2020年12月29日 | I.MX6Q(TQIMX6Q/TQE9)学习笔记——新版BSP之LCD移植

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