i.mx35 kernel freeze on booting

i.mx35 kernel freeze on booting

[Ivan Stoyanov]

Hello group,

I am working on i.mx35 based board and I have found a problem with mx3fb 
driver. On boot kernel freeze during mx3fb driver initialization and 
reboot after few seconds. I tried to debug with prints and found that 
kernel freeze as soon as writing SDC_COM_BG_EN in SDC_COM_CONF register.

Could you please give me advice how get more debug information?

[    1.018314] Remapped [mem 0x53fc00b4-0x53fc01bf] at f57c00b4
[    1.024010] dmaengine: private_candidate: dma0chan0 filter said false
[    1.030591] dmaengine: private_candidate: dma0chan1 filter said false
[    1.037044] dmaengine: private_candidate: dma0chan2 filter said false
[    1.043643] dmaengine: private_candidate: dma0chan3 filter said false
[    1.050096] dmaengine: private_candidate: dma0chan4 filter said false
[    1.056692] dmaengine: private_candidate: dma0chan5 filter said false
[    1.063146] dmaengine: private_candidate: dma0chan6 filter said false
[    1.069742] dmaengine: private_candidate: dma0chan7 filter said false
[    1.076233] dmaengine: private_candidate: dma0chan8 filter said false
[    1.082843] dmaengine: private_candidate: dma0chan9 filter said false
[    1.089296] dmaengine: private_candidate: dma0chan10 filter said false
[    1.095894] dmaengine: private_candidate: dma0chan11 filter said false
[    1.102491] dmaengine: private_candidate: dma0chan12 filter said false
[    1.109102] dmaengine: private_candidate: dma0chan13 filter said false
[    1.115718] IPU: mapped source 14 to IRQ 176
[    1.198869] ipu-core ipu-core: init channel = 14
[    1.203638] ipu-core ipu-core: IDMAC_CONF 0x70, IC_CONF 0x0, 
IDMAC_CHA_EN 0x0, IDMAC_CHA_PRI 0x4000, IDMAC_        CHA_BUSY 0x0
[    1.214447] ipu-core ipu-core: BUF0_RDY 0x4000, BUF1_RDY 0x0, CUR_BUF 
0x0, DB_MODE 0x0, TASKS_STAT 0x2003
[    1.224442] dma dma0chan14: Found channel 0xe, irq 176
[    1.229690] dmaengine: __dma_request_channel: success (dma0chan14)
[    1.235966] return 1
[    1.238276] mx3_sdc_fb mx3_sdc_fb: mx3fb_check_var
[    1.243121] mx3_sdc_fb mx3_sdc_fb: mx3fb_check_var
[    1.247989] mx3_sdc_fb mx3_sdc_fb: sdc_set_brightness: value = 255
[    1.254238] mx3_sdc_fb mx3_sdc_fb: disabling irq 176
[    1.270275] mx3_sdc_fb mx3_sdc_fb: allocated fb @ p=0x97000000, 
v=0xd887d000, size=1536000.
[    1.294524] mx3_sdc_fb mx3_sdc_fb: pixclock = 33260000l Hz
[    1.300118] mx3_sdc_fb mx3_sdc_fb: panel size = 800 x 480
[    1.305528]  hor_conf 3e80000, ver_conf 1f40001
[    1.310266] mx3_sdc_fb mx3_sdc_fb: InitPanel() - Pixel clock divider 
less than 4
[    1.317813] mx3_sdc_fb mx3_sdc_fb: pixel clk = 33260000, divider 4.0
[    1.324272] mx3_sdc_fb mx3_sdc_fb: DI_DISP_IF_CONF = 0x04000000
[    1.330209] mx3_sdc_fb mx3_sdc_fb: DI_DISP_SIG_POL = 0x06000000
[    1.336287] mx3_sdc_fb mx3_sdc_fb: DI_DISP3_TIME_CONF = 0x01C00040
[    1.348164] mx3_sdc_fb mx3_sdc_fb: mx3fbi d798d25c, txd = NULL
[    1.354123] ipu-core ipu-core: write param mem - addr = 0x000100E0, 
data = 0x00000000
[    1.362003] ipu-core ipu-core: write param mem - addr = 0x000100E1, 
data = 0x00004000
[    1.369987] ipu-core ipu-core: write param mem - addr = 0x000100E2, 
data = 0x00000000
[    1.377835] ipu-core ipu-core: write param mem - addr = 0x000100E3, 
data = 0xDF31F000
[    1.385821] ipu-core ipu-core: write param mem - addr = 0x000100E4, 
data = 0x00000001
[    1.393670] ipu-core ipu-core: write param mem - addr = 0x000100E8, 
data = 0x97000000
[    1.401655] ipu-core ipu-core: write param mem - addr = 0x000100E9, 
data = 0x00000000
[    1.409504] ipu-core ipu-core: write param mem - addr = 0x000100EA, 
data = 0x1E0831FA
[    1.417490] ipu-core ipu-core: write param mem - addr = 0x000100EB, 
data = 0x96416502
[    1.425338] ipu-core ipu-core: write param mem - addr = 0x000100EC, 
data = 0x00000000
[    1.433323] dma dma0chan14: Submitting sg d798d2d4
[    1.438224] dma dma0chan14: Updated sg d798d2d4 on channel 0xe buffer 0
[    1.444864] ipu-core ipu-core: IDMAC_CONF 0x70, IC_CONF 0x0, 
IDMAC_CHA_EN 0x0, IDMAC_CHA_PRI 0x4000, IDMAC_        CHA_BUSY 0x0
[    1.455798] ipu-core ipu-core: BUF0_RDY 0x4000, BUF1_RDY 0x0, CUR_BUF 
0x0, DB_MODE 0x0, TASKS_STAT 0x3
[    1.465214] ipu-core ipu-core: IDMAC_CONF 0x70, IC_CONF 0x0, 
IDMAC_CHA_EN 0x4000, IDMAC_CHA_PRI 0x4000, IDM        AC_CHA_BUSY 0x0
[    1.476365] ipu-core ipu-core: BUF0_RDY 0x4000, BUF1_RDY 0x0, CUR_BUF 
0x0, DB_MODE 0x0, TASKS_STAT 0x3
[    1.485807] mx3_sdc_fb mx3_sdc_fb: 422: Submit d887b09c #2 [+]
[    1.510871] mx3_sdc_fb mx3_sdc_fb: sdc_set_brightness: value = 255
[

Thank you in advance!

Regards,
Ivan

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re: i.mx35 kernel freeze on booting

[Hubert Chaumette]

> Message du 15/12/16 16:43
> De : "Ivan Stoyanov" 
> Hello group,
> 
> I am working on i.mx35 based board and I have found a problem with mx3fb 
> driver. On boot kernel freeze during mx3fb driver initialization and 
> reboot after few seconds. I tried to debug with prints and found that 
> kernel freeze as soon as writing SDC_COM_BG_EN in SDC_COM_CONF register.
> 
> Could you please give me advice how get more debug information?

Hi,

A few thoughts:
- compile the driver as module to make it to userspace before testing, you could then use ftrace and dynamic printk rather than recompilation (or only rebuild the module);
- check your platform data (device tree?) for wrong addresses;
- faulty hardware?
- activate locking debug in your kernel
- check for interrupt storm on enabling the channel (last comment in http://lxr.free-electrons.com/source/drivers/video/fbdev/mx3fb.c#L389)

Regards,

Hubert
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