[TuxOnIce-devel] [RFC PATCH] Current status, suspend-to-disk support on ARM

[Matt Hsu]

>
>
> The last thing here in my setup that's obviously not correctly suspending /
> resuming is the OMAP display driver; I'm not the only one with that problem,
> Matt's previous report:
>
> http://blog.gmane.org/gmane.linux.swsusp.devel/month=20101201
>
> has the same thing, "omapdss DISPC error: SYNC_LOST, disabling LCD".
>
>
>     Hi FrankH,

    Above issue could be resolved by:

   - CONFIG_FB_OMAP2_FORCE_AUTO_UPDATE=y
   - the following patch

diff --git a/drivers/video/omap2/dss/dispc.c
b/drivers/video/omap2/dss/dispc.c
index 8b3ac80..a188732 100644
--- a/drivers/video/omap2/dss/dispc.c
+++ b/drivers/video/omap2/dss/dispc.c
@@ -2784,7 +2784,6 @@ static void dispc_error_worker(struct work_struct
*work)
                bool enable = false;

                DSSERR("SYNC_LOST, disabling LCD\n");

                for (i = 0; i < omap_dss_get_num_overlay_managers(); ++i) {
                        struct omap_overlay_manager *mgr;
                        mgr = omap_dss_get_overlay_manager(i);
@@ -2815,6 +2814,9 @@ static void dispc_error_worker(struct work_struct
*work)
                        if (enable)
                                manager->device->enable(manager->device);
                }
+
+               dispc_enable_lcd_out(false);
+               dispc_enable_lcd_out(true);

     Although this patch is somehow nasty, but it work anyway.

- Matt
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