Re: LCDC problem after commit 794d78fea51504bad3880d14f354a9847f318f25

["Rafael J. Wysocki" <rjw@sisk.pl>]

On Thursday, August 11, 2011, Laurent Pinchart wrote:
> Hi Magnus,
> 
> Sorry for the late reply.
> 
> On Tuesday 09 August 2011 12:48:44 Magnus Damm wrote:
> > On Mon, Aug 8, 2011 at 10:46 AM, Magnus Damm <magnus.damm@gmail.com> wrote:
> > > On Mon, Aug 8, 2011 at 8:25 AM, Rafael J. Wysocki <rjw@sisk.pl> wrote:
> > >> Unfortunately, after commit 794d78fea51504bad3880d14f354a9847f318f25
> > >> (drivers: sh: late disabling of clocks V2) the LCDC screen on my
> > >> Mackerel board goes off (late) during boot and cannot be turned on
> > >> by any way AFAICS (the backlight remains on, though).
> > >> 
> > >> It looks like the late disabling of clocks interacts badly with the
> > >> clock management done by PM domains.
> > > 
> > > This is most likely showing a so-far-not-handled clock dependency for
> > > the LCDC hardware. I'll have a look.
> > 
> > Further investigation shows that this only triggers when the MERAM is
> > enabled in the kernel configuration using CONFIG_FB_SH_MOBILE_MERAM=y.
> > So this seems more related to MERAM power management than LCDC.
> > 
> > Digging a bit deeper makes it clear that the sh_mobile_meram.c driver
> > in upstream doesn't seem to include any Runtime PM code. I recall
> > seeing various versions posted to the mailing list.
> > 
> > Laurent [CC], can you please provide us with a list of outstanding
> > LCDC/MERAM patches to make this work as expected? I realize there are
> > quite a few outstanding LCDC patches, but if possible please provide a
> > list of the bare minimum to make this work with 3.1-rc.
> 
> I've pushed my pending patches to http://git.linuxtv.org/pinchartl/fbdev.git 
> in the pm-domains branch. The first 19 patches have been picked from mailing 
> lists. Hopefully they're the latest versions that have been posted. The next 
> 11 patches shouldn't be required to enable runtime PM with the MERAM, but they 
> provide code cleanup and bug fixes.
> 
> Are Rafael' and Damian's patches ready for mainline ? If so, when will they be 
> pulled ? They're more than one month old, I was expecting them to hit v3.1-
> rc1. The backlog is growing, which makes collaboration more difficult.

Which of my patches are you referring to in particular?

Rafael