On Wed, 14 Jun 2023 at 17:07, Ricardo Ribalda <ribalda@xxxxxxxxxxxx> wrote: > > Hi Soyer > > > On Wed, 14 Jun 2023 at 16:59, soyer <soyer@xxxxxx> wrote: > > > > Hi Ricardo > > > > On Wed, 2023-06-14 at 16:19 +0200, Ricardo Ribalda wrote: > > > [Now in plain text mode] > > > > > > Hi Gergo > > > > > > Doesn't your patch affect pan and tilt for all the cameras, not only > > > the BCC950? > > > > > Yes, it affects all cameras that support CT_PANTILT_RELATIVE_CONTROL. > > > > > Also it seems that 1 means that device does not support programmable > > > speed. Is that correct? > > > > > > ``` > > > The bPanSpeed field is used to specify the speed of the movement for > > > the Pan direction. A low > > > number indicates a slow speed and a high number indicates a higher > > > speed. The GET_MIN, > > > GET_MAX and GET_RES requests are used to retrieve the range and > > > resolution for this field. > > > The GET_DEF request is used to retrieve the default value for this > > > field. If the control does not > > > support speed control for the Pan control, it will return the value 1 > > > in this field for all these > > > requests. > > > ``` > > It seems to me that the module is compliant to the standard. It > returns 1 as GET_DEF because it does not support speed control. > > Maybe you should ignore the speed control instead of changing its default value? ( this is the standard I am refering to: 4.2.2.1.15 PanTilt (Relative) Control https://www.usb.org/document-library/video-class-v15-document-set ) > > > > > > > I started from the V4L2 control description. > > > > V4L2_CID_PAN_SPEED (integer) > > This control turns the camera horizontally at the specific speed. The > > unit is undefined. A positive value moves the camera to the right > > (clockwise when viewed from above), a negative value to the left. A > > value of zero stops the motion if one is in progress and has no effect > > otherwise. > > > > And this is why I thought that 1 is not a good default value, because > > it moves the camera. > > The other V4L2 controls have a default value that I can safely set the > > controls to. > > > > Are you using it to determine if the camera supports speed control? > > > > > When you program that value do you see any difference on the device? > > > What is max, min and res? > > > > > > > No, it works the same way. > > Only the default value changes (from 1 to 0) > > > > pan_speed 0x009a0920 (int) : min=-1 max=1 step=1 default=0 value=0 > > tilt_speed 0x009a0921 (int) : min=-1 max=1 step=1 default=0 value=0 > > > > > > > > > > > > Thanks! > > > > > > Regards! > > > > > > > > > > Thanks, > > Gergo > > > > > On Wed, 14 Jun 2023 at 15:13, Gergo Koteles <soyer@xxxxxx> wrote: > > > > > > > > The Logitech BCC950 incorrectly reports 1 (the max value) > > > > for the default values of V4L2_CID_PAN_SPEED, > > > > V4L2_CID_TILT_SPEED. > > > > > > > > This patch sets them to 0, which is the stop value. > > > > > > > > Previous discussion > > > > Link: > > > > https://lore.kernel.org/all/CAP_ceTy6XVmvTTAmvCp1YU2wxHwXqnarm69Yaz8K4FmpJqYxAg@xxxxxxxxxxxxxx/ > > > > > > > > Signed-off-by: Gergo Koteles <soyer@xxxxxx> > > > > --- > > > > drivers/media/usb/uvc/uvc_ctrl.c | 3 ++- > > > > 1 file changed, 2 insertions(+), 1 deletion(-) > > > > > > > > diff --git a/drivers/media/usb/uvc/uvc_ctrl.c > > > > b/drivers/media/usb/uvc/uvc_ctrl.c > > > > index 5e9d3da862dd..e131958c0930 100644 > > > > --- a/drivers/media/usb/uvc/uvc_ctrl.c > > > > +++ b/drivers/media/usb/uvc/uvc_ctrl.c > > > > @@ -444,9 +444,10 @@ static s32 uvc_ctrl_get_rel_speed(struct > > > > uvc_control_mapping *mapping, > > > > return -data[first+1]; > > > > case UVC_GET_MAX: > > > > case UVC_GET_RES: > > > > + return data[first+1]; > > > > case UVC_GET_DEF: > > > > default: > > > > - return data[first+1]; > > > > + return 0; > > > > } > > > > } > > > > > > > > > > > > base-commit: be9aac187433af6abba5fcc2e73d91d0794ba360 > > > > -- > > > > 2.40.1 > > > > > > > > > > > > > > > -- > Ricardo Ribalda -- Ricardo Ribalda
