Whats missing in my new FB DRM driver... "No connectors reported connected with modes"?

[Xinliang Liu]

On 18 January 2016 at 22:45, Carlos Palminha <CARLOS.PALMINHA at synopsys.com>
wrote:

> I'm also getting a message from DRM saying can't find any crtc or
> sizes...i'm really missing something here.
> :(
>
> -- log --
> [drm] Initialized drm 1.1.0 20060810
> drm-arcpgu e0017000.pgu: No connectors reported connected with modes
> [drm] Cannot find any crtc or sizes - going 1024x768
> Console: switching to colour frame buffer device 128x48
> drm-arcpgu e0017000.pgu: fb0: frame buffer device
> [drm] Initialized drm-arcpgu 1.0.0 20151127 on minor 0
> -- log ---
>
> Any help?
>
> Regards,
> C.Palminha
>
>
> On 18-01-2016 14:32, Carlos Palminha wrote:
> > Hi Xinliang,
> >
> > My get_modes seems to be implemented as the rcar driver...
> > Probably still missing some init step?
> >
> > Regards,
> > C.Palminha
> >
> >
> > static int arcpgu_drm_connector_get_modes(struct drm_connector
> *connector)
> > {
> > struct drm_encoder_slave *slave;
> > const struct drm_encoder_slave_funcs *sfuncs;
> > struct arcpgu_drm_connector * con =
> > container_of(connector, struct arcpgu_drm_connector, connector);
> >
> > slave = con->encoder_slave;
> > if(slave == NULL) {
> > dev_err(connector->dev->dev,
> > "connector_get_modes: cannot find slave encoder for connector\n");
> > return 0;
> > }
> >
> > sfuncs = slave->slave_funcs;
> > if(sfuncs->get_modes == NULL){
> > return 0;
> > }
> >
> > return sfuncs->
> ​​
> get_modes(&slave->base,connector);
> > }
> >
>

​so, this will call adv7511 driver's ​
​
get_modes call back.
I wonder if the system boot up, it can get modes or not.
You can test it with the modetest. i.e. $ modetest -M DRM_DRIVER_NAME -c




> > On 31-12-2015 02:19, Xinliang Liu wrote:
> >>
> >>
> >> On 31 December 2015 at 02:46, Carlos Palminha
> >> <CARLOS.PALMINHA at synopsys.com <mailto:CARLOS.PALMINHA at synopsys.com>>
> wrote:
> >>
> >>     Hi guys,
> >>
> >>     I'm writing a DRM driver for a framebuffer embedded hardware that
> >>     uses an i2c encoder (adv7511), following the basic steps suggested
> >>     by Laurent in "anatomy of an embedded KMS driver":
> >>     https://www.youtube.com/watch?v=Ja8fM7rTae4
> >>
> >>     After initiliazing all kms, crtc, encoder, i2c, connector functions
> >>     and structures i'm calling drm_fbdev_cma_init to create a fbdev.
> >>
> >>     When booting i'm getting an error message saying "No connectors
> >>     reported connected with modes", but the driver init is ok and i can
> >>     find the /dev/dri/* and /dev/fb0 devices.
> >>
> >>     Any clue what i might be missing during the driver load?
> >>
> >>
> >> ​I think you should check on the 'get_modes'​ call back of adv7511
> >> driver. (Or, if possible show us the code.)
> >>
> >> Best,
> >> -xinliang
> >>
> >>
> >>     Thanks...
> >>
> >>     Regards,
> >>     C.Palminha
> >>
> >>     --- boot log snippet ---
> >>     [drm] Initialized drm 1.1.0 20060810
> >>     drm-arcpgu e0017000.pgu: No connectors reported connected with modes
> >>     [drm] Cannot find any crtc or sizes - going 1024x768
> >>     Console: switching to colour frame buffer device 128x48
> >>     drm-arcpgu e0017000.pgu: fb0:  frame buffer device
> >>     [drm] Initialized drm-arcpgu 1.0.0 20151127 on minor 0
> >>     --- boot log snippet ---
> >>     --
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> >>
> >>
>
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