| Age | Commit message (Collapse) | Author |
|---|
|
To allow other code to safely read DMA Channel Status Register (where
the register attribute for Channel Error, Descriptor Time Out &
Descriptor Done fields are read-clear), export hsu_dma_get_status().
hsu_dma_irq() is renamed to hsu_dma_do_irq() and requires Status
Register value to be passed in.
Signed-off-by: Chuah, Kim Tatt <kim.tatt.chuah@intel.com>
Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
|
|
When using the 8250 as a boot console and the main console results in
messages being printed twice. The console framework will only
unregister boot consoles if a new console is registered with the
CON_CONSDEV flag set.
Set this flag for the univ8250 console to prevent double-registration.
Signed-off-by: Matthew Leach <matthew.leach@codethink.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
|
|
This driver makes use of the __set_bit() and __clear_bit() functions.
When running under big-endian, these functions don't convert the bit
indexes when working with peripheral registers, leading to the
incorrect bits being set and cleared when running big-endian.
Add two new driver functions for setting and clearing bits that are
byte-order aware.
Signed-off-by: Matthew Leach <matthew@mattleach.net>
Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
|
|
Fix the serial access code to deal with kernels built for big endian
operation.
Signed-off-by: Matthew Leach <matthew@mattleach.net>
Acked-by: Ben Dooks <ben.dooks@codethink.co.uk>
Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
|
|
The fifo mask functions should be static as they are not
used outside of the driver. Fix the following warnings by
making them static:
drivers/tty/serial/sirfsoc_uart.h:109:5: warning: symbol 'uart_usp_ff_full_mask' was not declared. Should it be static?
drivers/tty/serial/sirfsoc_uart.h:117:5: warning: symbol 'uart_usp_ff_empty_mask' was not declared. Should it be static?
Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
|
|
The Kconfig currently controlling compilation of mps2-uart is:
config SERIAL_MPS2_UART
bool "MPS2 UART port"
depends on ARM || COMPILE_TEST
...meaning that it currently is not being built as a module by anyone.
Follow commit 89ebc2742769 ("drivers/tty: make serial/mvebu-uart.c
explicitly non-modular") as an example of moving modular code to
non-modular:
- remove the modular code that is essentially orphaned, so that
when reading the driver there is no doubt it is builtin-only.
- explicitly disallow a driver unbind, since that doesn't have a
sensible use case anyway, and it allows us to drop the ".remove"
code for non-modular drivers.
- use arch_initcall instead of module_init and remove module_exit.
Also note that MODULE_DEVICE_TABLE is a no-op for non-modular code.
We also delete the MODULE_LICENSE tag etc. since all that information
was (or is now) contained at the top of the file in the comments.
Reported-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
|
|
As suggested by the serial port infrastructure documentation, the IRQ is
requested in ->startup(). However, it is never freed in the ->shutdown()
hook.
With simple systems that open the serial port once for all and always
have at least one process that keep the serial port opened, there was no
problem. But with a more complicated system (*cough* systemd *cough*),
the serial port is opened/closed many times, which at some point no
processes having the serial port open at all. Due to this ->startup()
gets called again, tries to request_irq() again, which fails.
Fixes: 30530791a7a0 ("serial: mvebu-uart: initial support for Armada-3700 serial port")
Cc: <stable@vger.kernel.org>
Cc: Ofer Heifetz <oferh@marvell.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
|
|
The bcm63xx_uart driver uses the of alias for determing its id. Recent
changes in dts files changed the expected 'uartX' to the recommended
'serialX', breaking serial output. Fix this by checking for a 'serialX'
alias as well.
Fixes: e3b992d028f8 ("MIPS: BMIPS: Improve BCM6328 device tree")
Fixes: 2d52ee82b475 ("MIPS: BMIPS: Improve BCM6368 device tree")
Fixes: 7537d273e2f3 ("MIPS: BMIPS: Add device tree example for BCM6358")
Signed-off-by: Jonas Gorski <jogo@openwrt.org>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
|
|
The Kconfig currently controlling compilation of this code is:
drivers/tty/serial/Kconfig:config SERIAL_M32R_SIO
drivers/tty/serial/Kconfig: bool "M32R SIO I/F"
...meaning that it currently is not being built as a module by anyone.
Lets remove the modular code that is essentially orphaned, so that
when reading the driver there is no doubt it is builtin-only.
Since module_init translates to device_initcall in the non-modular
case, the init ordering remains unchanged with this commit.
We also delete the MODULE_LICENSE tag etc. since all that information
is already contained at the top of the file in the comments.
We don't replace module.h with init.h since the file already has that.
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jiri Slaby <jslaby@suse.com>
Cc: linux-serial@vger.kernel.org
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
|
|
The Kconfig currently controlling compilation of this code is:
drivers/tty/serial/Kconfig:config SERIAL_VT8500
drivers/tty/serial/Kconfig: bool "VIA VT8500 on-chip serial port support"
...meaning that it currently is not being built as a module by anyone.
Lets remove the modular code that is essentially orphaned, so that
when reading the driver there is no doubt it is builtin-only.
We explicitly disallow a driver unbind, since that doesn't have a
sensible use case anyway, and it allows us to drop the ".remove"
code for non-modular drivers.
Since module_init translates to device_initcall in the non-modular
case, the init ordering remains unchanged with this commit.
We don't replace module.h with init.h since the file already has that.
We also delete the MODULE_LICENSE tag etc. since all that information
is already contained at the top of the file in the comments.
Cc: Tony Prisk <linux@prisktech.co.nz>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jiri Slaby <jslaby@suse.com>
Cc: Alexey Charkov <alchark@gmail.com>
Cc: linux-serial@vger.kernel.org
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
|
|
The Kconfig currently controlling compilation of this code is:
drivers/tty/serial/Kconfig:config SERIAL_PXA
drivers/tty/serial/Kconfig: bool "PXA serial port support"
...meaning that it currently is not being built as a module by anyone.
Lets remove the modular code that is essentially orphaned, so that
when reading the driver there is no doubt it is builtin-only.
We explicitly disallow a driver unbind, since that doesn't have a
sensible use case anyway, and it allows us to drop the ".remove"
code for non-modular drivers.
Since module_init translates to device_initcall in the non-modular
case, the init ordering remains unchanged with this commit.
Also note that MODULE_DEVICE_TABLE and MODULE_ALIAS are both a
no-op for non-modular builds.
We also delete the MODULE_LICENSE tag since that information is
already contained at the top of the file in the comments.
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jiri Slaby <jslaby@suse.com>
Cc: linux-serial@vger.kernel.org
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
|
|
Add COMPILE_TEST for the compilation test coverage.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
|
|
This patch makes assignment of port line automatically,
so now user allow to use several MAX310X chips.
Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
|
|
Add uart_remove_one_port() for error path.
Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
|
|
Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
|
|
This patch moves UART registration at module_init initcall,
so this should helps to add multiple chip support in the future.
Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
|
|
Use resource managed functions devm_gpiochip_add_data() to make
error & exit path a bit simpler.
Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
|
|
RS485 IOCTLs uses spinlocks, so move regmap functions into a separate
work queue.
Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
|
|
Adds support for the WCH CH355 4S card in the 8250 serial driver.
Signed-off-by: Alexandr Petrenko <petrenkoas83@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
|
|
On non-DeviceTree platforms, the index of serial device is a static
variable incremented on each probe. It is incremented even if deferred
probe happens when getting the clock in s3c24xx_serial_init_port().
This index is used for referencing elements of statically allocated
s3c24xx_serial_ports array. In case of re-probe, the index will point
outside of this array leading to memory corruption.
Increment the index only on successful probe.
Reported-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Fixes: b497549a035c ("[ARM] S3C24XX: Split serial driver into core and per-cpu drivers")
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
|
|
When the clk_get() of "uart" clock returns EPROBE_DEFER, the next re-probe
finishes with success but uses invalid (ERR_PTR) values. This leads to
dereferencing of ERR_PTR stored under ourport->clk:
12c30000.serial: Controller clock not found
(...)
12c30000.serial: ttySAC3 at MMIO 0x12c30000 (irq = 61, base_baud = 0) is a S3C6400/10
Unable to handle kernel paging request at virtual address fffffdfb
(clk_prepare) from [<c039f7d0>] (s3c24xx_serial_pm+0x20/0x128)
(s3c24xx_serial_pm) from [<c0395414>] (uart_change_pm+0x38/0x40)
(uart_change_pm) from [<c039689c>] (uart_add_one_port+0x31c/0x44c)
(uart_add_one_port) from [<c03a035c>] (s3c24xx_serial_probe+0x2a8/0x418)
(s3c24xx_serial_probe) from [<c03ee110>] (platform_drv_probe+0x50/0xb0)
(platform_drv_probe) from [<c03ecb44>] (driver_probe_device+0x1f4/0x2b0)
(driver_probe_device) from [<c03eb0c0>] (bus_for_each_drv+0x44/0x8c)
(bus_for_each_drv) from [<c03ec8c8>] (__device_attach+0x9c/0x100)
(__device_attach) from [<c03ebf54>] (bus_probe_device+0x84/0x8c)
(bus_probe_device) from [<c03ec388>] (deferred_probe_work_func+0x60/0x8c)
(deferred_probe_work_func) from [<c012fee4>] (process_one_work+0x120/0x328)
(process_one_work) from [<c0130150>] (worker_thread+0x2c/0x4ac)
(worker_thread) from [<c0135320>] (kthread+0xd8/0xf4)
(kthread) from [<c0107978>] (ret_from_fork+0x14/0x3c)
The first unsuccessful clk_get() causes s3c24xx_serial_init_port() to
exit with failure but the s3c24xx_uart_port is left half-configured
(e.g. port->mapbase is set, clk contains ERR_PTR). On next re-probe,
the function s3c24xx_serial_init_port() will exit early with success
because of configured port->mapbase and driver will use old values,
including the ERR_PTR as clock.
Fix this by cleaning the port->mapbase on error path so each re-probe
will initialize all of the port settings.
Fixes: 60e93575476f ("serial: samsung: enable clock before clearing pending interrupts during init")
Cc: <stable@vger.kernel.org>
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Reviewed-by: Javier Martinez Canillas <javier@osg.samsung.com>
Tested-by: Javier Martinez Canillas <javier@osg.samsung.com>
Tested-by: Kevin Hilman <khilman@baylibre.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
|
|
Some BIOS only use _OSI("Linux") to distinguish between Linux & Windows.
Apply Level/Low to UART trigger mode if Windows, Edge/High mode otherwise.
But since 2.6.23 the mainline kernel no longer returns true for
_OSI(“Linux”).
The default IRQ0~15 trigger mode in Linux is Edge/High mode without
ACPI MADT override. It mismatches IRQ mode and makes UART malfunctional on
such motherboard.
This patch will check the current IRQ mode and apply correct mode to UART.
The following link is F81216AD spec PDF:
http://html.alldatasheet.com/html-pdf/257956/FINTEK/F81216AD/5569/
25/F81216AD.html
LDN0~3
70h: IRQ channel & Mode register
Bit 6~5 :
00 : Active low level mode
01 : Active high edge mode
Bit 4 : Sharing Flag (0: not share/1: share)
Bit 3~0 : IRQ channel
Signed-off-by: Ji-Ze Hong (Peter Hong) <hpeter+linux_kernel@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
|
|
Submitters of device tree binding documentation may forget to CC
the subsystem maintainer if this is missing.
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: linux-serial@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
|
|
Allocated memory for 'sport->irq_fault_name' is freed twice, first
in error check of 'if(!sport->irq_rx_name)' and other in fallback
handler.
Signed-off-by: Purna Chandra Mandal <purna.mandal@microchip.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
|
|
Currently the clocks are enabled at probe and disabled
at remove. Instead enable the clocks when used.
Signed-off-by: Shubhrajyoti Datta <shubhraj@xilinx.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
|
|
When using DMA, half duplex doesn't work properly because rx is not stopped
before starting tx. Ensure we call atmel_stop_rx() in the DMA case.
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
|
|
There is a macro named ATMEL_SERIAL_RINGSIZE which suggesting that it
corresponds to the real size of the ring buffer. Let warn people that
there is a factor of four since allocation size is
sizeof(struct atmel_uart_char) * ATMEL_SERIAL_RINGSIZE.
Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
|
|
Split TX and RX paths to not schedule RX tasklet on TX events and vice versa.
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
|
|
The IRQ status check and related actions was done in the tasklet without
benefit. So, move it back to the IRQ context to simplify IRQ handling and
having the possibility to split the tasklet in two separated ones for
receive and transmit actions.
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
|
|
Use memdup_user to duplicate a memory region from user-space to
kernel-space, instead of open coding using kmalloc & copy_from_user.
Signed-off-by: Muhammad Falak R Wani <falakreyaz@gmail.com>
Reviewed-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
|
|
Doing the following UART bind/unbind sequence on a i.mx platform causes
a kernel crash due to NULL pointer dereference:
echo 21f4000.serial > /sys/bus/platform/drivers/imx-uart/bind
echo 21f4000.serial > /sys/bus/platform/drivers/imx-uart/unbind
Fix this problem by adding NULL checks prior to calling release/request_port
ops.
Reported-by: Fugang Duan <fugang.duan@nxp.com>
Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Tested-by: Fugang Duan <fugang.duan@nxp.com>
Acked-by: Fugang Duan <fugang.duan@nxp.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
|
|
Enabling support for the UART on the ARM MPS2 platform only make sense
when compiling for the ARM MPS2 platform, unless compile-testing.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Vladimir Murzin <vladimir.murzin@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
|
|
The msm_stop_dma() is not exported from the driver, so make
it static to stop the following warning:
drivers/tty/serial/msm_serial.c:84:6: warning: symbol 'msm_stop_dma' was not declared. Should it be static?
Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk>
Acked-by: Andy Gross <andy.gross@linaro.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
|
|
For dm uarts in pio mode tx data is transferred to the fifo register 4
bytes at a time, but care is not taken when these 4 bytes spans the end
of the xmit buffer so the loop might read up to 3 bytes past the buffer
and then skip the actual data at the beginning of the buffer.
Fix this by, analogous to the DMA case, make sure the chunk doesn't
wrap the xmit buffer.
Fixes: 3a878c430fd6 ("tty: serial: msm: Add TX DMA support")
Cc: Ivan Ivanov <iivanov.xz@gmail.com>
Cc: stable@vger.kernel.org
Reported-by: Frank Rowand <frowand.list@gmail.com>
Reported-by: Nicolas Dechesne <nicolas.dechesne@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Acked-by: Andy Gross <andy.gross@linaro.org>
Tested-by: Frank Rowand <frank.rowand@am.sony.com>
Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
|
|
Avoid data corruption issues that result in CRC errors during file
transfers over serial ports at higher baud rates.
The current msm_serial driver masks the FIFO Rx interrupts in
msm_start_rx_dma() since Rx FIFO interrupts are not required in DMA
mode. However, msm_complete_rx_dma() re-enables the Rx FIFO interrupts
which could cause RXSTALE event to be processed when a TXLEV interrupt
occurs.
The following is the sequence of events that could occur resulting in
data corruption.
msm_start_rx_dma -> msm_complete_rx_dma -->
spin_unlock_irqrestore(&port->lock) -->
msm_uart_irq()(For TXLEV interrupt) --> msm_handle_rx_dm() (Read from
FIFO resulting in data corruption)
The patch fixes the issue by not restoring the RXLEV and RXSTALE
interrupts in msm_complete_rx_dma(). These interrupts are required only
in FIFO mode.
Signed-off-by: Charanya Venkatraman <charanya@codeaurora.org>
Acked-by: Andy Gross <andy.gross@linaro.org>
Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
|
|
The hrtimer include isn't used and neither is serial. Drop those
ones. The irq.h header really should be interrupt.h because this
is an interrupt user and not an interrupt chip. Finally add
wait.h for the wake_up*() usage in this driver and kernel.h for
container_of().
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Acked-by: Andy Gross <andy.gross@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
|
|
The registers that msm_serial_set_mnd_regs() writes only exist on
the non-uartdm hardware, so let's return early here if this
function is called on uartdm hardware. This also prevents us from
messing up the uartclk variable if the uartclk rate happens to be
19.2 or 4.8 MHz.
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Acked-by: Andy Gross <andy.gross@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
|
|
This header file is only used by the driver, so let's merge the
two together to reduce files and make it easier to see the whole
driver without flipping through two files. This also makes it
easier to use the structures defined in msm_serial.c in the
functions that are defined in msm_serial.h by placing them in the
proper locations.
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Acked-by: Andy Gross <andy.gross@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
|
|
Some board like Hisilicon D02 uses Synopsys DesignWare ABP UART, declare an
OF early console for it, so early console device can be enabled with comand
line "earlycon"(without option) via the "stdout-path" property in device-tree.
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Tested-by: Jon Mason <jon.mason@broadcom.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
|
|
Add the missing timeout bit definition for (H)SCIF.
Clear the timeout and overrun flag bits during UART reset, cfr. the
initialization flowchart in the datasheet.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
|
|
Setting the FIFO reset bits is not sufficient to reset the RX FIFO.
After this the status register's RDF flag bit may still be set, causing
the reception of one stale byte of data.
To fix this, clear all status flag bits related to reception, error, and
break handling, cfr. the initialization flowchart in the datasheet.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
|
|
FIFO reset is done in sci_reset(), called from sci_set_termios(), while
sci_start_tx() and sci_start_rx() are called before, from sci_startup().
However, starting transfers before the UART's FIFOs have been reset may
cause reading of stale data.
Remove the calls to sci_start_tx() and sci_start_rx() from sci_startup()
to fix this.
Transfers are still started when needed:
- sci_start_rx() is called from sci_set_termios() after FIFO reset, if
the CREAD flag is set,
- sci_start_tx() is called from uart_change_speed() immediately
thereafter, if transmission is enabled.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
|
|
Signed-off-by: Hiromitsu Yamasaki <hiromitsu.yamasaki.ym@renesas.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
Acked-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
|
|
Add support for indicating the availability of dedicated lines for
RTS/CTS hardware flow control, using the standard "uart-has-rtscts" DT
property.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
|
|
The existing support for hardware-assisted RTS/CTS is rudimentary and
doesn't work.
Add support for hardware-assisted RTS/CTS hardware flow control for the
(H)SCIF, SCIFA, and SCIFB variants.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
|
|
Before, the driver relied on initialization by the boot loader, or by
implicit reset state.
Note that unlike on (H)SCIF, the RTS/CTS bits exist only if dedicated
RTS/CTS pins are available, which depends on the SoC and UART instance.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
|
|
Correct pin initialization on (H)SCIF:
- RTS must be deasserted (it's active low),
- SCK must be an input, as it may be used as the optional external
clock input.
Initial pin configuration must always be done:
- Regardless of the presence of dedicated RTS and CTS pins: if the
register exists, the RTS/CTS bits exist, too,
- Regardless of hardware flow control being enabled or not: RTS must
be deasserted.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
|
|
Improve documentation for the SCIFA/SCIFB Serial Port Control and Data
Registers:
- State clearly that the RTS and CTS lines are active-low,
- Document the bits related to the serial port's SCK, RXD, and TXD
pins.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
|
|
Improve documentation for the (H)SCIF Serial Port Register:
- Make it clear the RTS and CTS lines are active-low,
- Document the bits related to the serial port's clock pin.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
|
|
Replace open-coded variants of sci_getreg() by function calls, and drop
intermediate variables where appropriate.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
|
