1.確定系統所使用的dts

串口打印:Machine: Qualcomm Technologies, Inc. APQ 8098 SKUK HDK
推測出所用的dts為apq8098-v2-qrd-skuk-hdk.dts
生成的是apq8098-v2-qrd-skuk-hdk.dtb
確定了所用的dts為kernel/msm-4.4/arch/arm/boot/dts/qcom/apq8098-v2-qrd-skuk-hdk.dts

#include "apq8098-v2.dtsi" #include "msm8998-mdss-panels.dtsi" #include "msm8998-qrd-skuk-hdk.dtsi"/ {model = "Qualcomm Technologies, Inc. APQ 8098 SKUK HDK bshui";compatible = "qcom,msm8998-qrd", "qcom,msm8998", "qcom,qrd";qcom,board-id = <0x06000b 0x10>; };參考:kernel/msm-4.4/Documentation/devicetree/bindings/arm/msm/msm.txtSOC Type(qcom,msm8998-qrd) QRD device:qcom,qrd

所使用的屏
屏:kernel/msm-4.4/arch/arm/boot/dts/qcom/msm8998-mdss-panels.dtsi
顯示屏為三星AMOLED屏
基本參數:
Resolution:1440x2560
5.5’ 2x4 lane MIPI DSI

２.AMOLED屏

AMOLED（Active Matrix/Organic Light Emitting Diode）主動矩陣有機發光二極體面板（AMOLED）被稱為下一代顯示技術，包括三星電子、三星SDI、LG飛利浦都十分重視這項新的顯示技術
AMOLED屏幕是單個像素點發光
AMOLED屏幕的構造有三層，AMOLED顯示屏幕、觸摸感應面板跟外面保護的那層玻璃。Super AMOLED少了中間那層觸摸感應面板，而把觸摸感應層做在AMOLED顯示層上了。Super AMOLED面板比AMOLED屏幕更薄，而且就是原生的觸控面板
通過cmdline獲取panel型號的dtsi文件節點(qcom,lcd,id)
高通是通過讀取panel的id來確定當前使用的panel型號,將panel的型號放在cmdline里面
mdss_mdp.panel=1:dsi:0:qcom,mdss_dsi_s6e3ha3_amoled_wqhd_cmd:config0:1:qcom,
mdss_dsi_s6e3ha3_amoled_wqhd_cmd:config0:cfg:split_dsi

mdss_dsi_s6e3ha3_amoled_wqhd_cmd這個是我們需要找的
在內核里通過cmdline尋找panel的dtsi文件節點獲取屬性

３.dtsi 文件

找到所用的文件為arch/arm/boot/dts/qcom/dsi-panel-s6e3ha3-amoled-dualmipi-wqhd-cmd.dtsi
被arch/arm/boot/dts/qcom/msm8998-mdss-panels.dtsi引用

&dsi_dual_s6e3ha3_amoled_cmd {qcom,mdss-dsi-panel-timings = [00 1c 06 06 0b 10 06 07 05 03 04 00];//時序設置qcom,mdss-dsi-t-clk-post = <0x07>;qcom,mdss-dsi-t-clk-pre = <0x2a>; }; ----------------------------------------------------------------------------- cat dsi-panel-s6e3ha3-amoled-dualmipi-wqhd-cmd.dtsi &mdss_mdp {dsi_dual_s6e3ha3_amoled_cmd: qcom,mdss_dsi_s6e3ha3_amoled_wqhd_cmd{qcom,mdss-dsi-panel-name ="Dual s6e3ha3 amoled cmd mode dsi panel";　//用作面板描述名稱的字符串qcom,mdss-dsi-panel-type = "dsi_cmd_mode";//啟用命令模式dsi_video_mode 啟用視頻模式qcom,mdss-dsi-panel-framerate = <60>;//指定面板的幀率每秒60幀qcom,mdss-dsi-virtual-channel-id = <0>;//指定虛擬頻道標識符qcom,mdss-dsi-stream = <0>;//指定要使用的數據包流qcom,mdss-dsi-panel-width = <720>;//指定面板寬度單位像素qcom,mdss-dsi-panel-height = <2560>;//指定面板高度qcom,mdss-dsi-h-front-porch = <100>;//水平前沿值qcom,mdss-dsi-h-back-porch = <100>;//水平后沿值qcom,mdss-dsi-h-pulse-width = <40>;//水平脈沖寬度qcom,mdss-dsi-h-sync-skew = <0>;//水平同步傾斜值qcom,mdss-dsi-v-back-porch = <31>;//垂直后沿值qcom,mdss-dsi-v-front-porch = <30>;//垂直前沿值qcom,mdss-dsi-v-pulse-width = <8>;//垂直脈沖寬度qcom,mdss-dsi-h-left-border = <0>;//水平左邊框qcom,mdss-dsi-h-right-border = <0>;//水平右邊框qcom,mdss-dsi-v-top-border = <0>;//垂直上邊框qcom,mdss-dsi-v-bottom-border = <0>;//垂直下邊框qcom,mdss-dsi-bpp = <24>;//指定面板的每像素位數24=rgb888qcom,mdss-dsi-underflow-color = <0xff>;qcom,mdss-dsi-border-color = <0>;//如有邊框，定義邊框顏色值qcom,mdss-dsi-color-order = "rgb_swap_rgb";qcom,mdss-dsi-on-command = [05 01 00 00 05 00 02 11 00　//mipi dsi 命令39 01 00 00 00 00 05 2a 00 00 05 9f39 01 00 00 00 00 05 2b 00 00 09 ff39 01 00 00 00 00 03 f0 5a 5a39 01 00 00 00 00 02 b0 1039 01 00 00 00 00 02 b5 a039 01 00 00 00 00 02 c4 0339 01 00 00 00 00 0af6 42 57 37 00 aa cc d0 00 0039 01 00 00 00 00 02 f9 0339 01 00 00 00 00 14c2 00 00 d8 d8 00 80 2b 05 080e 07 0b 05 0d 0a 15 13 20 1e39 01 00 00 78 00 03 f0 a5 a539 01 00 00 00 00 02 35 0039 01 00 00 00 00 02 53 2039 01 00 00 00 00 02 51 6005 01 00 00 05 00 02 29 00];qcom,mdss-dsi-off-command = [05 01 00 00 3c 00 02 28 0005 01 00 00 b4 00 02 10 00];//面板關閉命令qcom,mdss-dsi-on-command-state = "dsi_lp_mode";//定用于發送 ON 命令的控制狀態的dsi_lp_mode:低功率模式qcom,mdss-dsi-off-command-state = "dsi_hs_mode";//指定用于發送 OFF 命令的控制狀態的dsi_hs_mode:高速模式qcom,mdss-dsi-lp-mode-on = [39 00 00 00 05 00 03 f0 5a 5a39 00 00 00 05 00 03 f1 5a 5a39 00 00 00 05 00 03 fc 5a 5a39 00 00 00 05 00 02 b0 1739 00 00 00 05 00 02 cb 1039 00 00 00 05 00 02 b0 2d39 00 00 00 05 00 02 cb cd39 00 00 00 05 00 02 b0 0e39 00 00 00 05 00 02 cb 0239 00 00 00 05 00 02 b0 0f39 00 00 00 05 00 02 cb 0939 00 00 00 05 00 02 b0 0239 00 00 00 05 00 02 f2 c939 00 00 00 05 00 02 b0 0339 00 00 00 05 00 02 f2 c039 00 00 00 05 00 02 b0 0339 00 00 00 05 00 02 f4 aa39 00 00 00 05 00 02 b0 0839 00 00 00 05 00 02 b1 3039 00 00 00 05 00 02 b0 0939 00 00 00 05 00 02 b1 0a39 00 00 00 05 00 02 b0 0d39 00 00 00 05 00 02 b1 1039 00 00 00 05 00 02 b0 0039 00 00 00 05 00 02 f7 0339 00 00 00 05 00 02 fe 3039 01 00 00 05 00 02 fe b0];qcom,mdss-dsi-lp-mode-off = [39 00 00 00 05 00 03 f0 5a 5a39 00 00 00 05 00 03 f1 5a 5a39 00 00 00 05 00 03 fc 5a 5a39 00 00 00 05 00 02 b0 2d39 00 00 00 05 00 02 cb 4d39 00 00 00 05 00 02 b0 1739 00 00 00 05 00 02 cb 0439 00 00 00 05 00 02 b0 0e39 00 00 00 05 00 02 cb 0639 00 00 00 05 00 02 b0 0f39 00 00 00 05 00 02 cb 0539 00 00 00 05 00 02 b0 0239 00 00 00 05 00 02 f2 b839 00 00 00 05 00 02 b0 0339 00 00 00 05 00 02 f2 8039 00 00 00 05 00 02 b0 0339 00 00 00 05 00 02 f4 8a39 00 00 00 05 00 02 b0 0839 00 00 00 05 00 02 b1 1039 00 00 00 05 00 02 b0 0939 00 00 00 05 00 02 b1 0a39 00 00 00 05 00 02 b0 0d39 00 00 00 05 00 02 b1 8039 00 00 00 05 00 02 b0 0039 00 00 00 05 00 02 f7 0339 00 00 00 05 00 02 fe 3039 01 00 00 05 00 02 fe b0];qcom,mdss-dsi-h-sync-pulse = <0>;//指定面板的脈沖模式選項0 = 不在 vs/ve 數據包之后發送qcom,mdss-dsi-traffic-mode = "non_burst_sync_event";//指定面板流量模式non_burst_sync_event使用同步qcom,mdss-dsi-lane-map = "lane_map_0123";qcom,mdss-dsi-bllp-eof-power-mode;//用于確定低功率空白期bllp-eof模式qcom,mdss-dsi-bllp-power-mode;//bllp power模式qcom,mdss-dsi-tx-eot-append;qcom,dcs-cmd-by-left;qcom,mdss-dsi-lane-0-state;　//指定是否啟用數據通道 0 的布爾值qcom,mdss-dsi-lane-1-state;qcom,mdss-dsi-lane-2-state;qcom,mdss-dsi-lane-3-state;qcom,mdss-dsi-wr-mem-start = <0x2c>;qcom,mdss-dsi-wr-mem-continue = <0x3c>;qcom,mdss-dsi-te-pin-select = <1>;qcom,mdss-dsi-te-dcs-command = <1>;qcom,mdss-tear-check-sync-cfg-height = <2650>;qcom,mdss-dsi-te-using-te-pin;qcom,mdss-dsi-panel-timings =[eb 38 26 00 6a 66 32 3c 2f 03 04 00];//長度為 12 的數組，用于指定面板的PHY 定時設置qcom,mdss-dsi-t-clk-post = <0x2c>;//指定模式切換后的字節時鐘周期qcom,mdss-dsi-t-clk-pre = <0x1c>;//指定模式切換前的字節時鐘周期qcom,mdss-dsi-dma-trigger = "trigger_sw";//指定用于 DMA 路徑的觸發機制trigger_sw由軟件觸發qcom,mdss-dsi-mdp-trigger = "none";//指定用于 MDP 路徑的觸發機制,none=無觸發qcom,mdss-dsi-lp11-init;qcom,mdss-dsi-bl-pmic-control-type = "bl_ctrl_dcs";qcom,mdss-dsi-bl-min-level = <1>;qcom,mdss-dsi-bl-max-level = <255>;qcom,mdss-pan-physical-width-dimension = <68>;qcom,mdss-pan-physical-height-dimension = <122>;qcom,mdss-dsi-reset-sequence = <1 10>, <0 10>, <1 10>;}; };

４.msm顯示系統框架

# ls out/target/product/msm8998/obj/kernel/msm-4.4/drivers/video/fbdev/msm/ built-in.o mdss-dsi.o mdss_mdp_cdm.o mdss_mdp_pp_stub.o dsi_status_6g.o mdss_dsi_panel.o mdss_mdp_ctl.o mdss_mdp_pp_v1_7.o mdss_cec_core.o mdss_dsi_phy.o mdss_mdp_debug.o mdss_mdp_pp_v3.o mdss_compat_utils.o mdss_dsi_phy_v3.o mdss_mdp_intf_cmd.o mdss_mdp_splash_logo.o mdss_dba_utils.o mdss_dsi_status.o mdss_mdp_intf_video.o mdss_mdp_util.o mdss_debug.o mdss_fb.o mdss_mdp_intf_writeback.o mdss_mdp_wfd.o mdss_debug_xlog.o mdss_hdcp_1x.o mdss_mdp_layer.o mdss_panel.o mdss_dp_aux.o mdss_hdmi_audio.o mdss_mdp.o mdss_rotator.o mdss_dp_hdcp2p2.o mdss_hdmi_cec.o mdss-mdp.o mdss_smmu.o mdss_dp.o mdss_hdmi_edid.o mdss_mdp_overlay.o mdss_util.o mdss_dp_util.o mdss_hdmi_hdcp2p2.o mdss_mdp_pipe.o mdss_wb.o mdss_dsi_clk.o mdss_hdmi_panel.o mdss_mdp_pp_cache_config.o modules.builtin mdss_dsi_cmd.o mdss_hdmi_tx.o mdss_mdp_pp_common.o modules.order mdss_dsi_host.o mdss_hdmi_util.o mdss_mdp_pp_debug.o msm_mdss_io_8974.o mdss_dsi.o mdss_io_util.o mdss_mdp_pp.oMDSS軟件驅動mdss_fb.c 頂層IOCTL/native framebuffer接口mdss_mdp.c --MDP（Mobile Development Platforms）資源，包括時鐘/中斷/bus-bw/powermdss_mdp_overlay.c--Overlay/DMA 頂層APImdss_mdp_ctl.c--將（LM，DSPP，Ping-pong，interface）硬件集群mdss_mdp_pipe.c--SRC pipe相關處理mdss_mdp_intf_cmd.c/mdss_mdp_intf_video.c/mdss_mdp_intf_writeback.c--MDP面板接口處理mdss_mdp_pp.c--后處理相關實現mdss_mdp_rotator.c--旋轉API（overlay_set, overlay_playinterface） Linux標準的fb架構沒有MDP這個東西,高通提供了MDSS(multimedia display subsystem)進行管理 高通使用MDP作為顯示處理器,提高了顯示效果,并提供了圖像旋轉,overlay等功能

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