Re: omap3-isp segfault

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Ok I solved the segfault problem by updating some of my v4l2 files (specifically v4l2-common.c). Now I only get nice sounding console messages.

    Linux media interface: v0.10
    Linux video capture interface: v2.00
    omap3isp omap3isp: Revision 2.0 found
    omap-iommu omap-iommu.0: isp: version 1.1
    omap3isp omap3isp: hist: DMA channel = 4
    mt9v032 3-005c: Probing MT9V032 at address 0x5c
    omap3isp omap3isp: isp_set_xclk(): cam_xclka set to 28800000 Hz
    omap3isp omap3isp: isp_set_xclk(): cam_xclka set to 0 Hz
    mt9v032 3-005c: MT9V032 detected at address 0x5c

And a bunch of devices.

    # ls /dev
    ...
    v4l-subdev0
    v4l-subdev1
    v4l-subdev2
    v4l-subdev3
    v4l-subdev4
    v4l-subdev5
    v4l-subdev6
    v4l-subdev7
    v4l-subdev8
    ...
    video0
    video1
    video2
    video3
    video4
    video5
    video6
    ...

But don't know how to start the camera. How can I test the module?


Neil

On 11-01-26 11:32 AM, Neil MacMunn wrote:
Hello,

When I modprobe omap3-isp I get a segfault. I'm attempting to use a Gumstix Overo with Micron MT9V032.

   root@overo:~# modprobe omap3-isp
   Linux media interface: v0.10
   Linux video capture interface: v2.00
   omap3isp omap3isp: Revision 2.0 found
   Unable to handle kernel NULL pointer dereference at virtual address
   00000004
   pgd = cd4b0000
   [00000004] *pgd=8e77b031, *pte=00000000, *ppte=00000000
   Internal error: Oops: 17 [#1]
   last sysfs file: /sys/devices/virtual/net/lo/type
   Modules linked in: omap3_isp(+) v4l2_common videodev v4l1_compat
   media iovmm ipv6 libertas_sdio libertas lib80211 option usb_wwan
   ads7846 usbserial iommu
   CPU: 0    Not tainted  (2.6.36+ #9)
   PC is at iommu_get+0x74/0x108 [iommu]
   LR is at iommu_get+0x78/0x108 [iommu]
   pc : [<bf0009fc>]    lr : [<bf000a00>]    psr: 20000013
   sp : ced33db0  ip : 22222222  fp : bf100bb8
   r10: cdf48000  r9 : c0580938  r8 : 00000001
   r7 : 000003ff  r6 : ce78f218  r5 : 00000000  r4 : ce78f200
   r3 : 00000000  r2 : ffffffd0  r1 : 22222222  r0 : ce78f200
   Flags: nzCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment user
   Control: 10c5387d  Table: 8d4b0019  DAC: 00000015
   Process modprobe (pid: 1327, stack limit = 0xced322f0)
   Stack: (0xced33db0 to 0xced34000)
   3da0:                                     0000000e 00000000 cdf48000
   bf0f46a4
   3dc0: 00000001 c01096c4 ce54e848 c0580940 00000000 ce6347c0 cec54a58
   00000000
   3de0: bf102adc c0580940 c0580940 bf102adc bf102adc c05a10d0 ced33f64
   00000000
   3e00: ced32000 c023d49c bf102adc c023c4dc ced33f64 c0580940 c0580974
   bf102adc
   3e20: ced33e38 c023c624 00000000 c023c5c4 bf102adc c023bcdc cec21cf8
   cec4f5f0
   3e40: c05a10d0 00000000 bf102adc bf102adc ce6347c0 c023b5b4 bf101bdb
   cec02b88
   3e60: cec02b80 00000000 00000018 bf102adc bf104974 bf10c000 00000000
   c023c944
   3e80: 00000000 00000018 00000000 bf104974 bf10c000 c00353c0 00000198
   d12c0000
   3ea0: 00000000 00000018 00000000 00000000 00000018 00000000 bf104974
   00000000
   3ec0: ced33f7c c0085860 00000000 00000000 cdc95c9c ced33f70 01a960e8
   bf104980
   3ee0: 000003dd d13fa11c d12c0000 00197522 d13f98fc d13f96e0 d1454c9c
   cdd08000
   3f00: 00011abc 00014b2c 00000000 00000000 00000034 00000035 0000001a
   0000001e
   3f20: 00000011 00000000 6e72656b 00006c65 00000000 00000000 00000000
   00000000
   3f40: 00000000 00000000 00000000 00000000 00000000 00000000 00000000
   00000000
   3f60: 00000000 00000000 00000000 bf102174 00000003 00000000 00000000
   c053b028
   3f80: 00000073 00009720 00000000 00000000 00000080 c0036044 ced32000
   01a96090
   3fa0: 00000000 c0035ec0 00009720 00000000 40296000 00197522 01a960e8
   01a960e8
   3fc0: 00009720 00000000 00000000 00000080 00000000 01a9609c 01a96090
   00000000
   3fe0: 01a96120 beb95924 0000b180 40232084 60000010 40296000 00000000
   00000000
   [<bf0009fc>] (iommu_get+0x74/0x108 [iommu]) from [<bf0f46a4>]
   (isp_probe+0x258/0x9f0 [omap3_isp])
   [<bf0f46a4>] (isp_probe+0x258/0x9f0 [omap3_isp]) from [<c023d49c>]
   (platform_drv_probe+0x1c/0x24)
   [<c023d49c>] (platform_drv_probe+0x1c/0x24) from [<c023c4dc>]
   (driver_probe_device+0xcc/0x1b4)
   [<c023c4dc>] (driver_probe_device+0xcc/0x1b4) from [<c023c624>]
   (__driver_attach+0x60/0x84)
   [<c023c624>] (__driver_attach+0x60/0x84) from [<c023bcdc>]
   (bus_for_each_dev+0x4c/0x8c)
   [<c023bcdc>] (bus_for_each_dev+0x4c/0x8c) from [<c023b5b4>]
   (bus_add_driver+0xa0/0x21c)
   [<c023b5b4>] (bus_add_driver+0xa0/0x21c) from [<c023c944>]
   (driver_register+0xbc/0x148)
   [<c023c944>] (driver_register+0xbc/0x148) from [<c00353c0>]
   (do_one_initcall+0xc8/0x194)
   [<c00353c0>] (do_one_initcall+0xc8/0x194) from [<c0085860>]
   (sys_init_module+0x13f8/0x15bc)
   [<c0085860>] (sys_init_module+0x13f8/0x15bc) from [<c0035ec0>]
   (ret_fast_syscall+0x0/0x30)
   Code: e59f3098 e1a00004 e5933000 e1a0e00f (e593f004)
   ---[ end trace 7243c66244fbd250 ]---
     overo Internal error: Oops: 17 [#1]
     overo last sysfs file: /sys/devices/virtual/net/lo/type
     overo Process modprobe (pid: 1327, stack limit = 0xced322f0)
     overo Stack: (0xced33db0 to 0xced34000)
     overo 3da0:                                     0000000e 00000000
   cdf48000 bf0f46a4
     overo 3dc0: 00000001 c01096c4 ce54e848 c0580940 00000000 ce6347c0
   cec54a58 00000000
     overo 3de0: bf102adc c0580940 c0580940 bf102adc bf102adc c05a10d0
   ced33f64 00000000
     overo 3e00: ced32000 c023d49c bf102adc c023c4dc ced33f64 c0580940
   c0580974 bf102adc
     overo 3e20: ced33e38 c023c624 00000000 c023c5c4 bf102adc c023bcdc
   cec21cf8 cec4f5f0
     overo 3e40: c05a10d0 00000000 bf102adc bf102adc ce6347c0 c023b5b4
   bf101bdb cec02b88
     overo 3e60: cec02b80 00000000 00000018 bf102adc bf104974 bf10c000
   00000000 c023c944
     overo 3e80: 00000000 00000018 00000000 bf104974 bf10c000 c00353c0
   00000198 d12c0000
     overo 3ea0: 00000000 00000018 00000000 00000000 00000018 00000000
   bf104974 00000000
     overo 3ec0: ced33f7c c0085860 00000000 00000000 cdc95c9c ced33f70
   01a960e8 bf104980
     overo 3ee0: 000003dd d13fa11c d12c0000 00197522 d13f98fc d13f96e0
   d1454c9c cdd08000
     overo 3f00: 00011abc 00014b2c 00000000 00000000 00000034 00000035
   0000001a 0000001e
     overo 3f20: 00000011 00000000 6e72656b 00006c65 00000000 00000000
   00000000 00000000
     overo 3f40: 00000000 00000000 00000000 00000000 00000000 00000000
   00000000 00000000
     overo 3f60: 00000000 00000000 00000000 bf102174 00000003 00000000
   00000000 c053b028
     overo 3f80: 00000073 00009720 00000000 00000000 00000080 c0036044
   ced32000 01a96090
     overo 3fa0: 00000000 c0035ec0 00009720 00000000 40296000 00197522
   01a960e8 01a960e8
     overo 3fc0: 00009720 00000000 00000000 00000080 00000000 01a9609c
   01a96090 00000000
     overo 3fe0: 01a96120 beb95924 0000b180 40232084 60000010 40296000
   00000000 00000000
     overo Code: e59f3098 e1a00004 e5933000 e1a0e00f (e593f004)
   Segmentation fault


My ISP and MT9V032 code come from http://git.linuxtv.org/pinchartl/media.git?a=shortlog;h=refs/heads/media-0006-sensors and my board-overo.c (based on board-rx51.c) contains:

   ...
   static int __init overo_i2c_init(void)
   {
        omap_register_i2c_bus(1, 2600, overo_i2c_boardinfo,
                ARRAY_SIZE(overo_i2c_boardinfo));
        /* i2c2 pins are used for gpio */
        omap_register_i2c_bus(3, 400, NULL, 0);
        return 0;
   }
   ...
   #include <media/mt9v032.h>
   #include "devices.h"
   #include "../../../drivers/media/video/isp/isp.h"
   #include "../../../drivers/media/video/isp/ispreg.h"

   #define MT9V032_I2C_BUS_NUM        (0x03)
   #define MT9V032_I2C_ADDR        (0x5C)
   #define MT9V032_XCLK            (0x00)

   static void mt9v032_set_clock(struct v4l2_subdev *subdev, unsigned
   int rate)
   {
struct isp_device *isp = v4l2_dev_to_isp_device(subdev->v4l2_dev);

        isp->platform_cb.set_xclk(isp, rate, MT9V032_XCLK);
   }

   static struct mt9v032_platform_data mt9v032_platform_data = {
        .clk_pol = 0,
        .set_clock = mt9v032_set_clock,
   };

   static struct i2c_board_info mt9v032_i2c_board_info[] = {
        {
            I2C_BOARD_INFO("mt9v032", MT9V032_I2C_ADDR),
            .platform_data    = &mt9v032_platform_data,
        },
   };

   static struct isp_subdev_i2c_board_info pixhawk_camera_subdevs[] = {
        {
            .board_info = &mt9v032_i2c_board_info[0],
            .i2c_adapter_id = MT9V032_I2C_BUS_NUM,
        },
        { NULL, 0, },
   };

static struct isp_v4l2_subdevs_group pixhawk_camera_subdevs_group[] = {
            {
            .subdevs = pixhawk_camera_subdevs,
            .interface = ISP_INTERFACE_PARALLEL,
            .bus = { .parallel = {
                    .data_lane_shift        = 0,
                    .clk_pol                = 1,
                    .bridge                 = ISPCTRL_PAR_BRIDGE_DISABLE,
             } },
        },
        { NULL, 0, },
   };

   static struct isp_platform_data isp_platform_data = {
        .subdevs = pixhawk_camera_subdevs_group,
   };

   static void __init overo_init(void)
   {
        overo_i2c_init();
        if (omap3_init_camera(&isp_platform_data) < 0)
            printk(KERN_WARNING "%s: Unable to register camera platform "
                   "device\n", __func__);
   ...


I've had this hardware working with older kernels but I'm trying to make the conversion to the subdev api and a better driver (thanks Laurent!). Anyone know what might be going on? This is my first linux-media post so if I've commited any faux pas please let me know. Thanks!

Neil
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