AM335x LCD Framebuffer problem

Hi,

Please tune below menuconfig option

Symbol: FB_DA8XX_CONSISTENT_DMA_SIZE [=5]       

 Type  : intege
   Range : [1 14]
   Prompt: Consistent DMA memory size (MB)  

    Defined at drivers/video/Kconfig:2241 

 Depends on: HAS_IOMEM [=y] && FB_DA8XX [=y] && MACH_AM335XEVM [=y] 
    Location: 
      -> Device Drivers
         -> Graphics support  
           -> Support for frame buffer devices (FB [=y]) 
             -> DA8xx/OMAP-L1xx Framebuffer support (FB_DA8XX [=y]) 

Thanks,

Prakash

Hi Prakash,

Thanks for your reply.

My problem through modify "FB_DA8XX_CONSISTENT_DMA_SIZE".

I got same error message from Linux kernel.

Regards

Spall

Hi Spall,

Did you try changing it to 8? It can take values up to 14. By the way how much memory you are requesting via dma_alloc_coherent?

Thanks,

Prakash

Hi Prakash,

Yes, I have changing FB_DA8XX_CONSISTENT_DMA_SIZE[=8].

Because of my project LCD resolution is 1024 x 768 x 32(bpp) x 2(dual_frame), so I need 6291456 byte. 

Thank for your help.

Spall

Hi Spall,

I am facing with the same problem, when allocating more then 4MB of coherent memory for the frame buffer. Did you maybe solved the problem. My current solution is to use only 16 bits per pixel, but it would be nice to have higher dynamic. I have set even set FB_DA8XX_CONSISTENT_DMA_SIZE[=16], but without any luck.

I'm also havim minor problem with the Blue and Red color, as they are swapped. We have double check the interconnects between AM335x and the PHY. Do you maybe have the same problem on your design.

Thank you for your help.

With kind regards,

Dejan

Hi Spall,

Thank you very much for sharing that fix. Currentlly I am out of the office, but I will try it as first think in Monday mornig. Did you maybe have expiranced swapped color scheme? We have double check our schematics , considering the errata of the AM3359 processor, but we have red and blue colors swapped, while the green one is fine.

Thank you. I will give you a feedback in Monday.

Regards,

Dejan

Hi Spall,

Thank you for your suggestion, which lead me to the sulution, which works for me.

Actually, in my config file from some reason was constantlly present CONFIG_FORCE_MAX_ZONEORDER=11, which overrides "#define MAX_ORDER". Even if I had putted it in comment as follows "# CONFIG_FORCE_MAX_ZONEORDER is not set", and soon as I issued make command it has automatically set back to CONFIG_FORCE_MAX_ZONEORDER=11. Therefore, I have to update its description in Kconfig file, as foillow:

config FORCE_MAX_ZONEORDER
 int "Maximum zone order"
 depends on ARCH_SHMOBILE || SOC_OMAPAM33XX
 range 11 64 if ARCH_SHMOBILE || SOC_OMAPAM33XX
 default "9" if SA1111
 default "11"
 help
   The kernel memory allocator divides physically contiguous memory
   blocks into "zones", where each zone is a power of two number of
   pages.  This option selects the largest power of two that the kernel
   keeps in the memory allocator.  If you need to allocate very large
   blocks of physically contiguous memory, then you may need to
   increase this value.

   This config option is actually maximum order plus one. For example,
   a value of 11 means that the largest free memory block is 2^10 pages.

Ahmet, thank you for that info, but as I said, we have considered the device errata. However, now when the bits per pixel are set to 32 bits, the colors are just working fine. Just for info, we are using on LCD controller 24-bit data output.

Thank you all for helping me solve this problem.

Best regards,

Dejan

Hi Dejan,

made the changes you suggested and now I can allocate 8MB and get higher resolution. Have you submitted a patch? If not I can also make this and would like to have your SoB.

Yegor

Hi Yegor,

I’m glad it helped you up.

Actually I have not uploaded any patch for this video issue. We have developed a new board using AM335X processor, with a lot of supported peripherals. Beside this, we have adapted Linux to support new MACHINE_TYPE, along other updates to support our board’s features.

Therefore, I am interested that our kernel updates would come to the TI mainline. Would you be able to help me on this way? However, I can share my SoC patches, but in week or two time, because I have some deadlines to catch in new future.

Best regards,

Dejan

What kernel are you using? From what git repo? Have you used device tree?

Yegor

I have linux-3.2-psp04.06.00.07 from LINUXEZSDK-AM335X. Do you see any options to get my patches to the mainline?

Dejan

Have you read my private message? See your "Conversations".

I've prepared the patch and just need your e-mail for SoB.

AM3359 24bit 1024*768 LCD  “LCD: kmalloc for frame buffer failed”?
 [    1.308959]  da8xx_lcdc.0: alias fck already exists
 [    1.314666] da8xx_lcdc da8xx_lcdc.0: GLCD: Found TFC_S9700RTWV35TR_01B panel
 [    1.323120] ------------[ cut here ]------------ [    1.328033] WARNING: at mm/page_alloc.c:2110 __alloc_pages_nodemask+0x458/0x62c()
 [    1.335906] Modules linked in:
 [    1.339141] Backtrace:
 [    1.341735] [<c001803c>] (dump_backtrace+0x0/0x10c) from [<c04d5438>] (dump_stack+0x18/0x1c)
 [    1.350646]  r7:00000009 r6:0000083e r5:c00840a0 r4:00000000
 [    1.356628] [<c04d5420>] (dump_stack+0x0/0x1c) from [<c003d284>] (warn_slowpath_common+0x54/0x6c)
 [    1.365997] [<c003d230>] (warn_slowpath_common+0x0/0x6c) from [<c003d2c0>] (warn_slowpath_null+0x24/0x2c)
 [    1.376068]  r9:c06f3ce0 r8:00000000 r7:00000000 r6:c069e110 r5:c0708028
 [    1.382965] r4:00000000 [    1.385742] [<c003d29c>] (warn_slowpath_null+0x0/0x2c) from [<c00840a0>] (__alloc_pages_nodemask+0x458/0x62c)
 [    1.396209] [<c0083c48>] (__alloc_pages_nodemask+0x0/0x62c) from [<c001a2c8>] (__dma_alloc+0x90/0x308)
 [    1.406036] [<c001a238>] (__dma_alloc+0x0/0x308) from [<c001a5d0>] (dma_alloc_coherent+0x5c/0x68)
 [    1.415374] [<c001a574>] (dma_alloc_coherent+0x0/0x68) from [<c04cd0cc>] (fb_probe+0x7a8/0xbc4)
 [    1.424530]  r7:cf9bc608 r6:007d0000 r5:cf9c1a54 r4:c06d2844
 [    1.430541] [<c04cc924>] (fb_probe+0x0/0xbc4) from [<c02648e4>] (platform_drv_probe+0x20/0x24)
 [    1.439605] [<c02648c4>] (platform_drv_probe+0x0/0x24) from [<c026342c>] (driver_probe_device+0xa0/0x1b0)
 [    1.449707] [<c026338c>] (driver_probe_device+0x0/0x1b0) from [<c0263618>] (__device_attach+0x44/0x48)
 [    1.459503]  r9:c002ff2c r8:c0714d8c r7:00000000 r6:c02635d4 r5:cf9bc608
 [    1.466400] r4:c06d2788
 [    1.469177] [<c02635d4>] (__device_attach+0x0/0x48) from [<c02628d8>] (bus_for_each_drv+0x68/0x94)
 [    1.478607]  r5:cf81dc48 r4:cf9bc608
 [    1.482391] [<c0262870>] (bus_for_each_drv+0x0/0x94) from [<c02636e4>] (device_attach+0x9c/0xc0)
 [    1.491638]  r7:c06be7f0 r6:00000000 r5:cf9bc63c r4:cf9bc608
 [    1.497650] [<c0263648>] (device_attach+0x0/0xc0) from [<c02626dc>] (bus_probe_device+0x2c/0x48)
 [    1.506896]  r7:c06be7f0 r6:00000000 r5:cf9bc610 r4:cf9bc608
 [    1.512878] [<c02626b0>] (bus_probe_device+0x0/0x48) from [<c0261554>] (device_add+0x4c4/0x590)
 [    1.522064] [<c0261090>] (device_add+0x0/0x590) from [<c0264f80>] (platform_device_add+0x100/0x19c)
 [    1.531616] [<c0264e80>] (platform_device_add+0x0/0x19c) from [<c00332dc>] (omap_device_register+0x28/0x2c)
 [    1.541870]  r7:c05c6868 r6:00000000 r5:cf9c4e00 r4:cf9bc600
 [    1.547851] [<c00332b4>] (omap_device_register+0x0/0x2c) from [<c00338b4>] (omap_device_build_ss+0x108/0x144)
 [    1.558319] [<c00337ac>] (omap_device_build_ss+0x0/0x144) from [<c0033944>] (omap_device_build+0x54/0x5c)
 [    1.568420] [<c00338f0>] (omap_device_build+0x0/0x5c) from [<c06685a0>] (am33xx_register_lcdc+0x64/0xb0)
 [    1.578399]  r4:00000000 [    1.581085] [<c066853c>] (am33xx_register_lcdc+0x0/0xb0) from [<c002f778>] (lcdc_init+0x30/0x60)
 [    1.590332]  r6:00000001 r5:00000001 r4:c06bd128
 [    1.595245] [<c002f748>] (lcdc_init+0x0/0x60) from [<c002f1f8>] (_configure_device+0x70/0xdc)
 [    1.604217] [<c002f188>] (_configure_device+0x0/0xdc) from [<c0030130>] (am335x_evm_setup+0x204/0x4ac)
 [    1.614044]  r7:00000000 r6:cf8a0820 r5:00000000 r4:c06bdac0
 [    1.620025] [<c002ff2c>] (am335x_evm_setup+0x0/0x4ac) from [<c0276794>] (at24_probe+0x45c/0x4e4)
 [    1.629272]  r6:cf8a0820 r5:cf8a0800 r4:cf9c3d40
 [    1.634185] [<c0276338>] (at24_probe+0x0/0x4e4) from [<c032c66c>] (i2c_device_probe+0xb4/0xec)
 [    1.643249] [<c032c5b8>] (i2c_device_probe+0x0/0xec) from [<c026342c>] (driver_probe_device+0xa0/0x1b0)
 [    1.653137]  r7:c06d7558 r6:cf8a0854 r5:c0714db0 r4:cf8a0820 [    1.659118] [<c026338c>] (driver_probe_device+0x0/0x1b0) from [<c02635d0>] (__driver_attach+0x94/0x98)
 [    1.668945]  r9:00000000 r8:00000000 r7:00000000 r6:cf8a0854 r5:c06d7558
 [    1.675842] r4:cf8a0820 [    1.678588] [<c026353c>] (__driver_attach+0x0/0x98) from [<c0262be0>] (bus_for_each_dev+0x68/0x94)
 [    1.688049]  r7:00000000 r6:c026353c r5:cf81dec8 r4:c06d7558
 [    1.694030] [<c0262b78>] (bus_for_each_dev+0x0/0x94) from [<c026327c>] (driver_attach+0x24/0x28)
 [    1.703277]  r7:00000000 r6:cf9c3ec0 r5:c06e3db0 r4:c06d7558
 [    1.709259] [<c0263258>] (driver_attach+0x0/0x28) from [<c0262448>] (bus_add_driver+0xa8/0x23c)
 [    1.718444] [<c02623a0>] (bus_add_driver+0x0/0x23c) from [<c0263c34>] (driver_register+0x80/0x144)
 [    1.727905] [<c0263bb4>] (driver_register+0x0/0x144) from [<c032cab0>] (i2c_register_driver+0x34/0xbc)
 [    1.737701]  r9:00000000 r8:00000000 r7:00000013 r6:00000000 r5:c06f4180
 [    1.744598] r4:c06d7530
 [    1.747375] [<c032ca7c>] (i2c_register_driver+0x0/0xbc) from [<c067b8f8>] (at24_init+0x48/0x54)
 [    1.756530]  r5:c06f4180 r4:c069ab4c
 [    1.760314] [<c067b8b0>] (at24_init+0x0/0x54) from [<c0008610>] (do_one_initcall+0x44/0x1a4)
 [    1.769195] [<c00085cc>] (do_one_initcall+0x0/0x1a4) from [<c0660288>] (kernel_init+0x80/0x124)
 [    1.778381] [<c0660208>] (kernel_init+0x0/0x124) from [<c0040884>] (do_exit+0x0/0x6ac)
 [    1.786712]  r5:c0660208 r4:00000000
 [    1.790557] ---[ end trace b4622b5c66012fd7 ]---
 [    1.795440] da8xx_lcdc da8xx_lcdc.0: GLCD: kmalloc for frame buffer failed
 [    1.802703] da8xx_lcdc: probe of da8xx_lcdc.0 failed with error -22


AM3359 LCD 16bit RGB   24Bit BGR。
board-am335xevm.c
static const struct display_panel disp_panel = {
    WVGA,
    16,
    24,
    COLOR_ACTIVE,
};
static struct lcd_ctrl_config lcd_cfg = {
    &disp_panel,
    .ac_bias        = 255,
    .ac_bias_intrpt        = 0,
    .dma_burst_sz        = 16,
    .bpp            = 24,
    .fdd            = 0x80,
    .tft_alt_mode        = 0,
    .stn_565_mode        = 0,
    .mono_8bit_mode        = 0,
    .invert_line_clock    = 1,
    .invert_frm_clock    = 1,
    .sync_edge        = 0,
    .sync_ctrl        = 1,
    .raster_order        = 0,
};
am335x_evm_defconfig：FB_DA8XX_CONSISTENT_DMA_SIZE 14

How to resolve this problem?

Please suggest

Thanks

What kernel are you using?

Have tried this patch?

What is your desired resolution? 800×480?

static const struct display_panel disp_panel = {
    WVGA,
    16,
    24,
    COLOR_ACTIVE,
};

to

static const struct display_panel disp_panel = {
    WVGA,
    24,
    16,
    COLOR_ACTIVE,
};