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

[Carlos Palminha]

when i boot the kernel and connect the HDMI cable after booting i can retrieve 4 modes... :)

if i boot linux with the HDMI cable inserted the kernel hangs.
Possible relation with HPD?

Regards,
C.Palminha

# modetest -M drm-arcpgu -c
Connectors:
id      encoder status          type    size (mm)       modes   encoders
21      0       connected       HDMI-A  0x0             4       20
  modes:
        name refresh (Hz) hdisp hss hse htot vdisp vss vse vtot)
  800x600 60 800 840 968 1056 600 601 605 628 flags: phsync, pvsync; type: driver
  800x600 56 800 824 896 1024 600 601 603 625 flags: phsync, pvsync; type: driver
  848x480 60 848 864 976 1088 480 486 494 517 flags: phsync, pvsync; type: driver
  640x480 60 640 656 752 800 480 490 492 525 flags: nhsync, nvsync; type: driver
  props:
        1 EDID:
                flags: immutable blob
                blobs:

                value:
        2 DPMS:
                flags: enum
                enums: On=0 Standby=1 Suspend=2 Off=3
                value: 0

#

On 19-01-2016 16:03, Carlos Palminha wrote:
> Hi Xiang,
> 
> Its returning 0 modes... :(
> 
> Regards,
> C.Palminha
> 
> # modetest -M drm-arcpgu -c
> Connectors:
> id      encoder status          type    size (mm)       modes   encoders
> 21      0       disconnected    HDMI-A  0x0             0       20
>   props:
>         1 EDID:
>                 flags: immutable blob
>                 blobs:
> 
>                 value:
>         2 DPMS:
>                 flags: enum
>                 enums: On=0 Standby=1 Suspend=2 Off=3
>                 value: 0
> 
> #
> 
> On 19-01-2016 03:38, Xinliang Liu wrote:
>> 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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>>>
>>