Merge branch 'pci/controller/mediatek-gen3'

- Add optional sys clock ready time setting to avoid sys_clk_rdy signal
  glitching in MT6991 and MT8196 (AngeloGioacchino Del Regno)

- Add DT binding and driver support for MT6991 and MT8196 (AngeloGioacchino
  Del Regno)

* pci/controller/mediatek-gen3:
  PCI: mediatek-gen3: Add support for MediaTek MT8196 SoC
  dt-bindings: PCI: mediatek-gen3: Add support for MT6991/MT8196
  PCI: mediatek-gen3: Implement sys clock ready time setting

1 files changed, 23 insertions, 0 deletions

diff --git a/drivers/pci/controller/pcie-mediatek-gen3.c b/drivers/pci/controller/pcie-mediatek-gen3.c
index 97147f43e41c..75ddb8bee168 100644
--- a/drivers/pci/controller/pcie-mediatek-gen3.c
+++ b/drivers/pci/controller/pcie-mediatek-gen3.c
@@ -102,6 +102,9 @@
 #define PCIE_MSI_SET_ADDR_HI_BASE	0xc80
 #define PCIE_MSI_SET_ADDR_HI_OFFSET	0x04
 
+#define PCIE_RESOURCE_CTRL_REG		0xd2c
+#define PCIE_RSRC_SYS_CLK_RDY_TIME_MASK	GENMASK(7, 0)
+
 #define PCIE_ICMD_PM_REG		0x198
 #define PCIE_TURN_OFF_LINK		BIT(4)
 
@@ -149,6 +152,7 @@ enum mtk_gen3_pcie_flags {
  * struct mtk_gen3_pcie_pdata - differentiate between host generations
  * @power_up: pcie power_up callback
  * @phy_resets: phy reset lines SoC data.
+ * @sys_clk_rdy_time_us: System clock ready time override (microseconds)
  * @flags: pcie device flags.
  */
 struct mtk_gen3_pcie_pdata {
@@ -157,6 +161,7 @@ struct mtk_gen3_pcie_pdata {
 		const char *id[MAX_NUM_PHY_RESETS];
 		int num_resets;
 	} phy_resets;
+	u8 sys_clk_rdy_time_us;
 	u32 flags;
 };
 
@@ -435,6 +440,14 @@ static int mtk_pcie_startup_port(struct mtk_gen3_pcie *pcie)
 		writel_relaxed(val, pcie->base + PCIE_CONF_LINK2_CTL_STS);
 	}
 
+	/* If parameter is present, adjust SYS_CLK_RDY_TIME to avoid glitching */
+	if (pcie->soc->sys_clk_rdy_time_us) {
+		val = readl_relaxed(pcie->base + PCIE_RESOURCE_CTRL_REG);
+		FIELD_MODIFY(PCIE_RSRC_SYS_CLK_RDY_TIME_MASK, &val,
+			     pcie->soc->sys_clk_rdy_time_us);
+		writel_relaxed(val, pcie->base + PCIE_RESOURCE_CTRL_REG);
+	}
+
 	/* Set class code */
 	val = readl_relaxed(pcie->base + PCIE_PCI_IDS_1);
 	val &= ~GENMASK(31, 8);
@@ -1327,6 +1340,15 @@ static const struct mtk_gen3_pcie_pdata mtk_pcie_soc_mt8192 = {
 	},
 };
 
+static const struct mtk_gen3_pcie_pdata mtk_pcie_soc_mt8196 = {
+	.power_up = mtk_pcie_power_up,
+	.phy_resets = {
+		.id[0] = "phy",
+		.num_resets = 1,
+	},
+	.sys_clk_rdy_time_us = 10,
+};
+
 static const struct mtk_gen3_pcie_pdata mtk_pcie_soc_en7581 = {
 	.power_up = mtk_pcie_en7581_power_up,
 	.phy_resets = {
@@ -1341,6 +1363,7 @@ static const struct mtk_gen3_pcie_pdata mtk_pcie_soc_en7581 = {
 static const struct of_device_id mtk_pcie_of_match[] = {
 	{ .compatible = "airoha,en7581-pcie", .data = &mtk_pcie_soc_en7581 },
 	{ .compatible = "mediatek,mt8192-pcie", .data = &mtk_pcie_soc_mt8192 },
+	{ .compatible = "mediatek,mt8196-pcie", .data = &mtk_pcie_soc_mt8196 },
 	{},
 };
 MODULE_DEVICE_TABLE(of, mtk_pcie_of_match);