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AM4376: LCD driver issue

user5866140
Intellectual 300 points
Part Number: AM4376

Dear all,

I was debugging on AM437x LCD driver, here is my question:

I used 540*960 display, here is the parameter:

Here is the code:

but now we found it cannot work because of failed here:

Does it means hactive cannot be 540? How can we handle this?

Thanks.

BR,

Sheldon

  • 0
    TI__Guru**** 393215 points
    Hi,

    What Linux version is this?
  • 0 in reply to Biser Gatchev-XID
    Intellectual 300 points
    Hi Biser,

    The SDK version is 04.03.00.05, the kernel is 4.9.69.

    BR,
    Sam
  • 0 in reply to user5866140
    Prodigy 10 points
    if I change from drm to video, still use above lcd timings, when power up device, then appear this errors:

    [ 2.753749] omapdss APPLY error: SYNC_LOST on channel lcd, restarting the output with video overlays disabled
    [ 2.770662] omapdss APPLY error: SYNC_LOST on channel lcd, restarting the output with video overlays disabled
    [ 2.787721] omapdss APPLY error: SYNC_LOST on channel lcd, restarting the output with video overlays disabled
    [ 2.805719] omapdss APPLY error: SYNC_LOST on channel lcd, restarting the output with video overlays disabled
    [ 2.822137] omapdss APPLY error: SYNC_LOST on channel lcd, restarting the output with video overlays disabled
    [ 2.838967] omapdss APPLY error: SYNC_LOST on channel lcd, restarting the output with video overlays disabled
    [ 2.856950] omapdss APPLY error: SYNC_LOST on channel lcd, restarting the output with video overlays disabled
    [ 2.874235] omapdss APPLY error: SYNC_LOST on channel lcd, restarting the output with video overlays disabled

    [root@JC fb0]# ls /dev/fb
    fb0 fb1 fb2

    [root@JC fb0]# fbset

    mode "540x960-60"
    # D: 35.500 MHz, H: 58.197 kHz, V: 59.997 Hz
    geometry 540 960 540 960 16
    timings 28169 20 40 4 4 10 2
    accel false
    rgba 5/11,6/5,5/0,0/0
    endmode

    what these error meaning? how can i fix this?
  • 0
    TI__Mastermind 22806 points

    SamZ said:
    Does it means hactive cannot be 540? How can we handle this?

    Yes, the panel width has to be multiple of 8. The restriction comes from DSS IP. 

    Switching to FB driver won't fix the issue. We do not encourage using fbdev as that is no longer supported. Please stay with drm driver and work with panel width that is multiple of 8.