topic display_data lost on IMX53? in i.MX Processors

display_data lost on IMX53?

woutervh — Fri, 15 Feb 2013 11:22:02 GMT

We are outputting as RGB24 on the displayport.

However, we see that some LSB's gets lost (actually, not really lost, but getting replaced some of the MSB's)

With walking 1's, it looks like (measured with the scope)

I'm using the linux 2.6.35 kernel from release 9.11 (git). Anyone has any clue?

bit0 : 0x20 -> should be 0x01

bit1: 0x40 -> should be 0x02

bit2: 0x80 -> should be 0x04

bit3: 0x08

bit4: 0x10

bit5: 0x20

bit6: 0x40

bit7: 0x80

bit0 : 0x40-> should be 0x01

bit1: 0x80 -> should be 0x02

bit2: 0x04

bit3: 0x08

bit4: 0x10

bit5: 0x20

bit6: 0x40

bit7: 0x80

bit0 : 0x20 -> should be 0x01

bit1: 0x40 -> should be 0x02

bit2: 0x80 -> should be 0x04

bit3: 0x08

bit4: 0x10

bit5: 0x20

bit6: 0x40

bit7: 0x80

max_tsai — Mon, 25 Feb 2013 03:15:57 GMT

hi,

You may try to configure framebuffer with 32bpp.

You can add 'bpp=32' appending video_mode of bootup command.

you can refer to "mx53_start_linux.book" as the below.

---

4. For each of the devices connected with DI, provide a specific video mode in bootup command line

in this format: video=mxcdixfb:DI_pixel_format,

video_mode,bpp=bits_per_pixel_of_frame_buffer.

woutervh — Wed, 27 Feb 2013 13:07:57 GMT

thanks