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u-boot/drivers/serial
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Stephan Gerhold ad7e967738 serial: serial_msm: Delay initialization to let pins stabilize 
For some reason, the DragonBoard 410c aborts autoboot immediately if
U-Boot is started without LK. It looks like it picks up a single broken
character via serial and therefore believes a key was pressed to abort
autoboot.

After some debugging, it seems like adding some delay after pinctrl
setup but before UART initialization fixes the issue. It's also worth
mentioning that unlike when booting from LK, the pinctrl setup is
actually necessary when booting U-Boot without LK since UART is broken
if the pinctrl line is removed.

I suspect that reconfiguring the pins might take some time to stabilize
and if the UART controller is enabled too quickly it will pick up some
random noise. Adding a few milliseconds of delay fixes the issue and
shouldn't have any other negative side effects.

3ms seems to be the minimum delay required in my tests, use 5ms instead
just to be sure.

Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
2021-07-23 18:53:46 -04:00
..
altera_jtag_uart.c dm: Use access methods for dev/uclass private data 2021-01-05 12:24:40 -07:00
altera_uart.c dm: Use access methods for dev/uclass private data 2021-01-05 12:24:40 -07:00
arm_dcc.c serial: Remove DM_FLAG_PRE_RELOC flag in various drivers 2018-11-14 09:16:28 -08:00
atmel_usart.c common: Drop asm/global_data.h from common header 2021-02-02 15:33:42 -05:00
atmel_usart.h SPDX: Convert all of our single license tags to Linux Kernel style 2018-05-07 09:34:12 -04:00
Kconfig arm: mvebu: armada-3720: remove unused config option 2021-07-15 10:53:05 +02:00
lpc32xx_hsuart.c dm: treewide: Rename ..._platdata variables to just ..._plat 2020-12-13 16:51:09 -07:00
Makefile arm: Remove edb9315a board 2021-07-07 22:22:42 -04:00
ns16550.c serial: ns16550: Handle zero <clock-frequency> value 2021-03-03 19:17:25 -07:00
sandbox.c common: Drop asm/global_data.h from common header 2021-02-02 15:33:42 -05:00
serial-uclass.c dm: define LOG_CATEGORY for all uclass 2021-07-06 10:38:03 -06:00
serial.c common: Drop asm/global_data.h from common header 2021-02-02 15:33:42 -05:00
serial_ar933x.c dm: treewide: Rename auto_alloc_size members to be shorter 2020-12-13 08:00:25 -07:00
serial_arc.c common: Drop asm/global_data.h from common header 2021-02-02 15:33:42 -05:00
serial_bcm283x_mu.c dm: treewide: Rename ..._platdata variables to just ..._plat 2020-12-13 16:51:09 -07:00
serial_bcm283x_pl011.c dm: treewide: Rename ..._platdata variables to just ..._plat 2020-12-13 16:51:09 -07:00
serial_bcm6345.c dm: treewide: Rename auto_alloc_size members to be shorter 2020-12-13 08:00:25 -07:00
serial_coreboot.c x86: Make coreboot sysinfo available to any x86 board 2021-03-27 13:59:37 +13:00
serial_cortina.c dm: treewide: Rename ofdata_to_platdata() to of_to_plat() 2020-12-13 16:51:09 -07:00
serial_efi.c dm: treewide: Rename auto_alloc_size members to be shorter 2020-12-13 08:00:25 -07:00
serial_intel_mid.c serial: Update NS16550_t and struct NS16550 2021-01-05 12:24:40 -07:00
serial_linflexuart.c common: Drop asm/global_data.h from common header 2021-02-02 15:33:42 -05:00
serial_lpuart.c common: Drop asm/global_data.h from common header 2021-02-02 15:33:42 -05:00
serial_mcf.c common: Drop asm/global_data.h from common header 2021-02-02 15:33:42 -05:00
serial_meson.c dm: Use access methods for dev/uclass private data 2021-01-05 12:24:40 -07:00
serial_mpc8xx.c common: Drop asm/global_data.h from common header 2021-02-02 15:33:42 -05:00
serial_msm.c serial: serial_msm: Delay initialization to let pins stabilize 2021-07-23 18:53:46 -04:00
serial_mt7620.c serial: add uart driver for MediaTek MT7620 SoC 2021-01-24 21:39:26 +01:00
serial_mtk.c serial: mtk: rewrite the setbrg function 2021-03-20 16:24:27 -04:00
serial_mvebu_a3700.c serial: a37xx: Switch to XTAL clock when booting Linux kernel 2021-07-08 16:40:52 +02:00
serial_mxc.c common: Drop asm/global_data.h from common header 2021-02-02 15:33:42 -05:00
serial_ns16550.c common: Drop asm/global_data.h from common header 2021-02-02 15:33:42 -05:00
serial_nulldev.c SPDX: Convert all of our single license tags to Linux Kernel style 2018-05-07 09:34:12 -04:00
serial_octeon_bootcmd.c serial: serial_octeon_bootcmd.c: Add PCI remote console support 2021-04-23 21:22:55 +02:00
serial_octeon_pcie_console.c serial: serial_octeon_pcie_console.c: Add PCI remote console support 2021-04-23 21:22:55 +02:00
serial_omap.c dm: Use access methods for dev/uclass private data 2021-01-05 12:24:40 -07:00
serial_owl.c dm: treewide: Rename ofdata_to_platdata() to of_to_plat() 2020-12-13 16:51:09 -07:00
serial_pic32.c common: Drop asm/global_data.h from common header 2021-02-02 15:33:42 -05:00
serial_pl01x.c arm: Remove edb9315a board 2021-07-07 22:22:42 -04:00
serial_pl01x_internal.h dm: treewide: Rename ofdata_to_platdata() to of_to_plat() 2020-12-13 16:51:09 -07:00
serial_pxa.c common: Drop asm/global_data.h from common header 2021-02-02 15:33:42 -05:00
serial_rockchip.c dm: Use access methods for dev/uclass private data 2021-01-05 12:24:40 -07:00
serial_s5p.c common: Drop asm/global_data.h from common header 2021-02-02 15:33:42 -05:00
serial_sh.c common: Drop asm/global_data.h from common header 2021-02-02 15:33:42 -05:00
serial_sh.h sh: sh3: Remove CPU support 2019-05-10 22:43:18 +02:00
serial_sifive.c Merge branch '2021-02-02-drop-asm_global_data-when-unused' 2021-02-15 10:16:45 -05:00
serial_sti_asc.c common: Drop asm/global_data.h from common header 2021-02-02 15:33:42 -05:00
serial_stm32.c serial: stm32: define LOG_CATEGORY 2021-01-13 09:52:58 +01:00
serial_stm32.h dm: treewide: Rename ..._platdata variables to just ..._plat 2020-12-13 16:51:09 -07:00
serial_uniphier.c dm: treewide: Rename auto_alloc_size members to be shorter 2020-12-13 08:00:25 -07:00
serial_xen.c common: Drop asm/global_data.h from common header 2021-02-02 15:33:42 -05:00
serial_xuartlite.c Xilinx changes for v2021.04 2021-01-06 07:57:33 -05:00
serial_zynq.c serial: zynq: Add support for serial parameters 2021-06-28 08:56:03 +02:00
usbtty.c serial: usbtty: Send urb data in correct order 2021-03-03 04:12:45 +01:00
usbtty.h SPDX: Convert all of our single license tags to Linux Kernel style 2018-05-07 09:34:12 -04:00