am335x LCD问题

似乎需要配置成16bit的才可以，你是不是配成24bit了

Yaoming Qin 你好。我现在要用1024*600的屏。用的是32的BPP。请问要怎修改。谢谢用的是最新的05.05的EVM开发环境。用16位的显示只能显示屏的上半部分，还是两个桌面一起显示的。就是ti的ui起来后是两个一模一样的桌面。出现错误的地方在DMA_ALLOC....()函数里。但是跟了好久的代码硬是没看明白怎么改。是不是335x里面规定了framebuffer的大小？如是，在哪改？

你看看 board-am335xevm.c 里面的 结构体

static struct lcd_ctrl_config lcd_cfg = {

&disp_panel,

.ac_bias = 255,

.ac_bias_intrpt = 0,

.dma_burst_sz = 16,

.bpp = 32,

.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,

};

你好，你的问题解决了吗，我遇到同样的问题，
AM3359 24bit 1024*768 LCD  出错“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 现已经换成BGR。
我的修改如下：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,
};
在am335x_evm_defconfig文件：FB_DA8XX_CONSISTENT_DMA_SIZE 已改为14，还是出现如上错误。

知道是什么原因吗？求指导。。

你好，你按下面 改下，下面是原因和步骤。 推荐你以后还是去ti的e2e网站问问题吧，这里没什么人回答。

It is Linux kernel limit. AM335x Linux kernel has 1024 number pages, than the page size is 4096 bytes.

So "dma_alloc_coherent()" can't allocating more than 4MB.

Fellow these step, resolve this problem:

1. Please, modify the "#define MAX_ORDER 12" in the include/linux/mmzone.h

2. Please tune menuconfig option, FB_DA8XX_CONSISTENT_DMA_SIZE [=5] or more

3. Rebuild your Linux kernel

BR

你好，我用am3359带奇美10‘4的屏，1024*768*24，按照你提供的步骤，还是出现”GLCD: kmalloc for frame buffer failed“错误，

MAX_ORDER 12

FB_DA8XX_CONSISTENT_DMA_SIZE [=6]

感觉FB_DA8XX_CONSISTENT_DMA_SIZE的值没有被修改。。。。

请问还有其它需要注意的地方吗？

我给TI已经发了邮件现在还没有回。。。

我用的是1024*600*32位的。改了那些之后就malloc成功了。你把定义MAX_ORDER 12的那个判断注释掉，自己定义下#define MAX_ORDER 12。其他的好像没有什么了 ，可以把DMA_SIZE扩大在试试。

非常感谢，，，，，将原定义MAX_ORDER 12的那个判断注释掉，自己定义#define MAX_ORDER 12 ，后成功了，，，谢谢你的指点。