Re: [PATCH] drm/panel: himax-hx83102: restore MODE_LPM after sending disable cmds

[Icenowy Zheng]

在 2026-04-27一的 11:24 -0700，Doug Anderson写道：
> Hi,
> 
> On Sat, Apr 25, 2026 at 9:58 AM Icenowy Zheng
> <zhengxingda@xxxxxxxxxxx> wrote:
> > 
> > When preparing the panel, it seems that it always expects commands
> > to be
> > transferred in LP mode. However, the disable function removes the
> > MIPI_DSI_MODE_LPM flag, and no other function re-adds it.
> > 
> > As the unprepare function contains no DSI commands, re-adding the
> > flag
> > just after disabling the panel should be safe. Add the code re-
> > adding
> > the flag after the two commands for disabling the panel are sent.
> > 
> > This fixes screen unblanking (after blanking once) on
> > mt8188-geralt-ciri-sku1 device.
> > 
> > Cc: stable@xxxxxxxxxxxxxxx # 6.11+
> > Fixes: 0ef94554dc40 ("drm/panel: himax-hx83102: Break out as
> > separate driver")
> 
> This "Fixes" looks wrong. The bug was still there even before the
> driver was broken out. ...and it looks like the driver that this was
> broken out of (panel-boe-tv101wum-nl6.c) still has the same bug?

Yes, but I think the fix shouldn't be propagated to the other driver
because of the same reason with breaking out the original driver.

I have a device with a panel driven by the nl6 driver (device is
mt8183-kukui-kodama-sku32, panel is boe,tv101wum-n53), it shows the
same DSI timeout error message with ciri sku1, but the screen do come
back to life when unblanking. Maybe this fix should propagate there,
but I need more confirmation.

Thanks,
Icenowy

> 
> -Doug