On 06/11/17 16:04, H. Nikolaus Schaller wrote: > Hi, > some time after upgrading to 4.14-rc* I tried to boot the OpenPandora. > It turned out that the display panel has a bug - it only shows black/blue colors > instead of RGB. > > Some tests revealed that something happened between 4.13.0 and 4.14-rc1. > Here are screen photos: > > 4.13.0: http://download.goldelico.com/letux-kernel/files/thumb_DSC00812_1024.jpeg > 4.14-rc1: http://download.goldelico.com/letux-kernel/files/thumb_DSC00813_1024.jpeg > > But only for the OpenPandora. For the GTA04 it works. > > Well, the GTA04 is using a different panel "toppoly,td028ttec1" > and driver instead of "omapdss,tpo,td043mtea1". > [BTW: there seems to be some mixup of "compatible" schemes]. Omapdss boot-time code will prepend the compatibles with "omapdss,". The point is that the DTS is generic, but we'll still end up matching with the omapdss specific drivers. It's a temporary hack, and gets dropped as soon as we can use the common DRM panel model. > And there is also another difference between both: the Pandora 600MHz uses an > OMAP3530 while the GTA04 uses a DM3730. > > So something has become incompatible with *some* DPI panel drivers. > > After more than a week of bisecting in parallel to important other tasks > (it takes ca. 30-60 minutes for each run to add local patches, compile, > install, boot, check results - just to find some "[drm:omap_crtc_error_irq] *ERROR* lcd: errors: 00004000"), > I ended up with a specific result: > > > iMac:master hns$ git bisect bad > d178e034d5653edfbd16d0c71eeeed467e33c96f is the first bad commit > commit d178e034d5653edfbd16d0c71eeeed467e33c96f > Author: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx> > Date: Sat Aug 5 01:44:12 2017 +0300 > > drm: omapdrm: Move FEAT_DPI_USES_VDDS_DSI feature to dpi code > > The FEAT_DPI_USES_VDDS_DSI feature is specific to the DPI, move it from > the omap_dss_features structure to the dpi code. Well, the patch is simple enough... For some reason, the soc_device_match(dpi_soc_devices) call there doesn't match Pandora. I don't have a device up and running now, but I think the "family" string that it tries to match can also be seen somewhere under /proc, so you could perhaps find it and see if it actually is OMAP3530, which should be matched by the code. Tomi -- Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki. Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
