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We need the tty/serial fixes in here as well.
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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If there is a problem after resetting a port, the do/while() loop that
checks the default value of DIVLSB register may run forever and spam the
I2C bus.
Add a delay before each read of DIVLSB, and a maximum number of tries to
prevent that situation from happening.
Also fail probe if port reset is unsuccessful.
Fixes: 10d8b34a4217 ("serial: max310x: Driver rework")
Cc: [email protected]
Signed-off-by: Hugo Villeneuve <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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A stable clock is really required in order to use this UART, so log an
error message and bail out if the chip reports that the clock is not
stable.
Fixes: 4cf9a888fd3c ("serial: max310x: Check the clock readiness")
Cc: [email protected]
Suggested-by: Jan Kundrát <[email protected]>
Link: https://www.spinics.net/lists/linux-serial/msg35773.html
Signed-off-by: Hugo Villeneuve <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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Some people are seeing a warning similar to this when using a crystal:
max310x 11-006c: clock is not stable yet
The datasheet doesn't mention the maximum time to wait for the clock to be
stable when using a crystal, and it seems that the 10ms delay in the driver
is not always sufficient.
Jan Kundrát reported that it took three tries (each separated by 10ms) to
get a stable clock.
Modify behavior to check stable clock ready bit multiple times (20), and
waiting 10ms between each try.
Note: the first draft of the driver originally used a 50ms delay, without
checking the clock stable bit.
Then a loop with 1000 retries was implemented, each time reading the clock
stable bit.
Fixes: 4cf9a888fd3c ("serial: max310x: Check the clock readiness")
Cc: [email protected]
Suggested-by: Jan Kundrát <[email protected]>
Link: https://www.spinics.net/lists/linux-serial/msg35773.html
Link: https://lore.kernel.org/all/[email protected]/raw
Link: https://github.com/boundarydevices/linux/commit/e5dfe3e4a751392515d78051973190301a37ca9a
Signed-off-by: Hugo Villeneuve <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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If regmap_read() returns a non-zero value, the 'val' variable can be left
uninitialized.
Clear it before calling regmap_read() to make sure we properly detect
the clock ready bit.
Fixes: 4cf9a888fd3c ("serial: max310x: Check the clock readiness")
Cc: [email protected]
Signed-off-by: Hugo Villeneuve <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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In uart_tiocmget():
result = uport->mctrl;
uart_port_lock_irq(uport);
result |= uport->ops->get_mctrl(uport);
uart_port_unlock_irq(uport);
...
return result;
In uart_update_mctrl():
uart_port_lock_irqsave(port, &flags);
...
port->mctrl = (old & ~clear) | set;
...
port->ops->set_mctrl(port, port->mctrl);
...
uart_port_unlock_irqrestore(port, flags);
An atomicity violation is identified due to the concurrent execution of
uart_tiocmget() and uart_update_mctrl(). After assigning
result = uport->mctrl, the mctrl value may change in uart_update_mctrl(),
leading to a mismatch between the value returned by
uport->ops->get_mctrl(uport) and the mctrl value previously read.
This can result in uart_tiocmget() returning an incorrect value.
This possible bug is found by an experimental static analysis tool
developed by our team, BassCheck[1]. This tool analyzes the locking APIs
to extract function pairs that can be concurrently executed, and then
analyzes the instructions in the paired functions to identify possible
concurrency bugs including data races and atomicity violations. The above
possible bug is reported when our tool analyzes the source code of
Linux 5.17.
To address this issue, it is suggested to move the line
result = uport->mctrl inside the uart_port_lock block to ensure atomicity
and prevent the mctrl value from being altered during the execution of
uart_tiocmget(). With this patch applied, our tool no longer reports the
bug, with the kernel configuration allyesconfig for x86_64. Due to the
absence of the requisite hardware, we are unable to conduct runtime
testing of the patch. Therefore, our verification is solely based on code
logic analysis.
[1] https://sites.google.com/view/basscheck/
Fixes: c5f4644e6c8b ("[PATCH] Serial: Adjust serial locking")
Cc: [email protected]
Signed-off-by: Gui-Dong Han <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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These > comparisons should be >= to prevent writing one element beyond
the end of the rx_buff[] array. The rx_buff[] buffer has RX_BUF_SIZE
elements. Fix the buffer overflow.
Fixes: aba8290f368d ("8250: microchip: pci1xxxx: Add Burst mode reception support in uart driver for writing into FIFO")
Signed-off-by: Dan Carpenter <[email protected]>
Link: https://lore.kernel.org/r/ZZ7vIfj7Jgh-pJn8@moroto
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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Add rs485 support to uartps driver. Use either rts-gpios or RTS
to control RS485 phy as driver or a receiver.
Signed-off-by: Manikanta Guntupalli <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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Relocate cdns_uart_tx_empty function to avoid prototype statement in
rs485 changes.
Update return check with uart_tx_stopped() in cdns_uart_handle_tx().
Signed-off-by: Manikanta Guntupalli <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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The current clock input is set to 62.5 MHz for supporting fractional
divider, which enables generation of an acceptable baud rate from any
frequency. With the current clock input the baud rate range is limited
to 3.9 Mbps. Hence, the current range is extended to support 4 Mbps
with Burst mode operation. Divisor calculation for a given baud rate is
updated as the sampling rate is reduced from 16 to 8 for 4 Mbps.
Signed-off-by: Rengarajan S <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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driver for reading from FIFO
pci1xxxx_handle_irq reads the burst status and checks if the FIFO
is empty and is ready to accept the incoming data. The handling is
done in pci1xxxx_tx_burst where each transaction processes data in
block of DWORDs, while any remaining bytes are processed individually,
one byte at a time.
Signed-off-by: Rengarajan S <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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drivers/tty/serial/serial_txx9.c:933:12: error: no previous prototype for ‘early_serial_txx9_setup’ [-Werror=missing-prototypes]
933 | int __init early_serial_txx9_setup(struct uart_port *port)
| ^~~~~~~~~~~~~~~~~~~~~~~
This function is called from arch/mips/txx9/generic/setup.c, and does
have a forward declaration in arch/mips/include/asm/txx9/generic.h.
As the TXX9 serial driver does not support compile-testing, and thus can
only be built on MIPS, fix this by including the MIPS-only header file.
Signed-off-by: Geert Uytterhoeven <[email protected]>
Link: https://lore.kernel.org/r/818be2380061c19fe65819f7b7f10ab6e7aaa082.1706040343.git.geert+renesas@glider.be
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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This SoC family was destined for server use, featuring Qualcomm's very
interesting Kryo cores (before "Kryo" became a marketing term for Arm
cores with small modifications). It did however not leave the labs of
Qualcomm and presumably some partners, nor was it ever productized.
Remove the workarounds, as they are long obsolete.
Signed-off-by: Konrad Dybcio <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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Use u32 for the members of ``struct s3c24xx_uart_info`` that are used
for register interactions. The purpose of these members becomes clearer.
The greater benefit of this change is that it also reduces the memory
footprint of the struct, allowing 64-bit architectures to use a
single cacheline for the entire struct.
struct s3c24xx_uart_info {
const char * name; /* 0 8 */
enum s3c24xx_port_type type; /* 8 4 */
unsigned int port_type; /* 12 4 */
unsigned int fifosize; /* 16 4 */
u32 rx_fifomask; /* 20 4 */
u32 rx_fifoshift; /* 24 4 */
u32 rx_fifofull; /* 28 4 */
u32 tx_fifomask; /* 32 4 */
u32 tx_fifoshift; /* 36 4 */
u32 tx_fifofull; /* 40 4 */
u32 clksel_mask; /* 44 4 */
u32 clksel_shift; /* 48 4 */
u32 ucon_mask; /* 52 4 */
u8 def_clk_sel; /* 56 1 */
u8 num_clks; /* 57 1 */
u8 iotype; /* 58 1 */
bool has_divslot; /* 59 1 */
/* size: 64, cachelines: 1, members: 17 */
/* padding: 4 */
};
Reviewed-by: Sam Protsenko <[email protected]>
Signed-off-by: Tudor Ambarus <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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Since the driver was introduced the port features flags never extended.
As we don't expect more flags soon that would bypass the first
cacheline of ``struct s3c24xx_uart_info``, change the type of
``has_divslot`` to bool. Bitfields operations incur performance penalty
when set or read as compared to direct types.
Signed-off-by: Tudor Ambarus <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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<linux/serial_s3c.h> provides a clock selection pool of maximum 4 clocks.
Update the driver to consider a pool selection of maximum 8 clocks.
u8 is large enough to allow more clocks than are supported by the driver
now, and not too big to cause spanning of ``struct s3c24xx_uart_info``
through 2 cachelines when compiled for arm64. The goal is to reduce the
memory footprint of ``struct s3c24xx_uart_info``.
Reviewed-by: Sam Protsenko <[email protected]>
Signed-off-by: Tudor Ambarus <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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Change the return type of the s3c24xx_serial_rx_fifocnt() method to
``unsigned int`` as the method only returns the fifo size and does not
handle error codes.
Reviewed-by: Sam Protsenko <[email protected]>
Signed-off-by: Tudor Ambarus <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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s3c24xx_serial_console_txrdy() returned just 0 or 1 to indicate whether
the TX is empty or not. Change its return type to bool.
Reviewed-by: Sam Protsenko <[email protected]>
Signed-off-by: Tudor Ambarus <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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s3c24xx_serial_txempty_nofifo() returned either 0 or BIT(2), which is
counterintuitive. Make the method return bool, and return true when TX
is empty and false otherwise.
Reviewed-by: Sam Protsenko <[email protected]>
Signed-off-by: Tudor Ambarus <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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The bitwise AND with the fifo mask is used to check if the fifo is empty
or not, it doesn't care about the length, thus the comparison with zero
is implicit. Rely on the implicit comparison instead.
Reviewed-by: Sam Protsenko <[email protected]>
Signed-off-by: Tudor Ambarus <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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``max_count`` negative values are not used. Since ``port->fifosize``
is an unsigned int, make ``max_count`` the same.
Reviewed-by: Sam Protsenko <[email protected]>
Signed-off-by: Tudor Ambarus <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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The comment brings no benefit as we can already see from the method's
name, ``s3c24xx_serial_pm``, that it deals with power management.
Drop the superfluous comment.
Reviewed-by: Sam Protsenko <[email protected]>
Signed-off-by: Tudor Ambarus <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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Move open brace '{' following function definition on the next line.
Reviewed-by: Sam Protsenko <[email protected]>
Signed-off-by: Tudor Ambarus <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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Braces {} are not necessary for single statement blocks.
Remove braces on single statement block.
Reviewed-by: Sam Protsenko <[email protected]>
Signed-off-by: Tudor Ambarus <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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All registers of the IP have 32 bits. Use u32 variables when reading
or writing from/to the registers. The purpose of those variables becomes
clearer.
Reviewed-by: Sam Protsenko <[email protected]>
Signed-off-by: Tudor Ambarus <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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samsung_tty.c uses u32 and relies on <linux/console.h> to include
<linux/types.h>. Explicitly include <linux/types.h>. We shall aim to
have the driver self contained.
Reviewed-by: Sam Protsenko <[email protected]>
Signed-off-by: Tudor Ambarus <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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Sorting headers alphabetically helps locating duplicates,
and makes it easier to figure out where to insert new headers.
Reviewed-by: Sam Protsenko <[email protected]>
Signed-off-by: Tudor Ambarus <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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The entire bus (PERIC) on which the GS101 serial resides only allows
32-bit register accesses. The reg-io-width dt property is disallowed
for the "google,gs101-uart" compatible and instead the iotype is
inferred from the compatible. Always set UPIO_MEM32 iotype for the
gs101 earlycon.
Reviewed-by: Peter Griffin <[email protected]>
Reviewed-by: Krzysztof Kozlowski <[email protected]>
Reviewed-by: Sam Protsenko <[email protected]>
Signed-off-by: Tudor Ambarus <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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GS101's Connectivity Peripheral blocks (peric0/1 blocks) which
include the I3C and USI (I2C, SPI, UART) only allow 32-bit
register accesses.
Instead of specifying the reg-io-width = 4 everywhere, for each node,
the requirement should be deduced from the compatible.
Infer UPIO_MEM32 iotype from the "google,gs101-uart" compatible.
Update the uart info name to be GS101 specific in order to
differentiate from the other exynos platforms. All the other settings
are not changed.
exynos_fifoszdt_serial_drv_data was replaced by gs101_serial_drv_data
because the iotype restriction is gs101 specific and there was no other
user of exynos_fifoszdt_serial_drv_data.
Reviewed-by: Peter Griffin <[email protected]>
Reviewed-by: Krzysztof Kozlowski <[email protected]>
Reviewed-by: Sam Protsenko <[email protected]>
Signed-off-by: Tudor Ambarus <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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GS101's Connectivity Peripheral blocks (peric0/1 blocks) which
include the I3C and USI (I2C, SPI, UART) only allow 32-bit
register accesses. If using 8-bit register accesses, a SError
Interrupt is raised causing the system unusable.
Instead of specifying the reg-io-width = 4 everywhere, for each node,
the requirement should be deduced from the compatible.
Prepare the samsung tty driver to allow IO types different than
UPIO_MEM. ``struct uart_port::iotype`` is an unsigned char where all
its 8 bits are exposed to uapi. We can't make NULL checks on it to
verify if it's set, thus always set it from the driver's data.
Use u8 for the ``iotype`` member of ``struct s3c24xx_uart_info`` to
emphasize that the iotype is an 8 bit mask.
Reviewed-by: Krzysztof Kozlowski <[email protected]>
Reviewed-by: Sam Protsenko <[email protected]>
Signed-off-by: Tudor Ambarus <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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The core expects for tx_empty() either TIOCSER_TEMT when the tx is
empty or 0 otherwise. s3c24xx_serial_txempty_nofifo() might return
0x4, and at least uart_get_lsr_info() tries to clear exactly
TIOCSER_TEMT (BIT(1)). Fix tx_empty() to return TIOCSER_TEMT.
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Tudor Ambarus <[email protected]>
Reviewed-by: Sam Protsenko <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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Fix indentation and add line after do/while() block.
Reviewed-by: Andy Shevchenko <[email protected]>
Signed-off-by: Hugo Villeneuve <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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Add comments about I2C slave address structure, and reformat to
improve readability.
Also reformat some comments according to kernel coding style.
Reviewed-by: Andy Shevchenko <[email protected]>
Signed-off-by: Hugo Villeneuve <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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Fixes the following checkpatch warnings:
WARNING: Prefer 'unsigned int' to bare use of 'unsigned'
With this change, the affected functions now match the prototypes in
struct gpio_chip.
Reviewed-by: Andy Shevchenko <[email protected]>
Signed-off-by: Hugo Villeneuve <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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Simplify driver by defining a common function to handle the power
control of all variants.
Reviewed-by: Andy Shevchenko <[email protected]>
Signed-off-by: Hugo Villeneuve <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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Simplify driver by defining a common function to handle the detection
of all variants.
Reviewed-by: Andy Shevchenko <[email protected]>
Signed-off-by: Hugo Villeneuve <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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GENMASK() is preferred when defining bitmasks.
Of all the masks changed, only MAX310x_REV_MASK is actually used.
No functional change.
Reviewed-by: Andy Shevchenko <[email protected]>
Signed-off-by: Hugo Villeneuve <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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Replace dev_err() with dev_err_probe().
This helps in simplifing code and standardizing the error output.
Reviewed-by: Andy Shevchenko <[email protected]>
Signed-off-by: Hugo Villeneuve <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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Allows to simplify code by removing the break statement in the default
switch/case in some functions.
Suggested-by: Andy Shevchenko <[email protected]>
Reviewed-by: Andy Shevchenko <[email protected]>
Signed-off-by: Hugo Villeneuve <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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Simplify error handling and only call uart_remove_one_port() if line bit
is set, instead of having to manually set s->p[i].port.dev to NULL.
Reviewed-by: Andy Shevchenko <[email protected]>
Signed-off-by: Hugo Villeneuve <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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Use a separate regmap name for each port so they can each have their own
debugfs entry, allowing to access each port registers independently.
For example, a four channels/ports device like the MAX14830 will have four
entries in its regmap debugfs:
$ find /sys/kernel/debug/regmap -type d | grep spi0.0
/sys/kernel/debug/regmap/spi0.0-port0
/sys/kernel/debug/regmap/spi0.0-port1
/sys/kernel/debug/regmap/spi0.0-port2
/sys/kernel/debug/regmap/spi0.0-port3
Cc: Jan Kundrát <[email protected]>
Link: https://lore.kernel.org/all/[email protected]/
Reviewed-by: Andy Shevchenko <[email protected]>
Signed-off-by: Hugo Villeneuve <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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Add macro to hold the maximum number of UART ports per IC/device.
Reviewed-by: Andy Shevchenko <[email protected]>
Reviewed-by: Jan Kundrát <[email protected]>
Tested-by: Jan Kundrát <[email protected]>
Link: https://lore.kernel.org/all/[email protected]/
Signed-off-by: Hugo Villeneuve <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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Running pahole shows that there are some holes within the
max310x_devtype structure.
Remove holes and optimize alignment by reorganizing structure members.
This can also lead to data structure size reduction for some CPUs.
On 64-bit CPU (arm64):
Before:
/* size: 40, cachelines: 1, members: 6 */
/* sum members: 34, holes: 2, sum holes: 6 */
/* last cacheline: 40 bytes */
After:
/* size: 40, cachelines: 1, members: 6 */
/* padding: 6 */
/* last cacheline: 40 bytes */
On 32-bit CPU (i386):
Before:
/* size: 32, cachelines: 1, members: 6 */
/* sum members: 26, holes: 2, sum holes: 6 */
/* last cacheline: 32 bytes */
After:
/* size: 24, cachelines: 1, members: 8 */
/* padding: 2 */
/* last cacheline: 24 bytes */
Suggested-by: Andy Shevchenko <[email protected]>
Reviewed-by: Andy Shevchenko <[email protected]>
Signed-off-by: Hugo Villeneuve <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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Replace g with q.
Helpful when grepping thru source code or logs for
"request" keyword.
Fixes: f65444187a66 ("serial: New serial driver MAX310X")
Reviewed-by: Andy Shevchenko <[email protected]>
Signed-off-by: Hugo Villeneuve <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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Use preferred spi_get_device_match_data() instead of
device_get_match_data() and spi_get_device_id() to get the driver match
data.
Suggested-by: Andy Shevchenko <[email protected]>
Reviewed-by: Andy Shevchenko <[email protected]>
Signed-off-by: Hugo Villeneuve <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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Use preferred i2c_get_match_data() instead of device_get_match_data()
to get the driver match data.
Suggested-by: Andy Shevchenko <[email protected]>
Reviewed-by: Andy Shevchenko <[email protected]>
Signed-off-by: Hugo Villeneuve <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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This allows to instantiate a max14830 I2C device from userspace.
Helpful when testing driver with i2c-stub.
Reviewed-by: Andy Shevchenko <[email protected]>
Signed-off-by: Hugo Villeneuve <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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When trying to instantiate a max14830 device from userspace:
echo max14830 0x60 > /sys/bus/i2c/devices/i2c-2/new_device
we get the following error:
Unable to handle kernel NULL pointer dereference at virtual address...
...
Call trace:
max310x_i2c_probe+0x48/0x170 [max310x]
i2c_device_probe+0x150/0x2a0
...
Add check for validity of devtype to prevent the error, and abort probe
with a meaningful error message.
Fixes: 2e1f2d9a9bdb ("serial: max310x: implement I2C support")
Cc: [email protected]
Reviewed-by: Andy Shevchenko <[email protected]>
Signed-off-by: Hugo Villeneuve <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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Since STM32MP25, FIFO size could vary regarding the STM32MPxx version.
So we get this size from "hwcfgr1" register and compute threshold values
corresponding to the ratio given by reference manual.
As STM32MP1x, STM32MP25 and STM32H7 share the same compatible and STM32H7
doesn't have a register to get FIFO size, we force FIFO size to 16 in case
of zero read from hwcfgr1 register.
Signed-off-by: Valentin Caron <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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USART has registers above 0xff offset, so extend variable type to u16.
And change UNDEF_REG to 0xffff.
Signed-off-by: Valentin Caron <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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