[Letux-kernel] Status of patch: drm/omap: work-around for omap3 display enable

Andreas Kemnade andreas at kemnade.info
Sat Aug 11 19:44:29 CEST 2018


Hi,

I noticed that there is still this patch in the letux gta04 kernel sources but it did
not appear in mainline:


Author: Tomi Valkeinen <tomi.valkeinen at ti.com>
Date:   Tue Jun 13 12:02:08 2017 +0300

    drm/omap: work-around for omap3 display enable
    
    Seems that on omap3 enabling a crtc without any planes causes a sync
    lost flood. This only happens on the first enable, and after that it
    works. This looks like an HW issue.
    
    It's unclear why this is happening or how to fix it, but as a quick
    work-around, this patch enables i734 errata work-around for omap2 and
    omap3 too. The errata work-around enables and disables the LCD output
    with a plane once when waking up the DSS IP, and it seems to resolve the
    omap3 problem too. It is unclear if omap2 has the same issue, but it
    probably has and the WA should have no side effects so it should be safe
    to enable on omap2 too.
    
    Signed-off-by: Tomi Valkeinen <tomi.valkeinen at ti.com>

A reordering of initialisation caused a regression I reported and as a result
this patch was created. So what is the fate of that patch? Is it superseded by
something better?

Regards,
Andreas
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