staging: fbtft: fb_st7789v: reset display before initialization
In rare cases the display is flipped or mirrored. This was observed more
often in a low temperature environment. A clean reset on init_display()
should help to get registers in a sane state.
Signed-off-by: Oliver Graute <[email protected]>
---
drivers/staging/fbtft/fb_st7789v.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/staging/fbtft/fb_st7789v.c b/drivers/staging/fbtft/fb_st7789v.c
index 3a280cc1892c..0a2dbed9ffc7 100644
--- a/drivers/staging/fbtft/fb_st7789v.c
+++ b/drivers/staging/fbtft/fb_st7789v.c
@@ -82,6 +82,8 @@ enum st7789v_command {
{
int rc;
+ par->fbtftops.reset(par);
+
rc = init_tearing_effect_line(par);
if (rc)
return rc;
--
2.17.1
On Fri, Aug 13, 2021 at 08:25:10AM +0200, Oliver Graute wrote:
> staging: fbtft: fb_st7789v: reset display before initialization
What is this line here, and why is this not your subject line instead?
>
> In rare cases the display is flipped or mirrored. This was observed more
> often in a low temperature environment. A clean reset on init_display()
> should help to get registers in a sane state.
>
> Signed-off-by: Oliver Graute <[email protected]>
What commit does this fix?
thanks,
greg k-h
On 13/08/21, Greg KH wrote:
> On Fri, Aug 13, 2021 at 08:25:10AM +0200, Oliver Graute wrote:
> > staging: fbtft: fb_st7789v: reset display before initialization
>
> What is this line here, and why is this not your subject line instead?
I'll put the line as subject instead.
> > In rare cases the display is flipped or mirrored. This was observed more
> > often in a low temperature environment. A clean reset on init_display()
> > should help to get registers in a sane state.
> >
> > Signed-off-by: Oliver Graute <[email protected]>
>
> What commit does this fix?
this is a fix for a rare behavior of the fb_st7789v display. Not a
bugfix for a specific commit.
Best regards,
Oliver
On Fri, Aug 13, 2021 at 02:54:30PM +0200, Oliver Graute wrote:
> On 13/08/21, Greg KH wrote:
> > On Fri, Aug 13, 2021 at 08:25:10AM +0200, Oliver Graute wrote:
> > > staging: fbtft: fb_st7789v: reset display before initialization
> >
> > What is this line here, and why is this not your subject line instead?
>
> I'll put the line as subject instead.
>
> > > In rare cases the display is flipped or mirrored. This was observed more
> > > often in a low temperature environment. A clean reset on init_display()
> > > should help to get registers in a sane state.
> > >
> > > Signed-off-by: Oliver Graute <[email protected]>
> >
> > What commit does this fix?
>
> this is a fix for a rare behavior of the fb_st7789v display. Not a
> bugfix for a specific commit.
So if it has always been broken, list the commit where the code was
added to the kernel, as this should be backported to the stable kernels,
right?
thanks,
greg k-h
On 13/08/21, Greg KH wrote:
> On Fri, Aug 13, 2021 at 02:54:30PM +0200, Oliver Graute wrote:
> > On 13/08/21, Greg KH wrote:
> > > On Fri, Aug 13, 2021 at 08:25:10AM +0200, Oliver Graute wrote:
> > > > staging: fbtft: fb_st7789v: reset display before initialization
> > >
> > > What is this line here, and why is this not your subject line instead?
> >
> > I'll put the line as subject instead.
> >
> > > > In rare cases the display is flipped or mirrored. This was observed more
> > > > often in a low temperature environment. A clean reset on init_display()
> > > > should help to get registers in a sane state.
> > > >
> > > > Signed-off-by: Oliver Graute <[email protected]>
> > >
> > > What commit does this fix?
> >
> > this is a fix for a rare behavior of the fb_st7789v display. Not a
> > bugfix for a specific commit.
>
> So if it has always been broken, list the commit where the code was
> added to the kernel, as this should be backported to the stable kernels,
> right?
ok thx, will list the commit and add [email protected] to cc
thx,
Oliver