On 20/11/2018 05:05, CK Hu wrote: > Hi, Matthias: > > On Mon, 2018-11-19 at 10:26 +0100, Matthias Brugger wrote: >> >> On 19/11/2018 06:38, CK Hu wrote: >>> Hi, Matthias: >>> >>> On Fri, 2018-11-16 at 13:54 +0100, matthias.bgg@xxxxxxxxxx wrote: >>>> From: Matthias Brugger <mbrugger@xxxxxxxx> >>>> >>>> It can happen that the mmsys clock drivers aren't probed before the >>>> platform driver gets invoked. The platform driver used to print a warning >>>> that the driver failed to get the clocks. Omit this error on >>>> the defered probe path. >>> >>> This patch looks good to me, but you have not modified the sub driver in >>> HDMI path. We could let HDMI path print the warning and someone send >>> another patch later, or you modify for HDMI path in this patch. >> >> Sure, I'll add this in v6. After inspecting the code, I think we will need to >> also check for not initialized clocks in mtk_mdp_comp_init, as the driver for >> now does not even check if the clocks are present. What do you think? > > Yes, we do really need to consider mdp driver because mmsys clock > include mdp clock. You remind me that mmsys control 4 major function: > drm routing, drm clock, mdp routing, and mdp clock. Your design let the > mmsys device as drm device (control drm routing) and create a sub device > as clock device (control drm clock, mdp clock). If one day mdp device > (may need control drm routing) need to control the register of mdp > routing, would mdp device be a sub device? Or we need not to consider > this because it need not to access mmsys register now? > I think we should for now concentrate to fix the clock probing issue. If in the future we will need to access drm routing from the mdp device, we can have a look into this. Sounds good? Regards, Matthias
