WhyCan Forum(哇酷开发者社区)

# ts_test
[   26.815685] 
[   26.817350] ======================================================
[   26.823636] WARNING: possible circular locking dependency detected
[   26.829937] 4.14.85-01139-g4bae6b9d2d1e-dirty #48 Not tainted
[   26.835784] ------------------------------------------------------
[   26.842073] irq/51-tsc2007/54 is trying to acquire lock:
[   26.847487]  (prepare_lock){+.+.}, at: [<c0496650>] clk_prepare_lock+0x80/0xf4
[   26.854999] 
[   26.854999] but task is already holding lock:
[   26.860944]  (i2c_register_adapter){+.+.}, at: [<c06959b0>] i2c_adapter_lock_bus+0x20/0x24
[   26.869480] 
[   26.869480] which lock already depends on the new lock.
[   26.869480] 
[   26.877791] 
[   26.877791] the existing dependency chain (in reverse order) is:
[   26.885388] 
[   26.885388] -> #1 (i2c_register_adapter){+.+.}:
[   26.891686]        rt_mutex_lock_nested+0x48/0x60
[   26.896533]        i2c_adapter_lock_bus+0x20/0x24
[   26.901377]        i2c_transfer+0xa8/0xbc
[   26.905525]        pcf8563_read_block_data+0x60/0x94
[   26.910634]        pcf8563_clkout_recalc_rate+0x24/0x4c
[   26.916004]        clk_register+0x31c/0x644
[   26.920328]        devm_clk_register+0x40/0x78
[   26.924906]        pcf8563_probe+0x170/0x244
[   26.929315]        i2c_device_probe+0x258/0x278
[   26.933984]        driver_probe_device+0x214/0x2e8
[   26.938907]        __driver_attach+0xb4/0xb8
[   26.943307]        bus_for_each_dev+0x54/0xa4
[   26.947793]        driver_attach+0x20/0x28
[   26.952020]        bus_add_driver+0x178/0x20c
[   26.956509]        driver_register+0x80/0xfc
[   26.960917]        i2c_register_driver+0x40/0x84
[   26.965684]        pcf8563_driver_init+0x18/0x20
[   26.970436]        do_one_initcall+0x44/0x174
[   26.974938]        kernel_init_freeable+0x120/0x1e0
[   26.979955]        kernel_init+0x10/0x11c
[   26.984104]        ret_from_fork+0x14/0x20
[   26.988301] 
[   26.988301] -> #0 (prepare_lock){+.+.}:
[   26.993914]        lock_acquire+0x70/0x90
[   26.998072]        __mutex_lock+0x58/0x960
[   27.002312]        mutex_lock_nested+0x24/0x2c
[   27.006892]        clk_prepare_lock+0x80/0xf4
[   27.011386]        clk_core_get_rate+0x14/0x78
[   27.015964]        clk_get_rate+0x1c/0x20
[   27.020106]        i2c_imx_start+0x20/0x1c8
[   27.024419]        i2c_imx_xfer+0x44/0xb24
[   27.028659]        __i2c_transfer+0x138/0x27c
[   27.033154]        i2c_transfer+0x6c/0xbc
[   27.037306]        i2c_smbus_xfer+0x220/0x5cc
[   27.041806]        i2c_smbus_read_word_data+0x38/0x48
[   27.046997]        tsc2007_xfer+0x18/0x54
[   27.051144]        tsc2007_soft_irq+0x80/0x268
[   27.055728]        irq_thread_fn+0x24/0x80
[   27.059963]        irq_thread+0x140/0x1f4
[   27.064111]        kthread+0x14c/0x164
[   27.068000]        ret_from_fork+0x14/0x20
[   27.072196] 
[   27.072196] other info that might help us debug this:
[   27.072196] 
[   27.080335]  Possible unsafe locking scenario:
[   27.080335] 
[   27.086366]        CPU0                    CPU1
[   27.090992]        ----                    ----
[   27.095612]   lock(i2c_register_adapter);
[   27.099792]                                lock(prepare_lock);
[   27.105791]                                lock(i2c_register_adapter);
[   27.112481]   lock(prepare_lock);
[   27.115962] 
[   27.115962]  *** DEADLOCK ***
[   27.115962] 
[   27.122029] 2 locks held by irq/51-tsc2007/54:
[   27.126569]  #0:  (&ts->mlock){+.+.}, at: [<c068a378>] tsc2007_soft_irq+0x54/0x268
[   27.134426]  #1:  (i2c_register_adapter){+.+.}, at: [<c06959b0>] i2c_adapter_lock_bus+0x20/0x24
[   27.143417] 
[   27.143417] stack backtrace:
[   27.147931] CPU: 0 PID: 54 Comm: irq/51-tsc2007 Not tainted 4.14.85-01139-g4bae6b9d2d1e-dirty #48
[   27.156914] Hardware name: Freescale i.MX6 Ultralite (Device Tree)
[   27.163190] Backtrace: 
[   27.165834] [<c010c31c>] (dump_backtrace) from [<c010c5e8>] (show_stack+0x18/0x1c)
[   27.173554]  r7:00000000 r6:60070093 r5:00000000 r4:c0e6c190
[   27.179374] [<c010c5d0>] (show_stack) from [<c098a9cc>] (dump_stack+0xb4/0xec)
[   27.186774] [<c098a918>] (dump_stack) from [<c016e26c>] (print_circular_bug.constprop.19+0x1c4/0x2f8)
[   27.196164]  r10:c15cd9e0 r9:ffffffff r8:d8351900 r7:d8351e48 r6:c12bb1e8 r5:c12cfbc8
[   27.204117]  r4:c12bb1e8 r3:00000001
[   27.207869] [<c016e0a8>] (print_circular_bug.constprop.19) from [<c0171464>] (__lock_acquire+0x18e0/0x1914)
[   27.217779]  r10:d8351900 r9:c12bb1e8 r8:c157a410 r7:00000002 r6:69912d26 r5:d8351e28
[   27.225731]  r4:d8351e48 r3:d8351e28
[   27.229478] [<c016fb84>] (__lock_acquire) from [<c0171c3c>] (lock_acquire+0x70/0x90)
[   27.237387]  r10:00000002 r9:c15db728 r8:00000001 r7:00000001 r6:60070013 r5:00000000
[   27.245329]  r4:ffffe000
[   27.248039] [<c0171bcc>] (lock_acquire) from [<c09a1548>] (__mutex_lock+0x58/0x960)
[   27.255852]  r8:ffff9548 r7:c0e04900 r6:00000000 r5:00000000 r4:c0e28d18
[   27.262740] [<c09a14f0>] (__mutex_lock) from [<c09a1e74>] (mutex_lock_nested+0x24/0x2c)
[   27.270911]  r10:00000002 r9:c15db728 r8:ffff9548 r7:c0e04900 r6:c0e47bcc r5:00000001
[   27.278854]  r4:c15d0924
[   27.281565] [<c09a1e50>] (mutex_lock_nested) from [<c0496650>] (clk_prepare_lock+0x80/0xf4)
[   27.290095] [<c04965d0>] (clk_prepare_lock) from [<c0498084>] (clk_core_get_rate+0x14/0x78)
[   27.298571]  r5:00000001 r4:d8016f80
[   27.302321] [<c0498070>] (clk_core_get_rate) from [<c0498c04>] (clk_get_rate+0x1c/0x20)
[   27.310452]  r5:00000001 r4:d80d5810
[   27.314201] [<c0498be8>] (clk_get_rate) from [<c069b518>] (i2c_imx_start+0x20/0x1c8)
[   27.322109] [<c069b4f8>] (i2c_imx_start) from [<c069ba80>] (i2c_imx_xfer+0x44/0xb24)
[   27.330018]  r9:c15db728 r8:ffff9548 r7:c0e04900 r6:d859fdd8 r5:00000001 r4:d80d5810
[   27.337933] [<c069ba3c>] (i2c_imx_xfer) from [<c06963e0>] (__i2c_transfer+0x138/0x27c)
[   27.346017]  r10:00000002 r9:c15db728 r8:ffff9548 r7:c0e04900 r6:d859fdd8 r5:00000000
[   27.353959]  r4:d80d5810
[   27.356670] [<c06962a8>] (__i2c_transfer) from [<c0696590>] (i2c_transfer+0x6c/0xbc)
[   27.364577]  r10:00000019 r9:00000048 r8:00000001 r7:00000000 r6:00000002 r5:d859fdd8
[   27.372531]  r4:d80d5810 r3:d8351900
[   27.376288] [<c0696524>] (i2c_transfer) from [<c06979c4>] (i2c_smbus_xfer+0x220/0x5cc)
[   27.384353]  r7:00000000 r6:00000000 r5:d844c410 r4:d80d5810
[   27.390198] [<c06977a4>] (i2c_smbus_xfer) from [<c0697ec0>] (i2c_smbus_read_word_data+0x38/0x48)
[   27.399150]  r10:00000019 r9:d8322800 r8:d844c48c r7:00000001 r6:00000000 r5:d844c410
[   27.407093]  r4:d844c410
[   27.409808] [<c0697e88>] (i2c_smbus_read_word_data) from [<c0689e10>] (tsc2007_xfer+0x18/0x54)
[   27.418598] [<c0689df8>] (tsc2007_xfer) from [<c068a3a4>] (tsc2007_soft_irq+0x80/0x268)
[   27.426729]  r5:d8125800 r4:d844c410
[   27.430483] [<c068a324>] (tsc2007_soft_irq) from [<c017eeec>] (irq_thread_fn+0x24/0x80)
[   27.438653]  r10:00000001 r9:d856a980 r8:d8125800 r7:00000001 r6:00000000 r5:d8125800
[   27.446593]  r4:d856a980
[   27.449301] [<c017eec8>] (irq_thread_fn) from [<c017f208>] (irq_thread+0x140/0x1f4)
[   27.457104]  r7:00000001 r6:00000000 r5:ffffe000 r4:d856a9a4
[   27.462940] [<c017f0c8>] (irq_thread) from [<c01475e8>] (kthread+0x14c/0x164)
[   27.470244]  r10:d8055c2c r9:c017f0c8 r8:d856a980 r7:d859e000 r6:d856a9c0 r5:d856cf80
[   27.478182]  r4:00000000
[   27.480889] [<c014749c>] (kthread) from [<c0107eb4>] (ret_from_fork+0x14/0x20)
[   27.488275]  r10:00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:c014749c
[   27.496215]  r4:d856a9c0
下面这里触摸可以显示出坐标
30.142003:    515     11   3362
30.169044:    516     12   3420
30.187874:    514     12   3461
30.206580:    514     13   3480
触摸久了会出现
[   45.424447] tsc2007 1-0048: i2c io error: -6

# cat /proc/interrupts 
           CPU0       
 16:      37647       GPC  55 Level     i.MX Timer Tick
 17:      15772       GPC  13 Level     mxs-dma
 18:       5078       GPC  15 Level     bch
 19:        977       GPC  26 Level     2020000.serial
 31:          0       GPC  80 Level     20bc000.wdog
 37:          0       GPC  19 Level     rtc alarm
 39:          0       GPC   4 Level     20cc000.snvs:snvs-powerkey
 44:          0       GPC   2 Level     sdma
 45:          0       GPC  36 Level     21a0000.i2c
 46:     164887       GPC  37 Level     21a4000.i2c
 47:          0       GPC   5 Level     mxsfb-drm
 51:       6153  gpio-mxc   3 Level     tsc2007
IPI0:          0  CPU wakeup interrupts
IPI1:          0  Timer broadcast interrupts
IPI2:          0  Rescheduling interrupts
IPI3:          0  Function call interrupts
IPI4:          0  CPU stop interrupts
IPI5:       2973  IRQ work interrupts
IPI6:          0  completion interrupts
Err:          0

i2c2: i2c@021a4000 {
     #address-cells = <1>;
     #size-cells = <0>;
     compatible = "fsl,imx6ul-i2c", "fsl,imx21-i2c";
     reg = <0x021a4000 0x4000>;
     interrupts = <GIC_SPI 37 IRQ_TYPE_LEVEL_HIGH>;
     clocks = <&clks IMX6UL_CLK_I2C2>;
     status = "disabled";
};

&i2c2 {
	clock_frequency = <400000>;//ckk
	pinctrl-names = "default";
	pinctrl-0 = <&pinctrl_i2c2>;
	status = "okay";

	pcf8563@51 {
		compatible = "nxp,pcf8563";
		reg = <0x51>;
	};

	touchscreen: touchscreen@48 {
		compatible = "ti,tsc2007";
		reg = <0x48>;
		interrupt-parent = <&gpio1>;
		interrupts = <3 8>;
		ti,x-plate-ohms = <660>;
	};

};

	pinctrl_i2c2: i2c2grp {
		fsl,pins = <
			MX6UL_PAD_CSI_VSYNC__I2C2_SDA    0x4001b8b0
			MX6UL_PAD_CSI_HSYNC__I2C2_SCL    0x4001b8b0
			MX6UL_PAD_GPIO1_IO02__GPIO1_IO02	0x1b0b0 /* Interrupt */
			>;
		};