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X-OriginatorOrg: solid-run.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 30 Oct 2025 15:16:47.2058 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: e8564122-02d8-43f3-68ed-08de17c757d6 X-MS-Exchange-CrossTenant-Id: a4a8aaf3-fd27-4e27-add2-604707ce5b82 X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=a4a8aaf3-fd27-4e27-add2-604707ce5b82;Ip=[52.17.62.50];Helo=[eu-dlp.cloud-sec-av.com] X-MS-Exchange-CrossTenant-AuthSource: AM4PEPF00027A62.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PAXPR04MB8271 This reverts commit 794a066688038df46c01e177cc6faebded0acba4 because it misunderstood interworking between arm trusted firmware and the common phy driver, and does not consistently resolve the issue it was intended to address. Further diagnostics have revealed the root cause for the reported system lock-up in a race condition between pci driver probe and clock core disabling unused clocks. Revert the wrong change restoring driver control over all pci lanes. As a temporary workaround for the original issue, users can boot with "clk_ignore_unused". Signed-off-by: Josua Mayer --- arch/arm64/boot/dts/marvell/cn9132-clearfog.dts | 16 ++-------------- 1 file changed, 2 insertions(+), 14 deletions(-) diff --git a/arch/arm64/boot/dts/marvell/cn9132-clearfog.dts b/arch/arm64/b= oot/dts/marvell/cn9132-clearfog.dts index 5cf83d8ca1f59..2507896d58f9b 100644 --- a/arch/arm64/boot/dts/marvell/cn9132-clearfog.dts +++ b/arch/arm64/boot/dts/marvell/cn9132-clearfog.dts @@ -413,13 +413,7 @@ fixed-link { /* SRDS #0,#1,#2,#3 - PCIe */ &cp0_pcie0 { num-lanes =3D <4>; - /* - * The mvebu-comphy driver does not currently know how to pass correct - * lane-count to ATF while configuring the serdes lanes. - * Rely on bootloader configuration only. - * - * phys =3D <&cp0_comphy0 0>, <&cp0_comphy1 0>, <&cp0_comphy2 0>, <&cp0_c= omphy3 0>; - */ + phys =3D <&cp0_comphy0 0>, <&cp0_comphy1 0>, <&cp0_comphy2 0>, <&cp0_comp= hy3 0>; status =3D "okay"; }; =20 @@ -481,13 +475,7 @@ &cp1_eth0 { /* SRDS #0,#1 - PCIe */ &cp1_pcie0 { num-lanes =3D <2>; - /* - * The mvebu-comphy driver does not currently know how to pass correct - * lane-count to ATF while configuring the serdes lanes. - * Rely on bootloader configuration only. - * - * phys =3D <&cp1_comphy0 0>, <&cp1_comphy1 0>; 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X-OriginatorOrg: solid-run.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 30 Oct 2025 15:16:54.6578 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 13487754-d122-42e9-959e-08de17c75c4a X-MS-Exchange-CrossTenant-Id: a4a8aaf3-fd27-4e27-add2-604707ce5b82 X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=a4a8aaf3-fd27-4e27-add2-604707ce5b82;Ip=[52.17.62.50];Helo=[eu-dlp.cloud-sec-av.com] X-MS-Exchange-CrossTenant-AuthSource: AM3PEPF0000A79A.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DU4PR04MB10936 CP110 based platforms rely on the bootloader for pci port initialization. TF-A actively prevents non-uboot re-configuration of pci lanes, and many boards do not have software control over the pci card reset. If a pci port had link at boot-time and the clock is stopped at a later point, the link fails and can not be recovered. PCI controller driver probe - and by extension ownership of a driver for the pci clocks - may be delayed especially on large modular kernels, causing the clock core to start disabling unused clocks. Add the CLK_IGNORE_UNUSED flag to the three pci port's clocks to ensure they are not stopped before the pci controller driver has taken ownership and tested for an existing link. This fixes failed pci link detection when controller driver probes late, e.g. with arm64 defconfig and CONFIG_PHY_MVEBU_CP110_COMPHY=3Dm. Closes: https://lore.kernel.org/r/b71596c7-461b-44b6-89ab-3cfbd492639f@soli= d-run.com Signed-off-by: Josua Mayer Acked-by: Gregory CLEMENT Reviewed-by: Andrew Lunn --- drivers/clk/mvebu/cp110-system-controller.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/drivers/clk/mvebu/cp110-system-controller.c b/drivers/clk/mveb= u/cp110-system-controller.c index 03c59bf221060..b47c869060466 100644 --- a/drivers/clk/mvebu/cp110-system-controller.c +++ b/drivers/clk/mvebu/cp110-system-controller.c @@ -110,6 +110,25 @@ static const char * const gate_base_names[] =3D { [CP110_GATE_EIP197] =3D "eip197" }; =20 +static unsigned long gate_flags(const u8 bit_idx) +{ + switch (bit_idx) { + case CP110_GATE_PCIE_X1_0: + case CP110_GATE_PCIE_X1_1: + case CP110_GATE_PCIE_X4: + /* + * If a port had an active link at boot time, stopping + * the clock creates a failed state from which controller + * driver can not recover. + * Prevent stopping this clock till after a driver has taken + * ownership. + */ + return CLK_IGNORE_UNUSED; + default: + return 0; + } +}; + struct cp110_gate_clk { struct clk_hw hw; struct regmap *regmap; @@ -171,6 +190,7 @@ static struct clk_hw *cp110_register_gate(const char *n= ame, init.ops =3D &cp110_gate_ops; init.parent_names =3D &parent_name; init.num_parents =3D 1; + init.flags =3D gate_flags(bit_idx); =20 gate->regmap =3D regmap; gate->bit_idx =3D bit_idx; --=20 2.51.0