTR_RESP_COMP_CTRL1		0x81c
 #define MISC_CONTROL_1_REG			0x8bc
 
+/* MHI registers */
+#define PARF_DEBUG_CNT_PM_LINKST_IN_L2		0xc04
+#define PARF_DEBUG_CNT_PM_LINKST_IN_L1		0xc0c
+#define PARF_DEBUG_CNT_PM_LINKST_IN_L0S		0xc10
+#define PARF_DEBUG_CNT_AUX_CLK_IN_L1SUB_L1	0xc84
+#define PARF_DEBUG_CNT_AUX_CLK_IN_L1SUB_L2	0xc88
+
 /* PARF_SYS_CTRL register fields */
 #define MAC_PHY_POWERDOWN_IN_P2_D_MUX_EN	BIT(29)
 #define MST_WAKEUP_EN				BIT(13)
@@ -229,11 +237,13 @@ struct qcom_pcie {
 	struct dw_pcie *pci;
 	void __iomem *parf;			/* DT parf */
 	void __iomem *elbi;			/* DT elbi */
+	void __iomem *mhi;
 	union qcom_pcie_resources res;
 	struct phy *phy;
 	struct gpio_desc *reset;
 	struct icc_path *icc_mem;
 	const struct qcom_pcie_cfg *cfg;
+	struct dentry *debugfs;
 };
 
 #define to_qcom_pcie(x)		dev_get_drvdata((x)->dev)
@@ -1385,6 +1395,37 @@ static void qcom_pcie_icc_update(struct qcom_pcie *pcie)
 	}
 }
 
+static int qcom_pcie_link_transition_count(struct seq_file *s, void *data)
+{
+	struct qcom_pcie *pcie = (struct qcom_pcie *)
+				     dev_get_drvdata(s->private);
+
+	seq_printf(s, "L0s transition count: %u\n",
+		   readl_relaxed(pcie->mhi + PARF_DEBUG_CNT_PM_LINKST_IN_L0S));
+
+	seq_printf(s, "L1 transition count: %u\n",
+		   readl_relaxed(pcie->mhi + PARF_DEBUG_CNT_PM_LINKST_IN_L1));
+
+	seq_printf(s, "L1.1 transition count: %u\n",
+		   readl_relaxed(pcie->mhi + PARF_DEBUG_CNT_AUX_CLK_IN_L1SUB_L1));
+
+	seq_printf(s, "L1.2 transition count: %u\n",
+		   readl_relaxed(pcie->mhi + PARF_DEBUG_CNT_AUX_CLK_IN_L1SUB_L2));
+
+	seq_printf(s, "L2 transition count: %u\n",
+		   readl_relaxed(pcie->mhi + PARF_DEBUG_CNT_PM_LINKST_IN_L2));
+
+	return 0;
+}
+
+static void qcom_pcie_init_debugfs(struct qcom_pcie *pcie)
+{
+	struct dw_pcie *pci = pcie->pci;
+
+	debugfs_create_devm_seqfile(pci->dev, "link_transition_count", pcie->debugfs,
+				    qcom_pcie_link_transition_count);
+}
+
 static int qcom_pcie_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
@@ -1392,6 +1433,7 @@ static int qcom_pcie_probe(struct platform_device *pdev)
 	struct dw_pcie *pci;
 	struct qcom_pcie *pcie;
 	const struct qcom_pcie_cfg *pcie_cfg;
+	char *name;
 	int ret;
 
 	pcie_cfg = of_device_get_match_data(dev);
@@ -1439,6 +1481,12 @@ static int qcom_pcie_probe(struct platform_device *pdev)
 		goto err_pm_runtime_put;
 	}
 
+	pcie->mhi = devm_platform_ioremap_resource_byname(pdev, "mhi");
+	if (IS_ERR(pcie->mhi)) {
+		ret = PTR_ERR(pcie->mhi);
+		goto err_pm_runtime_put;
+	}
+
 	pcie->phy = devm_phy_optional_get(dev, "pciephy");
 	if (IS_ERR(pcie->phy)) {
 		ret = PTR_ERR(pcie->phy);
@@ -1469,8 +1517,19 @@ static int qcom_pcie_probe(struct platform_device *pdev)
 
 	qcom_pcie_icc_update(pcie);
 
+	name = devm_kasprintf(dev, GFP_KERNEL, "%pOFP", dev->of_node);
+	if (!name) {
+		ret = -ENOMEM;
+		goto err_host_deinit;
+	}
+
+	pcie->debugfs = debugfs_create_dir(name, NULL);
+	qcom_pcie_init_debugfs(pcie);
+
 	return 0;
 
+err_host_deinit:
+	dw_pcie_host_deinit(&pcie->pci->pp);
 err_phy_exit:
 	phy_exit(pcie->phy);
 err_pm_runtime_put:
-- 
2.25.1

Re: [PATCH v2 17/17] PCI: qcom: Expose link transition counts via debugfs

[Sricharan Ramabadhran]

On 3/9/2023 2:21 PM, Manivannan Sadhasivam wrote:
> Qualcomm PCIe controllers have debug registers in the MHI region that
> count PCIe link transitions. Expose them over debugfs to userspace to
> help debug the low power issues.
> 
> Note that even though the registers are prefixed as PARF_, they don't
> live under the "parf" register region. The register naming is following
> the Qualcomm's internal documentation as like other registers.
> 
> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
> ---
>   drivers/pci/controller/dwc/pcie-qcom.c | 59 ++++++++++++++++++++++++++
>   1 file changed, 59 insertions(+)
> 
> diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
> index e1180c84f0fa..6d9bde64c9e9 100644
> --- a/drivers/pci/controller/dwc/pcie-qcom.c
> +++ b/drivers/pci/controller/dwc/pcie-qcom.c
> @@ -10,6 +10,7 @@
>   
>   #include <linux/clk.h>
>   #include <linux/crc8.h>
> +#include <linux/debugfs.h>
>   #include <linux/delay.h>
>   #include <linux/gpio/consumer.h>
>   #include <linux/interconnect.h>
> @@ -62,6 +63,13 @@
>   #define AXI_MSTR_RESP_COMP_CTRL1		0x81c
>   #define MISC_CONTROL_1_REG			0x8bc
>   
> +/* MHI registers */
> +#define PARF_DEBUG_CNT_PM_LINKST_IN_L2		0xc04
> +#define PARF_DEBUG_CNT_PM_LINKST_IN_L1		0xc0c
> +#define PARF_DEBUG_CNT_PM_LINKST_IN_L0S		0xc10
> +#define PARF_DEBUG_CNT_AUX_CLK_IN_L1SUB_L1	0xc84
> +#define PARF_DEBUG_CNT_AUX_CLK_IN_L1SUB_L2	0xc88
> +
>   /* PARF_SYS_CTRL register fields */
>   #define MAC_PHY_POWERDOWN_IN_P2_D_MUX_EN	BIT(29)
>   #define MST_WAKEUP_EN				BIT(13)
> @@ -229,11 +237,13 @@ struct qcom_pcie {
>   	struct dw_pcie *pci;
>   	void __iomem *parf;			/* DT parf */
>   	void __iomem *elbi;			/* DT elbi */
> +	void __iomem *mhi;
>   	union qcom_pcie_resources res;
>   	struct phy *phy;
>   	struct gpio_desc *reset;
>   	struct icc_path *icc_mem;
>   	const struct qcom_pcie_cfg *cfg;
> +	struct dentry *debugfs;
>   };
>   
>   #define to_qcom_pcie(x)		dev_get_drvdata((x)->dev)
> @@ -1385,6 +1395,37 @@ static void qcom_pcie_icc_update(struct qcom_pcie *pcie)
>   	}
>   }
>   
> +static int qcom_pcie_link_transition_count(struct seq_file *s, void *data)
> +{
> +	struct qcom_pcie *pcie = (struct qcom_pcie *)
> +				     dev_get_drvdata(s->private);
> +
> +	seq_printf(s, "L0s transition count: %u\n",
> +		   readl_relaxed(pcie->mhi + PARF_DEBUG_CNT_PM_LINKST_IN_L0S));
> +
> +	seq_printf(s, "L1 transition count: %u\n",
> +		   readl_relaxed(pcie->mhi + PARF_DEBUG_CNT_PM_LINKST_IN_L1));
> +
> +	seq_printf(s, "L1.1 transition count: %u\n",
> +		   readl_relaxed(pcie->mhi + PARF_DEBUG_CNT_AUX_CLK_IN_L1SUB_L1));
> +
> +	seq_printf(s, "L1.2 transition count: %u\n",
> +		   readl_relaxed(pcie->mhi + PARF_DEBUG_CNT_AUX_CLK_IN_L1SUB_L2));
> +
> +	seq_printf(s, "L2 transition count: %u\n",
> +		   readl_relaxed(pcie->mhi + PARF_DEBUG_CNT_PM_LINKST_IN_L2));
> +
> +	return 0;
> +}
> +
> +static void qcom_pcie_init_debugfs(struct qcom_pcie *pcie)
> +{
> +	struct dw_pcie *pci = pcie->pci;
> +
> +	debugfs_create_devm_seqfile(pci->dev, "link_transition_count", pcie->debugfs,
> +				    qcom_pcie_link_transition_count);
> +}
> +
>   static int qcom_pcie_probe(struct platform_device *pdev)
>   {
>   	struct device *dev = &pdev->dev;
> @@ -1392,6 +1433,7 @@ static int qcom_pcie_probe(struct platform_device *pdev)
>   	struct dw_pcie *pci;
>   	struct qcom_pcie *pcie;
>   	const struct qcom_pcie_cfg *pcie_cfg;
> +	char *name;
>   	int ret;
>   
>   	pcie_cfg = of_device_get_match_data(dev);
> @@ -1439,6 +1481,12 @@ static int qcom_pcie_probe(struct platform_device *pdev)
>   		goto err_pm_runtime_put;
>   	}
>   
> +	pcie->mhi = devm_platform_ioremap_resource_byname(pdev, "mhi");
> +	if (IS_ERR(pcie->mhi)) {
> +		ret = PTR_ERR(pcie->mhi);
> +		goto err_pm_runtime_put;
> +	}
> +

  Tested this series on ipq4019-ap.dk07.1-c1 board and the above hunk
  breaks enumeration because there is no 'mhi' region. All the debug bits
  used in the transition_count function is inside the PARF_STTS register
  at offset 0x24 inside the PARF region.

  Register: PCIE_0_PCIE20_PARF_PM_STTS | 0x80024
  Offset:    0x24    Reset State:    0x00040000

Bits    Field Name
31    LINK_REQ_RST_NOT
30    XMLH_LINK_UP
29    PM_DSTATE_0
0x0: D0
0x1: D3
28    PHYSTATUS
27:16    PM_DSTATE
15:12    PM_PME_EN
11    PHYCLK_REQ_N
10    L1SS_CLKREQN_OE
9    L1SS_CLKREQN_IN
8    PM_LINKST_IN_L1SUB
7    PM_LINKST_IN_L0S
6    PM_LINKST_L2_EXIT
5    PM_LINKST_IN_L2
4    PM_LINKST_IN_L1
3:0    PM_STATUS

Otherwise, with rest of the patches enumeration was fine.
Tested with a pcie ethernet adapter.

Regards,
  Sricharan

Re: [PATCH v2 17/17] PCI: qcom: Expose link transition counts via debugfs

[Manivannan Sadhasivam]

On Thu, Mar 09, 2023 at 05:21:38PM +0530, Sricharan Ramabadhran wrote:
> 
> 
> On 3/9/2023 2:21 PM, Manivannan Sadhasivam wrote:
> > Qualcomm PCIe controllers have debug registers in the MHI region that
> > count PCIe link transitions. Expose them over debugfs to userspace to
> > help debug the low power issues.
> > 
> > Note that even though the registers are prefixed as PARF_, they don't
> > live under the "parf" register region. The register naming is following
> > the Qualcomm's internal documentation as like other registers.
> > 
> > Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
> > ---
> >   drivers/pci/controller/dwc/pcie-qcom.c | 59 ++++++++++++++++++++++++++
> >   1 file changed, 59 insertions(+)
> > 
> > diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
> > index e1180c84f0fa..6d9bde64c9e9 100644
> > --- a/drivers/pci/controller/dwc/pcie-qcom.c
> > +++ b/drivers/pci/controller/dwc/pcie-qcom.c
> > @@ -10,6 +10,7 @@
> >   #include <linux/clk.h>
> >   #include <linux/crc8.h>
> > +#include <linux/debugfs.h>
> >   #include <linux/delay.h>
> >   #include <linux/gpio/consumer.h>
> >   #include <linux/interconnect.h>
> > @@ -62,6 +63,13 @@
> >   #define AXI_MSTR_RESP_COMP_CTRL1		0x81c
> >   #define MISC_CONTROL_1_REG			0x8bc
> > +/* MHI registers */
> > +#define PARF_DEBUG_CNT_PM_LINKST_IN_L2		0xc04
> > +#define PARF_DEBUG_CNT_PM_LINKST_IN_L1		0xc0c
> > +#define PARF_DEBUG_CNT_PM_LINKST_IN_L0S		0xc10
> > +#define PARF_DEBUG_CNT_AUX_CLK_IN_L1SUB_L1	0xc84
> > +#define PARF_DEBUG_CNT_AUX_CLK_IN_L1SUB_L2	0xc88
> > +
> >   /* PARF_SYS_CTRL register fields */
> >   #define MAC_PHY_POWERDOWN_IN_P2_D_MUX_EN	BIT(29)
> >   #define MST_WAKEUP_EN				BIT(13)
> > @@ -229,11 +237,13 @@ struct qcom_pcie {
> >   	struct dw_pcie *pci;
> >   	void __iomem *parf;			/* DT parf */
> >   	void __iomem *elbi;			/* DT elbi */
> > +	void __iomem *mhi;
> >   	union qcom_pcie_resources res;
> >   	struct phy *phy;
> >   	struct gpio_desc *reset;
> >   	struct icc_path *icc_mem;
> >   	const struct qcom_pcie_cfg *cfg;
> > +	struct dentry *debugfs;
> >   };
> >   #define to_qcom_pcie(x)		dev_get_drvdata((x)->dev)
> > @@ -1385,6 +1395,37 @@ static void qcom_pcie_icc_update(struct qcom_pcie *pcie)
> >   	}
> >   }
> > +static int qcom_pcie_link_transition_count(struct seq_file *s, void *data)
> > +{
> > +	struct qcom_pcie *pcie = (struct qcom_pcie *)
> > +				     dev_get_drvdata(s->private);
> > +
> > +	seq_printf(s, "L0s transition count: %u\n",
> > +		   readl_relaxed(pcie->mhi + PARF_DEBUG_CNT_PM_LINKST_IN_L0S));
> > +
> > +	seq_printf(s, "L1 transition count: %u\n",
> > +		   readl_relaxed(pcie->mhi + PARF_DEBUG_CNT_PM_LINKST_IN_L1));
> > +
> > +	seq_printf(s, "L1.1 transition count: %u\n",
> > +		   readl_relaxed(pcie->mhi + PARF_DEBUG_CNT_AUX_CLK_IN_L1SUB_L1));
> > +
> > +	seq_printf(s, "L1.2 transition count: %u\n",
> > +		   readl_relaxed(pcie->mhi + PARF_DEBUG_CNT_AUX_CLK_IN_L1SUB_L2));
> > +
> > +	seq_printf(s, "L2 transition count: %u\n",
> > +		   readl_relaxed(pcie->mhi + PARF_DEBUG_CNT_PM_LINKST_IN_L2));
> > +
> > +	return 0;
> > +}
> > +
> > +static void qcom_pcie_init_debugfs(struct qcom_pcie *pcie)
> > +{
> > +	struct dw_pcie *pci = pcie->pci;
> > +
> > +	debugfs_create_devm_seqfile(pci->dev, "link_transition_count", pcie->debugfs,
> > +				    qcom_pcie_link_transition_count);
> > +}
> > +
> >   static int qcom_pcie_probe(struct platform_device *pdev)
> >   {
> >   	struct device *dev = &pdev->dev;
> > @@ -1392,6 +1433,7 @@ static int qcom_pcie_probe(struct platform_device *pdev)
> >   	struct dw_pcie *pci;
> >   	struct qcom_pcie *pcie;
> >   	const struct qcom_pcie_cfg *pcie_cfg;
> > +	char *name;
> >   	int ret;
> >   	pcie_cfg = of_device_get_match_data(dev);
> > @@ -1439,6 +1481,12 @@ static int qcom_pcie_probe(struct platform_device *pdev)
> >   		goto err_pm_runtime_put;
> >   	}
> > +	pcie->mhi = devm_platform_ioremap_resource_byname(pdev, "mhi");
> > +	if (IS_ERR(pcie->mhi)) {
> > +		ret = PTR_ERR(pcie->mhi);
> > +		goto err_pm_runtime_put;
> > +	}
> > +
> 
>  Tested this series on ipq4019-ap.dk07.1-c1 board and the above hunk
>  breaks enumeration because there is no 'mhi' region. All the debug bits
>  used in the transition_count function is inside the PARF_STTS register
>  at offset 0x24 inside the PARF region.
> 

Ah, "mhi" is supposed to be optional, my bad. Will fix it in next revision.

>  Register: PCIE_0_PCIE20_PARF_PM_STTS | 0x80024
>  Offset:    0x24    Reset State:    0x00040000
> 

Hmm, is this register present on other IPQ/APQ SoCs?

> Bits    Field Name
> 31    LINK_REQ_RST_NOT
> 30    XMLH_LINK_UP
> 29    PM_DSTATE_0
> 0x0: D0
> 0x1: D3
> 28    PHYSTATUS
> 27:16    PM_DSTATE
> 15:12    PM_PME_EN
> 11    PHYCLK_REQ_N
> 10    L1SS_CLKREQN_OE
> 9    L1SS_CLKREQN_IN
> 8    PM_LINKST_IN_L1SUB
> 7    PM_LINKST_IN_L0S
> 6    PM_LINKST_L2_EXIT
> 5    PM_LINKST_IN_L2
> 4    PM_LINKST_IN_L1
> 3:0    PM_STATUS
> 
> Otherwise, with rest of the patches enumeration was fine.
> Tested with a pcie ethernet adapter.
> 

Thanks a lot for testing!

- Mani

> Regards,
>  Sricharan

-- 
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