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这期内容当中小编将会给大家带来有关RK3288如何增加双屏异显 eDP+LVDS，文章内容丰富且以专业的角度为大家分析和叙述，阅读完这篇文章希望大家可以有所收获。
CPU：RK3288
系统：Android 5.1
下面是官方文档中的信息。
1、rk3288 支持的显示接口可以任意组合。
2、双屏异显时，一个显示接口当主屏，另一个当副屏；主副屏由板级 dts 文件确定，启动后无法动态更改。
3、当两路显示接口显示不同分辨率时，rk3288 只能为一路显示接口提供精确时钟，另一路显示接口时钟会有微小频偏。
瑞芯微虽然提供了 Android 5.1 的补丁，但是本人在移植过程中出现一些问题（打补丁最好一行行核对，不要图方便直接使用指令）。
设备 eDP 为主屏，lvds 为副屏。
（1）首先修改两个屏参文件 lcd-xxx.dtsi。
eDP 屏参文件补丁
diff --git a/kernel/arch/arm/boot/dts/lcd-NV116FH1.dtsi b/kernel/arch/arm/boot/dts/lcd-NV116FH1.dtsi
index 3862b05..7bf992f 100755
--- a/kernel/arch/arm/boot/dts/lcd-NV116FH1.dtsi
+++ b/kernel/arch/arm/boot/dts/lcd-NV116FH1.dtsi
@@ -3,11 +3,9 @@
*
*/
-/ {
-
- disp_timings: display-timings {
- native-mode = <&timing0>;
- timing0: timing0 {
+ display-timings {
+ native-mode = <&nv116fhm>;
+ nv116fhm: timing0 {
screen-type =
out-face =
clock-frequency = <205000000>;
@@ -30,4 +30,3 @@
swap-gb = <0>;
};
};
-};
lvds 屏参文件补丁
diff --git a/kernel/arch/arm/boot/dts/lcd-ZJ080NA-08A.dtsi b/kernel/arch/arm/boot/dts/lcd-ZJ080NA-08A.dtsi
old mode 100644
new mode 100755
index fc6385c..58f999be
--- a/kernel/arch/arm/boot/dts/lcd-ZJ080NA-08A.dtsi
+++ b/kernel/arch/arm/boot/dts/lcd-ZJ080NA-08A.dtsi
@@ -3,11 +3,10 @@
*
*/
-/ {
- disp_timings: display-timings {
- native-mode = <&timing0>;
- timing0: timing0 {
+ display-timings {
+ native-mode = <&zj080na>;
+ zj080na: timing0 {
screen-type =
lvds-format =
out-face =
@@ -30,4 +30,3 @@
swap-gb = <0>;
};
};
-};
（2）根据官方提供，打上 kernel 补丁
kernel 补丁
（3）根据官方提供，打上 hardware 补丁
hardware 补丁
（4）根据官方提供，打上 framework 补丁
framework 补丁
（5）官方提供的补丁打完了，但是此时编译可能会报错，如下：
cts/tests/tests/view/src/android/view/cts/WindowTest.java:846: error: WindowTest.MockWindow is not abstract and does not override abstract method moveExtendDisplay() in Window
public class MockWindow extends Window {
^
Note: Some input files use or override a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
1 error
make: *** [out/target/common/obj/APPS/CtsViewTestCases_intermediates/classes-full-debug.jar] Error 41
make: *** Waiting for unfinished jobs....
Note: Some input files use or override a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
Note: Some input files use unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
Note: Some input files use or override a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
Note: Some input files use unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
Warning: AndroidManifest.xml already defines minSdkVersion (in http://schemas.android.com/apk/res/android); using existing value in manifest.
Warning: AndroidManifest.xml already defines targetSdkVersion (in http://schemas.android.com/apk/res/android); using existing value in manifest.
#### make failed to build some targets (03:55 (mm:ss)) ####
根据编译错误提示，需要修改 cts/tests/tests/view/src/android/view/cts/WindowTest.java 文件。
diff --git a/cts/tests/tests/view/src/android/view/cts/WindowTest.java b/cts/tests/tests/view/src/android/view/cts/WindowTest.java
index 3c5386d..8732ae7 100755
--- a/cts/tests/tests/view/src/android/view/cts/WindowTest.java
+++ b/cts/tests/tests/view/src/android/view/cts/WindowTest.java
@@ -998,6 +998,19 @@ public class WindowTest extends ActivityInstrumentationTestCase2 } @Override + public void moveAppToDisplay(int id) { + } + + @Override + public void syncDualDisplay() { + } + + @Override + public void moveExtendDisplay() { + } + + + @Override public void setDefaultWindowFormat(int format) { super.setDefaultWindowFormat(format); } （6）此时可以编译成功，在屏参正确的前提下，主屏显示正常，副屏出现花屏，需要在 system.prop 里添加属性 ro.htg.force=1。 diff --git a/device/rockchip/rk3288/system.prop b/device/rockchip/rk3288/system.prop index 26a2b09..c4f2c3d 100755 --- a/device/rockchip/rk3288/system.prop +++ b/device/rockchip/rk3288/system.prop @@ -12,6 +12,7 @@ rild.libpath=/system/lib/libril-rk29-dataonly.so rild.libargs=-d /dev/ttyACM0 persist.tegra.nvmmlite = 1 ro.audio.monitorOrientation=true +ro.htg.force=1 #NFC debug.nfc.fw_download=false 此时大功告成，双屏可以正常显示，也可以实现双屏异显。 如果 lcd 出现重复性黑屏亮屏，找到对应的屏参文件，在正常范围内调节频率 clk 值即可。 display-timings { native-mode = <&ee101ia>; ee101ia: timing0 { screen-type = lvds-format = out-face = color-mode = // 调节 lcd 频率 clock-frequency = <148500000>; hactive = <1920>; vactive = <1080>; 如果单屏调试都正常点亮，打补丁后，点不亮或者有花屏现象，尝试增大对应屏的电源使能延时 lcd_en { rockchip,power_type = gpios = <&gpio7 GPIO_A5 GPIO_ACTIVE_HIGH>; - rockchip,delay = <10>; + rockchip,delay = <100>; }; 上述就是小编为大家分享的RK3288如何增加双屏异显 eDP+LVDS了，如果刚好有类似的疑惑，不妨参照上述分析进行理解。如果想知道更多相关知识，欢迎关注创新互联-成都网站建设公司行业资讯频道。
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