* drm timing problems in sama5d3 Xplained.
@ 2016-09-05 9:04 Alex Vazquez
2016-09-05 10:06 ` Boris Brezillon
0 siblings, 1 reply; 2+ messages in thread
From: Alex Vazquez @ 2016-09-05 9:04 UTC (permalink / raw)
To: dri-devel, Boris Brezillon
[-- Attachment #1.1: Type: text/plain, Size: 1273 bytes --]
Hi All.
I am using DRM in a sama5d3 Xplained with display TM43 and I've found with
the following problem:
I deleted the network interfaces in the device tree for my system to boot
faster. My problem is that now the startup script run before the driver has
loaded correctly.
I explain better:
The startup script begin to appear before the creation of the framebuffer
message appears. (See LogKernel.txt)
atmel-hlcdc-display-controller atmel-hlcdc-dc: fb0: frame buffer device
1 - I can't use the framebuffer until the message is not displayed. (This
did not matter. I want to use drm.)
2 - DRM don't work fine. If I try to paint on the screen (using planes)
before the message it is created framebuffer appears, nothing appears on
the display.
This problem I can replicate with the demo atmel if I remove network
interfaces in the device tree and adding a startup script that uses drm.
I add the demo with the modified device tree so you can prove that occurs.
https://drive.google.com/file/d/0B3EMwEbIHhkAbDhGMU1BcEVoYkU/view?usp=sharing
You only need to add the startup script in /etc/rcS.d/
#!/bin/sh
> modetest -M atmel-hlcdc -P 26:480x272+0+0@AR15
I also tested with the latest version of kernel 4.8 RC3 and the problem is
still happening.
Thanks!
Regards!
[-- Attachment #1.2: Type: text/html, Size: 2070 bytes --]
[-- Attachment #2: LogKernel.txt --]
[-- Type: text/plain, Size: 17228 bytes --]
[ 0.000000] Booting Linux on physical CPU 0x0
[ 0.000000] Linux version 4.1.0-linux4sam_5.3 (ldesroches@ibiza) (gcc version 5.2.0 (GCC) ) #1 Sat Apr 16 13:00:00 CEST 2016
[ 0.000000] CPU: ARMv7 Processor [410fc051] revision 1 (ARMv7), cr=10c53c7d
[ 0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache
[ 0.000000] Machine model: Atmel SAMA5D3 Xplained TM43xx
[ 0.000000] cma: Reserved 64 MiB at 0x28000000
[ 0.000000] Memory policy: Data cache writeback
[ 0.000000] On node 0 totalpages: 65536
[ 0.000000] free_area_init_node: node 0, pgdat c06e20c4, node_mem_map cfdda000
[ 0.000000] Normal zone: 512 pages used for memmap
[ 0.000000] Normal zone: 0 pages reserved
[ 0.000000] Normal zone: 65536 pages, LIFO batch:15
[ 0.000000] CPU: All CPU(s) started in SVC mode.
[ 0.000000] pcpu-alloc: s0 r0 d32768 u32768 alloc=1*32768
[ 0.000000] pcpu-alloc: [0] 0
[ 0.000000] Built 1 zonelists in Zone order, mobility grouping off. Total pages: 65024
[ 0.000000] Kernel command line: console=ttyS0,115200 mtdparts=atmel_nand:256k(bootstrap)ro,512k(uboot)ro,256k(env),256k(env_redundant),256k(spare),512k(dtb),6M(kernel)ro,-(ro6
[ 0.000000] PID hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.000000] Dentry cache hash table entries: 32768 (order: 5, 131072 bytes)
[ 0.000000] Inode-cache hash table entries: 16384 (order: 4, 65536 bytes)
[ 0.000000] Memory: 186824K/262144K available (4985K kernel code, 179K rwdata, 1660K rodata, 192K init, 159K bss, 9784K reserved, 65536K cma-reserved)
[ 0.000000] Virtual kernel memory layout:
vector : 0xffff0000 - 0xffff1000 ( 4 kB)
fixmap : 0xffc00000 - 0xfff00000 (3072 kB)
vmalloc : 0xd0800000 - 0xff000000 ( 744 MB)
lowmem : 0xc0000000 - 0xd0000000 ( 256 MB)
modules : 0xbf000000 - 0xc0000000 ( 16 MB)
.text : 0xc0008000 - 0xc0685928 (6647 kB)
.init : 0xc0686000 - 0xc06b6000 ( 192 kB)
.data : 0xc06b6000 - 0xc06e2ed8 ( 180 kB)
.bss : 0xc06e2ed8 - 0xc070ad3c ( 160 kB)
[ 0.000000] NR_IRQS:16 nr_irqs:16 16
[ 0.000000] clocksource pit: mask: 0xfffffff max_cycles: 0xfffffff, max_idle_ns: 14479245754 ns
[ 0.000000] sched_clock: 32 bits at 100 Hz, resolution 10000000ns, wraps every 21474836475000000ns
[ 0.000000] Console: colour dummy device 80x30
[ 0.050000] Calibrating delay loop... 351.43 BogoMIPS (lpj=1757184)
[ 0.060000] pid_max: default: 32768 minimum: 301
[ 0.060000] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.060000] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.060000] CPU: Testing write buffer coherency: ok
[ 0.060000] Setting up static identity map for 0x20008200 - 0x20008258
[ 0.060000] devtmpfs: initialized
[ 0.070000] VFP support v0.3: implementor 41 architecture 2 part 30 variant 5 rev 1
[ 0.080000] clocksource jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
[ 0.080000] pinctrl core: initialized pinctrl subsystem
[ 0.080000] NET: Registered protocol family 16
[ 0.110000] DMA: preallocated 256 KiB pool for atomic coherent allocations
[ 0.110000] cpuidle: using governor ladder
[ 0.110000] cpuidle: using governor menu
[ 0.110000] AT91: Detected SoC family: sama5d3
[ 0.110000] AT91: Detected SoC: sama5d36, revision 2
[ 0.130000] gpio-at91 fffff200.gpio: at address d0818200
[ 0.130000] gpio-at91 fffff400.gpio: at address d081a400
[ 0.130000] gpio-at91 fffff600.gpio: at address d081c600
[ 0.130000] gpio-at91 fffff800.gpio: at address d081e800
[ 0.140000] gpio-at91 fffffa00.gpio: at address d0820a00
[ 0.140000] pinctrl-at91 ahb:apb:pinctrl@fffff200: initialized AT91 pinctrl driver
[ 0.140000] tcb_clksrc: tc0 at 16.000 MHz
[ 0.140000] clocksource tcb_clksrc: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 115833966437 ns
[ 1.380000] at_hdmac ffffe600.dma-controller: Atmel AHB DMA Controller ( cpy set slave sg-cpy ), 8 channels
[ 1.380000] at_hdmac ffffe800.dma-controller: Atmel AHB DMA Controller ( cpy set slave sg-cpy ), 8 channels
[ 1.390000] SCSI subsystem initialized
[ 1.390000] usbcore: registered new interface driver usbfs
[ 1.390000] usbcore: registered new interface driver hub
[ 1.390000] usbcore: registered new device driver usb
[ 1.390000] at91_i2c f0014000.i2c: using dma0chan0 (tx) and dma0chan1 (rx) for DMA transfers
[ 1.390000] at91_i2c f0014000.i2c: AT91 i2c bus driver (hw version: 0x402).
[ 1.400000] at91_i2c f0018000.i2c: using dma0chan2 (tx) and dma0chan3 (rx) for DMA transfers
[ 1.400000] at91_i2c f0018000.i2c: AT91 i2c bus driver (hw version: 0x402).
[ 1.400000] at91_i2c f801c000.i2c: can't use DMA, error -19
[ 1.400000] at91_i2c f801c000.i2c: AT91 i2c bus driver (hw version: 0x402).
[ 1.400000] media: Linux media interface: v0.10
[ 1.400000] Linux video capture interface: v2.00
[ 1.400000] Advanced Linux Sound Architecture Driver Initialized.
[ 1.410000] Switched to clocksource tcb_clksrc
[ 1.450000] NET: Registered protocol family 2
[ 1.450000] TCP established hash table entries: 2048 (order: 1, 8192 bytes)
[ 1.450000] TCP bind hash table entries: 2048 (order: 1, 8192 bytes)
[ 1.450000] TCP: Hash tables configured (established 2048 bind 2048)
[ 1.450000] UDP hash table entries: 256 (order: 0, 4096 bytes)
[ 1.450000] UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)
[ 1.450000] NET: Registered protocol family 1
[ 1.450000] RPC: Registered named UNIX socket transport module.
[ 1.450000] RPC: Registered udp transport module.
[ 1.450000] RPC: Registered tcp transport module.
[ 1.450000] RPC: Registered tcp NFSv4.1 backchannel transport module.
[ 1.450000] futex hash table entries: 256 (order: -1, 3072 bytes)
[ 1.460000] io scheduler noop registered (default)
[ 1.480000] f001c000.serial: ttyS1 at MMIO 0xf001c000 (irq = 30, base_baud = 4125000) is a ATMEL_SERIAL
[ 1.480000] f0020000.serial: ttyS2 at MMIO 0xf0020000 (irq = 31, base_baud = 4125000) is a ATMEL_SERIAL
[ 1.480000] f0024000.serial: ttyS5 at MMIO 0xf0024000 (irq = 32, base_baud = 4125000) is a ATMEL_SERIAL
[ 1.480000] ffffee00.serial: ttyS0 at MMIO 0xffffee00 (irq = 43, base_baud = 8250000) is a ATMEL_SERIAL
[ 1.860000] console [ttyS0] enabled
[ 1.870000] [drm] Initialized drm 1.1.0 20060810
[ 1.880000] brd: module loaded
[ 1.900000] loop: module loaded
[ 1.900000] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[ 1.910000] [drm] No driver support for vblank timestamp query.
[ 1.910000] atmel-hlcdc-display-controller atmel-hlcdc-dc: failed to create HLCDC outputs: -517
[ 1.920000] atmel-hlcdc-display-controller atmel-hlcdc-dc: failed to initialize mode setting
[ 1.930000] atmel_nand_nfc 70000000.nfc: NFC is probed.
[ 1.940000] atmel_nand 60000000.nand: Use On Flash BBT
[ 1.940000] atmel_nand 60000000.nand: Using dma0chan4 for DMA transfers.
[ 1.950000] nand: device found, Manufacturer ID: 0x2c, Chip ID: 0xda
[ 1.950000] nand: Micron MT29F2G08ABAEAWP
[ 1.960000] nand: 256 MiB, SLC, erase size: 128 KiB, page size: 2048, OOB size: 64
[ 1.960000] atmel_nand 60000000.nand: minimum ECC: 4 bits in 512 bytes
[ 1.970000] atmel_nand 60000000.nand: Initialize PMECC params, cap: 4, sector: 512
[ 1.970000] atmel_nand 60000000.nand: Using NFC Sram read
[ 1.980000] Bad block table found at page 131008, version 0x01
[ 1.980000] Bad block table found at page 130944, version 0x01
[ 1.990000] 8 cmdlinepart partitions found on MTD device atmel_nand
[ 1.990000] Creating 8 MTD partitions on "atmel_nand":
[ 2.000000] 0x000000000000-0x000000040000 : "bootstrap"
[ 2.000000] 0x000000040000-0x0000000c0000 : "uboot"
[ 2.010000] 0x0000000c0000-0x000000100000 : "env"
[ 2.020000] 0x000000100000-0x000000140000 : "env_redundant"
[ 2.020000] 0x000000140000-0x000000180000 : "spare"
[ 2.030000] 0x000000180000-0x000000200000 : "dtb"
[ 2.040000] 0x000000200000-0x000000800000 : "kernel"
[ 2.040000] 0x000000800000-0x000010000000 : "rootfs"
[ 2.050000] atmel_spi f0004000.spi: version: 0x213
[ 2.050000] atmel_spi f0004000.spi: Using dma0chan5 (tx) and dma0chan6 (rx) for DMA transfers
[ 2.060000] atmel_spi f0004000.spi: Atmel SPI Controller at 0xf0004000 (irq 26)
[ 2.070000] atmel_spi f8008000.spi: version: 0x213
[ 2.070000] atmel_spi f8008000.spi: Using dma1chan0 (tx) and dma1chan1 (rx) for DMA transfers
[ 2.080000] atmel_spi f8008000.spi: Atmel SPI Controller at 0xf8008000 (irq 35)
[ 2.090000] CAN device driver interface
[ 2.090000] at91_can f000c000.can: device registered (reg_base=d089e000, irq=49)
[ 2.100000] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[ 2.110000] ehci-atmel: EHCI Atmel driver
[ 2.110000] atmel-ehci 700000.ehci: EHCI Host Controller
[ 2.120000] atmel-ehci 700000.ehci: new USB bus registered, assigned bus number 1
[ 2.120000] atmel-ehci 700000.ehci: irq 53, io mem 0x00700000
[ 2.150000] atmel-ehci 700000.ehci: USB 2.0 started, EHCI 1.00
[ 2.150000] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002
[ 2.160000] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[ 2.160000] usb usb1: Product: EHCI Host Controller
[ 2.160000] usb usb1: Manufacturer: Linux 4.1.0-linux4sam_5.3 ehci_hcd
[ 2.170000] usb usb1: SerialNumber: 700000.ehci
[ 2.170000] hub 1-0:1.0: USB hub found
[ 2.180000] hub 1-0:1.0: 3 ports detected
[ 2.180000] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
[ 2.190000] ohci-atmel: OHCI Atmel driver
[ 2.190000] at91_ohci 600000.ohci: USB Host Controller
[ 2.190000] at91_ohci 600000.ohci: new USB bus registered, assigned bus number 2
[ 2.200000] at91_ohci 600000.ohci: irq 53, io mem 0x00600000
[ 2.260000] usb usb2: New USB device found, idVendor=1d6b, idProduct=0001
[ 2.260000] usb usb2: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[ 2.270000] usb usb2: Product: USB Host Controller
[ 2.270000] usb usb2: Manufacturer: Linux 4.1.0-linux4sam_5.3 ohci_hcd
[ 2.280000] usb usb2: SerialNumber: at91
[ 2.280000] hub 2-0:1.0: USB hub found
[ 2.290000] hub 2-0:1.0: 3 ports detected
[ 2.290000] usbcore: registered new interface driver cdc_acm
[ 2.300000] cdc_acm: USB Abstract Control Model driver for USB modems and ISDN adapters
[ 2.300000] usbcore: registered new interface driver usb-storage
[ 2.310000] usbcore: registered new interface driver usbserial
[ 2.310000] usbcore: registered new interface driver usbserial_generic
[ 2.320000] usbserial: USB Serial support registered for generic
[ 2.320000] usbcore: registered new interface driver ftdi_sio
[ 2.330000] usbserial: USB Serial support registered for FTDI USB Serial Device
[ 2.330000] usbcore: registered new interface driver pl2303
[ 2.340000] usbserial: USB Serial support registered for pl2303
[ 2.350000] qt1070 1-001b: AT42QT1070 firmware version 15
[ 2.830000] input: AT42QT1070 QTouch Sensor as /devices/soc0/ahb/ahb:apb/f0018000.i2c/i2c-1/1-001b/input/input0
[ 2.840000] atmel_mxt_ts 1-004a: __mxt_read_reg: i2c transfer failed (-121)
[ 2.840000] atmel_mxt_ts 1-004a: mxt_bootloader_read: i2c recv failed (-121)
[ 2.850000] atmel_mxt_ts 1-004a: Trying alternate bootloader address
[ 2.860000] atmel_mxt_ts 1-004a: mxt_bootloader_read: i2c recv failed (-121)
[ 3.070000] atmel_mxt_ts 1-004a: Try a second time to init maxtouch
[ 3.110000] rtc rtc0: alarm rollover not handled
[ 3.120000] rtc rtc0: invalid alarm value: 1900-1-1 0:0:0
[ 3.120000] atmel_mxt_ts 1-004a: Direct firmware load for maxtouch.cfg failed with error -2
[ 3.130000] at91_rtc fffffeb0.rtc: rtc core: registered fffffeb0.rtc as rtc0
[ 3.130000] at91_rtc fffffeb0.rtc: AT91 Real Time Clock driver.
[ 3.140000] i2c /dev entries driver
[ 3.140000] input: Atmel maXTouch Touchscreen as /devices/soc0/ahb/ahb:apb/f0018000.i2c/i2c-1/1-004a/input/input1
[ 3.150000] atmel_mxt_ts 1-004a: Family: 130 Variant: 36 Firmware V2.1.AA Objects: 24
[ 3.160000] AT91: Starting after user reset
[ 3.170000] sdhci: Secure Digital Host Controller Interface driver
[ 3.170000] sdhci: Copyright(c) Pierre Ossman
[ 3.180000] atmel_mci f0000000.mmc: version: 0x505
[ 3.180000] atmel_mci f0000000.mmc: using dma0chan7 for DMA transfers
[ 3.230000] atmel_mci f0000000.mmc: Atmel MCI controller at 0xf0000000 irq 25, 1 slots
[ 3.230000] atmel_mci f8000000.mmc: version: 0x505
[ 3.240000] atmel_mci f8000000.mmc: using dma1chan2 for DMA transfers
[ 3.280000] atmel_mci f8000000.mmc: Atmel MCI controller at 0xf8000000 irq 34, 1 slots
[ 3.280000] sdhci-pltfm: SDHCI platform and OF driver helper
[ 3.290000] ledtrig-cpu: registered to indicate activity on CPUs
[ 3.290000] atmel_aes f8038000.aes: version: 0x135
[ 3.300000] atmel_aes f8038000.aes: Atmel AES - Using dma1chan3, dma1chan4 for DMA transfers
[ 3.310000] atmel_sha f8034000.sha: version: 0x410
[ 3.310000] atmel_sha f8034000.sha: using dma1chan5 for DMA transfers
[ 3.320000] atmel_sha f8034000.sha: Atmel SHA1/SHA256/SHA224/SHA384/SHA512
[ 3.330000] atmel_tdes f803c000.tdes: version: 0x701
[ 3.330000] atmel_tdes f803c000.tdes: using dma1chan6, dma1chan7 for DMA transfers
[ 3.340000] atmel_tdes f803c000.tdes: Atmel DES/TDES
[ 3.340000] usbcore: registered new interface driver usbhid
[ 3.350000] usbhid: USB HID core driver
[ 3.350000] iio iio:device0: Resolution used: 12 bits
[ 3.360000] iio iio:device0: ADC Touch screen is disabled.
[ 3.370000] NET: Registered protocol family 17
[ 3.370000] can: controller area network core (rev 20120528 abi 9)
[ 3.380000] NET: Registered protocol family 29
[ 3.380000] can: raw protocol (rev 20120528)
[ 3.380000] can: broadcast manager protocol (rev 20120528 t)
[ 3.390000] can: netlink gateway (rev 20130117) max_hops=1
[ 3.400000] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[ 3.400000] [drm] No driver support for vblank timestamp query.
[ 3.410000] atmel-hlcdc-display-controller atmel-hlcdc-dc: DRM device successfully registered
[ 3.420000] ubi0: attaching mtd7
[ 4.050000] random: nonblocking pool is initialized
[ 4.400000] ubi0: scanning is finished
[ 4.410000] ubi0: attached mtd7 (name "rootfs", size 248 MiB)
[ 4.420000] ubi0: PEB size: 131072 bytes (128 KiB), LEB size: 126976 bytes
[ 4.420000] ubi0: min./max. I/O unit sizes: 2048/2048, sub-page size 2048
[ 4.430000] ubi0: VID header offset: 2048 (aligned 2048), data offset: 4096
[ 4.430000] ubi0: good PEBs: 1980, bad PEBs: 4, corrupted PEBs: 0
[ 4.440000] ubi0: user volume: 1, internal volumes: 1, max. volumes count: 128
[ 4.440000] ubi0: max/mean erase counter: 2/0, WL threshold: 4096, image sequence number: 1326480871
[ 4.450000] ubi0: available PEBs: 0, total reserved PEBs: 1980, PEBs reserved for bad PEB handling: 36
[ 4.460000] ubi0: background thread "ubi_bgt0d" started, PID 655
[ 4.470000] input: gpio_keys as /devices/soc0/gpio_keys/input/input2
[ 4.470000] at91_rtc fffffeb0.rtc: setting system clock to 2016-04-16 11:04:23 UTC (1460804663)
[ 4.490000] mmc0-card-supply: disabling
[ 4.490000] panel-power-supply: disabling
[ 4.490000] ALSA device list:
[ 4.490000] No soundcards found.
[ 4.500000] UBIFS (ubi0:0): background thread "ubifs_bgt0_0" started, PID 664
[ 4.530000] UBIFS (ubi0:0): recovery needed
[ 4.600000] UBIFS (ubi0:0): recovery completed
[ 4.600000] UBIFS (ubi0:0): UBIFS: mounted UBI device 0, volume 0, name "rootfs"
[ 4.610000] UBIFS (ubi0:0): LEB size: 126976 bytes (124 KiB), min./max. I/O unit sizes: 2048 bytes/2048 bytes
[ 4.620000] UBIFS (ubi0:0): FS size: 244936704 bytes (233 MiB, 1929 LEBs), journal size 9023488 bytes (8 MiB, 72 LEBs)
[ 4.630000] UBIFS (ubi0:0): reserved for root: 0 bytes (0 KiB)
[ 4.630000] UBIFS (ubi0:0): media format: w4/r0 (latest is w4/r0), UUID 379EA0A8-80A6-4EE4-97C9-D7B52727962B, small LPT model
[ 4.640000] VFS: Mounted root (ubifs filesystem) on device 0:14.
[ 4.650000] devtmpfs: mounted
[ 4.650000] Freeing unused kernel memory: 192K (c0686000 - c06b6000)
************** Launch modetest -M atmel-hlcdc -P 26:480x272+0+0@AR15 *************************
[ 7.420000] atmel-hlcdc-display-controller atmel-hlcdc-dc: fb0: frame buffer device
[ 7.420000] atmel-hlcdc-display-controller atmel-hlcdc-dc: registered panic notifier
[ 38.860000] udevd[707]: starting version 182
[ 39.140000] atmel_usba_udc 500000.gadget: MMIO registers at 0xf8030000 mapped at d0b10000
[ 39.140000] atmel_usba_udc 500000.gadget: FIFO at 0x00500000 mapped at d2200000
[ 40.130000] ubi0 error: ubi_open_volume: cannot open device 0, volume 0, error -16
[ 40.650000] g_serial gadget: Gadget Serial v2.4
[ 40.650000] g_serial gadget: g_serial ready
[ 41.020000] g_serial gadget: high-speed config #2: CDC ACM config
[-- Attachment #3: Type: text/plain, Size: 160 bytes --]
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^ permalink raw reply [flat|nested] 2+ messages in thread* Re: drm timing problems in sama5d3 Xplained.
2016-09-05 9:04 drm timing problems in sama5d3 Xplained Alex Vazquez
@ 2016-09-05 10:06 ` Boris Brezillon
0 siblings, 0 replies; 2+ messages in thread
From: Boris Brezillon @ 2016-09-05 10:06 UTC (permalink / raw)
To: Alex Vazquez
Hi Alex,
On Mon, 5 Sep 2016 11:04:51 +0200
Alex Vazquez <avazquez.dev@gmail.com> wrote:
> Hi All.
> I am using DRM in a sama5d3 Xplained with display TM43 and I've found with
> the following problem:
> I deleted the network interfaces in the device tree for my system to boot
> faster. My problem is that now the startup script run before the driver has
> loaded correctly.
> I explain better:
> The startup script begin to appear before the creation of the framebuffer
> message appears. (See LogKernel.txt)
>
> atmel-hlcdc-display-controller atmel-hlcdc-dc: fb0: frame buffer device
>
>
> 1 - I can't use the framebuffer until the message is not displayed. (This
> did not matter. I want to use drm.)
> 2 - DRM don't work fine. If I try to paint on the screen (using planes)
> before the message it is created framebuffer appears, nothing appears on
> the display.
>
> This problem I can replicate with the demo atmel if I remove network
> interfaces in the device tree and adding a startup script that uses drm.
>
> I add the demo with the modified device tree so you can prove that occurs.
>
> https://drive.google.com/file/d/0B3EMwEbIHhkAbDhGMU1BcEVoYkU/view?usp=sharing
>
> You only need to add the startup script in /etc/rcS.d/
>
> #!/bin/sh
> > modetest -M atmel-hlcdc -P 26:480x272+0+0@AR15
>
>
> I also tested with the latest version of kernel 4.8 RC3 and the problem is
> still happening.
It seems that the atmel-hlcdc DRM device probe is deferred because some
elements in the display pipeline are missing (the display itself, the
backlight attached to the display, or even the PWM attached to the
backlight).
Can you check if the /dev/dri/xxx files are present when you reach your
init script?
If that's not the case, can you make sure you compiled the different
drivers needed for the display pipeline to work correctly statically?
Thanks,
Boris
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