Linux/AM3358: Display rotation

Thank you Biser for the response.

I did try by changing the value to /sys/class/graphics/fbcon/rotate - Observation is that, I can see the penguin icon that appears during boot up. By changing the rotate value, I can see the position of icon moves around. But I wonder, why not my application. Any thoughts?

Hi Kumara,

If you are using AM335x part with SGX on it then SGX can be used for rotation using openGL programming. I do not have any reference example application to share for same.

Alternately you can try weston windows manager (supported on Processor SDK) but it consume CPU cycle.

To achieve 180 degree rotation using Weston, configure /etc/weston.ini file as below

[output]
name=<connector name ex: HDMI-A-1>
transform=180

you can get connector name running modetest application.

If you are using TI GP EVM and Processor SDK Linux, SGX should be on by default.

Just enabling SGX is not going to impact the performance on the system. Using SGX for rotation compared to doing it in ARM, certainly it will be less MHz consumed by ARM when the rotation is done on SGX.

SGX performance number is currently available for AM57x only. You can refer to the benchmarking numbers here -

Also refer to below link -

To clarify (on Kumara's behalf), we are using ti-sdk-am335x-evm-07.00.00.00 and the QT that was bundled (QT 4.8).  We ran the gfx_check.sh and it appears pvr is not loaded.

Here is the result

WSEGL settings
[default]
WindowSystem=libpvrPVR2D_FRONTWSEGL.so.1
------
ARM CPU information
processor       : 0
model name      : ARMv7 Processor rev 2 (v7l)
Features        : swp half thumb fastmult vfp edsp thumbee neon vfpv3 tls vfpd32
CPU implementer : 0x41
CPU architecture: 7
CPU variant     : 0x3
CPU part        : 0xc08
CPU revision    : 2

Hardware        : Generic AM33XX (Flattened Device Tree)
Revision        : 0000
Serial          : 0000000000000000
------
SGX driver information
cat: can't open '/proc/pvr/version': No such file or directory
------
Framebuffer settings

mode "640x480-60"
    # D: 25.000 MHz, H: 31.250 kHz, V: 59.524 Hz
    geometry 640 480 640 960 32
    timings 40000 114 16 32 10 30 3
    rgba 8/16,8/8,8/0,8/24
endmode

Frame buffer device information:
    Name        : DA8xx FB Drv
    Address     : 0x8d900000
    Size        : 2457600
    Type        : PACKED PIXELS
    Visual      : TRUECOLOR
    XPanStep    : 0
    YPanStep    : 1
    YWrapStep   : 0
    LineLength  : 2560
    Accelerator : No
------
Rotation settings
0
------
Kernel Module information
Module                  Size  Used by
stkChk                  2774  0
cmv                     5825  0
apm                     3660  0
usb_f_ecm               6963  1
g_ether                 1783  0
usb_f_rndis             7030  2 g_ether
u_rndis                 9846  1 usb_f_rndis
libcomposite           30114  3 usb_f_ecm,usb_f_rndis,g_ether
u_ether                10080  3 usb_f_ecm,usb_f_rndis,g_ether
cfg80211              163054  0
musb_dsps               6511  0
musb_hdrc              52356  1 musb_dsps
snd_soc_audtel          2919  1
snd_soc_cpld            2627  0
snd_soc_davinci_mcasp     9604  4
snd_soc_gcpld           1435  1
snd_soc_davinci         5438  1 snd_soc_davinci_mcasp
snd_soc_gaudtel         1473  1
snd_soc_core           99125  6 snd_soc_davinci_mcasp,snd_soc_cpld,snd_soc_davinci,snd_soc_gcpld,snd_soc_gaudtel,snd_soc_audtel
serial9bitdriver       37002  1
regmap_spi              1469  1 snd_soc_core
musb_am335x             1199  0
snd_pcm                62968  4 snd_soc_core,snd_soc_davinci,snd_soc_audtel
snd_timer              15720  1 snd_pcm
snd_page_alloc          4843  1 snd_pcm
snd_compress            7119  1 snd_soc_core
snd                    37391  5 snd_soc_core,snd_timer,snd_pcm,snd_compress
soundcore                688  1 snd
------
Boot settings
console=ttyO0,115200n8 root=/dev/mmcblk0p2 rootfstype=ext3 rw rootwait ip=off lpj=3590144 video=/dev/fb0:480x640@60 fbcon=rotate:1
------
Linux Kernel version
Linux Node00b01973d728 3.12.10-Edwards.00.00.20-ti2013.12.01 #2 Wed Aug 16 11:06:01 EDT 2017 armv7l GNU/Linux

What do we need to do it enable the SGX?

We don't support that SDK version. It's too old. I won't be able to comment on it.

It was our understanding that the gfx was enabled by default on the 7.00.00 SDK but for some reason it doesn't seem to be in ours. We don't recall disabling it so we are asking for assistance to figure out why.

Perhaps you have legacy documentation for the 7.00.00 that can you share.

Hi Peter,

Sorry, there is no access to legacy documentation.

Thank you Manisha for the answers! Thank you Pete for taking the answers going out to Manisha!

Manisha,
If at all we need support on TI SDK 7, what would be the right approach? I ask this because, I am not sure that if we can update the TI SDK sooner. Down the line, we may plan for it, but not for now. However, we will need to get the solutions for the problems to keep going.

Please let us know.

Thank you,
Kumara