hi...
i just found that its blocking waiting for console_lock... @vineet, alexey: i think that console_lock is architecture dependent right? Do you know any issue with console_lock for ARC?
On 21-01-2016 18:09, Carlos Palminha wrote:
i made some progress in identifying the issue... When my driver calls drm_fb_helper_initial_config it seems DRM blocks waiting for register_framebuffer to return. The sequence is drm_fb_helper_initial_config->drm_fb_helper_single_fb_probe->register_framebuffer.
Its strange because register_framebuffer function is just a mutex around do_register_framebuffer.
Any clue?!
On 20-01-2016 01:24, Xinliang Liu wrote:
On 20 January 2016 at 00:52, Carlos Palminha CARLOS.PALMINHA@synopsys.com wrote:
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.
What's the hang kernel log. Is it a oops?
Possible relation with HPD?
Yes, I think there might be something wrong with the HPD interrupt or the EDID ready interrupt. I do meet the similar issue before when I using the upstream adv7511 driver to enable adv7533. I found that the HPD and EDID interrupt is not reliable. In order to get modes stably, I have to add some delay like bellow: -- --- a/drivers/gpu/drm/i2c/adv7511.c +++ b/drivers/gpu/drm/i2c/adv7511.c @@ -657,6 +657,8 @@ static int adv7511_get_modes(struct adv7511 *adv7511, regmap_update_bits(adv7511->regmap, ADV7511_REG_POWER, ADV7511_POWER_POWER_DOWN, 0); adv7511->current_edid_segment = -1;
/* wait some time for edid is ready */msleep(200); } edid = drm_do_get_edid(connector, adv7511_get_edid_block, adv7511);--
Best, -xinliang
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@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@synopsys.com mailto:CARLOS.PALMINHA@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 --- >> -- >> To unsubscribe from this list: send the line "unsubscribe >> linux-fbdev" in >> the body of a message to majordomo@vger.kernel.org >> mailto:majordomo@vger.kernel.org >> More majordomo info at http://vger.kernel.org/majordomo-info.html >> >>