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X-IronPort-AV: E=Sophos;i="5.93,265,1654552800"; d="scan'208";a="25828588" Subject: Re: [PATCH RESEND v2 1/2] clk: core: Honor CLK_OPS_PARENT_ENABLE for clk gate ops Received: from vtuxmail01.tq-net.de ([10.115.0.20]) by mx1.tq-group.com with ESMTP; 26 Aug 2022 14:28:04 +0200 Received: from steina-w.localnet (unknown [10.123.49.11]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) (No client certificate requested) by vtuxmail01.tq-net.de (Postfix) with ESMTPSA id 9A582280056; Fri, 26 Aug 2022 14:28:04 +0200 (CEST) From: Alexander Stein To: Michael Turquette , Stephen Boyd , Chen-Yu Tsai Cc: Chen-Yu Tsai , AngeloGioacchino Del Regno , =?ISO-8859-1?Q?N=EDcolas_F_=2E_R_=2E_A_=2E?= Prado , linux-clk@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Date: Fri, 26 Aug 2022 14:28:04 +0200 Message-ID: <12115951.O9o76ZdvQC@steina-w> Organization: TQ-Systems GmbH In-Reply-To: <20220822081424.1310926-2-wenst@chromium.org> References: <20220822081424.1310926-1-wenst@chromium.org> <20220822081424.1310926-2-wenst@chromium.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220826_052810_589682_92D14ABB X-CRM114-Status: GOOD ( 23.60 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi everybody, Am Montag, 22. August 2022, 10:14:23 CEST schrieb Chen-Yu Tsai: > In the previous commits that added CLK_OPS_PARENT_ENABLE, support for > this flag was only added to rate change operations (rate setting and > reparent) and disabling unused subtree. It was not added to the > clock gate related operations. Any hardware driver that needs it for > these operations will either see bogus results, or worse, hang. > = > This has been seen on MT8192 and MT8195, where the imp_ii2_* clk > drivers set this, but dumping debugfs clk_summary would cause it > to hang. > = > Fixes: fc8726a2c021 ("clk: core: support clocks which requires parents > enable (part 2)") Fixes: a4b3518d146f ("clk: core: support clocks which > requires parents enable (part 1)") Signed-off-by: Chen-Yu Tsai > > Reviewed-by: N=EDcolas F. R. A. Prado > Tested-by: N=EDcolas F. R. A. Prado > --- > drivers/clk/clk.c | 28 ++++++++++++++++++++++++++++ > 1 file changed, 28 insertions(+) > = > diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c > index 7fc191c15507..9b365cd6d14b 100644 > --- a/drivers/clk/clk.c > +++ b/drivers/clk/clk.c > @@ -196,6 +196,9 @@ static bool clk_core_rate_is_protected(struct clk_core > *core) return core->protect_count; > } > = > +static int clk_core_prepare_enable(struct clk_core *core); > +static void clk_core_disable_unprepare(struct clk_core *core); > + > static bool clk_core_is_prepared(struct clk_core *core) > { > bool ret =3D false; > @@ -208,7 +211,11 @@ static bool clk_core_is_prepared(struct clk_core *co= re) > return core->prepare_count; > = > if (!clk_pm_runtime_get(core)) { > + if (core->flags & CLK_OPS_PARENT_ENABLE) > + clk_core_prepare_enable(core->parent); > ret =3D core->ops->is_prepared(core->hw); > + if (core->flags & CLK_OPS_PARENT_ENABLE) > + clk_core_disable_unprepare(core->parent); > clk_pm_runtime_put(core); > } > = > @@ -244,7 +251,13 @@ static bool clk_core_is_enabled(struct clk_core *cor= e) > } > } > = > + if (core->flags & CLK_OPS_PARENT_ENABLE) > + clk_core_prepare_enable(core->parent); > + > ret =3D core->ops->is_enabled(core->hw); > + > + if (core->flags & CLK_OPS_PARENT_ENABLE) > + clk_core_disable_unprepare(core->parent); > done: > if (core->rpm_enabled) > pm_runtime_put(core->dev); > @@ -812,6 +825,9 @@ int clk_rate_exclusive_get(struct clk *clk) > } > EXPORT_SYMBOL_GPL(clk_rate_exclusive_get); > = > +static int clk_core_enable_lock(struct clk_core *core); > +static void clk_core_disable_lock(struct clk_core *core); > + > static void clk_core_unprepare(struct clk_core *core) > { > lockdep_assert_held(&prepare_lock); > @@ -835,6 +851,9 @@ static void clk_core_unprepare(struct clk_core *core) > = > WARN(core->enable_count > 0, "Unpreparing enabled %s\n", core- >name); > = > + if (core->flags & CLK_OPS_PARENT_ENABLE) > + clk_core_enable_lock(core->parent); > + > trace_clk_unprepare(core); > = > if (core->ops->unprepare) > @@ -843,6 +862,9 @@ static void clk_core_unprepare(struct clk_core *core) > clk_pm_runtime_put(core); > = > trace_clk_unprepare_complete(core); > + > + if (core->flags & CLK_OPS_PARENT_ENABLE) > + clk_core_disable_lock(core->parent); > clk_core_unprepare(core->parent); > } > = > @@ -891,6 +913,9 @@ static int clk_core_prepare(struct clk_core *core) > if (ret) > goto runtime_put; > = > + if (core->flags & CLK_OPS_PARENT_ENABLE) > + clk_core_enable_lock(core->parent); > + > trace_clk_prepare(core); > = > if (core->ops->prepare) > @@ -898,6 +923,9 @@ static int clk_core_prepare(struct clk_core *core) > = > trace_clk_prepare_complete(core); > = > + if (core->flags & CLK_OPS_PARENT_ENABLE) > + clk_core_disable_lock(core->parent); > + > if (ret) > goto unprepare; > } Unfortunately this completely locks up my i.MX8M Plus based board during ea= rly = boot. I'm currently running on next-20220826 using arch/arm64/boot/dts/freescale/ imx8mp-tqma8mpql-mba8mpxl.dts Reverting this patch gets my board booting again. dmesg until hard lockup = below. Best regards, Alexander [ 0.000000] Booting Linux on physical CPU 0x0000000000 [0x410fd034] = = [ 0.000000] Linux version 6.0.0-rc2-next-20220826 (steina@steina-w) = (aarch64-v8a-linux-gnu-gcc (OSELAS.Toolchain-2020.08.0 10-2020 0822) 10.2.1 20200822, GNU ld (GNU Binutils) 2.35) #603 SMP PREEMPT Fri Aug= 26 = 14:25:05 CEST 2022 = [ 0.000000] Machine model: TQ-Systems i.MX8MPlus TQMa8MPxL on MBa8MPxL = = [ 0.000000] earlycon: ec_imx6q0 at MMIO 0x0000000030a60000 (options = '115200') = [ 0.000000] printk: bootconsole [ec_imx6q0] enabled = = [ 0.000000] efi: UEFI not found. = = [ 0.000000] Reserved memory: created CMA memory pool at 0x000000005a4000= 00, = size 896 MiB = [ 0.000000] OF: reserved mem: initialized node linux,cma, compatible id = shared-dma-pool = [ 0.000000] NUMA: No NUMA configuration found = = [ 0.000000] NUMA: Faking a node at [mem = 0x0000000040000000-0x00000000bfffffff] = = [ 0.000000] NUMA: NODE_DATA [mem 0xbfbd6b00-0xbfbd8fff] = = [ 0.000000] Zone ranges: = = [ 0.000000] DMA [mem 0x0000000040000000-0x00000000bfffffff] = = [ 0.000000] DMA32 empty = = [ 0.000000] Normal empty = = [ 0.000000] Movable zone start for each node = = [ 0.000000] Early memory node ranges = = [ 0.000000] node 0: [mem 0x0000000040000000-0x00000000923fffff] = = [ 0.000000] node 0: [mem 0x0000000092400000-0x00000000943fffff] = = [ 0.000000] node 0: [mem 0x0000000094400000-0x00000000bfffffff] = = [ 0.000000] Initmem setup node 0 [mem = 0x0000000040000000-0x00000000bfffffff] = = [ 0.000000] psci: probing for conduit method from DT. = = [ 0.000000] psci: PSCIv1.1 detected in firmware. = = [ 0.000000] psci: Using standard PSCI v0.2 function IDs = = [ 0.000000] psci: MIGRATE_INFO_TYPE not supported. = = [ 0.000000] psci: SMC Calling Convention v1.1 = = [ 0.000000] percpu: Embedded 19 pages/cpu s38376 r8192 d31256 u77824 = = [ 0.000000] Detected VIPT I-cache on CPU0 = = [ 0.000000] CPU features: detected: GIC system register CPU interface = = [ 0.000000] CPU features: detected: ARM erratum 845719 = = [ 0.000000] Fallback order for Node 0: 0 = = [ 0.000000] Built 1 zonelists, mobility grouping on. Total pages: 51609= 6 = [ 0.000000] Policy zone: DMA = = [ 0.000000] Kernel command line: root=3D/dev/nfs rw nfsroot=3D192.168.0.= 101:/ srv/tftp/imx8_mainline,v3,tcp ip=3D192.168.0.100:192.168.0. 101::::eth0:off console=3Dttymxc3,115200 earlycon=3Dec_imx6q,0x30A60000,115= 200 = [ 0.000000] Dentry cache hash table entries: 262144 (order: 9, 2097152 = bytes, linear) = [ 0.000000] Inode-cache hash table entries: 131072 (order: 8, 1048576 = bytes, linear) = [ 0.000000] mem auto-init: stack:off, heap alloc:off, heap free:off = = [ 0.000000] Memory: 1077444K/2097152K available (14144K kernel code, 220= 6K = rwdata, 6596K rodata, 5376K init, 519K bss, 102204K res erved, 917504K cma-reserved) = = [ 0.000000] SLUB: HWalign=3D64, Order=3D0-3, MinObjects=3D0, CPUs=3D4, N= odes=3D1 = [ 0.000000] rcu: Preemptible hierarchical RCU implementation. = = [ 0.000000] rcu: RCU event tracing is enabled. = = [ 0.000000] rcu: RCU restricting CPUs from NR_CPUS=3D256 to nr_cpu_i= ds=3D4. = [ 0.000000] Trampoline variant of Tasks RCU enabled. = = [ 0.000000] Tracing variant of Tasks RCU enabled. = = [ 0.000000] rcu: RCU calculated value of scheduler-enlistment delay is 2= 5 = jiffies. = [ 0.000000] rcu: Adjusting geometry for rcu_fanout_leaf=3D16, nr_cpu_ids= =3D4 = [ 0.000000] NR_IRQS: 64, nr_irqs: 64, preallocated irqs: 0 = = [ 0.000000] GICv3: GIC: Using split EOI/Deactivate mode = = [ 0.000000] GICv3: 160 SPIs implemented = = [ 0.000000] GICv3: 0 Extended SPIs implemented = = [ 0.000000] Root IRQ handler: gic_handle_irq = = [ 0.000000] GICv3: GICv3 features: 16 PPIs = = [ 0.000000] GICv3: CPU0: found redistributor 0 region 0:0x00000000388800= 00 = [ 0.000000] ITS: No ITS available, not enabling LPIs = = [ 0.000000] rcu: srcu_init: Setting srcu_struct sizes based on contentio= n. = [ 0.000000] arch_timer: cp15 timer(s) running at 8.00MHz (phys). = = [ 0.000000] clocksource: arch_sys_counter: mask: 0xffffffffffffff = max_cycles: 0x1d854df40, max_idle_ns: 440795202120 ns = [ 0.000000] sched_clock: 56 bits at 8MHz, resolution 125ns, wraps every = 2199023255500ns = [ 0.008368] Console: colour dummy device 80x25 = = [ 0.012575] Calibrating delay loop (skipped), value calculated using tim= er = frequency.. 16.00 BogoMIPS (lpj=3D32000) = [ 0.022844] pid_max: default: 32768 minimum: 301 = = [ 0.027538] LSM: Security Framework initializing = = [ 0.032209] Mount-cache hash table entries: 4096 (order: 3, 32768 bytes, = linear) = [ 0.039560] Mountpoint-cache hash table entries: 4096 (order: 3, 32768 = bytes, linear) = [ 0.048701] cblist_init_generic: Setting adjustable number of callback = queues. = [ 0.054720] cblist_init_generic: Setting shift to 2 and lim to 1. = = [ 0.060880] cblist_init_generic: Setting shift to 2 and lim to 1. = = [ 0.067086] rcu: Hierarchical SRCU implementation. = = [ 0.071761] rcu: Max phase no-delay instances is 1000. = = [ 0.078123] EFI services will not be available. = = [ 0.081907] smp: Bringing up secondary CPUs ... = = [ 0.086553] Detected VIPT I-cache on CPU1 = = [ 0.086639] GICv3: CPU1: found redistributor 1 region 0:0x00000000388a00= 00 = [ 0.086675] CPU1: Booted secondary processor 0x0000000001 [0x410fd034] = = [ 0.087141] Detected VIPT I-cache on CPU2 = = [ 0.087209] GICv3: CPU2: found redistributor 2 region 0:0x00000000388c00= 00 = [ 0.087229] CPU2: Booted secondary processor 0x0000000002 [0x410fd034] = = [ 0.087664] Detected VIPT I-cache on CPU3 = = [ 0.087735] GICv3: CPU3: found redistributor 3 region 0:0x00000000388e00= 00 = [ 0.087754] CPU3: Booted secondary processor 0x0000000003 [0x410fd034] = = [ 0.087819] smp: Brought up 1 node, 4 CPUs = = [ 0.142729] SMP: Total of 4 processors activated. = = [ 0.147444] CPU features: detected: 32-bit EL0 Support = = [ 0.152623] CPU features: detected: CRC32 instructions = = [ 0.157983] CPU: All CPU(s) started at EL2 = = [ 0.161908] alternatives: patching kernel code = = [ 0.167362] devtmpfs: initialized = = [ 0.175779] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xfffffff= f, = max_idle_ns: 7645041785100000 ns = [ 0.182756] futex hash table entries: 1024 (order: 4, 65536 bytes, linea= r) = [ 0.213470] pinctrl core: initialized pinctrl subsystem = = [ 0.217757] DMI not present or invalid. = = [ 0.220335] NET: Registered PF_NETLINK/PF_ROUTE protocol family = = [ 0.226544] DMA: preallocated 256 KiB GFP_KERNEL pool for atomic = allocations = [ 0.232875] DMA: preallocated 256 KiB GFP_KERNEL|GFP_DMA pool for atomic = allocations = [ 0.240685] DMA: preallocated 256 KiB GFP_KERNEL|GFP_DMA32 pool for atom= ic = allocations = [ 0.248550] audit: initializing netlink subsys (disabled) [ 0.254096] audit: type=3D2000 audit(0.180:1): state=3Dinitialized = audit_enabled=3D0 res=3D1 [ 0.254516] thermal_sys: Registered thermal governor 'bang_bang' [ 0.261730] thermal_sys: Registered thermal governor 'step_wise' [ 0.267761] thermal_sys: Registered thermal governor 'power_allocator' [ 0.273829] cpuidle: using governor menu [ 0.284458] hw-breakpoint: found 6 breakpoint and 4 watchpoint registers. [ 0.291197] ASID allocator initialised with 65536 entries [ 0.297274] Serial: AMBA PL011 UART driver [ 0.307172] imx8mp-pinctrl 30330000.pinctrl: initialized IMX pinctrl dri= ver [ 0.323077] KASLR disabled due to lack of seed [ 0.333413] HugeTLB: registered 1.00 GiB page size, pre-allocated 0 pages [ 0.337396] HugeTLB: 16380 KiB vmemmap can be freed for a 1.00 GiB page [ 0.344066] HugeTLB: registered 32.0 MiB page size, pre-allocated 0 pages [ 0.350860] HugeTLB: 508 KiB vmemmap can be freed for a 32.0 MiB page [ 0.357335] HugeTLB: registered 2.00 MiB page size, pre-allocated 0 pages [ 0.364157] HugeTLB: 28 KiB vmemmap can be freed for a 2.00 MiB page [ 0.370546] HugeTLB: registered 64.0 KiB page size, pre-allocated 0 pages [ 0.377372] HugeTLB: 0 KiB vmemmap can be freed for a 64.0 KiB page [ 0.384224] cryptd: max_cpu_qlen set to 1000 [ 0.390062] iommu: Default domain type: Translated = [ 0.392886] iommu: DMA domain TLB invalidation policy: strict mode = [ 0.399407] SCSI subsystem initialized [ 0.403223] usbcore: registered new interface driver usbfs [ 0.408468] usbcore: registered new interface driver hub [ 0.413793] usbcore: registered new device driver usb [ 0.419379] mc: Linux media interface: v0.10 [ 0.423158] videodev: Linux video capture interface: v2.00 [ 0.428668] pps_core: LinuxPPS API ver. 1 registered [ 0.433635] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo = Giometti [ 0.442834] PTP clock support registered [ 0.446880] EDAC MC: Ver: 3.0.0 [ 0.450601] FPGA manager framework [ 0.453404] Advanced Linux Sound Architecture Driver Initialized. [ 0.460221] vgaarb: loaded [ 0.462422] clocksource: Switched to clocksource arch_sys_counter [ 0.468465] VFS: Disk quotas dquot_6.6.0 [ 0.472258] VFS: Dquot-cache hash table entries: 512 (order 0, 4096 byte= s) [ 0.485904] NET: Registered PF_INET protocol family [ 0.488099] IP idents hash table entries: 32768 (order: 6, 262144 bytes, = linear) [ 0.496889] tcp_listen_portaddr_hash hash table entries: 1024 (order: 2, = 16384 bytes, linear) [ 0.504019] Table-perturb hash table entries: 65536 (order: 6, 262144 = bytes, linear) [ 0.511764] TCP established hash table entries: 16384 (order: 5, 131072 = bytes, linear) [ 0.519819] TCP bind hash table entries: 16384 (order: 7, 524288 bytes, = linear) [ 0.527471] TCP: Hash tables configured (established 16384 bind 16384) [ 0.533730] UDP hash table entries: 1024 (order: 3, 32768 bytes, linear) [ 0.540415] UDP-Lite hash table entries: 1024 (order: 3, 32768 bytes, = linear) [ 0.547696] NET: Registered PF_UNIX/PF_LOCAL protocol family [ 0.553577] RPC: Registered named UNIX socket transport module. [ 0.559190] RPC: Registered udp transport module. [ 0.563903] RPC: Registered tcp transport module. [ 0.568627] RPC: Registered tcp NFSv4.1 backchannel transport module. [ 0.575107] PCI: CLS 0 bytes, default 64 [ 0.579612] hw perfevents: enabled with armv8_cortex_a53 PMU driver, 7 = counters available [ 0.588770] Initialise system trusted keyrings [ 0.591888] workingset: timestamp_bits=3D42 max_order=3D19 bucket_order= =3D0 [ 0.605043] squashfs: version 4.0 (2009/01/31) Phillip Lougher [ 0.608686] NFS: Registering the id_resolver key type [ 0.613155] Key type id_resolver registered [ 0.617328] Key type id_legacy registered [ 0.621432] nfs4filelayout_init: NFSv4 File Layout Driver Registering... [ 0.628089] nfs4flexfilelayout_init: NFSv4 Flexfile Layout Driver = Registering... [ 0.671152] Key type asymmetric registered [ 0.672397] Asymmetric key parser 'x509' registered [ 0.677336] Block layer SCSI generic (bsg) driver version 0.4 loaded (ma= jor = 243) [ 0.684742] io scheduler mq-deadline registered [ 0.689290] io scheduler kyber registered _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel