hi ,
I'm trying to get Linux framebuffer output with VDMA and AXI4-Stream to Video Out. The hardware is Trenz Electronic TE820 XCZU4EV SOM board,and a custom carry board.
The kernel version is linux-xlnx-2018.2. And the display hardware pipeline is depicted below:
vdma-[remap]-(rgb2yuv)-(cresample)-(osd)-[axi2vid]-adv7511
vdma-- | |
axiclkgen ->vtc When the kernel started, I got those panic message:
[ 2.248924] Synchronous External Abort: synchronous external abort (0x96000210) at 0xffffff800ab20000
[ 2.258020] Internal error: : 96000210 [#1] SMP
[ 2.262511] Modules linked in:
[ 2.265540] CPU: 2 PID: 1 Comm: swapper/0 Not tainted 4.14.0 #49
[ 2.271506] Hardware name: Trenz TE820 (DT)
[ 2.275659] task: ffffffc06d846d00 task.stack: ffffff8008038000
[ 2.281543] PC is at xilinx_vtc_reset+0x14/0x30
[ 2.286041] LR is at xilinx_vtc_probe+0xcc/0x168
[ 2.290624] pc : [<ffffff800854c4cc>] lr : [<ffffff800854c604>] pstate: 60000045
[ 2.297975] sp : ffffff800803bb40
[ 2.301263] x29: ffffff800803bb40 x28: ffffff8008e06f28
[ 2.306539] x27: 0000000000000007 x26: ffffff8008df9068
[ 2.311815] x25: 0000000000000000 x24: ffffff8008e59000
[ 2.317092] x23: ffffffc06da92018 x22: ffffffc06db90100
[ 2.322368] x21: ffffffc06db29010 x20: ffffffc06ffcf848
[ 2.327645] x19: ffffffc06db90098 x18: 0000000000000001
[ 2.332921] x17: 0000000000000001 x16: 0000000000000019
[ 2.338198] x15: ffffffffffffffff x14: ffffff808803ba15
[ 2.343474] x13: ffff000000000000 x12: 0000000000000010
[ 2.348751] x11: 0101010101010101 x10: ffffffff7f7f7f7f
[ 2.354027] x9 : 0000000000000000 x8 : ffffffc06c875300
[ 2.359304] x7 : ffffffc06c875348 x6 : ffffffc06c875348
[ 2.364580] x5 : ffffffc06c875648 x4 : ffffffc06db29210
[ 2.369857] x3 : ffffffc06ce21680 x2 : ffffff800ab20000
[ 2.375133] x1 : ffffff800ab20000 x0 : ffffffc06db90098
[ 2.380411] Process swapper/0 (pid: 1, stack limit = 0xffffff8008038000)
[ 2.387070] Call trace:
[ 2.389494] Exception stack(0xffffff800803ba00 to 0xffffff800803bb40)
[ 2.395896] ba00: ffffffc06db90098 ffffff800ab20000 ffffff800ab20000 ffffffc06ce21680
[ 2.403681] ba20: ffffffc06db29210 ffffffc06c875648 ffffffc06c875348 ffffffc06c875348
[ 2.411466] ba40: ffffffc06c875300 0000000000000000 ffffffff7f7f7f7f 0101010101010101
[ 2.419251] ba60: 0000000000000010 ffff000000000000 ffffff808803ba15 ffffffffffffffff
[ 2.427035] ba80: 0000000000000019 0000000000000001 0000000000000001 ffffffc06db90098
[ 2.434821] baa0: ffffffc06ffcf848 ffffffc06db29010 ffffffc06db90100 ffffffc06da92018
[ 2.442605] bac0: ffffff8008e59000 0000000000000000 ffffff8008df9068 0000000000000007
[ 2.450391] bae0: ffffff8008e06f28 ffffff800803bb40 ffffff800854c604 ffffff800803bb40
[ 2.458176] bb00: ffffff800854c4cc 0000000060000045 ffffffc06db29010 ffffffc06db90100
[ 2.465961] bb20: ffffffffffffffff ffffff8008e59000 ffffff800803bb40 ffffff800854c4cc
[ 2.473746] [<ffffff800854c4cc>] xilinx_vtc_reset+0x14/0x30
[ 2.479282] [<ffffff800854822c>] xilinx_drm_crtc_create+0x194/0x3b8
[ 2.485510] [<ffffff8008548b1c>] xilinx_drm_platform_probe+0x74/0x3c8
[ 2.491910] [<ffffff8008569ab0>] platform_drv_probe+0x58/0xb8
[ 2.497620] [<ffffff8008567bcc>] driver_probe_device+0x2bc/0x440
[ 2.503589] [<ffffff8008567e50>] __driver_attach+0x100/0x118
[ 2.509211] [<ffffff800856594c>] bus_for_each_dev+0x4c/0x98
[ 2.514747] [<ffffff80085673a0>] driver_attach+0x20/0x28
[ 2.520023] [<ffffff8008566db4>] bus_add_driver+0x1f4/0x280
[ 2.525560] [<ffffff8008568898>] driver_register+0x60/0xf8
[ 2.531008] [<ffffff8008569a00>] __platform_driver_register+0x40/0x48
[ 2.537411] [<ffffff8008dc2c98>] xilinx_drm_private_driver_init+0x18/0x20
[ 2.544157] [<ffffff80080839a8>] do_one_initcall+0x38/0x120
[ 2.549693] [<ffffff8008da0cd4>] kernel_init_freeable+0x138/0x1d8
[ 2.555748] [<ffffff8008a3b640>] kernel_init+0x10/0x100
[ 2.560938] [<ffffff8008084a88>] ret_from_fork+0x10/0x18
[ 2.566216] Code: d5033e9f 52b00001 b9000041 f9400001 (b9400021)
[ 2.572272] ---[ end trace 97be0d45cc5b664f ]---
[ 2.576869] Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b
[ 2.576869]
[ 2.585936] SMP: stopping secondary CPUs
[ 2.589828] Kernel Offset: disabled
[ 2.593288] CPU features: 0x002004
[ 2.596660] Memory Limit: none
[ 2.599690] ---[ end Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b
[ 2.599690]
The PC is at : ffffff800854c4cc,I use the addrline tool to find the line
hsq@hsq-vm:~/projects/opensouce/kernel/zynq/linux-xlnx-xilinx-v2018.2$ aarch64-linux-gnu-addr2line -f -e vmlinux ffffff800854c4cc
__raw_readl
The __raw_readl() funtction cause the kernel panic. (xilinx_drm_read() -> readl() -> readlrelaxed() -> __raw_readl() )
I comment the function call xilinx_drm_read() in xilinx_vtc_probe(),the panic disappear，but it's just a temporary workaround.
/* probe vtc */
struct xilinx_vtc *xilinx_vtc_probe(struct device *dev,
struct device_node *node)
{
struct xilinx_vtc *vtc;
const struct of_device_id *match;
struct resource res;
int ret;
match = of_match_node(xilinx_vtc_of_match, node);
if (!match) {
dev_err(dev, "failed to match the device node\n");
return ERR_PTR(-ENODEV);
}
vtc = devm_kzalloc(dev, sizeof(*vtc), GFP_KERNEL);
if (!vtc)
return ERR_PTR(-ENOMEM);
ret = of_address_to_resource(node, 0, &res);
if (ret) {
dev_err(dev, "failed to of_address_to_resource\n");
return ERR_PTR(ret);
}
vtc->base = devm_ioremap_resource(dev, &res);
if (IS_ERR(vtc->base))
return ERR_CAST(vtc->base);
//xilinx_vtc_intr_disable(vtc, VTC_IXR_ALLINTR_MASK);//temp debug
vtc->irq = irq_of_parse_and_map(node, 0);
if (vtc->irq > 0) {
ret = devm_request_irq(dev, vtc->irq, xilinx_vtc_intr_handler,
IRQF_SHARED, "xilinx_vtc", vtc);
if (ret) {
dev_warn(dev, "failed to requet_irq() for vtc\n");
return ERR_PTR(ret);
}
}
//xilinx_vtc_reset(vtc);//temp_debug
return vtc;
}Any iedas?
BestRegards,
HSQ
