mediatek: mt7988: fix clk for 2nd PCIe port

Due to what seems to be an undocumented oddity in MediaTek's MT7988
SoC design the CLK_INFRA_PCIE_PERI_26M_CK_P2 clock requires
CLK_INFRA_PCIE_PERI_26M_CK_P3 to be enabled.

This currently leads to PCIe port 2 not working in Linux.

Reflect the apparent relationship in the clk driver to make sure PCIe
port 2 of the MT7988 SoC works.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

diff --git a/target/linux/mediatek/patches-6.1/252-clk-mediatek-mt7988-infracfg-fix-clocks-for-2nd-PCIe.patch b/target/linux/mediatek/patches-6.1/252-clk-mediatek-mt7988-infracfg-fix-clocks-for-2nd-PCIe.patch
new file mode 100644 (file)
index 0000000..c4760b9
--- /dev/null
+++ b/target/linux/mediatek/patches-6.1/252-clk-mediatek-mt7988-infracfg-fix-clocks-for-2nd-PCIe.patch
@@ -0,0 +1,31 @@
+From c202f510bbaa34ab5d65a69a61e0e72761374b17 Mon Sep 17 00:00:00 2001
+From: Daniel Golle <daniel@makrotopia.org>
+Date: Mon, 11 Mar 2024 17:14:19 +0000
+Subject: [PATCH] clk: mediatek: mt7988-infracfg: fix clocks for 2nd PCIe port
+
+Due to what seems to be an undocumented oddity in MediaTek's MT7988
+SoC design the CLK_INFRA_PCIE_PERI_26M_CK_P2 clock requires
+CLK_INFRA_PCIE_PERI_26M_CK_P3 to be enabled.
+
+This currently leads to PCIe port 2 not working in Linux.
+
+Reflect the apparent relationship in the clk driver to make sure PCIe
+port 2 of the MT7988 SoC works.
+
+Suggested-by: Sam Shih <sam.shih@mediatek.com>
+Signed-off-by: Daniel Golle <daniel@makrotopia.org>
+---
+ drivers/clk/mediatek/clk-mt7988-infracfg.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+--- a/drivers/clk/mediatek/clk-mt7988-infracfg.c
++++ b/drivers/clk/mediatek/clk-mt7988-infracfg.c
+@@ -156,7 +156,7 @@ static const struct mtk_gate infra_clks[
+       GATE_INFRA0(CLK_INFRA_PCIE_PERI_26M_CK_P1, "infra_pcie_peri_ck_26m_ck_p1",
+                   "csw_infra_f26m_sel", 8),
+       GATE_INFRA0(CLK_INFRA_PCIE_PERI_26M_CK_P2, "infra_pcie_peri_ck_26m_ck_p2",
+-                  "csw_infra_f26m_sel", 9),
++                  "infra_pcie_peri_ck_26m_ck_p3", 9),
+       GATE_INFRA0(CLK_INFRA_PCIE_PERI_26M_CK_P3, "infra_pcie_peri_ck_26m_ck_p3",
+                   "csw_infra_f26m_sel", 10),
+       /* INFRA1 */