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Samuel Thibault
ffc1e08972 VT: Add height parameter to con_font_get/set consw operations 
The current con_font_get/set API currently hardcodes a 32-pixel-tall
limitation, which only dates from the old VGA hardware which could not
handle taller fonts than that.

This change just adds a vpitch parameter to release this
constraint. Drivers which do not support vpitch != 32 can just return
EINVAL when it is not 32, font loading tools will revert to trying 32
and succeed.

This change makes the fbcon driver consider vpitch appropriately, thus
making it able to load large fonts.

Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Link: https://lore.kernel.org/r/20230119151934.932642243@ens-lyon.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2023-01-19 16:28:56 +01:00
Matthew Gerlach
e34a79d0b3 tty: serial: 8250: add DFL bus driver for Altera 16550. 
Add a Device Feature List (DFL) bus driver for the Altera
16550 implementation of UART.

Signed-off-by: Matthew Gerlach <matthew.gerlach@linux.intel.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Marco Pagani <marpagan@redhat.com>
Link: https://lore.kernel.org/r/20230115151447.1353428-5-matthew.gerlach@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2023-01-19 16:07:40 +01:00
Matthew Gerlach
4747ab89b4 fpga: dfl: add basic support for DFHv1 
Version 1 of the Device Feature Header (DFH) definition adds
functionality to the Device Feature List (DFL) bus.

A DFHv1 header may have one or more parameter blocks that
further describes the HW to SW. Add support to the DFL bus
to parse the MSI-X parameter.

The location of a feature's register set is explicitly
described in DFHv1 and can be relative to the base of the DFHv1
or an absolute address. Parse the location and pass the information
to DFL driver.

Signed-off-by: Matthew Gerlach <matthew.gerlach@linux.intel.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20230115151447.1353428-4-matthew.gerlach@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2023-01-19 16:07:40 +01:00
Basheer Ahmed Muddebihal
0926d8d52d fpga: dfl: Add DFHv1 Register Definitions 
This patch adds the definitions for DFHv1 header and related register
bitfields.

Signed-off-by: Basheer Ahmed Muddebihal <basheer.ahmed.muddebihal@linux.intel.com>
Co-developed-by: Matthew Gerlach <matthew.gerlach@linux.intel.com>
Signed-off-by: Matthew Gerlach <matthew.gerlach@linux.intel.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20230115151447.1353428-3-matthew.gerlach@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2023-01-19 16:07:40 +01:00
Matthew Gerlach
46879f7106 Documentation: fpga: dfl: Add documentation for DFHv1 
Add documentation describing the extensions provided by Version
1 of the Device Feature Header (DFHv1).

Signed-off-by: Matthew Gerlach <matthew.gerlach@linux.intel.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Reviewed-by: Tom Rix <trix@redhat.com>
Link: https://lore.kernel.org/r/20230115151447.1353428-2-matthew.gerlach@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2023-01-19 16:07:40 +01:00
Ilpo Järvinen
2d762dab66 tty: moxa: Rename dtr/rts parameters/variables to active 
Use active consistently for naming parameters and variables.

Reviewed-by: Jiri Slaby <jirislaby@kernel.org>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20230117090358.4796-13-ilpo.jarvinen@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2023-01-19 16:04:35 +01:00
Ilpo Järvinen
5701cb8bf5 tty: Call ->dtr_rts() parameter active consistently 
Convert various parameter names for ->dtr_rts() and related functions
from onoff, on, and raise to active.

Reviewed-by: Jiri Slaby <jirislaby@kernel.org>
Acked-by: Ulf Hansson <ulf.hansson@linaro.org> # For MMC
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20230117090358.4796-12-ilpo.jarvinen@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2023-01-19 16:04:35 +01:00
Ilpo Järvinen
87f22db4c2 tty: Return bool from tty_termios_hw_change() 
Change tty_termios_hw_change() to return bool.

Reviewed-by: Jiri Slaby <jirislaby@kernel.org>
Reviewed-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20230117090358.4796-11-ilpo.jarvinen@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2023-01-19 16:04:35 +01:00
Ilpo Järvinen
968d64578e serial: Make uart_handle_cts_change() status param bool active 
Convert uart_handle_cts_change() to bool which is more appropriate
than unsigned int.

Rename status to active to better describe what the parameter means.
While at it, make the comment about the active parameter easier to
parse.

Cleanup callsites from operations that are not necessary with bool.

Reviewed-by: Jiri Slaby <jirislaby@kernel.org>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20230117090358.4796-10-ilpo.jarvinen@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2023-01-19 16:04:35 +01:00
Ilpo Järvinen
0388a152fc tty/serial: Make ->dcd_change()+uart_handle_dcd_change() status bool active 
Convert status parameter for ->dcd_change() and
uart_handle_dcd_change() to bool which matches to how the parameter is
used.

Rename status to active to better describe what the parameter means.

Acked-by: Rodolfo Giometti <giometti@enneenne.com>
Reviewed-by: Jiri Slaby <jirislaby@kernel.org>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20230117090358.4796-9-ilpo.jarvinen@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2023-01-19 16:04:35 +01:00
Ilpo Järvinen
5d42039907 tty: Convert ->dtr_rts() to take bool argument 
Convert the raise/on parameter in ->dtr_rts() to bool through the
callchain. The parameter is used like bool. In USB serial, there
remains a few implicit bool -> larger type conversions because some
devices use u8 in their control messages.

In moxa_tiocmget(), dtr variable was reused for line status which
requires int so use a separate variable for status.

Reviewed-by: Jiri Slaby <jirislaby@kernel.org>
Acked-by: Ulf Hansson <ulf.hansson@linaro.org> # For MMC
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20230117090358.4796-8-ilpo.jarvinen@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2023-01-19 16:04:35 +01:00
Ilpo Järvinen
b300fb26c5 tty: Convert ->carrier_raised() and callchains to bool 
Return boolean from ->carrier_raised() instead of 0 and 1. Make the
return type change also to tty_port_carrier_raised() that makes the
->carrier_raised() call (+ cd variable in moxa into which its return
value is stored).

Also cleans up a few unnecessary constructs related to this change:

	return xx ? 1 : 0;
	-> return xx;

	if (xx)
		return 1;
	return 0;
	-> return xx;

Reviewed-by: Jiri Slaby <jirislaby@kernel.org>
Acked-by: Ulf Hansson <ulf.hansson@linaro.org> # For MMC
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20230117090358.4796-7-ilpo.jarvinen@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2023-01-19 16:04:35 +01:00
Ilpo Järvinen
dcd794c6ed serial: Convert uart_{,port_}startup() init_hw param to bool 
Convert init_hw parameter in uart_startup() and uart_port_startup() to
bool as code treats them like bool.

Reviewed-by: Jiri Slaby <jirislaby@kernel.org>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20230117090358.4796-6-ilpo.jarvinen@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2023-01-19 16:04:34 +01:00
Ilpo Järvinen
c2ac4bfa04 tty: moxa: Make local var storing tty_port_initialized() bool 
Return type of tty_port_initialized() is bool, use matching type for
the local variable.

Also reorder the local vars to reverse-xmas-tree while at it.

Reviewed-by: Jiri Slaby <jirislaby@kernel.org>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20230117090358.4796-5-ilpo.jarvinen@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2023-01-19 16:04:34 +01:00
Ilpo Järvinen
9b5aa54986 tty: Cleanup tty_port_set_active() bool parameter 
Make callers pass true/false consistently for bool val.

Reviewed-by: Jiri Slaby <jirislaby@kernel.org>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20230117090358.4796-4-ilpo.jarvinen@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2023-01-19 16:04:34 +01:00
Ilpo Järvinen
75b20a2ac4 tty: Cleamup tty_port_set_suspended() bool parameter 
Make callers pass true/false consistently for bool val.

Reviewed-by: Jiri Slaby <jirislaby@kernel.org>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20230117090358.4796-3-ilpo.jarvinen@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2023-01-19 16:04:34 +01:00
Ilpo Järvinen
515be7baed tty: Cleanup tty_port_set_initialized() bool parameter 
Make callers pass true/false consistently for bool val.

Reviewed-by: Samuel Iglesias Gonsalvez <siglesias@igalia.com>
Reviewed-by: Jiri Slaby <jirislaby@kernel.org>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20230117090358.4796-2-ilpo.jarvinen@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2023-01-19 16:04:34 +01:00
Yuan Can
3bec2f77f1 serial: pic32: Add checks for devm_clk_get() in pic32_uart_probe() 
As the devm_clk_get() may return ERR_PTR, its return value needs to be
checked to avoid invalid poineter dereference.

Signed-off-by: Yuan Can <yuancan@huawei.com>
Link: https://lore.kernel.org/r/20221125093832.33386-1-yuancan@huawei.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2023-01-19 16:02:23 +01:00
Christoph Niedermaier
c54d485436 serial: stm32: Add support for rs485 RX_DURING_TX output GPIO 
If a RX_DURING_TX GPIO is defined by the DT property "rs485-rx-during-tx-gpios"
this patch switches this GPIO accordingly to the RS485 flag RX_DURING_TX in user
space. Controlled by this GPIO, now the hardware is responsible for connecting
or disconnecting RX during TX.

Signed-off-by: Christoph Niedermaier <cniedermaier@dh-electronics.com>
Link: https://lore.kernel.org/r/20221202104127.122761-4-cniedermaier@dh-electronics.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2023-01-19 16:01:35 +01:00
Christoph Niedermaier
ca530cfa96 serial: imx: Add support for RS485 RX_DURING_TX output GPIO 
If a RX_DURING_TX GPIO is defined by the DT property "rs485-rx-during-tx-gpios"
this patch switches this GPIO accordingly to the RS485 flag RX_DURING_TX in user
space. In addition, the i.MX UART receiver is no longer turned on and off during
sending, because now the hardware is responsible for connecting or disconnecting
RX during TX controlled by this GPIO.

Signed-off-by: Christoph Niedermaier <cniedermaier@dh-electronics.com>
Link: https://lore.kernel.org/r/20221202104127.122761-3-cniedermaier@dh-electronics.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2023-01-19 16:01:35 +01:00
Christoph Niedermaier
163f080eb7 serial: core: Add option to output RS485 RX_DURING_TX state via GPIO 
This patch provides a generic GPIO variable for outputting the state
of RS485 RX_DURING_TX. The GPIO is defined by the devicetree property
"rs485-rx-during-tx-gpios". To use it in a low level serial driver,
the evaluation of this variable must be implemented there accordingly.

Signed-off-by: Christoph Niedermaier <cniedermaier@dh-electronics.com>
Link: https://lore.kernel.org/r/20221202104127.122761-2-cniedermaier@dh-electronics.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2023-01-19 16:01:35 +01:00
Christoph Niedermaier
45c1d967a7 dt-bindings: serial: rs485: Add GPIO controlling RX enable during TX 
Add a binding for a generic definition of an output GPIO that sets the
state of rs485-rx-during-tx. The idea is that the hardware already controls
the option receiving during sending before it gets to the signal receiving
hardware. The standard RS485 is a half-duplex bus that in most cases is
driven by an UART controller. The advantage of using this GPIO is that it
is independent of the capabilities of the UART core and the UART driver.
On the hardware side the interface to the bus is controlled by a transceiver,
that has a pin called RE (RX Enable) or similar, which connects the bus to
the RX signal of the UART controller. The GPIO can switch between two states
to control the RE pin via an electrical circuit:
- Active:
  The RE pin is always active. The UART RX see everything on the bus and
  therefore also what happens with the TX signal on the bus.
- Inactive:
  The RE pin is always active, but during sending on the bus the pin RE is
  inactive. So basically the receiving during sending is suppressed.

A possible circuit diagram could look like this:
                                  ┌──────────────────┐
                                  │       RS485      │
                TX ───────────────┤D                 │
                                  │    Transceiver   │
               RTS ────┬──────────┤DE                │
                       │          │                  │
                       │ ┌─────┐  │                  │
                       └─┤&    │  │                  │
                         │     ├──┤!RE               │
!rx_during_tx_gpio ──────┤     │  │                  │
                         └─────┘  │                  │
                                  │                  │
                RX ───────────────┤R                 │
                                  │                  │
                                  └──────────────────┘

Here the RTS pin of the UART core is used to control TX via the transceiver
pin DE (Drive Enable). RE and rx_during_tx_gpio are active low.

Signed-off-by: Christoph Niedermaier <cniedermaier@dh-electronics.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20221202104127.122761-1-cniedermaier@dh-electronics.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2023-01-19 16:01:34 +01:00
Yi Yang
38f28cfe9d serial: tegra: Add missing clk_disable_unprepare() in tegra_uart_hw_init() 
Add the missing clk_disable_unprepare() before return from
tegra_uart_hw_init() in the error handling path.
When request_irq() fails in tegra_uart_startup(), 'tup->uart_clk'
has been enabled, fix it by adding clk_disable_unprepare().

Fixes: cc9ca4d958 ("serial: tegra: Only print FIFO error message when an error occurs")
Fixes: d781ec21ba ("serial: tegra: report clk rate errors")
Signed-off-by: Yi Yang <yiyang13@huawei.com>
Link: https://lore.kernel.org/r/20221126020852.113378-1-yiyang13@huawei.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2023-01-19 15:54:01 +01:00
Isaac True
c8f71b49ee serial: sc16is7xx: setup GPIO controller later in probe 
The GPIO controller component of the sc16is7xx driver is setup too
early, which can result in a race condition where another device tries
to utilise the GPIO lines before the sc16is7xx device has finished
initialising.

This issue manifests itself as an Oops when the GPIO lines are configured:

    Unable to handle kernel read from unreadable memory at virtual address
    ...
    pc : sc16is7xx_gpio_direction_output+0x68/0x108 [sc16is7xx]
    lr : sc16is7xx_gpio_direction_output+0x4c/0x108 [sc16is7xx]
    ...
    Call trace:
    sc16is7xx_gpio_direction_output+0x68/0x108 [sc16is7xx]
    gpiod_direction_output_raw_commit+0x64/0x318
    gpiod_direction_output+0xb0/0x170
    create_gpio_led+0xec/0x198
    gpio_led_probe+0x16c/0x4f0
    platform_drv_probe+0x5c/0xb0
    really_probe+0xe8/0x448
    driver_probe_device+0xe8/0x138
    __device_attach_driver+0x94/0x118
    bus_for_each_drv+0x8c/0xe0
    __device_attach+0x100/0x1b8
    device_initial_probe+0x28/0x38
    bus_probe_device+0xa4/0xb0
    deferred_probe_work_func+0x90/0xe0
    process_one_work+0x1c4/0x480
    worker_thread+0x54/0x430
    kthread+0x138/0x150
    ret_from_fork+0x10/0x1c

This patch moves the setup of the GPIO controller functions to later in the
probe function, ensuring the sc16is7xx device has already finished
initialising by the time other devices try to make use of the GPIO lines.
The error handling has also been reordered to reflect the new
initialisation order.

Co-developed-by: Wen-chien Jesse Sung <jesse.sung@canonical.com>
Signed-off-by: Wen-chien Jesse Sung <jesse.sung@canonical.com>
Signed-off-by: Isaac True <isaac.true@canonical.com>
Link: https://lore.kernel.org/r/20221130105529.698385-1-isaac.true@canonical.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2023-01-19 15:53:41 +01:00
Krzysztof Kozlowski
7aa34bb3ae serial: msm: add lock annotation to msm_set_baud_rate() 
msm_set_baud_rate() releases and re-acquires the port->lock, thus add
lock annotation for Sparse static code checks.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20230109152212.343476-1-krzysztof.kozlowski@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2023-01-19 15:53:09 +01:00
Christophe JAILLET
03e30f06e5 serial: sccnxp: Use devm_clk_get_enabled() helper 
The devm_clk_get_enabled() helper:
   - calls devm_clk_get()
   - calls clk_prepare_enable() and registers what is needed in order to
     call clk_disable_unprepare() when needed, as a managed resource.

This simplifies the code.
This also avoids some other warnings/issues. (see [1])

[1]: https://lore.kernel.org/all/20221118233101.never.215-kees@kernel.org/

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Link: https://lore.kernel.org/r/735a807c2df835aa436dcbc76b374f983f89a9af.1672419577.git.christophe.jaillet@wanadoo.fr
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2023-01-19 15:51:28 +01:00
Liang He
6e054678ff serial: ucc_uart: Add of_node_put() in ucc_uart_remove() 
In ucc_uart_probe(), we have added proper of_node_put() in the failure
paths. However, we miss it before we free *qe_port* in the remove() function.

Signed-off-by: Liang He <windhl@126.com>
Link: https://lore.kernel.org/r/20221205085437.1163682-1-windhl@126.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2023-01-19 15:51:09 +01:00
Bartosz Golaszewski
2aaa43c707 tty: serial: qcom-geni-serial: add support for serial engine DMA 
The qcom-geni-serial driver currently only works in SE FIFO mode. This
limits the UART speed to around 180 kB/s. In order to achieve higher
speeds we need to use SE DMA mode.

Keep the console port working in FIFO mode but extend the code to use DMA
for the high-speed port.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Link: https://lore.kernel.org/r/20221229155030.418800-15-brgl@bgdev.pl
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2023-01-19 15:08:26 +01:00
Bartosz Golaszewski
7de06d8455 soc: qcom-geni-se: add more symbol definitions 
The following symbols will be used when adding support for SE DMA in
the qcom geni serial driver.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20221229155030.418800-14-brgl@bgdev.pl
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2023-01-19 15:08:26 +01:00
Bartosz Golaszewski
40ec6d41c8 tty: serial: qcom-geni-serial: use of_device_id data 
Instead of checking the device compatible in probe(), assign the
device-specific data to struct of_device_id. We'll use it later when
providing SE DMA support.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20221229155030.418800-13-brgl@bgdev.pl
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2023-01-19 15:08:25 +01:00
Bartosz Golaszewski
0626afe57b tty: serial: qcom-geni-serial: drop the return value from handle_rx 
The return value of the handle_rx() callback is never checked. Drop it.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20221229155030.418800-12-brgl@bgdev.pl
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2023-01-19 15:08:25 +01:00
Bartosz Golaszewski
bd7955840c tty: serial: qcom-geni-serial: refactor qcom_geni_serial_send_chunk_fifo() 
Shuffle the code a bit, drop unneeded variables, make types of others
more consistent and use uart_xmit_advance() instead of handling
tail->xmit manually.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Link: https://lore.kernel.org/r/20221229155030.418800-11-brgl@bgdev.pl
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2023-01-19 15:08:25 +01:00
Bartosz Golaszewski
d420fb491c tty: serial: qcom-geni-serial: split out the FIFO tx code 
qcom_geni_serial_handle_tx() is pretty big, let's move the code that
handles the actual writing of data to a separate function which makes
sense in preparation for introducing a dma variant of handle_tx().

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Link: https://lore.kernel.org/r/20221229155030.418800-10-brgl@bgdev.pl
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2023-01-19 15:08:25 +01:00
Bartosz Golaszewski
3931b8fdec tty: serial: qcom-geni-serial: remove unneeded tabs 
Remove redundant indentation in struct member assignment.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20221229155030.418800-9-brgl@bgdev.pl
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2023-01-19 15:08:25 +01:00
Bartosz Golaszewski
fe6a00e8fc tty: serial: qcom-geni-serial: refactor qcom_geni_serial_isr() 
Simplify the conditions in qcom_geni_serial_isr() and fix indentation.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20221229155030.418800-8-brgl@bgdev.pl
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2023-01-19 15:08:25 +01:00
Bartosz Golaszewski
2f853f83f4 tty: serial: qcom-geni-serial: remove stray newlines 
Remove stray newlines around #ifdefs for consistency with the rest
of the driver code.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20221229155030.418800-7-brgl@bgdev.pl
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2023-01-19 15:08:25 +01:00
Bartosz Golaszewski
00ce7c6e86 tty: serial: qcom-geni-serial: improve the to_dev_port() macro 
The member we want to resolve in struct qcom_geni_serial_port is called
uport so we don't need an additional redundant parameter in this macro.

While at it: turn the macro into a static inline function.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20221229155030.418800-6-brgl@bgdev.pl
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2023-01-19 15:08:25 +01:00
Bartosz Golaszewski
6cde11dbf4 tty: serial: qcom-geni-serial: align #define values 
Keep the #define symbols aligned for better readability.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20221229155030.418800-5-brgl@bgdev.pl
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2023-01-19 15:08:25 +01:00
Bartosz Golaszewski
68c6bd92c8 tty: serial: qcom-geni-serial: remove unused symbols 
Drop all unused symbols from the driver.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20221229155030.418800-4-brgl@bgdev.pl
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2023-01-19 15:08:25 +01:00
Bartosz Golaszewski
d0fabb0dc1 tty: serial: qcom-geni-serial: drop unneeded forward definitions 
If we shuffle the code a bit, we can drop all forward definitions of
various static functions.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20221229155030.418800-3-brgl@bgdev.pl
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2023-01-19 15:08:25 +01:00
Bartosz Golaszewski
d8aca2f968 tty: serial: qcom-geni-serial: stop operations in progress at shutdown 
We don't stop transmissions in progress at shutdown. This is fine with
FIFO SE mode but with DMA (support for which we'll introduce later) it
causes trouble so fix it now.

Fixes: e83766334f ("tty: serial: qcom_geni_serial: No need to stop tx/rx on UART shutdown")
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20221229155030.418800-2-brgl@bgdev.pl
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2023-01-19 15:08:24 +01:00
Jiri Slaby (SUSE)
bf8baa0066 tty: vt: cache row count in con_scroll() 
It's used on few places, so make the code easier to follow by caching
the subtraction result.

Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20230112080136.4929-11-jirislaby@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2023-01-19 15:06:42 +01:00
Jiri Slaby (SUSE)
424c82af26 tty: vt: saner names for more scroll variables 
Rename more variables (t, b, s, d) -> (top, bottom, src, dst) to make
them more obvious.

Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20230112080136.4929-10-jirislaby@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2023-01-19 15:06:42 +01:00
Jiri Slaby (SUSE)
8aad24ad9d tty: vt: separate array juggling to juggle_array() 
The algorithm used for scrolling is the array juggling. It has
complexity O(N) and space complexity O(1). I.e. quite fast w/o
requirements for temporary storage.

Move the algorithm to a separate function so it is obvious what it is.
It is almost generic (except the array type), so if anyone else wants
array rotation, feel free to make it generic and move it to include/.

And rename all the variables from i, j, k, sz, d, and so on to something
saner.

Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org>
Link: https://lore.kernel.org/r/20230112080136.4929-9-jirislaby@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2023-01-19 15:06:42 +01:00
Jiri Slaby (SUSE)
287696d5b4 tty: vt: simplify some unicode conditions 
After previous patches, we can simply test vc->vc_uni_lines, so do so in
many unicode functions. This makes the code more compact. And even use
  if (!)
    return;
in vc_uniscr_scroll(), so that the whole code is indented on the left.

Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20230112080136.4929-8-jirislaby@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2023-01-19 15:06:42 +01:00
Jiri Slaby (SUSE)
441c938168 tty: vt: replace BUG_ON() by WARN_ON_ONCE() 
No need to panic in vc_uniscr_copy_line(), just warn. This should never
happen though, as vc_uniscr_check() is supposed to be called before
vc_uniscr_copy_line(). And the former checks vc->vc_uni_lines already.

In any case, use _ONCE as vc_uniscr_copy_line() is called repeatedly for
each line. So don't flood the logs, just in case.

Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20230112080136.4929-7-jirislaby@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2023-01-19 15:06:42 +01:00
Jiri Slaby (SUSE)
feb36abbed tty: vt: remove struct uni_screen 
It contains only lines with pointers to characters (u32s). So use
simple clear 'u32 **lines' all over the code.

This avoids zero-length arrays. It also makes the allocation less
error-prone (size of the struct wasn't taken into account at all).

Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20230112080136.4929-6-jirislaby@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2023-01-19 15:06:42 +01:00
Jiri Slaby (SUSE)
0c8414a682 tty: vt: remove char32_t typedef 
It boils down to uint32_t, so use u32 directly, instead. This makes the
code more obvious.

Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20230112080136.4929-5-jirislaby@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2023-01-19 15:06:42 +01:00
Jiri Slaby (SUSE)
4ba77bfbad tty: vt: use sizeof(*variable) where possible 
Instead of sizeof(type), use sizeof(*variable) which is preferred. We
are going to remove the unicode's char32_t typedef, so this makes the
switch easier.

Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org>
Link: https://lore.kernel.org/r/20230112080136.4929-4-jirislaby@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2023-01-19 15:06:42 +01:00
Jiri Slaby (SUSE)
70caeac76d tty: vt: remove reference to undefined NO_VC_UNI_SCREEN 
NO_VC_UNI_SCREEN is defined nowhere. Remove the last reference to it.

Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20230112080136.4929-3-jirislaby@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2023-01-19 15:06:41 +01:00