[PATCH 0/4] Fix the i2c/clk bug of stm32 mcu platform

[Dillon Min]

Hi Patrice, Alain,

Could you help to take a look at this patchset, thanks.

This series is the rebase to the newest kernel commit:
88b06399c9c766c283e070b022b5ceafa4f63f19

according to the request from:
https://lore.kernel.org/lkml/ff2bc09d-1a17-50d4-d3ee-16fd3a86d7f1@foss.st.com/

The clk bug affects the kernel bootup on stm32f469-disco board
in case display config(CONFIG_DRM_STM, CONFIG_DRM_STM_DSI,
DRM_PANEL_ORISETECH_OTM8009A)
enabled.

If you want to test clk patch on stm32f429-disco board, the
panel-ilitek-ili9341.c can be
used for that purpose (CONFIG_DRM_STM, DRM_PANEL_ILITEK_ILI9341)

i2c driver patch intent to fix the touch panel driver get data through
i2c bus timeout issue.

Best regards.
Dillon

On Fri, May 14, 2021 at 7:02 PM <dillon.minfei at gmail.com> wrote:
>
> From: Dillon Min <dillon.minfei at gmail.com>
>
> This seriese fix three i2c/clk bug for stm32 f4/f7
> - kernel runing in sdram, i2c driver get data timeout
> - ltdc clk turn off after kernel console active
> - kernel hang in set ltdc clock rate
>
> clk bug found on stm32f429/f469-disco board
>
> Hi Patrice:
> below is the guide to verify the patch:
>
> setup test env with following files(link at below 'files link'):
> [1] u-boot-dtb.bin
> [2] rootfs zip file (used in kernel initramfs)
> [3] u-boot's mkimage to create itb file
> [4] kernel config file
> [5] my itb with-or-without i2c patch
>
> This patch based on kernel commit:
> 88b06399c9c766c283e070b022b5ceafa4f63f19
>
> Note:
> panel-ilitek-ili9341.c is the driver which was submitted last year, but not
> get accepted. it's used to setup touch screen calibration, then test i2c.
>
> create itb file(please correct path of 'data'):
> ./mkimage -f stm32.its stm32.itb
>
> HW setup:
> console:
>        PA9, PA10
>        usart0
>        serial at 40011000
>        115200 8n1
>
> -- flash u-boot.bin to stm32f429-disco on PC
> $ sudo openocd -f board/stm32f429discovery.cfg -c \
>   '{PATH-TO-YOUR-UBOOT}/u-boot-dtb.bin 0x08000000 exit reset'
>
> -- setup kernel load bootargs at u-boot
> U-Boot > setenv bootargs 'console=tty0 console=ttySTM0,115200
>                     root=/dev/ram rdinit=/linuxrc loglevel=8 fbcon=rotate:2'
> U-Boot > loady;bootm
> (download stm32.dtb or your kernel with itb format, or download zImage, dtb)
>
> -- setup ts_calibrate running env on stm32f429-disco
> / # export TSLIB_CONFFILE=/etc/ts.conf
> / # export TSLIB_TSDEVICE=/dev/input/event0
> / # export TSLIB_CONSOLEDEVICE=none
> / # export TSLIB_FBDEVICE=/dev/fb0
>
> -- clear screen
> / # ./fb
>
> -- run ts_calibrate
> / # ts_calibrate
> (you can calibrate touchscreen now, and get below errors)
>
> [  113.942087] stmpe-i2c0-0041: failed to read regs 0x52: -110
> [  114.063598] stmpe-i2c 0-0041: failed to read reg 0x4b: -16
> [  114.185629] stmpe-i2c 0-0041: failed to read reg 0x40: -16
> [  114.307257] stmpe-i2c 0-0041: failed to write reg 0xb: -16
>
> ...
> with i2c patch applied, you will find below logs:
>
> RAW---------------------> 3164 908 183 118.110884
> TS_READ_RAW----> x = 3164, y =908, pressure = 183
> RAW---------------------> 3166 922 126 118.138946
> TS_READ_RAW----> x = 3166, y = 922, pressure = 126
> ....
>
> files link:
> https://drive.google.com/drive/folders/1qNbjChcB6UGtKzne2F5x9_WG_sZFyo3o?usp=sharing
>
>
>
>
> Dillon Min (4):
>   drm/panel: Add ilitek ili9341 panel driver
>   i2c: stm32f4: Fix stmpe811 get xyz data timeout issue
>   clk: stm32: Fix stm32f429's ltdc driver hang in set clock rate
>   clk: stm32: Fix ltdc's clock turn off by clk_disable_unused() after
>     kernel startup
>
>  drivers/clk/clk-stm32f4.c                    |   10 +-
>  drivers/gpu/drm/panel/Kconfig                |   12 +
>  drivers/gpu/drm/panel/Makefile               |    1 +
>  drivers/gpu/drm/panel/panel-ilitek-ili9341.c | 1285 ++++++++++++++++++++++++++
>  drivers/i2c/busses/i2c-stm32f4.c             |   12 +-
>  5 files changed, 1310 insertions(+), 10 deletions(-)
>  create mode 100755 drivers/gpu/drm/panel/panel-ilitek-ili9341.c
>
> --
> 2.7.4
>