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[0/1] drm/panel: st7703: Fix resume of XBD599 panel

Message ID 20230212120830.46880-1-frank@oltmanns.dev (mailing list archive)
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Series drm/panel: st7703: Fix resume of XBD599 panel | expand

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Frank Oltmanns Feb. 12, 2023, 12:08 p.m. UTC 
This patch fixes flickering after resume from sleep on panel
xingbangda,xbd599 (e.g. used in PinePhone).

It was originally submitted by Ondrej Jirman in July 2020:
https://lore.kernel.org/all/20200716123753.3552425-1-megous@megous.com/

The original patchset contained two patches. This submission fixes the
patch that broke handling of the JH057N panel of the Purism Librem 5.

In essence, it does not change any behavior towards the JH057N panel,
but only affects the XDB599.

The patch is just a refactoring of Ondřej's original patch, that is
already used today by PinePhone distributions like PostmarketOS.

I was torn between using function pointers and just calling msleep()
with device specific delays. I decided to go with function pointers,
because my understanding is that calling msleep(0), which would be
required for waiting for the JH057N display to discharge, still results
in a delay. The empty function I used has no side effect on that panel.

The patch is based on drm-next.

Ondřej, since this is just a refactoring, I would gladly add your SoB,
if you wish so.

Thanks,
  Frank

Frank Oltmanns (1):
  drm/panel: st7703: Fix resume of XBD599 panel

 drivers/gpu/drm/panel/panel-sitronix-st7703.c | 40 ++++++++++++++++---
 1 file changed, 35 insertions(+), 5 deletions(-)