On 2014년 05월 26일 14:39, Naveen Krishna Ch wrote: > Hello Everyone, > > On 21 May 2014 21:16, Thierry Reding <thierry.reding@xxxxxxxxx> wrote: >> On Wed, May 14, 2014 at 05:09:45PM +0530, Naveen Krishna Chatradhi wrote: >>> exynos_drm_init() does probing of various drivers like dp_panel, >>> hdmi, fimd, mixer, etc in an order and finally binds them together. >>> >>> Some of the drm devices (Eg: dp_panel) try to do regulator_get() >>> and enable few supplies during their probe. >>> Chances are that, these devices may get probed before the respective >>> supply/PMIC is hooked. In such cases, dp_panel would continue with >>> "dummy regulator". Which is not what the system wants. >>> >>> Lets give the core connectivity and regulators modules some time >>> to hookup the supplies before Exynos DRM devices comes into picture. >>> >>> Signed-off-by: Naveen Krishna Chatradhi <ch.naveen@xxxxxxxxxxx> >>> --- >>> This change is proposed after >>> 1. Discussing with I2C/SPI & DMA subsystem maintainers and Others >>> @ https://lkml.org/lkml/2014/5/9/333 >>> Trying to change the I2C, SPI and DMA drivers as subsys_initcall() >>> Which was strictly opposed, as a flaw was found in DRM subsystem. >>> >>> 2. -EPROBE_DEFER won't work well with the current sequency of >>> platform_driver_register()s in exynos_drm_init() >> >> Then this is the problem that you need to fix. If the driver doesn't >> handle -EPROBE_DEFER properly then that means the driver is broken. No >> amount of initcall ordering can fix this for you. > > We seem to have a problem with the probe sequencing and usage of _EPROBE_DEFER > in DRM. Component way of registration doesnt seem to fix everything. > > Inki Dae, > Is there any discussion or approach underway. > Anyone working on this. Hi, I have just posted a patch series, [PATCH 0/2] drm/exynos: consider deferred probe case, to resolve that issue. With this, it wouldn't need your patch anymore. Thanks, Inki Dae >> >> Thierry > > > _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
