Am 23.09.2012 23:21, schrieb Guennadi Liakhovetski:
> Hi Frank
>
> On Sun, 23 Sep 2012, Frank Schäfer wrote:
>
>> We currently don't select the register bank in ov2640_s_ctrl, so we can end up
>> writing to DSP register 0x04 instead of sensor register 0x04.
>> This happens for example when calling ov2640_s_ctrl after ov2640_s_fmt.
> Yes, in principle, I agree, bank switching in the driver is not very...
> consistent and also this specific case looks buggy. But, we have to fix
> your fix.
>
>> Signed-off-by: Frank Schäfer <fschaefer.oss@xxxxxxxxxxxxxx>
>> Cc: stable@xxxxxxxxxx
>> ---
>> drivers/media/i2c/soc_camera/ov2640.c | 8 ++++++++
>> 1 Datei geändert, 8 Zeilen hinzugefügt(+)
>>
>> diff --git a/drivers/media/i2c/soc_camera/ov2640.c b/drivers/media/i2c/soc_camera/ov2640.c
>> index 78ac574..e4fc79e 100644
>> --- a/drivers/media/i2c/soc_camera/ov2640.c
>> +++ b/drivers/media/i2c/soc_camera/ov2640.c
>> @@ -683,8 +683,16 @@ static int ov2640_s_ctrl(struct v4l2_ctrl *ctrl)
>> struct v4l2_subdev *sd =
>> &container_of(ctrl->handler, struct ov2640_priv, hdl)->subdev;
>> struct i2c_client *client = v4l2_get_subdevdata(sd);
>> + struct regval_list regval;
>> + int ret;
>> u8 val;
>>
>> + regval.reg_num = BANK_SEL;
>> + regval.value = BANK_SEL_SENS;
>> + ret = ov2640_write_array(client, ®val);
> This doesn't look right to me. ov2640_write_array() keeps writing register
> address - value pairs to the hardware until it encounters an "ENDMARKER,"
> which you don't have here, so, it's hard to say what will be written to
> the sensor... Secondly, you only have to write a single register here, for
> this the driver is already using i2c_smbus_write_byte_data() directly,
> please, do the same.
Argh, yes, you're right.
The mistake was to split this off from patch 3 to reduce changes for
stable...
I will combine both patches and resend the series.
Regards,
Frank
>
> Thanks
> Guennadi
>
>> + if (ret < 0)
>> + return ret;
>> +
>> switch (ctrl->id) {
>> case V4L2_CID_VFLIP:
>> val = ctrl->val ? REG04_VFLIP_IMG : 0x00;
>> --
>> 1.7.10.4
>>
> ---
> Guennadi Liakhovetski, Ph.D.
> Freelance Open-Source Software Developer
> http://www.open-technology.de/
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