Date:   Wed, 9 Sep 2020 15:48:57 +0000
From:   Hugues FRUCHET <hugues.fruchet@...com>
To:     "Lad, Prabhakar" <prabhakar.csengg@...il.com>
CC:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Jacopo Mondi <jacopo+renesas@...ndi.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Steve Longerbeam <slongerbeam@...il.com>,
        Paul <paul.kocialkowski@...tlin.com>,
        "linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-renesas-soc@...r.kernel.org" 
        <linux-renesas-soc@...r.kernel.org>,
        "Biju Das" <biju.das.jz@...renesas.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>
Subject: Re: [PATCH v4 3/6] media: i2c: ov5640: Enable data pins on poweron
 for DVP mode

Hi Prabhakar,

I have checked quickly both OK and KO traces an some differences are 
ther that we have to understand, see bottom of this mail.

On 9/7/20 4:35 PM, Lad, Prabhakar wrote:
> Hi Hugues,
> 
> Thank you for the review.
> 
> On Mon, Sep 7, 2020 at 10:44 AM Hugues FRUCHET <hugues.fruchet@...com> wrote:
>>
>> Hi Prabhakar,
>>
>> Thanks for your patches, good to see one more OV5640 stakeholder
>> upstreaming some fixes/features.
>>
>> I'm also using a parallel setup with OV5640 connected on STM32 DCMI
>> camera interface.
>> First basic tests have not shown any regressions on my side but I would
>> like to better understand the problem you encountered and the way you
>> solve it, see below my comments.
>>
>>
> Thank you for testing the patches.
> 
>> On 9/4/20 10:18 PM, Lad Prabhakar wrote:
>>> During testing this sensor on iW-RainboW-G21D-Qseven platform in 8-bit DVP
>>> mode with rcar-vin bridge noticed the capture worked fine for the first run
>>> (with yavta), but for subsequent runs the bridge driver waited for the
>>> frame to be captured. Debugging further noticed the data lines were
>>> enabled/disabled in stream on/off callback and dumping the register
>>> contents 0x3017/0x3018 in ov5640_set_stream_dvp() reported the correct
>>> values, but yet frame capturing failed.
>>
>> Could you show the sequence of V4L2 calls which lead to freeze ?
>>
>> Reading the patch you proposed, my guess is that issue is coming when
>> multiple S_STREAM(on)/S_STREAM(off) are made while power remains, is
>> that true ?

So reading your traces, we are not in that case...

>> I have added some traces in code and tried to reproduce with yavta,
>> v4l2-ctl and GStreamer but I'm not able to generate such sequence, here
>> is what I got everytime:
>>
>> [  809.113790] ov5640 0-003c: ov5640_s_power>
>> [  809.116431] ov5640 0-003c: ov5640_set_power>
>> [  809.120788] ov5640 0-003c: ov5640_set_power_on>
>> [  809.622047] ov5640 0-003c: ov5640_set_power_dvp>
>> [  809.862734] ov5640 0-003c: ov5640_s_stream>
>> [  809.865462] ov5640 0-003c: ov5640_set_stream_dvp on>
>> <capturing here>
>> [  828.549531] ov5640 0-003c: ov5640_s_stream>
>> [  828.552265] ov5640 0-003c: ov5640_set_stream_dvp off>
>> [  828.580970] ov5640 0-003c: ov5640_s_power>
>> [  828.583613] ov5640 0-003c: ov5640_set_power>
>> [  828.587921] ov5640 0-003c: ov5640_set_power_dvp>
>> [  828.620346] ov5640 0-003c: ov5640_set_power_off>
>>
>> Which application/command line are you using to reproduce your problem ?
>>
> yavta.
>>
>>>
>>> To get around this issue data lines are enabled in s_power callback.
>>> (Also the sensor remains in power down mode if not streaming so power
>>> consumption shouldn't be affected)
>>
>> For the time being, I really don't understand why this patch is fixing
>> capture freeze.
>>
> 
> Below is the log with this series applied in DVP mode:
> 
> root@...21m:~#
> root@...21m:~# ./yavta /dev/video0 -c1 -n3 -s640x480 -fUYVY -Fov.raw
> [   36.191661] ov5640_s_power>
> [   36.194452] ov5640_set_power>
> [   36.197413] ov5640_set_power_on>
> [   36.200714] ov5640_reset>
> [   36.203328] ov5640_restore_mode>
> [   36.206549] ov5640_load_regs>
> [   36.550255] ov5640_set_timings>
> [   36.554572] ov5640_set_mode>
> [   36.557963] ov5640_calc_pixel_rate>
> [   36.561458] ov5640_set_dvp_pclk>
> [   36.564679] ov5640_calc_pclk>
> [   36.567639] ov5640_calc_sys_clk>
> [   36.572190] ov5640_set_mode_direct>
> [   36.575671] ov5640_load_regs>
> [   36.583205] ov5640_set_timings>
> [   36.591494] ov5640_set_framefmt>
> [   36.595717] ov5640_set_power_dvp>
> [   36.599486] ov5640_s_ctrl>
> [   36.602200] ov5640_set_ctrl_white_balance>
> [   36.606550] ov5640_s_ctrl>
> [   36.609250] ov5640_set_ctrl_exposure>
> [   36.613179] ov5640_s_ctrl>
> [   36.615878] ov5640_set_ctrl_gain>
> [   36.619446] ov5640_s_ctrl>
> [   36.622160] ov5640_set_ctrl_saturation>
> [   36.626476] ov5640_s_ctrl>
> [   36.629177] ov5640_set_ctrl_hue>
> [   36.632670] ov5640_s_ctrl>
> [   36.635370] ov5640_set_ctrl_contrast>
> [   36.639282] ov5640_s_ctrl>
> [   36.642112] ov5640_s_ctrl>
> [   36.644813] ov5640_set_ctrl_hflip>
> [   36.648465] ov5640_s_ctrl>
> [   36.651179] ov5640_set_ctrl_vflip>
> [   36.654833] ov5640_s_ctrl>
> [   36.657533] ov5640_set_ctrl_light_freq>
> Device /dev/video0 opened.
> Device `R_Car_VIN' on `platform:e6ef3[   36.662120] ov5640_set_fmt>
> 000.video' (driver 'rcar_vin') supports video, capture, without [
> 36.670491] ov5640_try_fmt_internal>
> mplanes.
> [   36.679593] ov5640_find_mode>
> [   36.683428] ov5640_calc_pixel_rate>
> Video format set: UYVY (59565955) 640x480 (stride 1280) field none
> buffer size 614400
> Video format: UYVY (59565955) 640x480 (stride 1280) field none buffer
> siz[   36.696456] ov5640_s_stream>
> e 614400
> 4 buffers requested.
> length: 614400 offset: 0 timesta[   36.703716] ov5640_set_stream_dvp>
> mp type/source: mono/EoF
> Buffer 0/0 mapped at address 0xb6b4c000.
> length: 614400 offset: 614400 timestamp type/source: mono/EoF
> Buffer 1/0 mapped at address 0xb6ab6000.
> length: 614400 offset: 1228800 timestamp type/source: mono/EoF
> Buffer 2/0 mapped at address 0xb6a20000.
> length: 614400 offset: 1843200 timestamp type/source: mono/EoF
> Buffer 3/0 mapped at address 0xb698a000.
> 0 (0) [-] none 0 614400 B 36.776928 36.776946 15.545 fps ts mono/EoF
> [   36.900255] ov5640_s_stream>
> [   36.903130] ov5640_set_stream_dvp>
> Captured 1 frames in 0.064348 seconds (15.540378 fps, 9548008.11[
> 36.907351] ov5640_s_power>
> 2077 B/s).
> 4 buffers released.
> [   36.915167] ov5640_set_power>
> [   36.920979] ov5640_set_power_dvp>
> [   36.924765] ov5640_set_power_off>
> root@...21m:~#
> root@...21m:~#
> root@...21m:~# dmesg | grep ov5640
> [    2.412247] ov5640_probe>
> [    2.414913] ov5640_get_regulators>
> [    2.418320] ov5640 1-003c: supply DOVDD not found, using dummy regulator
> [    2.425089] ov5640 1-003c: supply AVDD not found, using dummy regulator
> [    2.431758] ov5640 1-003c: supply DVDD not found, using dummy regulator
> [    2.438406] ov5640_check_chip_id>
> [    2.441724] ov5640_set_power_on>
> [    2.444996] ov5640_reset>
> [    2.447664] ov5640 1-003c: ov5640_read_reg: error: reg=300a
> [    2.453241] ov5640 1-003c: ov5640_check_chip_id: failed to read
> chip identifier
> [    2.460548] ov5640_set_power_off>
> [    2.464096] ov5640_probe>
> [    2.466755] ov5640_get_regulators>
> [    2.470159] ov5640 3-003c: supply DOVDD not found, using dummy regulator
> [    2.476917] ov5640 3-003c: supply AVDD not found, using dummy regulator
> [    2.483588] ov5640 3-003c: supply DVDD not found, using dummy regulator
> [    2.490240] ov5640_check_chip_id>
> [    2.493548] ov5640_set_power_on>
> [    2.496805] ov5640_reset>
> [    2.499705] ov5640_set_power_off>
> [    2.503033] ov5640_init_controls>
> [    2.506342] ov5640_calc_pixel_rate>
> [    2.511902] ov5640_enum_mbus_code>
> [    2.515297] ov5640_enum_mbus_code>
> [    2.518826] ov5640_get_fmt>
> [    4.381930] ov5640_s_power>
> [    4.384725] ov5640_set_power>
> [    4.387687] ov5640_set_power_on>
> [    4.391301] ov5640_reset>
> [    4.393920] ov5640_restore_mode>
> [    4.397142] ov5640_load_regs>
> [    4.750263] ov5640_set_timings>
> [    4.754620] ov5640_set_mode>
> [    4.758008] ov5640_calc_pixel_rate>
> [    4.761513] ov5640_set_dvp_pclk>
> [    4.764734] ov5640_calc_pclk>
> [    4.767701] ov5640_calc_sys_clk>
> [    4.772239] ov5640_set_mode_direct>
> [    4.775720] ov5640_load_regs>
> [    4.783195] ov5640_set_timings>
> [    4.791443] ov5640_set_framefmt>
> [    4.795659] ov5640_set_power_dvp>
> [    4.799426] ov5640_s_ctrl>
> [    4.802158] ov5640_set_ctrl_white_balance>
> [    4.806510] ov5640_s_ctrl>
> [    4.809210] ov5640_set_ctrl_exposure>
> [    4.813140] ov5640_s_ctrl>
> [    4.815840] ov5640_set_ctrl_gain>
> [    4.819415] ov5640_s_ctrl>
> [    4.822129] ov5640_set_ctrl_saturation>
> [    4.826449] ov5640_s_ctrl>
> [    4.829149] ov5640_set_ctrl_hue>
> [    4.832646] ov5640_s_ctrl>
> [    4.835352] ov5640_set_ctrl_contrast>
> [    4.839269] ov5640_s_ctrl>
> [    4.842099] ov5640_s_ctrl>
> [    4.844800] ov5640_set_ctrl_hflip>
> [    4.848455] ov5640_s_ctrl>
> [    4.851169] ov5640_set_ctrl_vflip>
> [    4.854831] ov5640_s_ctrl>
> [    4.857531] ov5640_set_ctrl_light_freq>
> [    4.862077] ov5640_s_power>
> [    4.864864] ov5640_set_power>
> [    4.867824] ov5640_set_power_dvp>
> [    4.871625] ov5640_set_power_off>
> [   36.191661] ov5640_s_power>
> [   36.194452] ov5640_set_power>
> [   36.197413] ov5640_set_power_on>
> [   36.200714] ov5640_reset>
> [   36.203328] ov5640_restore_mode>
> [   36.206549] ov5640_load_regs>
> [   36.550255] ov5640_set_timings>
> [   36.554572] ov5640_set_mode>
> [   36.557963] ov5640_calc_pixel_rate>
> [   36.561458] ov5640_set_dvp_pclk>
> [   36.564679] ov5640_calc_pclk>
> [   36.567639] ov5640_calc_sys_clk>
> [   36.572190] ov5640_set_mode_direct>
> [   36.575671] ov5640_load_regs>
> [   36.583205] ov5640_set_timings>
> [   36.591494] ov5640_set_framefmt>
> [   36.595717] ov5640_set_power_dvp>
> [   36.599486] ov5640_s_ctrl>
> [   36.602200] ov5640_set_ctrl_white_balance>
> [   36.606550] ov5640_s_ctrl>
> [   36.609250] ov5640_set_ctrl_exposure>
> [   36.613179] ov5640_s_ctrl>
> [   36.615878] ov5640_set_ctrl_gain>
> [   36.619446] ov5640_s_ctrl>
> [   36.622160] ov5640_set_ctrl_saturation>
> [   36.626476] ov5640_s_ctrl>
> [   36.629177] ov5640_set_ctrl_hue>
> [   36.632670] ov5640_s_ctrl>
> [   36.635370] ov5640_set_ctrl_contrast>
> [   36.639282] ov5640_s_ctrl>
> [   36.642112] ov5640_s_ctrl>
> [   36.644813] ov5640_set_ctrl_hflip>
> [   36.648465] ov5640_s_ctrl>
> [   36.651179] ov5640_set_ctrl_vflip>
> [   36.654833] ov5640_s_ctrl>
> [   36.657533] ov5640_set_ctrl_light_freq>
> [   36.662120] ov5640_set_fmt>
> [   36.670491] ov5640_try_fmt_internal>
> [   36.679593] ov5640_find_mode>
> [   36.683428] ov5640_calc_pixel_rate>
> [   36.696456] ov5640_s_stream>
> [   36.703716] ov5640_set_stream_dvp>
> [   36.900255] ov5640_s_stream>
> [   36.903130] ov5640_set_stream_dvp>
> [   36.907351] ov5640_s_power>
> [   36.915167] ov5640_set_power>
> [   36.920979] ov5640_set_power_dvp>
> [   36.924765] ov5640_set_power_off>
> root@...21m:~#
> root@...21m:~#
> root@...21m:~# dmesg --clear
> root@...21m:~#
> root@...21m:~# ./yavta /dev/video0 -c1 -n3 -s640x480 -fUYVY -Fov.raw
> [   72.934594] ov5640_s_power>
> [   72.937385] ov5640_set_power>
> [   72.940385] ov5640_set_power_on>
> [   72.943658] ov5640_reset>
> [   72.946273] ov5640_restore_mode>
> [   72.949493] ov5640_load_regs>
> [   73.290250] ov5640_set_timings>
> [   73.294578] ov5640_set_mode>
> [   73.297974] ov5640_calc_pixel_rate>
> [   73.301470] ov5640_set_dvp_pclk>
> [   73.304689] ov5640_calc_pclk>
> [   73.307649] ov5640_calc_sys_clk>
> [   73.312190] ov5640_set_mode_direct>
> [   73.315671] ov5640_load_regs>
> [   73.323202] ov5640_set_timings>
> [   73.331533] ov5640_set_framefmt>
> [   73.335765] ov5640_set_power_dvp>
> [   73.339539] ov5640_s_ctrl>
> [   73.342254] ov5640_set_ctrl_white_balance>
> [   73.346605] ov5640_s_ctrl>
> [   73.349305] ov5640_set_ctrl_exposure>
> [   73.353234] ov5640_s_ctrl>
> [   73.355934] ov5640_set_ctrl_gain>
> [   73.359503] ov5640_s_ctrl>
> [   73.362217] ov5640_set_ctrl_saturation>
> [   73.366537] ov5640_s_ctrl>
> [   73.369237] ov5640_set_ctrl_hue>
> [   73.372733] ov5640_s_ctrl>
> [   73.375434] ov5640_set_ctrl_contrast>
> [   73.379349] ov5640_s_ctrl>
> [   73.382180] ov5640_s_ctrl>
> [   73.384888] ov5640_set_ctrl_hflip>
> [   73.388543] ov5640_s_ctrl>
> [   73.391257] ov5640_set_ctrl_vflip>
> [   73.394914] ov5640_s_ctrl>
> [   73.397615] ov5640_set_ctrl_light_freq>
> Device /dev/video0 opened.
> Device `R_Car_VIN' on `platform:e6ef3[   73.402191] ov5640_set_fmt>
> 000.video' (driver 'rcar_vin') supports video, capture, without [
> 73.410568] ov5640_try_fmt_internal>
> mplanes.
> [   73.419661] ov5640_find_mode>
> [   73.423489] ov5640_calc_pixel_rate>
> Video format set: UYVY (59565955) 640x480 (stride 1280) field none
> buffer size 614400
> Video for[   73.430741] ov5640_s_stream>
> mat: UYVY (59565955) 640x480 (stride 1280) field none buffer siz[
> 73.438227] ov5640_set_stream_dvp>
> e 614400
> 4 buffers requested.
> length: 614400 offset: 0 timestamp type/source: mono/EoF
> Buffer 0/0 mapped at address 0xb6b7e000.
> length: 614400 offset: 614400 timestamp type/source: mono/EoF
> Buffer 1/0 mapped at address 0xb6ae8000.
> length: 614400 offset: 1228800 timestamp type/source: mono/EoF
> Buffer 2/0 mapped at address 0xb6a52000.
> length: 614400 offset: 1843200 timestamp type/source: mono/EoF
> Buffer 3/0 mapped at address 0xb69bc000.
> 0 (0) [-] none 0 614400 B 73.544608 73.544626 10.257 fps ts mono/EoF
> [   73.670256] ov5640_s_stream>
> [   73.673132] ov5640_set_stream_dvp>
> Captured 1 frames in 0.097510 seconds (10.255285 fps, 6300846.98[
> 73.677350] ov5640_s_power>
> 3972 B/s).
> 4 buffers released.
> [   73.685162] ov5640_set_power>
> [   73.690979] ov5640_set_power_dvp>
> [   73.694757] ov5640_set_power_off>
> root@...21m:~#
> root@...21m:~#
> root@...21m:~#
> 
> Below is the log without the series applied in DVP mode:
> 
> root@...21m:~# ./yavta /dev/video0 -c1 -n3 -s640x480 -fUYVY -Fov.raw
> [   45.262397] ov5640_s_power>
> [   45.265189] ov5640_set_power>
> [   45.268150] ov5640_set_power_on>
> [   45.271455] ov5640_reset>
> [   45.274071] ov5640_restore_mode>
> [   45.621705] ov5640_set_mode>
> [   45.625104] ov5640_calc_pixel_rate>
> [   45.629916] ov5640_set_mode_direct>
> [   45.640983] ov5640_get_sysclk>
> [   45.646295] ov5640_set_framefmt>
> [   45.650537] ov5640_s_ctrl>
> [   45.653237] ov5640_set_ctrl_white_balance>
> [   45.657588] ov5640_s_ctrl>
> [   45.660289] ov5640_set_ctrl_exposure>
> [   45.664217] ov5640_s_ctrl>
> [   45.666918] ov5640_set_ctrl_gain>
> [   45.670483] ov5640_s_ctrl>
> [   45.673201] ov5640_set_ctrl_saturation>
> [   45.677523] ov5640_s_ctrl>
> [   45.680223] ov5640_set_ctrl_hue>
> [   45.683721] ov5640_s_ctrl>
> [   45.686684] ov5640_s_ctrl>
> [   45.689501] ov5640_s_ctrl>
> [   45.692213] ov5640_set_ctrl_hflip>
> [   45.695870] ov5640_s_ctrl>
> [   45.698570] ov5640_set_ctrl_vflip>
> [   45.702240] ov5640_s_ctrl>
> [   45.704940] ov5640_set_ctrl_light_freq>
> Device /dev/video0 opened.
> Device `R_Car_VIN' on `platform:e6ef1[   45.709474] ov5640_set_fmt>
> 000.video' (driver 'rcar_vin') supports video, capture, without [
> 45.717852] ov5640_try_fmt_internal>
> mplanes.
> [   45.726964] ov5640_find_mode>
> [   45.730785] ov5640_calc_pixel_rate>
> Video format set: UYVY (59565955) 640x480 (stride 1280) field none
> buffer size 614400
> Video format: UYVY (59565955) 640x480 (stride 1280) field none buffer
> siz[   45.743733] ov5640_s_stream>
> e 614400
> 4 buffers requested.
> length: 614400 offset: 0 timesta[   45.751076] ov5640_set_stream_dvp>
> mp type/source: mono/EoF
> Buffer 0/0 mapped at address 0xb6b61000.
> length: 614400 offset: 614400 timestamp type/source: mono/EoF
> Buffer 1/0 mapped at address 0xb6acb000.
> length: 614400 offset: 1228800 timestamp type/source: mono/EoF
> Buffer 2/0 mapped at address 0xb6a35000.
> length: 614400 offset: 1843200 timestamp type/source: mono/EoF
> Buffer 3/0 mapped at address 0xb699f000.
> ^C[   57.048902] ov5640_s_stream>
> [   57.051800] ov5640_set_stream_dvp>
> [   57.056180] ov5640_s_power>
> [   57.058967] ov5640_set_power>
> [   57.061943] ov5640_set_power_off>
> 
> root@...21m:~#
> 
> 
> 
> 
> root@...21m:~# dmesg | grep ov564
> [    2.412449] ov5640 1-003c: supply DOVDD not found, using dummy regulator
> [    2.419202] ov5640 1-003c: supply AVDD not found, using dummy regulator
> [    2.425872] ov5640 1-003c: supply DVDD not found, using dummy regulator
> [    2.432527] ov5640_set_power_on>
> [    2.435801] ov5640_reset>
> [    2.438704] ov5640_set_power_off>
> [    2.442037] ov5640_init_controls>
> [    2.445346] ov5640_calc_pixel_rate>
> [    2.450955] ov5640_enum_mbus_code>
> [    2.454350] ov5640_enum_mbus_code>
> [    2.457882] ov5640_get_fmt>
> [    4.222662] ov5640_s_power>
> [    4.225458] ov5640_set_power>
> [    4.228420] ov5640_set_power_on>
> [    4.231737] ov5640_reset>
> [    4.234356] ov5640_restore_mode>
> [    4.591733] ov5640_set_mode>
> [    4.595133] ov5640_calc_pixel_rate>
> [    4.599930] ov5640_set_mode_direct>
> [    4.610913] ov5640_get_sysclk>
> [    4.616195] ov5640_set_framefmt>
> [    4.620424] ov5640_s_ctrl>
> [    4.623136] ov5640_set_ctrl_white_balance>
> [    4.627485] ov5640_s_ctrl>
> [    4.630185] ov5640_set_ctrl_exposure>
> [    4.634115] ov5640_s_ctrl>
> [    4.636815] ov5640_set_ctrl_gain>
> [    4.640382] ov5640_s_ctrl>
> [    4.643095] ov5640_set_ctrl_saturation>
> [    4.647412] ov5640_s_ctrl>
> [    4.650112] ov5640_set_ctrl_hue>
> [    4.653612] ov5640_s_ctrl>
> [    4.656573] ov5640_s_ctrl>
> [    4.659389] ov5640_s_ctrl>
> [    4.662105] ov5640_set_ctrl_hflip>
> [    4.665760] ov5640_s_ctrl>
> [    4.668460] ov5640_set_ctrl_vflip>
> [    4.672126] ov5640_s_ctrl>
> [    4.674826] ov5640_set_ctrl_light_freq>
> [    4.679405] ov5640_s_power>
> [    4.682211] ov5640_set_power>
> [    4.685171] ov5640_set_power_off>
> [   45.262397] ov5640_s_power>
> [   45.265189] ov5640_set_power>
> [   45.268150] ov5640_set_power_on>
> [   45.271455] ov5640_reset>
> [   45.274071] ov5640_restore_mode>
> [   45.621705] ov5640_set_mode>
> [   45.625104] ov5640_calc_pixel_rate>
> [   45.629916] ov5640_set_mode_direct>
> [   45.640983] ov5640_get_sysclk>
> [   45.646295] ov5640_set_framefmt>
> [   45.650537] ov5640_s_ctrl>
> [   45.653237] ov5640_set_ctrl_white_balance>
> [   45.657588] ov5640_s_ctrl>
> [   45.660289] ov5640_set_ctrl_exposure>
> [   45.664217] ov5640_s_ctrl>
> [   45.666918] ov5640_set_ctrl_gain>
> [   45.670483] ov5640_s_ctrl>
> [   45.673201] ov5640_set_ctrl_saturation>
> [   45.677523] ov5640_s_ctrl>
> [   45.680223] ov5640_set_ctrl_hue>
> [   45.683721] ov5640_s_ctrl>
> [   45.686684] ov5640_s_ctrl>
> [   45.689501] ov5640_s_ctrl>
> [   45.692213] ov5640_set_ctrl_hflip>
> [   45.695870] ov5640_s_ctrl>
> [   45.698570] ov5640_set_ctrl_vflip>
> [   45.702240] ov5640_s_ctrl>
> [   45.704940] ov5640_set_ctrl_light_freq>
> [   45.709474] ov5640_set_fmt>
> [   45.717852] ov5640_try_fmt_internal>
> [   45.726964] ov5640_find_mode>
> [   45.730785] ov5640_calc_pixel_rate>
> [   45.743733] ov5640_s_stream>
> [   45.751076] ov5640_set_stream_dvp>
> [   57.048902] ov5640_s_stream>
> [   57.051800] ov5640_set_stream_dvp>
> [   57.056180] ov5640_s_power>
> [   57.058967] ov5640_set_power>
> [   57.061943] ov5640_set_power_off>
> 
> Cheers,
> Prabhakar
> 

In order to commpare behaviours, I have taken the KO trace and marked 
with "--" the missing trace points compared to OK trace and with "++" 
the additional traces:

 > [    4.222662] ov5640_s_power>
 > [    4.225458] ov5640_set_power>
 > [    4.228420] ov5640_set_power_on>
 > [    4.231737] ov5640_reset>
 > [    4.234356] ov5640_restore_mode>
-- > [    4.397142] ov5640_load_regs>
-- > [    4.750263] ov5640_set_timings>
==> seems that register table load is not there. If it is a trace issue, 
please add the same trace points in code before modifications.
 > [    4.591733] ov5640_set_mode>
 > [    4.595133] ov5640_calc_pixel_rate>
-- > [    4.761513] ov5640_set_dvp_pclk>
-- > [    4.764734] ov5640_calc_pclk>
-- > [    4.767701] ov5640_calc_sys_clk>
=> missing pixel clock for DVP
 > [    4.599930] ov5640_set_mode_direct>
-- > [    4.397142] ov5640_load_regs>
-- > [    4.750263] ov5640_set_timings>
++ > [    4.610913] ov5640_get_sysclk>
 > [    4.616195] ov5640_set_framefmt>
-- > [    4.795659] ov5640_set_power_dvp>
 > [    4.620424] ov5640_s_ctrl>
 > [    4.623136] ov5640_set_ctrl_white_balance>
 > [    4.627485] ov5640_s_ctrl>
 > [    4.630185] ov5640_set_ctrl_exposure>
 > [    4.634115] ov5640_s_ctrl>
 > [    4.636815] ov5640_set_ctrl_gain>
 > [    4.640382] ov5640_s_ctrl>
 > [    4.643095] ov5640_set_ctrl_saturation>
 > [    4.647412] ov5640_s_ctrl>
 > [    4.650112] ov5640_set_ctrl_hue>
 > [    4.653612] ov5640_s_ctrl>
 > [    4.656573] ov5640_s_ctrl>
 > [    4.659389] ov5640_s_ctrl>
 > [    4.662105] ov5640_set_ctrl_hflip>
 > [    4.665760] ov5640_s_ctrl>
 > [    4.668460] ov5640_set_ctrl_vflip>
 > [    4.672126] ov5640_s_ctrl>
 > [    4.674826] ov5640_set_ctrl_light_freq>
 > [    4.679405] ov5640_s_power>
 > [    4.682211] ov5640_set_power>
-- > [    4.867824] ov5640_set_power_dvp>
 > [    4.685171] ov5640_set_power_off>
 > [   45.262397] ov5640_s_power>
 > [   45.265189] ov5640_set_power>
 > [   45.268150] ov5640_set_power_on>
 > [   45.271455] ov5640_reset>
 > [   45.274071] ov5640_restore_mode>
-- > [   36.206549] ov5640_load_regs>
-- > [   36.550255] ov5640_set_timings>
 > [   45.621705] ov5640_set_mode>
 > [   45.625104] ov5640_calc_pixel_rate>
-- > [   36.561458] ov5640_set_dvp_pclk>
-- > [   36.564679] ov5640_calc_pclk>
-- > [   36.567639] ov5640_calc_sys_clk>
 > [   45.629916] ov5640_set_mode_direct>
-- > [   36.575671] ov5640_load_regs>
-- > [   36.583205] ov5640_set_timings>
++ > [   45.640983] ov5640_get_sysclk>
 > [   45.646295] ov5640_set_framefmt>
-- > [   36.595717] ov5640_set_power_dvp>
 > [   45.650537] ov5640_s_ctrl>
 > [   45.653237] ov5640_set_ctrl_white_balance>
 > [   45.657588] ov5640_s_ctrl>
 > [   45.660289] ov5640_set_ctrl_exposure>
 > [   45.664217] ov5640_s_ctrl>
 > [   45.666918] ov5640_set_ctrl_gain>
 > [   45.670483] ov5640_s_ctrl>
 > [   45.673201] ov5640_set_ctrl_saturation>
 > [   45.677523] ov5640_s_ctrl>
 > [   45.680223] ov5640_set_ctrl_hue>
 > [   45.683721] ov5640_s_ctrl>
 > [   45.686684] ov5640_s_ctrl>
 > [   45.689501] ov5640_s_ctrl>
 > [   45.692213] ov5640_set_ctrl_hflip>
 > [   45.695870] ov5640_s_ctrl>
 > [   45.698570] ov5640_set_ctrl_vflip>
 > [   45.702240] ov5640_s_ctrl>
 > [   45.704940] ov5640_set_ctrl_light_freq>
 > [   45.709474] ov5640_set_fmt>
 > [   45.717852] ov5640_try_fmt_internal>
 > [   45.726964] ov5640_find_mode>
 > [   45.730785] ov5640_calc_pixel_rate>
 > [   45.743733] ov5640_s_stream>
 > [   45.751076] ov5640_set_stream_dvp>
 > [   57.048902] ov5640_s_stream>
 > [   57.051800] ov5640_set_stream_dvp>
 > [   57.056180] ov5640_s_power>
 > [   57.058967] ov5640_set_power>
 > [   57.061943] ov5640_set_power_off>




Best regards,
Hugues.

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