i.MX6新版BSP之LCD移植

本文由博主girlkoo编写，关于E9与TQIMX6Q开发平台LCD移植的文章。
　　经过前面的移植，eMMC已经可以在tqimx6q上正常运行了，本文将来移植LCD驱动。

DTS编写
　　imx6的LCD控制器与之前的芯片略有不同，详细的信息可以阅读芯片手册。参考sabrelite开发板的DTS，我们可以添加如下内容：

/ {
…

aliases {  
   mxcfb0 = &mxcfb1;  
};  

...  
 
regulators {  
   ...  

   reg_mipi_dsi_pwr_on: mipi_dsi_pwr_on {  
       compatible = "regulator-fixed";  
      regulator-name = "mipi_dsi_pwr_on";  
       gpio = <&gpio6 14 0>;  
      enable-active-high;  
   };   
};  
 
...  
 
backlight {  
   compatible = "pwm-backlight";  
   pwms = <&pwm1 0 5000000>;  
   brightness-levels = <0 4 8 16 32 64 128 255>;  
   default-brightness-level = <7>;  
};  

mipi_dsi_reset: mipi-dsi-reset {  
   compatible = "gpio-reset";  
   reset-gpios = <&gpio6 11 GPIO_ACTIVE_LOW>;  
   reset-delay-us = <50>;  
   #reset-cells = <0>;  
};  

mxcfb1: fb@0 {  
   compatible = "fsl,mxc_sdc_fb";  
   disp_dev = "lcd";  
   interface_pix_fmt = "RGB24";  
   mode_str ="CLAA-WVGA";  
   default_bpp = <24>;  
   int_clk = <0>;  
   late_init = <0>;  
   status = "okay";  
};  

};

…

&mipi_dsi {
dev_id = <0>;
disp_id = <1>;
lcd_panel = “TRULY-WVGA”;
disp-power-on-supply = <®_mipi_dsi_pwr_on>;
resets = <&mipi_dsi_reset>;
status = “okay”;
};

…

添加以上内容后重新编译并烧写DTB。

测试方法

用新的DTB启动内核会发现屏幕上出现了四只可爱的小企鹅，我这里就不发图片了，只附上完整的内核启动Log，详细如下：

U-Boot 2013.04-04987-g98fdbdc-dirty (May 03 2015 - 11:46:24)

CPU: Freescale i.MX6Q rev1.2 at 792 MHz
CPU: Temperature 23 C, calibration data: 0x54e4bb69
Reset cause: POR
Board: MX6Q/SDL-SabreSD
I2C: ready
DRAM: 1 GiB
MMC: FSL_SDHC: 0, FSL_SDHC: 1, FSL_SDHC: 2
No panel detected: default to Hannstar-XGA
Display: Hannstar-XGA (1024x768)
In: serial
Out: serial
Err: serial
mmc0 is current device
Net: Phy not found
PHY reset timed out
FEC [PRIME]
Warning: failed to set MAC address

Normal Boot
Hit any key to stop autoboot: 0
mmc0 is current device

MMC read: dev # 0, block # 2048, count 12288 … 12288 blocks read: OK

MMC read: dev # 0, block # 20480, count 2048 … 2048 blocks read: OK

Booting kernel from Legacy Image at 11ffffc0 …

Image Name: Linux-3.10.17-80739-g33597e3-dir
Image Type: ARM Linux Kernel Image (uncompressed)
Data Size: 5289360 Bytes = 5 MiB
Load Address: 12000000
Entry Point: 12000000
Verifying Checksum … OK

Flattened Device Tree blob at 18000000

Booting using the fdt blob at 0x18000000
XIP Kernel Image … OK
OK
Using Device Tree in place at 18000000, end 1800cb83

Starting kernel …

Booting Linux on physical CPU 0x0
Linux version 3.10.17-80739-g33597e3-dirty (lilianrong@lenovo) (gcc version 4.7.3 (Ubuntu/Linaro 4.7.3-12ubuntu1) ) #3 SMP PREEMPT Wed May 13 00:16:49 CST 2015
CPU: ARMv7 Processor [412fc09a] revision 10 (ARMv7), cr=10c53c7d
CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache
Machine: Freescale i.MX6 Quad/DualLite (Device Tree), model: Freescale i.MX6 Quad TQIMX6Q Smart Device Board
cma: CMA: reserved 320 MiB at 3c000000
Memory policy: ECC disabled, Data cache writealloc
PERCPU: Embedded 8 pages/cpu @814fa000 s8896 r8192 d15680 u32768
Built 1 zonelists in Zone order, mobility grouping on. Total pages: 260096
Kernel command line: noinitrd console=ttymxc0,115200 root=/dev/mmcblk0p1 rw rootfstype=ext4 init=/linuxrc
PID hash table entries: 4096 (order: 2, 16384 bytes)
Dentry cache hash table entries: 131072 (order: 7, 524288 bytes)
Inode-cache hash table entries: 65536 (order: 6, 262144 bytes)
Memory: 1024MB = 1024MB total
Memory: 697788k/697788k available, 350788k reserved, 0K highmem
Virtual kernel memory layout:
vector : 0xffff0000 - 0xffff1000 ( 4 kB)
fixmap : 0xfff00000 - 0xfffe0000 ( 896 kB)
vmalloc : 0xc0800000 - 0xff000000 (1000 MB)
lowmem : 0x80000000 - 0xc0000000 (1024 MB)
pkmap : 0x7fe00000 - 0x80000000 ( 2 MB)
modules : 0x7f000000 - 0x7fe00000 ( 14 MB)
.text : 0x80008000 - 0x80be704c (12157 kB)
.init : 0x80be8000 - 0x80c2a2c0 ( 265 kB)
.data : 0x80c2c000 - 0x80c7c260 ( 321 kB)
.bss : 0x80c7c260 - 0x80ce5434 ( 421 kB)
SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=4, Nodes=1
Preemptible hierarchical RCU implementation.
NR_IRQS:16 nr_irqs:16 16
L310 cache controller enabled
l2x0: 16 ways, CACHE_ID 0x410000c7, AUX_CTRL 0x32070000, Cache size: 1048576 B
sched_clock: 32 bits at 3000kHz, resolution 333ns, wraps every 1431655ms
CPU identified as i.MX6Q, silicon rev 1.2
Console: colour dummy device 80x30
Calibrating delay loop… 1581.05 BogoMIPS (lpj=7905280)
pid_max: default: 32768 minimum: 301
Mount-cache hash table entries: 512
CPU: Testing write buffer coherency: ok
CPU0: thread -1, cpu 0, socket 0, mpidr 80000000
Setting up static identity map for 0x806106a8 - 0x80610700
CPU1: Booted secondary processor
CPU1: thread -1, cpu 1, socket 0, mpidr 80000001
CPU2: Booted secondary processor
CPU2: thread -1, cpu 2, socket 0, mpidr 80000002
CPU3: Booted secondary processor
CPU3: thread -1, cpu 3, socket 0, mpidr 80000003
Brought up 4 CPUs
SMP: Total of 4 processors activated (6324.22 BogoMIPS).
CPU: All CPU(s) started in SVC mode.
devtmpfs: initialized
pinctrl core: initialized pinctrl subsystem
regulator-dummy: no parameters
NET: Registered protocol family 16
DMA: preallocated 256 KiB pool for atomic coherent allocations
Use WDOG1 as reset source
syscon 20c8000.anatop: regmap [mem 0x020c8000-0x020c8fff] registered
vdd1p1: 800 <–> 1375 mV at 1125 mV
vdd3p0: 2800 <–> 3150 mV at 3000 mV
vdd2p5: 2000 <–> 2750 mV at 2425 mV
cpu: 725 <–> 1450 mV at 1150 mV
vddpu: 725 <–> 1450 mV
vddsoc: 725 <–> 1450 mV at 1200 mV
syscon 20e0000.iomuxc-gpr: regmap [mem 0x020e0000-0x020e0037] registered
syscon 21bc000.ocotp-ctrl: regmap [mem 0x021bc000-0x021bffff] registered
hw-breakpoint: found 5 (+1 reserved) breakpoint and 1 watchpoint registers.
hw-breakpoint: maximum watchpoint size is 4 bytes.
imx6q-pinctrl 20e0000.iomuxc: initialized IMX pinctrl driver
bio: create slab at 0
mxs-dma 110000.dma-apbh: initialized
usb_otg_vbus: 5000 mV
mipi_dsi_pwr_on: no parameters
i2c-core: driver [max17135] using legacy suspend method
i2c-core: driver [max17135] using legacy resume method
SCSI subsystem initialized
usbcore: registered new interface driver usbfs
usbcore: registered new interface driver hub
usbcore: registered new device driver usb
Linux video capture interface: v2.00
pps_core: LinuxPPS API ver. 1 registered
pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti
PTP clock support registered
imx-ipuv3 2400000.ipu: IPU DMFC NORMAL mode: 1(0~1), 5B(4,5), 5F(6,7)
imx-ipuv3 2800000.ipu: IPU DMFC NORMAL mode: 1(0~1), 5B(4,5), 5F(6,7)
MIPI CSI2 driver module loaded
Advanced Linux Sound Architecture Driver Initialized.
cfg80211: Calling CRDA to update world regulatory domain
Switching to clocksource mxc_timer1
NET: Registered protocol family 2
TCP established hash table entries: 8192 (order: 4, 65536 bytes)
TCP bind hash table entries: 8192 (order: 4, 65536 bytes)
TCP: Hash tables configured (established 8192 bind 8192)
TCP: reno registered
UDP hash table entries: 512 (order: 2, 16384 bytes)
UDP-Lite hash table entries: 512 (order: 2, 16384 bytes)
NET: Registered protocol family 1
RPC: Registered named UNIX socket transport module.
RPC: Registered udp transport module.
RPC: Registered tcp transport module.
RPC: Registered tcp NFSv4.1 backchannel transport module.
hw perfevents: enabled with ARMv7 Cortex-A9 PMU driver, 7 counters available
pureg-dummy: no parameters
imx6_busfreq busfreq.15: DDR medium rate not supported.
Bus freq driver module loaded
VFS: Disk quotas dquot_6.5.2
Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
NFS: Registering the id_resolver key type
Key type id_resolver registered
Key type id_legacy registered
jffs2: version 2.2. (NAND) 漏 2001-2006 Red Hat, Inc.
fuse init (API version 7.22)
msgmni has been set to 2002
io scheduler noop registered
io scheduler deadline registered
io scheduler cfq registered (default)
imx-weim 21b8000.weim: WEIM driver registered.
mxc_mipi_dsi 21e0000.mipi: i.MX MIPI DSI driver probed
MIPI DSI driver module loaded
mxc_sdc_fb fb.23: register mxc display driver lcd
Console: switching to colour frame buffer device 100x30
imx-sdma 20ec000.sdma: no iram assigned, using external mem
imx-sdma 20ec000.sdma: loaded firmware 1.1
imx-sdma 20ec000.sdma: initialized
Serial: IMX driver
2020000.serial: ttymxc0 at MMIO 0x2020000 (irq = 58) is a IMX
console [ttymxc0] enabled
21e8000.serial: ttymxc1 at MMIO 0x21e8000 (irq = 59) is a IMX
21ec000.serial: ttymxc2 at MMIO 0x21ec000 (irq = 60) is a IMX
21f0000.serial: ttymxc3 at MMIO 0x21f0000 (irq = 61) is a IMX
21f4000.serial: ttymxc4 at MMIO 0x21f4000 (irq = 62) is a IMX
serial: Freescale lpuart driver
[drm] Initialized drm 1.1.0 20060810
[drm] Initialized vivante 1.0.0 20120216 on minor 0
brd: module loaded
loop: module loaded
CAN device driver interface
flexcan 2090000.can: device registered (reg_base=c0a28000, irq=142)
fec 2188000.ethernet (unregistered net_device): Invalid MAC address: 00:00:00:00:00:00
fec 2188000.ethernet (unregistered net_device): Using random MAC address: 3a:bb:80:a1:c6:b2
libphy: fec_enet_mii_bus: probed
fec 2188000.ethernet eth0: registered PHC device 0
ehci_hcd: USB 2.0 ‘Enhanced’ Host Controller (EHCI) Driver
usbcore: registered new interface driver usb-storage
ci_hdrc ci_hdrc.1: doesn’t support gadget
ci_hdrc ci_hdrc.1: EHCI Host Controller
ci_hdrc ci_hdrc.1: new USB bus registered, assigned bus number 1
ci_hdrc ci_hdrc.1: USB 2.0 started, EHCI 1.00
hub 1-0:1.0: USB hub found
hub 1-0:1.0: 1 port detected
mousedev: PS/2 mouse device common for all mice
i2c-core: driver [isl29023] using legacy suspend method
i2c-core: driver [isl29023] using legacy resume method
snvs_rtc 20cc034.snvs-rtc-lp: rtc core: registered 20cc034.snvs-rtc-lp as rtc0
i2c /dev entries driver
i2c-core: driver [mag3110] using legacy suspend method
i2c-core: driver [mag3110] using legacy resume method
imx2-wdt 20bc000.wdog: IMX2+ Watchdog Timer enabled. timeout=60s (nowayout=0)
cpuidle: using governor ladder
cpuidle: using governor menu
sdhci: Secure Digital Host Controller Interface driver
sdhci: Copyright© Pierre Ossman
sdhci-pltfm: SDHCI platform and OF driver helper
mmc0: no vqmmc regulator found
mmc0: no vmmc regulator found
mmc0: SDHCI controller on 2194000.usdhc [2194000.usdhc] using ADMA
mmc1: no vqmmc regulator found
mmc1: no vmmc regulator found
mmc1: SDHCI controller on 219c000.usdhc [219c000.usdhc] using ADMA
mmc0: new high speed SDHC card at address e624
mmcblk0: mmc0:e624 SS08G 7.40 GiB
mmcblk0: p1
mmc1: BKOPS_EN bit is not set
usb 1-1: new high-speed USB device number 2 using ci_hdrc
mmc1: new high speed DDR MMC card at address 0001
mmcblk1: mmc1:0001 008G92 7.28 GiB
mmcblk1boot0: mmc1:0001 008G92 partition 1 4.00 MiB
mmcblk1boot1: mmc1:0001 008G92 partition 2 4.00 MiB
mmcblk1rpmb: mmc1:0001 008G92 partition 3 512 KiB
mmcblk1: p1
mmcblk1boot1: unknown partition table
mmcblk1boot0: unknown partition table
hub 1-1:1.0: USB hub found
hub 1-1:1.0: 4 ports detected
Galcore version 4.6.9.9754
mxc_vdoa 21e4000.vdoa: i.MX Video Data Order Adapter(VDOA) driver probed
mxc_asrc 2034000.asrc: mxc_asrc registered
mxc_vpu 2040000.vpu: VPU initialized
leds-gpio gpio-leds.20: pins are not configured from the driver
caam 2100000.caam: device ID = 0x0a16010000000000 (Era -524)
caam 2100000.caam: job rings = 2, qi = 0
caam 2100000.caam: authenc-hmac-md5-cbc-aes-caam
caam 2100000.caam: authencesn-hmac-md5-cbc-aes-caam
caam 2100000.caam: authenc-hmac-sha1-cbc-aes-caam
caam 2100000.caam: authencesn-hmac-sha1-cbc-aes-caam
caam 2100000.caam: authenc-hmac-sha224-cbc-aes-caam
caam 2100000.caam: authencesn-hmac-sha224-cbc-aes-caam
caam 2100000.caam: authenc-hmac-sha256-cbc-aes-caam
caam 2100000.caam: authencesn-hmac-sha256-cbc-aes-caam
caam 2100000.caam: authenc-hmac-md5-cbc-des3_ede-caam
caam 2100000.caam: authencesn-hmac-md5-cbc-des3_ede-caam
caam 2100000.caam: authenc-hmac-sha1-cbc-des3_ede-caam
caam 2100000.caam: authencesn-hmac-sha1-cbc-des3_ede-caam
caam 2100000.caam: authenc-hmac-sha224-cbc-des3_ede-caam
caam 2100000.caam: authencesn-hmac-sha224-cbc-des3_ede-caam
caam 2100000.caam: authenc-hmac-sha256-cbc-des3_ede-caam
caam 2100000.caam: authencesn-hmac-sha256-cbc-des3_ede-caam
caam 2100000.caam: authenc-hmac-md5-cbc-des-caam
caam 2100000.caam: authencesn-hmac-md5-cbc-des-caam
caam 2100000.caam: authenc-hmac-sha1-cbc-des-caam
caam 2100000.caam: authencesn-hmac-sha1-cbc-des-caam
caam 2100000.caam: authenc-hmac-sha224-cbc-des-caam
caam 2100000.caam: authencesn-hmac-sha224-cbc-des-caam
caam 2100000.caam: authenc-hmac-sha256-cbc-des-caam
caam 2100000.caam: authencesn-hmac-sha256-cbc-des-caam
caam 2100000.caam: ecb-des-caam
caam 2100000.caam: ecb-arc4-caam
caam 2100000.caam: ecb-aes-caam
caam 2100000.caam: ctr-aes-caam
caam 2100000.caam: cbc-aes-caam
caam 2100000.caam: ecb-des3-caam
caam 2100000.caam: cbc-3des-caam
caam 2100000.caam: cbc-des-caam
caam 2100000.caam: fsl,sec-v4.0 algorithms registered in /proc/crypto
platform 2101000.jr0: registering rng-caam
platform caam_sm: caam_sm_test: 8-byte key test match OK
platform caam_sm: caam_sm_test: 16-byte key test match OK
platform caam_sm: caam_sm_test: 32-byte key test match OK
platform caam_secvio.25: security violation service handlers armed
usbcore: registered new interface driver usbhid
usbhid: USB HID core driver
i2c-core: driver [cs42888] using legacy suspend method
i2c-core: driver [cs42888] using legacy resume method
TCP: cubic registered
NET: Registered protocol family 10
sit: IPv6 over IPv4 tunneling driver
NET: Registered protocol family 17
can: controller area network core (rev 20120528 abi 9)
NET: Registered protocol family 29
can: raw protocol (rev 20120528)
can: broadcast manager protocol (rev 20120528 t)
can: netlink gateway (rev 20130117) max_hops=1
8021q: 802.1Q VLAN Support v1.8
Key type dns_resolver registered
VFP support v0.3: implementor 41 architecture 3 part 30 variant 9 rev 4
input: gpio-keys.19 as /devices/soc0/gpio-keys.19/input/input0
snvs_rtc 20cc034.snvs-rtc-lp: setting system clock to 1970-01-01 00:00:00 UTC (0)
ALSA device list:
No soundcards found.
EXT4-fs (mmcblk0p1): recovery complete
EXT4-fs (mmcblk0p1): mounted filesystem with ordered data mode. Opts: (null)
VFS: Mounted root (ext4 filesystem) on device 179:1.
devtmpfs: mounted
Freeing unused kernel memory: 264K (80be8000 - 80c2a000)
----------mount all…
----------Starting mdev…

Please press Enter to activate this console.

至此，LCD驱动的移植工作就完成了。

最后

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