sample.display.lvgl.gui fails to build for stm32f429i_disc1

[stephanosio]

Describe the bug
samples/subsys/display/lvgl/sample.display.lvgl.gui test fails to build for stm32f429i_disc1.

To Reproduce

scripts/twister -v -N -M -p stm32f429i_disc1 -s samples/subsys/display/lvgl/sample.display.lvgl.gui

Expected behavior

Test builds successfully.

Impact
Unclear

Logs and console output

Loading Zephyr default modules (Zephyr base).
-- Application: /__w/zephyr/zephyr/samples/subsys/display/lvgl
-- CMake version: 3.20.5
-- Found Python3: /usr/bin/python3.8 (found suitable exact version "3.8.10") found components: Interpreter 
-- Cache files will be written to: /__w/zephyr/zephyr/.cache
-- Zephyr version: 3.3.0-rc1 (/__w/zephyr/zephyr)
-- Found west (found suitable version "0.14.0", minimum required is "0.7.1")
-- Board: stm32f429i_disc1
-- Found host-tools: zephyr 0.15.2 (/opt/toolchains/zephyr-sdk-0.15.2)
-- Found toolchain: zephyr 0.15.2 (/opt/toolchains/zephyr-sdk-0.15.2)
-- Found Dtc: /opt/toolchains/zephyr-sdk-0.15.2/sysroots/x86_64-pokysdk-linux/usr/bin/dtc (found suitable version "1.6.0", minimum required is "1.4.6") 
-- Found BOARD.dts: /__w/zephyr/zephyr/boards/arm/stm32f429i_disc1/stm32f429i_disc1.dts
-- Generated zephyr.dts: /__w/zephyr/zephyr/twister-out/stm32f429i_disc1/samples/subsys/display/lvgl/sample.display.lvgl.gui/zephyr/zephyr.dts
-- Generated devicetree_generated.h: /__w/zephyr/zephyr/twister-out/stm32f429i_disc1/samples/subsys/display/lvgl/sample.display.lvgl.gui/zephyr/include/generated/devicetree_generated.h
-- Including generated dts.cmake file: /__w/zephyr/zephyr/twister-out/stm32f429i_disc1/samples/subsys/display/lvgl/sample.display.lvgl.gui/zephyr/dts.cmake
Parsing /__w/zephyr/zephyr/Kconfig
Loaded configuration '/__w/zephyr/zephyr/boards/arm/stm32f429i_disc1/stm32f429i_disc1_defconfig'
Merged configuration '/__w/zephyr/zephyr/samples/subsys/display/lvgl/prj.conf'
Configuration saved to '/__w/zephyr/zephyr/twister-out/stm32f429i_disc1/samples/subsys/display/lvgl/sample.display.lvgl.gui/zephyr/.config'
Kconfig header saved to '/__w/zephyr/zephyr/twister-out/stm32f429i_disc1/samples/subsys/display/lvgl/sample.display.lvgl.gui/zephyr/include/generated/autoconf.h'
-- The C compiler identification is GNU 12.1.0
-- The CXX compiler identification is GNU 12.1.0
-- The ASM compiler identification is GNU
-- Found assembler: /opt/toolchains/zephyr-sdk-0.15.2/arm-zephyr-eabi/bin/arm-zephyr-eabi-gcc
-- Configuring done
-- Generating done
CMake Warning:
  Manually-specified variables were not used by the project:

    TC_RUNID


-- Build files have been written to: /__w/zephyr/zephyr/twister-out/stm32f429i_disc1/samples/subsys/display/lvgl/sample.display.lvgl.gui
[1/352] Preparing syscall dependency handling

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[130/352] Building C object zephyr/drivers/display/CMakeFiles/drivers__display.dir/display_ili9xxx.c.obj
FAILED: zephyr/drivers/display/CMakeFiles/drivers__display.dir/display_ili9xxx.c.obj 
ccache /opt/toolchains/zephyr-sdk-0.15.2/arm-zephyr-eabi/bin/arm-zephyr-eabi-gcc -DCORE_CM4 -DHSE_VALUE=8000000 -DKERNEL -DLV_CONF_INCLUDE_SIMPLE=1 -DLV_CONF_PATH=../zephyr/lv_conf.h -DSTM32F429xx -DUSE_FULL_LL_DRIVER -DUSE_HAL_DRIVER -D__PROGRAM_START -D__ZEPHYR_SUPERVISOR__ -D__ZEPHYR__=1 -I../../../../../../../include -Izephyr/include/generated -I../../../../../../../soc/arm/st_stm32/stm32f4 -I../../../../../../../drivers -I../../../../../../../soc/arm/st_stm32/common -I/__w/zephyr/modules/hal/cmsis/CMSIS/Core/Include -I/__w/zephyr/modules/hal/stm32/stm32cube/stm32f4xx/soc -I/__w/zephyr/modules/hal/stm32/stm32cube/stm32f4xx/drivers/include -I/__w/zephyr/modules/hal/stm32/stm32cube/stm32f4xx/drivers/include/Legacy -I/__w/zephyr/modules/hal/stm32/stm32cube/common_ll/include -I/__w/zephyr/modules/lib/gui/lvgl/zephyr/../src -isystem ../../../../../../../lib/libc/minimal/include -isystem /opt/toolchains/zephyr-sdk-0.15.2/arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/12.1.0/include -isystem /opt/toolchains/zephyr-sdk-0.15.2/arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/12.1.0/include-fixed -fno-strict-aliasing -Os -imacros /__w/zephyr/zephyr/twister-out/stm32f429i_disc1/samples/subsys/display/lvgl/sample.display.lvgl.gui/zephyr/include/generated/autoconf.h -ffreestanding -fno-common -g -gdwarf-4 -fdiagnostics-color=always -mcpu=cortex-m4 -mthumb -mabi=aapcs -mfp16-format=ieee --sysroot=/opt/toolchains/zephyr-sdk-0.15.2/arm-zephyr-eabi/arm-zephyr-eabi -imacros /__w/zephyr/zephyr/include/zephyr/toolchain/zephyr_stdint.h -Wall -Wformat -Wformat-security -Wno-format-zero-length -Wno-main -Wno-pointer-sign -Wpointer-arith -Wexpansion-to-defined -Wno-unused-but-set-variable -Werror=implicit-int -fno-pic -fno-pie -Werror -fno-asynchronous-unwind-tables -fno-reorder-functions --param=min-pagesize=0 -fno-defer-pop -fmacro-prefix-map=/__w/zephyr/zephyr/samples/subsys/display/lvgl=CMAKE_SOURCE_DIR -fmacro-prefix-map=/__w/zephyr/zephyr=ZEPHYR_BASE -fmacro-prefix-map=/__w/zephyr=WEST_TOPDIR -ffunction-sections -fdata-sections -std=c99 -nostdinc -MD -MT zephyr/drivers/display/CMakeFiles/drivers__display.dir/display_ili9xxx.c.obj -MF zephyr/drivers/display/CMakeFiles/drivers__display.dir/display_ili9xxx.c.obj.d -o zephyr/drivers/display/CMakeFiles/drivers__display.dir/display_ili9xxx.c.obj -c /__w/zephyr/zephyr/drivers/display/display_ili9xxx.c
In file included from ../../../../../../../include/zephyr/toolchain.h:50,
                 from ../../../../../../../include/zephyr/sys/errno_private.h:10,
                 from /__w/zephyr/zephyr/lib/libc/minimal/include/errno.h:32,
                 from ../../../../../../../include/zephyr/drivers/gpio.h:18,
                 from /__w/zephyr/zephyr/drivers/display/display_ili9xxx.h:12,
                 from /__w/zephyr/zephyr/drivers/display/display_ili9xxx.c:9:
/__w/zephyr/zephyr/drivers/display/display_ili9341.h:91:9: error: static assertion failed: "ili9341: Error length display function control (DISCTRL) register"
   91 |         BUILD_ASSERT(DT_PROP_LEN(DT_INST(n, ilitek_ili9341), disctrl) == ILI9341_DISCTRL_LEN,      \
      |         ^~~~~~~~~~~~
/__w/zephyr/zephyr/drivers/display/display_ili9xxx.c:426:9: note: in expansion of macro 'ILI9341_REGS_INIT'
  426 |         ILI##t##_REGS_INIT(n);                                                 \
      |         ^~~
../../../../../../../include/zephyr/sys/util_loops.h:1086:9: note: in expansion of macro 'ILI9XXX_INIT'
 1086 |         F(0, __VA_ARGS__)
      |         ^
../../../../../../../include/zephyr/sys/util_internal.h:105:36: note: in expansion of macro 'Z_UTIL_LISTIFY_1'
  105 | #define UTIL_PRIMITIVE_CAT(a, ...) a##__VA_ARGS__
      |                                    ^
/__w/zephyr/zephyr/drivers/display/display_ili9xxx.c:453:9: note: in expansion of macro 'LISTIFY'
  453 |         LISTIFY(DT_NUM_INST_STATUS_OKAY(ilitek_ili##t), ILI9XXX_INIT, (;), t)
      |         ^~~~~~~
/__w/zephyr/zephyr/drivers/display/display_ili9xxx.c:462:1: note: in expansion of macro 'DT_INST_FOREACH_ILI9XXX_STATUS_OKAY'
  462 | DT_INST_FOREACH_ILI9XXX_STATUS_OKAY(9341);
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Environment (please complete the following information):

• OS: Ubuntu 20.04
• Toolchain: Zephyr SDK 0.15.2
• Commit SHA: 432ff20

[erwango]

Issue is the following:
ili9341 device prop disctrl len (initially set to [0a 82 27]; by @papadkostas who recently updated stm32f429_disc1 display support) is no more in line with new property definition which now expects 4 params (@JvanDooren distrcl property definition).

I had 2 tries:

• Add 4th param with the default value proposed by @JvanDooren ([0a 82 27 04])
• Revert drivers: display: ili9341: add 4th parameter in DISCTRL command #54152 to use initial configuration.

In both cases, build issue is fixed, but configuration seems wrong, as I get the following:

I'm not a display expert, so not sure how to proceed. If @papadkostas can't help right now, what we can do is to fix current build issue with the 4th param addition and then open a new issue about screen configuration.

(Note that this shouldn't be a hw revision issue, as there was no change on display on this board history).

[fabiobaltieri]

@erwango the board configuration is a bit odd right now, the ili9341 configuration has been changed for RGB input since the LTDC driver has been introduced, but the board still uses ili9341 by default, and changling it to ltdc does not work because while the ltdc driver controls the output, the ili9341 one controls the blanking. This is what works for me:

diff --git a/boards/arm/stm32f429i_disc1/stm32f429i_disc1.dts b/boards/arm/stm32f429i_disc1/stm32f429i_disc1.dts
index 3836e13c0d..d4dc810c27 100644
--- a/boards/arm/stm32f429i_disc1/stm32f429i_disc1.dts
+++ b/boards/arm/stm32f429i_disc1/stm32f429i_disc1.dts
@@ -20,7 +20,7 @@
                zephyr,sram = &sram0;
                zephyr,flash = &flash0;
                zephyr,ccm = &ccm0;
-               zephyr,display = &ili9341;
+               zephyr,display = &ltdc;
        };
 
        sdram2: sdram@d0000000 {
@@ -137,7 +137,7 @@
                timctrlb = [00 00];
                pwseqctrl = [64 03 12 81];
                pumpratioctrl = [20];
-               disctrl = [08 82 27];
+               disctrl = [08 82 27 04];
                vmctrl1 = [45 15];
                vmctrl2 = [90];
                enable3g = [00];
diff --git a/samples/subsys/display/lvgl/src/main.c b/samples/subsys/display/lvgl/src/main.c
index 900961ff8e..88e5f806c6 100644
--- a/samples/subsys/display/lvgl/src/main.c
+++ b/samples/subsys/display/lvgl/src/main.c
@@ -94,6 +94,7 @@ void main(void)
 
        lv_task_handler();
        display_blanking_off(display_dev);
+       display_blanking_off(DEVICE_DT_GET(DT_NODELABEL(ili9341)));
 
        while (1) {
                if ((count % 100) == 0U) {

Not sure what the clean fix would be, maybe having a "blanking_dev" in the sample and an extra pointer in the dts?

[papadkostas]

I'll have a look, still got the board.

[papadkostas]

54709 Fixes compilation but display is like @erwango posted.
The issue is exacly as @fabiobaltieri posted. I was thinking maybe we could do this

diff --git a/drivers/display/display_ili9xxx.c b/drivers/display/display_ili9xxx.c
index abfaa27ffa..c0d8339b01 100644
--- a/drivers/display/display_ili9xxx.c
+++ b/drivers/display/display_ili9xxx.c
@@ -390,7 +390,7 @@ static int ili9xxx_init(const struct device *dev)
 
        k_sleep(K_MSEC(ILI9XXX_RESET_WAIT_TIME));
 
-       ili9xxx_display_blanking_on(dev);
+       ili9xxx_display_blanking_off(dev);
 
        r = ili9xxx_configure(dev);
        if (r < 0) {