DragonBoard™ 410c based on Qualcomm Snapdragon™ 410E processor DSI Display Porting Guide
LM80-P0436-4
Qualcomm Technologies, Inc.
DragonBoard’ 410c based on Qualcomm Snapdragon...
Section 2.3 to Section 2.7 provides instructions for porting the display driver View
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Document DEVICE REPORTlm80-p0436-4 dsi display porting guideQualcomm Technologies, Inc.
DragonBoardTM 410c based on Qualcomm® SnapdragonTM 410E processor DSI Display Porting Guide
LM80-P0436-4 Rev D September 2016
© 2015-2016 Qualcomm Technologies, Inc. All rights reserved. MSM and Qualcomm Snapdragon are products of Qualcomm Technologies, Inc. Other Qualcomm products referenced herein are products of Qualcomm Technologies, Inc. or its other subsidiaries. DragonBoard, MSM, Qualcomm and Snapdragon are trademarks of Qualcomm Incorporated, registered in the United States and other countries. Other product and brand names may be trademarks or registered trademarks of their respective owners. This technical data may be subject to U.S. and international export, re-export, or transfer ("export") laws. Diversion contrary to U.S. and international law is strictly prohibited. Use of this document is subject to the license set forth in Exhibit 1.
Questions or comments: https://www.96boards.org/DragonBoard410c/forum Qualcomm Technologies, Inc. 5775 Morehouse Drive San Diego, CA 92121 U.S.A. LM80-P0436-4 Rev D
Revision history
Revision D C B A
Date September 2016
June 16, 2015 May 22, 2015 April 22, 2015
Description Updated to `E' part. Miscellaneous updates. Updated Revision history and © date. Initial release.
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Contents
1 Introduction ........................................................................................................................... 4
1.1 Purpose .....................................................................................................................................................4 1.2 Conventions...............................................................................................................................................4 1.3 Acronyms...................................................................................................................................................4 1.4 Additional information ................................................................................................................................5
2 Display Driver Porting Procedures ...................................................................................... 6
2.1 Download the display component driver ....................................................................................................6 2.2 Generate DTSI file for kernel and LK .........................................................................................................7
2.2.1 Bring up LK...............................................................................................................................7 2.2.2 Input LCD panel parameters in .xml file....................................................................................8 2.2.3 Calculate DSI PHY timings register .......................................................................................... 9 2.3 Input backlight control parameters ...........................................................................................................11 2.4 Set up DSI panel-related GPIO pins ........................................................................................................12 2.5 Add the panel device tree to the platform DTS file...................................................................................13 2.6 Add panel driver header file and detect panel ID in LK ............................................................................13 2.7 Rebuild images, flash, and debug through adb........................................................................................15
EXHIBIT 1.................................................................................................................................16
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1 Introduction
1.1 Purpose
This document describes how to port the Linux Android display driver for MIPI DSI display panel onto Qualcomm® SnapdragonTM 410E processor using DragonBoard 410c development board. DragonBoardTM 410c has MIPI DSI interface exposed through the high speed Expansion Connector on the board.
1.2 Conventions
Function declarations, function names, type declarations, and code samples appear in a different font, e.g., #include.
Code variables appear in angle brackets, e.g., <number>.
Commands to be entered appear in a different font, e.g., copy a:*.* b:.
Button and key names appear in bold font, e.g., click Save or press Enter.
If you are viewing this document using a color monitor, or if you print this document to a color printer, red boldface indicates code that is to be added, and blue strikethrough indicates code that is to be replaced or removed.
1.3 Acronyms
Acronym
CLK CMD DCS D-PHY DSI DTS GCDB GPIO HS HW IC LCD LK MDP
Definition
Click Command Digital Cellular System Display Serial Interface Physical Layer Display Serial Interface Digital Test Sequence Global Component Database General Purpose Input/Output High Speed Hardware Integrated Circuit Liquid Crystal Display Little Kernel Mobile Display Processor
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DragonBoardTM 410c based on Qualcomm® SnapdragonTM 410E processor DSI Display Porting Guide
Acronym
MDSS MIPI OEM PHY PMIC PWM TE XML
Definition
Multimedia Display Sub-System Mobile Industry Processor Interface Original Equipment Manufacturer Physical Layer Power Management Integrated Circuit Pulse Width Modulation Terminal Emulator eXtensible Markup Language
1.4 Additional information
For additional information, go to http://www.96boards.org/db410c-getting-started/ .
Introduction
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2 Display Driver Porting Procedures
This chapter describes how to port the DSI driver into the Little Kernel (LK) and the Android kernel. Section 2.1 provides information on where to download the display driver. Section 2.2 describes how a DTSI and panel file can be manually generated per the XML input parameters from the display vendor. Section 2.3 to Section 2.7 provides instructions for porting the display driver.
NOTE: See the display vendor's specification for driver IC, bridge IC, etc., details before porting.
2.1 Download the display component driver
1. The reference panel driver can be found on the Codeaurora website. Here are the Codeaurora links https://www.codeaurora.org/cgit/external/thundersoft/ihvjointlab/gcdb-kernel/tree/display/ -- Kernel Space support https://www.codeaurora.org/cgit/external/thundersoft/ihvjointlab/gcdb-userspace/tree/display/ -- User Space support Download the relevant Kernel/User Space driver code patches and apply them in relevant repositories, e.g: In Kernel space:
cd $ANDROID_BUILD_TOP/kernel patch -p1 < 0001-ARM-dts-msm-support-truly-hx8379_a-devicetree.patch
In LK Bootloader:
cd $ANDROID_BUILD_TOP/ bootable/bootloader/lk patch -p1 < 0001-bootloader-lk-add-lcd-truly-hx8379_a.patch
NOTE: These are the reference patches. These may not apply directly on all the release code bases at all time. The user will have to resolve the conflicts (see Section 2.6).
2. Obtain the following information in preparation for DSI bringup: Display specification, including parameters. Display power-on sequence and signal duration for GPIO pins, e.g., RESET/IOVDD. DSI initial command sequence and duration information. bitclk, to reach the fps target number.
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2.2 Generate DTSI file for kernel and LK
The Global Component Database (GCDB) supported on APQ8016E chipsets allows the panel DTSI and LK panel header file to be generated according to the XML input parameters from the panel vendors. 1. Update the device tree parameters. The GCDB source is located in the
device/qcom/common/display/tools folder; the device tree parameters detail description is present at kernel\Documentation\devicetree\bindings\fb\mdss-dsipanel.txt. 2. Use the GCDB translate command to generate the DTSI and LK panel header files:
perl parser.pl <source xml file OEM edit> panel
For example:
#perl parser.pl panel_<vendor>_720p_video.xml panel
It generates dsi-panel-<vendor>-720p-video.dtsi and panel_<vendor>_720p_video.h files.
2.2.1 Bring up LK
NOTE: It is recommended to first bring up the panel in kernel.
1. Update Android Kernel by copying the panel driver DTSI file to the kernel/arch/arm64/boot/dts/qcom folder.
2. Update LK by copying the panel driver header file to the bootable/bootloader/lk/dev/gcdb/display/include/ folder.
3. Bring up the panel in the Android Kernel. 4. Disable the LK display and the continuous splash display.
a. To disable the continuous splash display, change DISPLAY_SPLASH_SCREEN to 0 at bootable/bootloader/lk/target/msm8916/rules.mk. Then continue to bring up in LK.
b. Update the target_cont_splash_screen function at
bootable/bootloader/lk/target/msm8916/init.c. For example: static uint8_t splash_override; /* Returns 1 if target supports continuous splash screen. */ int target_cont_splash_screen() {
uint8_t splash_screen = 0; if(!splash_override) {
switch(board_hardware_id()) {
case HW_PLATFORM_MTP: case HW_PLATFORM_QRD:
dprintf(SPEW, "Target_cont_splash=1\n");
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splash_screen = 1; // Change to "0" to disable continous splash screen
break; default: dprintf(SPEW, "Target_cont_splash=0\n"); splash_screen = 0; } } return splash_screen; }
5. Disable the continuous splash screen at msm8xxx-cdp.dts file.
&dsi_<vendor>_720p_video{
//
qcom,cont-splash-enabled; // Disable continous splash screen
}003B
};
2.2.2 Input LCD panel parameters in .xml file
Update the .xml file with the panel parameters from the LCD vendor. In the following example, red font indicates the panel parameters to be updated.
<!-- Panel configuration --> <PanelType>0</PanelType> // 0 stands for video mode panel, 1 stands for command mode panel <PanelFrameRate>60</PanelFrameRate>
<!-- Panel Resolution --> <PanelWidth>720</PanelWidth> <PanelHeight>1280</PanelHeight> <HFrontPorch>140</HFrontPorch> <HBackPorch>164</HBackPorch> <HPulseWidth>8</HPulseWidth> <HSyncSkew>0</HSyncSkew> <VBackPorch>4</VBackPorch> <VFrontPorch>8</VFrontPorch> <VPulseWidth>4</VPulseWidth>
<!-- Panel Color Information --> <ColorFormat>24</ColorFormat> // 24bpp
<!-- Panel Command information --> <OnCommand>"0x29, 0x01, 0x00, 0x00, 0x00, 0x00, 0x02, 0xFF, 0xEE,
0x29, 0x01, 0x00, 0x00, 0x00, 0x00, 0x02, 0xFB, 0x01, ... ... ...
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0x29, 0x01, 0x00, 0x00, 0x78, 0x00, 0x02, 0x29, 0x00" </OnCommand> // add your panel on commands from LCD vendor
<OffCommand>"0x05, 0x01, 0x00, 0x00, 0x32, 0x00, 0x02, 0x28, 0x00, ... ... ... 0x05, 0x01, 0x00, 0x00, 0x78, 0x00, 0x02, 0x10, 0x00"
</OffCommand> // add your panel off commands from LCD vendor
<OnCommandState>0</OnCommandState> // 0 stands for lp mode <OffCommandState>1</OffCommandState> // 1 stands for hs mode
<!-- Video mode panel information --> <HSyncPulse>1</HSyncPulse> <BLLPEOFPowerMode>1</BLLPEOFPowerMode> <BLLPPowerMode>1</BLLPPowerMode> <TrafficMode>2</TrafficMode>
<!-- Panel Reset Sequence --> <ResetSequence>
<PinState1>1</PinState1> <PulseWidth1>20</PulseWidth1> <PinState2>0</PinState2> <PulseWidth2>2</PulseWidth2> <PinState3>1</PinState3> <PulseWidth3>20</PulseWidth3> </ResetSequence>
2.2.3 Calculate DSI PHY timings register
The D-PHY auto calculation spreadsheet (click the paperclip icon on the left of the PDF screen to open the file) is used to calculate the DSI PHY timing settings; this spreadsheet is intended for the MSM8x16 chipset, which uses the DSI6G DSI host design. 1. On the DSI and MDP registers worksheet, enter the panel resolution, porch values,
fps, color depth, and lane numbers into the fields shown.
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2. The DSI-related clock rate is calculated using the DSI PHY timing setting worksheet. An invalid value appears in the Check for T_CLK_ZERO field. Press CTRL+J and CTRL+K to recalculate T_CLK_ZERO to a valid value.
The panel requires PHY value setup for bitclk in the DSI PHY register.
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3. Input the panel timings value in the .xml file.
<!-- Panel Timing --> <PanelTimings>"0xDA, 0x34, 0x24, 0x00, 0x64, 0x68,
0x28, 0x38, 0x2A, 0x03, 0x04, 0x00"</PanelTimings> <TClkPost>0x03</TClkPost> <TClkPre>0x41</TClkPre>
NOTE: DSIPHY_TIMING_CTRL_3 is 0x00. DSIPHY_TIMING_CTRL_11 is used for the DSI secondary display; it is not necessary to modify it if there is no DSI secondary panel.
2.2.3.1 Set DSI clock to HS mode
Certain panels must be set to force_clk_lane_hs to send commands in HS mode. At kernel/drivers/video/msm/mdss/mdss_dsi.c file, on mdss_dsi_onfunction. For example,
mipi->force_clk_lane_hs= 1; if(mipi->force_clk_lane_hs) { u32tmp; tmp= MIPI_INP((ctrl_pdata->ctrl_base) + 0xac); tmp|= (1<<28); MIPI_OUTP((ctrl_pdata->ctrl_base) + 0xac, tmp); wmb(); }
2.3 Input backlight control parameters
Three methods used to control backlight are: "bl_ctrl_pwm" = Backlight controlled by PWM GPIO "bl_ctrl_wled" = Backlight controlled by WLED
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"bl_ctrl_dcs" = Backlight control by DCS commands If WLED is used to control the backlight, input the backlight parameters in the .xml file:
<!-- Backlight --> <BLInterfaceType>1</BLInterfaceType> <BLMinLevel>1</BLMinLevel> <BLMaxLevel>4095</BLMaxLevel> <BLStep>100</BLStep> <BLPMICModel>"PMIC_8xxx"</BLPMICModel> <BLPMICControlType>1</BLPMICControlType> // 1 stands for Backlight controlled by WLED.
The DCS backlight control is selected at the panel side. The backlight control is highly related to hardware configuration/schematics. If the backlight uses a third-party backlight driver IC, or the schematics is changed from the QTI reference schematics, modify the software to add backlight control routines. The default backlight entry function is used in mdss_fb.c (do not modify).
2.4 Set up DSI panel-related GPIO pins
1. Input GPIO pins parameter in platform-8xxx.xml file. The information about setting up DSI panel-related GPIO reset pins can be found at arch/arm/boot/dts/qcom/msm8xxx-mdss.dts.The GPIO parameters are entered in the .xml file at device/qcom/common/display/tools/platform-8xxx.xml. For example,
<PlatformId>"msm8xxx"</PlatformId> <!-- GPIO configuration --> <ResetGPIO>
<PinSource>"msmgpio"</PinSource> <PinId>25</PinId> <PinStrength>3</PinStrength> <PinDirection>1</PinDirection> <PinPull>0</PinPull> <PinState>1</PinState> </ResetGPIO>
<EnableGPIO> <PinSource>"msmgpio"</PinSource> <PinId>32</PinId> <PinStrength>3</PinStrength> <PinDirection>1</PinDirection> <PinPull>0</PinPull> <PinState>1</PinState>
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For the TE GPIO and backlight GPIO using DCS backlight control, see the platform MDSS DSI parameters description at kernel/Documentation/devicetree/bindings/fb/mdss-dsi-
ctrl.txt.
For pin definitions, see the parameter details at /arch/arm/boot/dts/qcom/msm8xxxpinctrl.dtsi.
Any LCD module-specific reset sequences beyond QTI's default release software should be handled by the QEM. In general, the default release software should cover most use cases.
2.5 Add the panel device tree to the platform DTS file
Modify the msm8xxx-qrd.dts at arch/arm/boot/dts/qcom/ by adding the panel device tree. For example,
/include/ "dsi-panel-<vendor>-720p-video.dtsi"
&mdss_mdp { qcom,mdss-pref-prim-intf = "dsi";
};
&mdss_pinmux { };
qcom,num-grp-pins = <3>; qcom,pins = <&gp 32>, <&gp 25>, <&gp 97>;
&mdss_dsi0 { qcom,dsi-pref-prim-pan = <&dsi_<vendor>_720p_video>; pinctrl-names = "default", "sleep"; pinctrl-0 = <&mdss_dsi_active>; pinctrl-1 = <&mdss_dsi_suspend>;
2.6 Add panel driver header file and detect panel ID in LK
1. Add the panel header file to bootable/bootloader/lk/target/msm8xxx/oem_panel.c. For example,
#include "include/panel_toshiba_720p_video.h" #include "include/panel_nt35590_720p_video.h" #include "include/panel_nt35590_720p_cmd.h" #include "include/panel_hx8394a_720p_video.h" +#include "include/panel_nt35521_720p_video.h"
2. Add the <vendor>_<resolution>_VIDEO_PANEL parameter to the enum.
enum {
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TOSHIBA_720P_VIDEO_PANEL, NT35590_720P_CMD_PANEL, NT35590_720P_VIDEO_PANEL, HX8394A_720P_VIDEO_PANEL, +NT35521_720P_VIDEO_PANEL, UNKNOWN_PANEL };
3. Add the <vendor>_<resolution>_VIDEO_PANEL parameter to the panel_list_supp_panels struct.
static struct panel_list supp_panels[] = { {"toshiba_720p_video", TOSHIBA_720P_VIDEO_PANEL}, {"nt35590_720p_cmd", NT35590_720P_CMD_PANEL}, {"nt35590_720p_video", NT35590_720P_VIDEO_PANEL}, {"hx8394a_720p_video", HX8394A_720P_VIDEO_PANEL}, +{"nt35521_720p_video", NT35521_720P_VIDEO_PANEL}, };
4. Add the <vendor>_<resolution>_VIDEO_PANEL case to the init_panel_data function.
static void init_panel_data(struct panel_struct *panelstruct,
struct msm_panel_info *pinfo,
struct mdss_dsi_phy_ctrl *phy_db)
{
switch (panel_id) {
+case NT35521_720P_VIDEO_PANEL:
+ panelstruct->paneldata = &nt35521_720p_video_panel_data;
+ panelstruct->panelres
= &nt35521_720p_video_panel_res;
+ panelstruct->color
= &nt35521_720p_video_color;
+ panelstruct->videopanel = &nt35521_720p_video_video_panel;
+ panelstruct->commandpanel = &nt35521_720p_video_command_panel;
+ panelstruct->state
= &nt35521_720p_video_state;
+ panelstruct->laneconfig = &nt35521_720p_video_lane_config;
+ panelstruct->paneltiminginfo
= &nt35521_720p_video_timing_info;
+ panelstruct->panelresetseq
= &nt35521_720p_video_panel_reset_seq;
+ panelstruct->backlightinfo = &nt35521_720p_video_backlight;
+ pinfo->mipi.panel_cmds
= nt35521_720p_video_on_command;
+ pinfo->mipi.num_of_panel_cmds
= NT35521_720P_VIDEO_ON_COMMAND;
+ memcpy(phy_db->timing,
nt35521_720p_video_timings, TIMING_SIZE);
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break;
5. Select the panel ID according to hw_id in the oem_panel_select function.
enum target_subtype { HW_PLATFORM_SUBTYPE_SKUAA = 0, HW_PLATFORM_SUBTYPE_SKUF = 1, HW_PLATFORM_SUBTYPE_SKUAB = 2, HW_PLATFORM_SUBTYPE_SKUG = 3, +HW_PLATFORM_SUBTYPE_720P = 5,
};
switch (hw_id) {
case HW_PLATFORM_MTP: case HW_PLATFORM_QRD:
if (hw_subtype == HW_PLATFORM_SUBTYPE_720P) + panel_id = NT35521_720P_VIDEO_PANEL; else
panel_id = nt35590_panel_id; break; default: dprintf(CRITICAL, "Display not enabled for %d HW type\n"
, hw_id); return false;
2.7 Rebuild images, flash, and debug through adb
1. Rebuild the software. 2. Flash the emmc_appsboot.mbn and boot.img files onto the device. 3. Verify that the panel is lighted. If not, check the panel initialization commands, reset
sequence, and measure the signal for DSI clock lane and data lane, etc. 4. If there is no DSI Clock output, check the DSI-related clocks using adb commands.
a. adb root b. adb remount c. adb shell d. #mount t debugfs none /sys/kernel/debug e. #cd /sys/kernel/debug/clk/dsi1_byte_clk f. #cat measure
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unenforceable, the remaining provisions shall remain in full force and effect. This Agreement is entered into solely in the English language, and
if for any reason any other language version is prepared by any party, it shall be solely for convenience and the English version shall govern and
control all aspects. If You are located in the province of Quebec, Canada, the following applies: The Parties hereby confirm they have requested
this Agreement and all related documents be prepared in English.
LM80-P0436-4 Rev D
MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION
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Microsoft Word 2013