Kernel Newbies archive on lore.kernel.org
 help / color / Atom feed
* [IMX] [DRM]: suspend/resume support
@ 2019-06-17 13:49 Pintu Agarwal
  2019-06-18  7:01 ` Oliver Neukum
  2019-06-18 14:02 ` Fabio Estevam
  0 siblings, 2 replies; 19+ messages in thread
From: Pintu Agarwal @ 2019-06-17 13:49 UTC (permalink / raw)
  To: open list, linux-arm-kernel, Kernelnewbies, linux-pm

Hi All,

I am trying to implement suspend/resume functionality to to imx-hdmi driver:
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tree/drivers/gpu/drm/imx/dw_hdmi-imx.c?h=v4.9.181

So, I need some help about this.
I logged the request in imx community, but it seems they are not responding.
Firstly I expect nxp community members to support (if anybody here).
Otherwise, I guess, people who are experts here and have prior
experience in implementing suspend/resume for their drivers, should be
able to give me some guidance.

Currently, I am trying to understand what needs to be taken care
during suspend/resume.
With some reference, I figured out that hdmi power off/on needs to be
done during suspend/resume.
But after resume, system is hanging.
It seems like vblank events are not getting triggered after the resume.
May be irq remains disabled after resume, I need to figure out some
way to enable the all the irqs again.

Even if I try to install hdmi driver as a dynamic loadable module,
still I get the same issue.

So, I wonder, what is the right way to handle suspend/resume for any driver.
Some clue/reference should help me to keep going...


Regards,
Pintu

_______________________________________________
Kernelnewbies mailing list
Kernelnewbies@kernelnewbies.org
https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies

^ permalink raw reply	[flat|nested] 19+ messages in thread

end of thread, back to index

Thread overview: 19+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-06-17 13:49 [IMX] [DRM]: suspend/resume support Pintu Agarwal
2019-06-18  7:01 ` Oliver Neukum
2019-06-18 14:02 ` Fabio Estevam
2019-06-18 14:45   ` Pintu Agarwal
2019-06-18 15:09     ` Fabio Estevam
2019-06-19 13:33       ` Pintu Agarwal
2019-06-19 13:44         ` Fabio Estevam
2019-06-19 15:04           ` Pintu Agarwal
2019-06-19 15:11             ` Fabio Estevam
2019-06-19 15:29               ` Pintu Agarwal
2019-06-21 15:12                 ` Pintu Agarwal
2019-06-21 15:40                   ` Fabio Estevam
2019-06-22  8:13                     ` Pintu Agarwal
2019-07-01 14:25                       ` Pintu Agarwal
2019-07-11 15:29                         ` [IMX] [DRM]: help in analyzing clock_summary rate difference Pintu Agarwal
2019-06-19 15:04         ` [IMX] [DRM]: suspend/resume support Greg KH
2019-06-19 15:17           ` Pintu Agarwal
2019-06-19 16:26             ` Valdis Klētnieks
2019-06-21 15:04               ` Pintu Agarwal

Kernel Newbies archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/kernelnewbies/0 kernelnewbies/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 kernelnewbies kernelnewbies/ https://lore.kernel.org/kernelnewbies \
		kernelnewbies@kernelnewbies.org kernelnewbies@archiver.kernel.org
	public-inbox-index kernelnewbies

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernelnewbies.kernelnewbies


AGPL code for this site: git clone https://public-inbox.org/ public-inbox