[Letux-kernel] [PATCH pre-upstream RFC] media: omap3isp: Fix high idle current

Andreas Kemnade andreas at kemnade.info
Sat Jan 5 11:46:13 CET 2019


On Sat, 5 Jan 2019 11:33:23 +0100
"H. Nikolaus Schaller" <hns at goldelico.com> wrote:

> Hi Andreas,
> 
> > Am 05.01.2019 um 10:17 schrieb Andreas Kemnade <andreas at kemnade.info>:
> > 
> > On the GTA04, current consumption rose by about 30mA when the omap3_isp
> > module was loaded and the v4l device was not accessed and even no
> > camera attached.
> > Module removal fixed it again. Slowing down the removal process reveals
> > that nothing that calling isp_detach_iommu() is required to have low
> > current. So isp_attach/detach_iommu() to moved to the get()/put()
> > functions.  
> 
> To me there are one or two words missing to make the later sentences understandable.
> 
yes, there was some packet loss between /dev/brain and keyboard.
Noticed it after sending the email and will fix it before submitting
the patch to LKML.

> Maybe deepl.com en -> de and back to en?
> 
> Beim GTA04 stieg die Stromaufnahme um ca. 30mA, wenn das omap3_isp-Modul geladen wurde und auf das v4l-Gerät nicht zugegriffen und auch keine Kamera angeschlossen wurde.
> Die Entfernung des Moduls hat es wieder behoben. Die Verlangsamung des Entfernungsprozesses zeigt, dass nichts, was den Aufruf von isp_detach_iommu() erfordert, um einen niedrigen Strom zu haben. Also isp_attach/detach_iommu(), um zu den Funktionen get()/put() zu wechseln.
> 
> Übersetzt mit www.DeepL.com/Translator
> 
> and back to -> en
> 
> With the GTA04 the current consumption increased by about 30mA if the omap3_isp module was loaded and the v4l device was not accessed and no camera was connected.
> The removal of the module fixed it again. The slowing down of the removal process shows that nothing that requires isp_detach_iommu() to be called to have a low current. So isp_attach/detach_iommu() to switch to the get()/put() functions.
> 
> Translated with www.DeepL.com/Translator
> 
> Impressively good how it even works with () etc.
> 
> > 
> > Signed-off-by: Andreas Kemnade <andreas at kemnade.info>
> > ---
> > As I am not completely sure about current state of our camera stuff,
> > I am hesitating a bit here. I am doing now research of the actual state
> > of the camera in the letux kernel. Last time I tried, it was not soo stable.
> > But at least it fixes a problem in devices without camera.  
> 
> Yes, that is fine. I'll take it for letux-4.21-rc1. Should I also add to
> 4.20.1?
> 
I think that would be a good idea.

> The status is that the camera driver seems to work - but only once.
> I was able to get images through mplayer but when stopping and restarting
> I only got select timeouts and a green screen.

So at least the patch does not make things worse?

Regards,
Andreas
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