Error while rotating LCD fb - detected fb_set_par error, error code: -22

Hi,

I am using a omap3530 <http://focus-webapps.ti.com/general/docs/sitesearch/searchdevice.tsp?partNumber=omap3530> based board. I am trying to rotate the LCD using*/sys/class/graphics/fb0/rotate*. The rotation works only for 0 degree and 270 degrees.

When trying to rotate for 90 or 180 degree it give error message *detected fb_set_par error, error code: -22 *and does not rotate.

The log output is below.*
*

/ # cat /proc/cmdline
omapdss.def_disp=lcd30 console=ttyS2,115200n8 root=/dev/mmcblk0p2 rw rootfstype=ext3
rootwait lpj=1949696 omapfb.rotate=1 omapfb.rotate_type=1
omap_vout.vid1_static_vrf
b_alloc=y omapfb.vrfb=y
/ # echo "0" > /sys/class/graphics/fb0/rotate
detected fb_set_par error, error code: -22
/ # echo "1" > /sys/class/graphics/fb0/rotate
/ # echo "2" > /sys/class/graphics/fb0/rotate
detected fb_set_par error, error code: -22
/ # echo "3" > /sys/class/graphics/fb0/rotate
/ # echo "1" > /sys/class/graphics/fb0/rotate

Can some one help me in solving this issue.

Regards,
HM Thalib

Quoted 28 lines · Mohamed Thalib H

Hi,

I am using a omap3530
<http://focus-webapps.ti.com/general/docs/sitesearch/searchdevice.tsp?partNumber=omap3530>
based board. I am trying to rotate the LCD using*/sys/class/graphics/fb0/rotate*. The rotation works only for 0 degree and 270 degrees.

When trying to rotate for 90 or 180 degree it give error message *detected fb_set_par error, error code: -22 *and does not rotate.

The log output is below.*
*

/ # cat /proc/cmdline
omapdss.def_disp=lcd30 console=ttyS2,115200n8 root=/dev/mmcblk0p2 rw rootfstype=ext3
rootwait lpj=1949696 omapfb.rotate=1 omapfb.rotate_type=1
omap_vout.vid1_static_vrf
b_alloc=y omapfb.vrfb=y
/ # echo "0" > /sys/class/graphics/fb0/rotate
detected fb_set_par error, error code: -22
/ # echo "1" > /sys/class/graphics/fb0/rotate
/ # echo "2" > /sys/class/graphics/fb0/rotate
detected fb_set_par error, error code: -22
/ # echo "3" > /sys/class/graphics/fb0/rotate
/ # echo "1" > /sys/class/graphics/fb0/rotate

Quoted 5 lines

Can some one help me in solving this issue.

Regards,
HM Thalib

For you info I am using 2.6.34 kernel. LCD size is 240x480

While tracing though the source code I have found out that in file *drivers/video/omap2/dss/overlay.c *function *dss_check_overlay() *it is checking if *dw < info->pos_x + outw *which is *(240 < 0 + 400)*

that is if my overlay width is smaller than screen size, if so return error.

Have any one faced the same scenario. If I am doing something wrong, Please let me know the correct steps to rotate the screen.