Linux/PROCESSOR-SDK-AM437X: Switching between HDMI and LCD at run time

vimal kumar56

Tool/software: Linux

Hi I am trying to switch between HDMI display and LCD panel display at run time in ti-processor-sdk-linux-am437x-evm-03.03.00.04. As we have two separate dtb for normal LCD and HDMI. Based on the "SEL_HDMIn" gpio we can switch between lcd and hdmi display. I am booting with am437x_gp-evm-hdmi.dtb with HDMI connected and getting the display correctly.

Now When i am toggling the "SEL_HDMIn" gpio then display is shifting to LCD panel but whole display is shifted towads left side and I am not getting the full display.

It seems the frame buffer is registered for HDMI display and all the settings for frame buffer using "fbset" is reflecting on HDMI display only not on LCD display.

When I am configuring both display as lcd-display0 and HDMI->display1 then Graphics driver is not loading and I am not getting display on any of the display device.

The graphics failed error is:

Initializing the graphics driver ...
PVR:(Error): OpenServices: drmOpen failed [123, /pvr_bridge_u.c]
PVR:(Error): PVRSRVInitSrvConnect: PVRSRVConnect failed [2572, /bridged_pvr_glue.c]
PVR:(Error): SrvInit: PVRSRVInitSrvConnect failed (4) [37, /srvinit.c]
PVR:(Error): main: SrvInit failed (4) [47, /pvrsrvinit.c]

Any help how i can configure both display devices at same time.

over 9 years ago

0 Biser Gatchev-XID over 9 years ago

TI__Guru**** 393215 points

The software team have been notified. They will respond here.

0 vimal kumar56 over 9 years ago in reply to Biser Gatchev-XID

Intellectual 560 points

Any update on this. If it is possible or not to switch between LCD and HDMI on am437x-gp-evm without rebooting.

0 vimal kumar56 over 9 years ago

Intellectual 560 points

Now I am configuring the OMAP2_DSS, connector_hdmi, and connector_dvi etc. module as loadable module and loading those module after booting the board.
Then if am loading the connector_hdmi with omapdss and encoder-sii9022 modules HDMI comes up, and If I am loading panel_dvi with omapdss module then LCD comes up but I am not able to switch in between.

It is because i am not able to unload module ones loaded either lcd module or hdmi module.
it throwing error like its being used but "lsmod" doesn't giving any name as which is using those module.

here is some part of output of lsmod :

Module Size Used by
panel_dpi 3355 1
omapdss 214826 1
ipv6 305276 24
cryptodev 33576 0
rpmsg_pru 4498 0
wl18xx 92343 0
wlcore 184176 1 wl18xx
mac80211 414081 2 wl18xx,wlcore
virtio_rpmsg_bus 11662 1 rpmsg_pru
cfg80211 222689 3 mac80211,wl18xx,wlcore
evdev 10085 0
........... ....... .....

Any possibility of switching between the LCD and HDMI display without rebooting on am437x.
Either by loading unloading the respective drivers or any other if possible?

Thanks.

0 Biser Gatchev-XID over 9 years ago in reply to vimal kumar56

TI__Guru**** 393215 points

The DSS expert is out of office this week. We will try to provide feedback as early as possible next week.

0 Manisha Agrawal over 9 years ago in reply to vimal kumar56

TI__Mastermind 22946 points

The display driver doesn't support run time switching between LCD and HDMI.

0 vimal kumar56 over 9 years ago in reply to Manisha Agrawal

Intellectual 560 points

Hi thanks for the reply. This support is not there at present but there is any way we can integrate it by changing the way driver getting registered or any other.

Is it possible to bring in runtime switching support for this processor??

0 Manisha Agrawal over 9 years ago in reply to vimal kumar56

TI__Mastermind 22946 points

What kind of functionality are you looking for? What's the use case?

Processors

Processors forum

Linux/PROCESSOR-SDK-AM437X: Switching between HDMI and LCD at run time