Hi Vladimir,
Am 2020-03-10 13:55, schrieb Vladimir Oltean:
From: Vladimir Oltean <vladimir.oltean@xxxxxxx>
This series addresses a few issues that were missed during the previous
series "[PATCH 00/12] TCFQ to XSPI migration for NXP DSPI driver", on
SoCs other than LS1021A and LS1043A. DMA mode has been completely
broken
by that series, and XSPI mode never worked on little-endian
controllers.
Then it introduces support for the LS1028A chip, whose compatible has
recently been documented here:
https://lore.kernel.org/linux-devicetree/20200218171418.18297-1-michael@xxxxxxxx/
The device tree for the LS1028A SoC is extended with DMA channels
definition, such that even though the default operating mode is XSPI,
one can simply change DSPI_XSPI_MODE to DSPI_DMA_MODE in the
devtype_data structure of the driver and use that instead.
I don't expect the "fixes" patches to reach very far down the stable
pipe, since there has been pretty heavy refactoring in this driver.
For testing, benchmarking and debugging, the mikroBUS connector on the
LS1028A-RDB is made available via spidev.
XSPI mode, while now I cannot reproduce the kernel oops anymore, I've
found two
other problems (1), (2). Which are likely the same underlying problem.
DMA mode
works "better" now, still one problem (3).
(1) It seems like the first write/read/erase after the aborted
instruction
don't get through:
# hexdump -C /dev/mtd0
00000000 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
|................|
*
[ 627.914654] fsl-dspi 2120000.spi: Waiting for transfer to complete
failed!
^C[ 627.921649] spi_master spi1: failed to transfer one message from
queue
#
# echo huhu > /dev/mtd0
# hexdump -C /dev/mtd0
00000000 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
|................|
*
hexdump: /dev/mtd0: Input/output error
003df000
# echo huhu > /dev/mtd0
# hexdump -C /dev/mtd0
00000000 68 75 68 75 0a ff ff ff ff ff ff ff ff ff ff ff
|huhu............|
00000010 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
|................|
*
[ 642.738905] fsl-dspi 2120000.spi: Waiting for transfer to complete
failed!
^C[ 642.745832] spi_master spi1: failed to transfer one message from
queue
#
# flash_erase /dev/mtd0 0 1
Erasing 4 Kibyte @ 0 -- 100 % complete
#
# hexdump -C /dev/mtd0
00000000 68 75 68 75 0a ff ff ff ff ff ff ff ff ff ff ff
|huhu............|
00000010 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
|................|
*
hexdump: /dev/mtd0: Input/output error
0023d000
# hexdump -C /dev/mtd0
00000000 68 75 68 75 0a ff ff ff ff ff ff ff ff ff ff ff
|huhu............|
00000010 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
|................|
*
(2) Also, reading the flash, every second time there is (reproducibly)
an
IO error:
# hexdump -C /dev/mtd0
00000000 68 75 68 75 0a ff ff ff ff ff ff ff ff ff ff ff
|huhu............|
00000010 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
|................|
*
01000000
# hexdump -C /dev/mtd0
00000000 68 75 68 75 0a ff ff ff ff ff ff ff ff ff ff ff
|huhu............|
00000010 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
|................|
*
hexdump: /dev/mtd0: Input/output error
00dc0000
# hexdump -C /dev/mtd0
00000000 68 75 68 75 0a ff ff ff ff ff ff ff ff ff ff ff
|huhu............|
00000010 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
|................|
*
01000000
# hexdump -C /dev/mtd0
00000000 68 75 68 75 0a ff ff ff ff ff ff ff ff ff ff ff
|huhu............|
00000010 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
|................|
*
hexdump: /dev/mtd0: Input/output error
00e6a000
(3) Depening on the content length there is also an IO error. Funny
enough,
the content is still written to the SPI flash.
# echo -n 1 > /dev/mtd10
# echo -n 12 > /dev/mtd10
# echo -n 123 > /dev/mtd10
# echo -n 1234 > /dev/mtd10
# echo -n 12345 > /dev/mtd10
sh: write error: Input/output error
# echo -n 123456 > /dev/mtd10
# echo -n 1234567 > /dev/mtd10
sh: write error: Input/output error
# echo -n 12345678 > /dev/mtd10
# echo -n 123456789 > /dev/mtd10
# echo -n 1234567890 > /dev/mtd10
# echo -n 12345678901 > /dev/mtd10
# echo -n 123456789012 > /dev/mtd10
# echo -n 1234567890123 > /dev/mtd10
sh: write error: Input/output error
# echo -n 12345678901234 > /dev/mtd10
# echo -n 123456789012345 > /dev/mtd10
sh: write error: Input/output error
# echo -n 1234567890123456 > /dev/mtd10
# echo -n 12345678901234567 > /dev/mtd10
# echo -n 123456789012345678 > /dev/mtd10
# flash_erase /dev/mtd10 0 1
Erasing 4 Kibyte @ 0 -- 100 % complete
# hexdump -C /dev/mtd10
00000000 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
|................|
*
^C
# echo -n 12345 > /dev/mtd10
sh: write error: Input/output error
# hexdump -C /dev/mtd10
00000000 31 32 33 34 35 ff ff ff ff ff ff ff ff ff ff ff
|12345...........|
00000010 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
|................|
*
^C
-michael
Vladimir Oltean (7):
spi: spi-fsl-dspi: Don't access reserved fields in SPI_MCR
spi: spi-fsl-dspi: Avoid use-after-free in interrupt mode
spi: spi-fsl-dspi: Fix little endian access to PUSHR CMD and TXDATA
spi: spi-fsl-dspi: Fix bits-per-word acceleration in DMA mode
spi: spi-fsl-dspi: Add support for LS1028A
arm64: dts: ls1028a: Specify the DMA channels for the DSPI
controllers
arm64: dts: ls1028a-rdb: Add a spidev node for the mikroBUS
.../boot/dts/freescale/fsl-ls1028a-rdb.dts | 14 ++
.../arm64/boot/dts/freescale/fsl-ls1028a.dtsi | 6 +
drivers/spi/spi-fsl-dspi.c | 188 +++++++++++-------
3 files changed, 134 insertions(+), 74 deletions(-)
