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

[Mohamed Thalib H <hmthalib@gmail.com>]

On Friday 27 May 2011 03:40 PM, Mohamed Thalib H wrote:
> 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
>

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.