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    SubjectRe: [PATCH 8/8] ARM / shmobile: Support for I/O PM domains for SH7372 (v5)
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    Hi Magnus,

    On Wednesday 15 June 2011 16:17:15 Magnus Damm wrote:
    > On Wed, Jun 15, 2011 at 6:16 AM, Rafael J. Wysocki <rjw@sisk.pl> wrote:
    > > On Tuesday, June 14, 2011, Magnus Damm wrote:
    > >> On Sun, Jun 12, 2011 at 5:40 AM, Rafael J. Wysocki <rjw@sisk.pl> wrote:
    > >> > From: Rafael J. Wysocki <rjw@sisk.pl>
    > >> >
    > >> > Use the generic power domains support introduced by the previous
    > >> > patch to implement support for power domains on SH7372.
    > >> >
    > >> > Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
    > >> > ---
    > >>
    > >> Thanks for your work on this. I just tried this on my Mackerel board,
    > >> but I can't seem to get the pd_power_up() and pd_power_down()
    > >> callbacks to be executed. It is probably a misconfiguration from my
    > >> side.
    > >
    > > They trigger for me e.g. after doing
    > >
    > > # echo 3 > /sys/devices/platform/sh_mobile_lcdc_fb.0/graphics/fb0/blank
    > >
    > > Attached is the .config I've been using.
    >
    > Thanks, I can trigger using sysfs and your kernel configuration.
    >
    > However, I assumed it also would work when the sceen saver kicked in.
    > I recall it being fbcon that controls the screen save, perhaps
    > something else. So just wait a bit and see if you also can reproduce
    > it. The console gets black but the power is still on...

    That's because, by default, the VT layer will use FB_BLANK_NORMAL mode when
    blanking the console. Switching that to FB_BLANK_VSYNC_SUSPEND,
    FB_BLANK_HSYNC_SUSPEND or FB_BLANK_POWERDOWN with TIOCLINUX(TIOC_SETVESABLANK)
    results in the device being runtime-suspended when the console is blanked.

    > Also forcing to go back to powered-on state (see below) doesn't work that
    > well: # echo 0 >
    > /sys/devices/platform/sh_mobile_lcdc_fb.0/graphics/fb0/blank
    >
    > It looks like we loose the panning information somehow. Most likely a LCDC
    > driver bug. Unless the driver callbacks are not being invoked as expected.
    >
    > Also, there is garbage in on the screen if FB_SH_MOBILE_MERAM is
    > enabled. The MERAM hardware is a 1.5 MiB memory block that can be used
    > as a LCD cache. It sits in the same hardware power domain as the
    > LCDCs. I don't think the MERAM software supports power down
    > unfortunately. Disabling MERAM support removes the garbage on the
    > screen.

    --
    Regards,

    Laurent Pinchart


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