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nuttx/drivers
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DuoYuWang e84259cbcc drivers/mmcsd: fix eMMC bus width switch sequencing 
Two sequencing problems in the MMC wide bus path break eMMC 4-bit
operation on hosts that program the bus width in the SDIO widebus /
clock callbacks (e.g. STM32H7):

1. The SWITCH command (CMD6) is issued before the host has switched
   to wide bus operation.  When the card completes the switch while
   the host is still in 1-bit mode the switch never takes effect and
   every following data transfer times out.  Switch the host to wide
   bus operation before issuing CMD6.

2. The transfer clock is selected only at the end of mmcsd_widebus(),
   so the whole switch sequence runs at ID-mode clock and, on the
   affected hosts, the final clock update does not take effect either,
   leaving the bus at ~400 kHz.  Select the MMC transfer clock before
   calling mmcsd_widebus(), and pick CLOCK_MMC_TRANSFER_4BIT when wide
   bus operation is active (mirroring the SD card path) so a later
   clock selection cannot revert the host to 1-bit.

No behavior change for SD cards, and no change on hosts whose widebus
callback only records the requested state.

Tested on a custom STM32H743 board with eMMC: sd_bench sequential
write ~4.1 MB/s, sequential read ~6.3 MB/s (previously all data
transfers timed out).

Signed-off-by: DuoYuWang <thirteenking.wang@gmail.com>
2026-07-23 15:26:05 +08:00
..
1wire drivers/efuse/efuse: Drivers Registered With World Write Permissions(Part 1) 2026-07-13 12:08:01 +02:00
aie drivers/efuse/efuse: Drivers Registered With World Write Permissions(Part 1) 2026-07-13 12:08:01 +02:00
analog drivers/efuse/efuse: Drivers Registered With World Write Permissions(Part 1) 2026-07-13 12:08:01 +02:00
audio drivers/efuse/efuse: Drivers Registered With World Write Permissions(Part 1) 2026-07-13 12:08:01 +02:00
bch drivers/efuse/efuse: Drivers Registered With World Write Permissions(Part 1) 2026-07-13 12:08:01 +02:00
can drivers/efuse/efuse: Drivers Registered With World Write Permissions(Part 1) 2026-07-13 12:08:01 +02:00
clk !include/fcntl.h: align open flags with Linux values 2026-06-30 13:43:44 +08:00
contactless drivers/contactless: fix uninitialized uid leak in mfrc522_read 2026-07-13 19:50:57 +08:00
coresight drivers/: Multiple Drivers Are Registered With World Writable - Part 2 2026-07-15 15:27:28 +08:00
crypto drivers/efuse/efuse: Drivers Registered With World Write Permissions(Part 1) 2026-07-13 12:08:01 +02:00
devicetree include/debug.h: Move to include/nuttx/debug.h 2026-04-07 07:50:06 -03:00
dma drivers: migrate to SPDX identifier 2024-11-06 18:02:25 +08:00
dummy drivers: migrate to SPDX identifier 2024-11-06 18:02:25 +08:00
eeprom drivers/efuse/efuse: Drivers Registered With World Write Permissions(Part 1) 2026-07-13 12:08:01 +02:00
efuse drivers/efuse/efuse: Drivers Registered With World Write Permissions(Part 1) 2026-07-13 12:08:01 +02:00
i2c drivers/efuse/efuse: Drivers Registered With World Write Permissions(Part 1) 2026-07-13 12:08:01 +02:00
i2s drivers/efuse/efuse: Drivers Registered With World Write Permissions(Part 1) 2026-07-13 12:08:01 +02:00
i3c drivers/: Multiple Drivers Are Registered With World Writable - Part 2 2026-07-15 15:27:28 +08:00
input drivers/: Multiple Drivers Are Registered With World Writable - Part 2 2026-07-15 15:27:28 +08:00
ioexpander drivers/: Multiple Drivers Are Registered With World Writable - Part 2 2026-07-15 15:27:28 +08:00
ipcc drivers/: Multiple Drivers Are Registered With World Writable - Part 2 2026-07-15 15:27:28 +08:00
lcd drivers/: Multiple Drivers Are Registered With World Writable - Part 2 2026-07-15 15:27:28 +08:00
leds drivers/: Multiple Drivers Are Registered With World Writable - Part 2 2026-07-15 15:27:28 +08:00
loop drivers/: Multiple Drivers Are Registered With World Writable - Part 2 2026-07-15 15:27:28 +08:00
math drivers/: Multiple Drivers Are Registered With World Writable - Part 2 2026-07-15 15:27:28 +08:00
misc libs/libc: Fix divide-by-zero in stat() with large filesystem block sizes 2026-07-16 23:37:22 +08:00
mmcsd drivers/mmcsd: fix eMMC bus width switch sequencing 2026-07-23 15:26:05 +08:00
modem drivers/: Multiple Drivers Are Registered With World Writable - Part 2 2026-07-15 15:27:28 +08:00
motor drivers/: Multiple Drivers Are Registered With World Writable - Part 2 2026-07-15 15:27:28 +08:00
mtd libs/libc: Fix divide-by-zero in stat() with large filesystem block sizes 2026-07-16 23:37:22 +08:00
net drivers/: Multiple Drivers Are Registered With World Writable - Part 2 2026-07-15 15:27:28 +08:00
note drivers/: Multiple Drivers Are Registered With World Writable - Part 2 2026-07-15 15:27:28 +08:00
pci drivers/: Multiple Drivers Are Registered With World Writable - Part 2 2026-07-15 15:27:28 +08:00
pinctrl drivers/: Multiple Drivers Are Registered With World Writable - Part 2 2026-07-15 15:27:28 +08:00
pipes drivers/: Multiple Drivers Are Registered With World Writable Part 3 2026-07-16 09:49:07 -03:00
power drivers/: Multiple Drivers Are Registered With World Writable - Part 2 2026-07-15 15:27:28 +08:00
rc drivers/: Multiple Drivers Are Registered With World Writable - Part 2 2026-07-15 15:27:28 +08:00
regmap include/debug.h: Move to include/nuttx/debug.h 2026-04-07 07:50:06 -03:00
reset include/debug.h: Move to include/nuttx/debug.h 2026-04-07 07:50:06 -03:00
rf drivers/: Multiple Drivers Are Registered With World Writable - Part 2 2026-07-15 15:27:28 +08:00
rpmsg drivers/: Multiple Drivers Are Registered With World Writable - Part 2 2026-07-15 15:27:28 +08:00
rptun drivers/: Multiple Drivers Are Registered With World Writable - Part 2 2026-07-15 15:27:28 +08:00
segger drivers/segger: Download systemview from NuttX Mirror Repo 2026-06-03 19:19:24 +08:00
sensors drivers/: Multiple Drivers Are Registered With World Writable Part 3 2026-07-16 09:49:07 -03:00
serial drivers/serial: Modify serial/pty to allow NSH/Telnet line edit 2026-07-22 22:07:18 +08:00
spi drivers/spi/ice40: fix operator precedence in final clock cycle count 2026-07-20 17:05:01 +08:00
syslog drivers/: Multiple Drivers Are Registered With World Writable - Part 2 2026-07-15 15:27:28 +08:00
thermal include/debug.h: Move to include/nuttx/debug.h 2026-04-07 07:50:06 -03:00
timers drivers/watchdog: fix capture automonitor notifier context 2026-07-17 14:59:47 +08:00
usbdev drivers/: Multiple Drivers Are Registered With World Writable Part 3 2026-07-16 09:49:07 -03:00
usbhost libs/libc: Fix divide-by-zero in stat() with large filesystem block sizes 2026-07-16 23:37:22 +08:00
usbmisc drivers/: Multiple Drivers Are Registered With World Writable - Part 2 2026-07-15 15:27:28 +08:00
usbmonitor include/debug.h: Move to include/nuttx/debug.h 2026-04-07 07:50:06 -03:00
usrsock drivers/: Multiple Drivers Are Registered With World Writable - Part 2 2026-07-15 15:27:28 +08:00
vhost include/debug.h: Move to include/nuttx/debug.h 2026-04-07 07:50:06 -03:00
video drivers/: Multiple Drivers Are Registered With World Writable Part 3 2026-07-16 09:49:07 -03:00
virtio drivers/: Multiple Drivers Are Registered With World Writable Part 3 2026-07-16 09:49:07 -03:00
wireless drivers/: Multiple Drivers Are Registered With World Writable - Part 2 2026-07-15 15:27:28 +08:00
.gitignore build: Remve the unnecessary .gitignore 2020-05-23 18:00:40 +01:00
CMakeLists.txt drivers: migrate to SPDX identifier 2024-11-06 18:02:25 +08:00
drivers_initialize.c serial/uart_rpmsg: add _raw version of driver 2026-02-23 09:19:57 -03:00
Kconfig espressif/rmt: replace rmtchar with arch-specific lirc adapter 2026-04-04 11:18:32 -03:00
Makefile docs/rc: document RC/LIRC drivers and remove empty drivers/rmt files 2026-04-04 11:18:32 -03:00