- 03 Feb, 2017 7 commits
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Ulrich Hecht authored
To allow operation with a higher RX FIFO interrupt threshold in PIO mode, it is necessary to consider the DR bit ("FIFO not full, but no data received for 1.5 frames") as an indicator that data can be read. Otherwise the driver will let data rot in the FIFO until the threshold is reached. Signed-off-by:Ulrich Hecht <ulrich.hecht+renesas@gmail.com> Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Ulrich Hecht authored
Defines the bits controlling FIFO thresholds, adds the additional HSCIF registers to the register map. Signed-off-by:
Geert Uytterhoeven <geert+renesas@glider.be> Signed-off-by:
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Dmitry Torokhov authored
Instead of open-coding loop with of_find_node_by_type(), let's use canned macro. Signed-off-by:
Dmitry Torokhov <dmitry.torokhov@gmail.com> Signed-off-by:
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Sudeep Holla authored
Commit c7cef0a8 ("console: Add extensible console matching") added match() method to struct console which allows the console to perform console command line matching instead of (or in addition to) default console matching (ie., by fixed name and index). Commit ad1696f6 ("ACPI: parse SPCR and enable matching console") introduced support for SPCR as matching console. Commit 10879ae5 ("serial: pl011: add console matching function") added the match method for pl011 console which checks for the console string to be "pl011" Now on a platform which has both SPCR in the ACPI tables and ttyAMA in the command line, the ttyAMA is chosen as "selected console" but it doesn't pass the matching console method which results in CON_CONSDEV not being set on the "selected console". As a result of that, the bootconsole(SPCR in the above case) is not unregistered and all the beginning boot messages are seen twice. This patch adds "ttyAMA" so that it's considered to match pl011 console. Fixes: 10879ae5 ("serial: pl011: add console matching function") Cc: Russell King <linux@armlinux.org.uk> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Jiri Slaby <jslaby@suse.com> Cc: Peter Hurley <peter@hurleysoftware.com> Cc: Aleksey Makarov <aleksey.makarov@linaro.org> Signed-off-by:
Sudeep Holla <sudeep.holla@arm.com> Signed-off-by:
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남영민 authored
Ensure that the uart clock is enabled prior to writing to the interrupt mask register in s3c24xx_serial_resume_noirq function. Without enabing the uart clock, the uart register cannot be accessed. Signed-off-by:
Youngmin Nam <youngmin.nam@samsung.com> Signed-off-by:
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Sudip Mukherjee authored
Remove the Exar specific codes from 8250_pci and blacklist those chips so that the new Exar serial driver binds to the devices. Reviewed-by:
Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by:
Sudip Mukherjee <sudip.mukherjee@codethink.co.uk> Signed-off-by:
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Sudip Mukherjee authored
Add the serial driver for the Exar chips. And also register the platform device for the GPIO provided by the Exar chips. Reviewed-by:
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- 31 Jan, 2017 2 commits
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Fabio Estevam authored
When userspace passes the SER_RS485_RTS_ON_SEND flag it means that the CTS_B pin should go to logic level high before the transmission begins. CTS_B goes to logic level high when both CTSC and CTS bits are cleared. When userspace passes the SER_RS485_RTS_AFTER_SEND flag it means that the CTS_B pin should go to logic level low after the transmission finishes. CTS_B goes to logic level low when CTSC bit is cleared and CTS bit is set. So fix the CTS_B polarity logic. Signed-off-by:
Fabio Estevam <fabio.estevam@nxp.com> Signed-off-by:
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Fabio Estevam authored
On a board that needs to drive RTS GPIO high in order to enable the transmission of a RS485 transceiver the following description is passed in the devide tree: &uart4 { pinctrl-names = "default"; pinctrl-0 = <&pinctrl_uart4>; rts-gpios = <&gpio6 2 GPIO_ACTIVE_HIGH>; status = "okay"; }; and userspace configures the uart port as follows: /* enable RS485 mode: */ rs485conf.flags |= SER_RS485_ENABLED; /* set logical level for RTS pin equal to 1 when sending: */ rs485conf.flags |= SER_RS485_RTS_ON_SEND; /* set logical level for RTS pin equal to 0 after sending: */ rs485conf.flags &= ~(SER_RS485_RTS_AFTER_SEND); However the RTS GPIO polarity observed in the oscilloscope is inverted. When the SER_RS485_RTS_ON_SEND flag is set the imx_port_rts_active() function should be called and following the same logic when SER_RS485_RTS_AFTER_SEND flag is cleared the imx_port_rts_inactive() should be called. Do such logic change so that RS485 communication in half duplex can work successfully when the RTS GPIO pin is passed via device tree. Signed-off-by:
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- 27 Jan, 2017 3 commits
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Arnd Bergmann authored
During build testing, I ran into a warning in a driver that I had written myself at some point: drivers/tty/serial/8250/8250_of.c: In function 'of_platform_serial_probe': drivers/tty/serial/8250/8250_of.c:233:1: error: the frame size of 1200 bytes is larger than 1152 bytes [-Werror=frame-larger-than=] This is harmless by itself, but it shows two other problems in the driver: - It still tries to be generic enough to handle all kinds of serial ports, where in reality the driver has been 8250-only for a while, and every other uart has its own DT support - As a result of that generalization, we keep two copies of 'struct uart_port' on the stack during probe(). This is completely unnessary. Removing the last code dealing with unsupported port_type values solves both problems nicely, and reduces the stack size. Signed-off-by:
Arnd Bergmann <arnd@arndb.de> Signed-off-by:
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Geert Uytterhoeven authored
As the function header of sci_parse_dt() is split in an unusual way, "git diff" gets confused when changes to the body of the function are made, and attributes them to the wrong function. Reformat the function header to fix this. Signed-off-by:
Simon Horman <horms+renesas@verge.net.au> Signed-off-by:
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Bhumika Goyal authored
Declare uart_ops structures as const as they are only stored in the ops field of an uart_port structure. This field is of type const, so uart_ops structures having this property can be made const too. File size details before and after patching. First line of every .o file shows the file size before patching and second line shows the size after patching. text data bss dec hex filename 2977 456 64 3497 da9 drivers/tty/serial/amba-pl010.o 3169 272 64 3505 db1 drivers/tty/serial/amba-pl010.o 3109 456 0 3565 ded drivers/tty/serial/efm32-uart.o 3301 272 0 3573 df5 drivers/tty/serial/efm32-uart.o 10668 753 1 11422 2c9e drivers/tty/serial/icom.o 10860 561 1 11422 2c9e drivers/tty/serial/icom.o 23904 408 8 24320 5f00 drivers/tty/serial/ioc3_serial.o 24088 224 8 24320 5f00 drivers/tty/serial/ioc3_serial.o 10516 560 4 11080 2b48 drivers/tty/serial/ioc4_serial.o 10709 368 4 11081 2b49 drivers/tty/serial/ioc4_serial.o 7853 648 1216 9717 25f5 drivers/tty/serial/mpsc.o 8037 456 1216 9709 25ed drivers/tty/serial/mpsc.o 10248 456 0 10704 29d0 drivers/tty/serial/omap-serial.o 10440 272 0 10712 29d8 drivers/tty/serial/omap-serial.o 8122 532 1984 10638 298e drivers/tty/serial/pmac_zilog.o 8306 340 1984 10630 2986 drivers/tty/serial/pmac_zilog.o 3808 456 0 4264 10a8 drivers/tty/serial/pxa.o 4000 264 0 4264 10a8 drivers/tty/serial/pxa.o 21781 3864 0 25645 642d drivers/tty/serial/serial-tegra.o 22037 3608 0 25645 642d drivers/tty/serial/serial-tegra.o 2481 456 96 3033 bd9 drivers/tty/serial/sprd_serial.o 2673 272 96 3041 be1 drivers/tty/serial/sprd_serial.o 5534 300 512 6346 18ca drivers/tty/serial/vr41xx_siu.o 5630 204 512 6346 18ca drivers/tty/serial/vr41xx_siu.o 6730 1576 128 8434 20f2 drivers/tty/serial/vt8500_serial.o 6986 1320 128 8434 20f2 drivers/tty/serial/vt8500_serial.o Cross compiled for mips architecture. 3005 488 0 3493 da5 drivers/tty/serial/pnx8xxx_uart.o 3189 304 0 3493 da5 drivers/tty/serial/pnx8xxx_uart.o 4272 196 1056 5524 1594 drivers/tty/serial/dz.o 4368 100 1056 5524 1594 drivers/tty/serial/dz.o 6551 144 16 6711 1a37 drivers/tty/serial/ip22zilog.o 6647 48 16 6711 1a37 drivers/tty/serial/ip22zilog.o 9612 428 1520 11560 2d28 drivers/tty/serial/serial_txx9.o 9708 332 1520 11560 2d28 drivers/tty/serial/serial_txx9.o 4156 296 16 4468 1174 drivers/tty/serial/ar933x_uart.o 4252 200 16 4468 1174 drivers/tty/serial/ar933x_uart.o Cross compiled for arm archiecture. 11716 1780 44 13540 34e4 drivers/tty/serial/sirfsoc_uart.o 11808 1688 44 13540 34e4 drivers/tty/serial/sirfsoc_uart.o 13352 596 56 14004 36b4 drivers/tty/serial/amba-pl011.o 13444 504 56 14004 36b4 drivers/tty/serial/amba-pl011.o Cross compiled for sparc architecture. 4664 528 32 5224 1468 drivers/tty/serial/sunhv.o 4848 344 32 5224 1468 drivers/tty/serial/sunhv.o 8080 332 28 8440 20f8 drivers/tty/serial/sunzilog.o 8184 228 28 8440 20f8 drivers/tty/serial/sunzilog.o Cross compiled for ia64 architecture. 10226 549 472 11247 2bef drivers/tty/serial/sn_console.o 10414 365 472 11251 2bf3 drivers/tty/serial/sn_console.o The files drivers/tty/serial/zs.o, drivers/tty/serial/lpc32xx_hs.o and drivers/tty/serial/lantiq.o did not compile. Signed-off-by:
Bhumika Goyal <bhumirks@gmail.com> Signed-off-by:
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- 25 Jan, 2017 7 commits
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Manuel Schölling authored
The impact of the persistent scrollback feature on the code size is rather small, so the config option is removed. The feature stays disabled by default and can be enabled by using the boot command line parameter 'vgacon.scrollback_persistent=1' or by setting VGACON_SOFT_SCROLLBACK_PERSISTENT_ENABLE_BY_DEFAULT=y. Signed-off-by:
Manuel Schölling <manuel.schoelling@gmx.de> Suggested-by:
Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com> Signed-off-by:
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Manuel Schölling authored
Add a scrollback buffers for each VGA console. The benefit is that the scrollback history is not flushed when switching between consoles but is persistent. The buffers are allocated on demand when a new console is opened. This breaks tools like clear_console that rely on flushing the scrollback history by switching back and forth between consoles which is why this feature is disabled by default. Use the escape sequence \e[3J instead for flushing the buffer. Signed-off-by:
Andrey Utkin <andrey_utkin@fastmail.com> Tested-by:
Adam Borowski <kilobyte@angband.pl> Signed-off-by:
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Manuel Schölling authored
This new callback is in preparation for persistent scrollback buffer support for VGA consoles. With a single scrollback buffer for all consoles, we could flush the buffer just by invocating consw->con_switch(). But when each VGA console has its own scrollback buffer, we need a new callback to tell the video console driver which buffer to flush. Signed-off-by:
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Manuel Schölling authored
This refactoring is in preparation for persistent scrollback support for VGA console. Signed-off-by:
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Tony Lindgren authored
Otherwise the interconnect related code implementing PM runtime will produce these errors on a failed probe: omap_uart 48066000.serial: omap_device: omap_device_enable() called from invalid state 1 omap_uart 48066000.serial: use pm_runtime_put_sync_suspend() in driver? Note that we now also need to check for priv in omap8250_runtime_suspend() as it has not yet been registered if probe fails. And we need to use pm_runtime_put_sync() to properly idle the device like we already do in omap8250_remove(). Fixes: 61929cf0 ("tty: serial: Add 8250-core based omap driver") Signed-off-by:
Tony Lindgren <tony@atomide.com> Signed-off-by:
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Paul Gortmaker authored
Currently this warning is triggered for allmodconfig on m68k. It is well intentioned, in that if you are building the driver but not enabling one of the platforms where the hardware exists, you get a warning. The warning dates back to pre-git days, and now we have COMPILE_TEST so we can use that to mask the warning for people who are obviously just doing build coverage on tree wide changes. Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Jiri Slaby <jslaby@suse.com> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: linux-m68k@lists.linux-m68k.org Cc: linux-serial@vger.kernel.org Signed-off-by:
Paul Gortmaker <paul.gortmaker@windriver.com> Signed-off-by:
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Yasir-Khan authored
This patch adds xilinx uart loopback support by modifying the cdns_uart_set_mctrl function to handle the switch to loopback mode. After this patch, the loopback mode can be enabled/disabled by setting/clearing the TIOCM_LOOP modem bit via TIOCMBIS/TIOCMBIC ioctls respectively. Signed-off-by:
Yasir-Khan <yasir_khan@mentor.com> Signed-off-by:
Michal Simek <michal.simek@xilinx.com> Signed-off-by:
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- 20 Jan, 2017 3 commits
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Vignesh R authored
8250 UART DMA support was marked broken by default as it was not possible to pause ongoing RX DMA transfer. Now that both SDMA and EDMA can support pause operation for RX DMA transactions, don't set rx_dma_broken to true by default. With this patch 8250_omap driver will use DMA by default. Signed-off-by:
Vignesh R <vigneshr@ti.com> Acked-by:
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Vignesh R authored
UART uses as EDMA as dma engine on AM437x SoC and therefore, requires OMAP_DMA_TX_KICK quirk just like AM33xx. So, enable OMAP_DMA_TX_KICK quirk for AM437x platform as well. While at that, drop use of of_machine_is_compatible() and instead pass quirks via device data. Signed-off-by:
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Vignesh R authored
It is possible that DMA transfer is already complete but, completion handler is yet to be called, when dmaengine_pause() is called in case of error condition(like break/rx timeout). This leads to dmaengine_pause() API to return EINVAL (as descriptor is already NULL) causing rx_dma_broken flag to be set and effectively disabling RX DMA. Fix this by calling dmaengine_pause() only when transfer is in progress. Signed-off-by:
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- 19 Jan, 2017 18 commits
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Rob Herring authored
This is needed to work with the client operations which uses const ptrs. Really, the flags pointer could be const, too, but this would be a tree wide fix. Signed-off-by:
Rob Herring <robh@kernel.org> Reviewed-by:
Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-By:
Sebastian Reichel <sre@kernel.org> Signed-off-by:
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Rob Herring authored
tty_register_device is just a wrapper for tty_register_device_attr with NULL passed for drvdata and attr_grp. So similarly make tty_port_register_device a wrapper of tty_port_register_device_attr so that additions don't have to be made in both functions. Signed-off-by:
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Alan Cox authored
Let us create tty objects entirely in kernel space. Untested proposal to show why all the ideas around rewriting half the uart stack are not needed. With this a kernel created non file backed tty object could be used to handle data, and set terminal modes. Not all ldiscs can cope with this as N_TTY in particular has to work back to the fs/tty layer. The tty_port code is however otherwise clean of file handles as far as I can tell as is the low level tty port write path used by the ldisc, the configuration low level interfaces and most of the ldiscs. Currently you don't have any exposure to see tty hangups because those are built around the file layer. However a) it's a fixed port so you probably don't care about that b) if you do we can add a callback and c) you almost certainly don't want the userspace tear down/rebuild behaviour anyway. This should however be sufficient if we wanted for example to enumerate all the bluetooth bound fixed ports via ACPI and make them directly available. It doesn't deal with the case of a user opening a port that's also kernel opened and that would need some locking out (so it returned EBUSY if bound to a kernel device of some kind). That needs resolving along with how you "up" or "down" your new bluetooth device, or enumerate it while providing the existing tty API to avoid regressions (and to debug). Signed-off-by:
Alan Cox <alan@linux.intel.com> Reviewed-by:
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Martin Blumenstingl authored
The vendor driver allows setting baud-rates higher than 115200 baud. There is a check in the vendor driver which prevents using more than 115200 baud during startup, however it does not have such a check in .set_termios. Higher baud-rates are often used by the bluetooth modules embedded into the SDIO wifi chips (Amlogic devices use brcmfmac based wifi chips quite often, 2000000 baud seems to be a common value for the UART baud-rate in Amlogic's "libbt"). I have tested this on a Meson GXL device with uart_A (to which the bluetooth module is connected, where initialization times out with 115200 baud) and uart_AO (which I manually set to 2000000 baud and then connected with my USB UART adapter to that). Signed-off-by:
Martin Blumenstingl <martin.blumenstingl@googlemail.com> Acked-by:
Kevin Hilman <khilman@baylibre.com> Tested-by:
Andreas Färber <afaerber@suse.de> Signed-off-by:
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Rob Herring authored
For in-kernel tty users, we need to be able to create and destroy 'struct tty' that are not associated with a file. The creation side is fine, but tty_release() needs to be split into the file handle portion and the struct tty portion. Introduce a new function, tty_release_struct, to handle just the destroying of a struct tty. Signed-off-by:
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Arvind Yadav authored
Here, If ioremap_nocache will fail. It will return NULL. Kernel can run into a NULL-pointer dereference. This error check will avoid NULL pointer dereference. Signed-off-by:
Arvind Yadav <arvind.yadav.cs@gmail.com> Signed-off-by:
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Lokesh Vutla authored
Add DT earlycon for omap_serial driver. This boot console is included with CONFIG_SERIAL_EARLYCON=y, CONFIG_OF=y, CONFIG_SERIAL_OMAP=y, and CONFIG_OF_EARLY_FLATTREE=y. This boot console is enabled with the command line option "earlycon" (without "=<name>...") when the DT 'stdout-path' property matches a compatible uart. Signed-off-by:
Lokesh Vutla <lokeshvutla@ti.com> Signed-off-by:
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Alexander Sverdlin authored
Exactly as in a80c49db ("serial8250: Mark console as CON_ANYTIME"), to enable printk() during CPU hot-plugging. Actually most of the serial console drivers do not use per-cpu resources and can be marked as CON_ANYTIME. Signed-off-by:
Alexander Sverdlin <alexander.sverdlin@nokia.com> Cc: Russell King <linux@armlinux.org.uk> Cc: Jiri Slaby <jslaby@suse.com> Cc: linux-serial@vger.kernel.org Signed-off-by:
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Bhumika Goyal authored
Declare dev_pm_ops structures as const as they are only stored in the pm field of a device_driver structure. This field is of type const, so dev_pm_ops structures having similar properties can be declared const too. Size details after cross compiling the .o file for blackfin architecture. File size before: text data bss dec hex filename 3572 320 16 3908 f44 tty/serial/bfin_sport_uart.o File size after: text data bss dec hex filename 3664 228 16 3908 f44 tty/serial/bfin_sport_uart.o Signed-off-by:
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Andy Shevchenko authored
There is no need to set PCI bus mastering when device is not doing any DMA. It includes MSI type of interrupts. Currently only UART on Denverton, which is DMA capable, might have MSI enabled. Taking above into account enable bus mastering for Denverton case only. Reviewed-by:
Heikki Krogerus <heikki.krogerus@linux.intel.com> Reviewed-by:
Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by:
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Andy Shevchenko authored
Enable MSI type of interrupt if PCI BIOS supports it. Reviewed-by:
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Andy Shevchenko authored
Starting from Tangier B0 and continuing on Anniedale the HSU DMA interrupt line is actually shared with UART. Handling them independently is racy and quite often comes with the following traceback. irq 54: nobody cared (try booting with the "irqpoll" option) CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.9.0-rc6-edison64-86244934+ #1 Hardware name: Intel Corporation Merrifield/BODEGA BAY, BIOS 542 2015.01.21:18.19.48 ffff88003f203eb0 ffffffff8130e718 ffff880032627000 ffff88003262709c ffff88003f203ed8 ffffffff810a3960 ffff880032627000 0000000000000000 ffff880032627000 ffff88003f203f10 ffffffff810a3cc7 ffff880032627000 Call Trace: <IRQ> [<ffffffff8130e718>] dump_stack+0x4d/0x65 [<ffffffff810a3960>] __report_bad_irq+0x30/0xc0 [<ffffffff810a3cc7>] note_interrupt+0x227/0x270 [<ffffffff810a1380>] handle_irq_event_percpu+0x40/0x50 [<ffffffff810a13b7>] handle_irq_event+0x27/0x50 [<ffffffff810a42d5>] handle_fasteoi_irq+0x85/0x150 [<ffffffff8101d7fe>] handle_irq+0x6e/0x120 [<ffffffff8105b8bc>] ? _local_bh_enable+0x1c/0x50 [<ffffffff8101d0d6>] do_IRQ+0x46/0xd0 [<ffffffff818cef3f>] common_interrupt+0x7f/0x7f <EOI> [<ffffffff818cdead>] ? mwait_idle+0x7d/0x140 [<ffffffff81024c9a>] arch_cpu_idle+0xa/0x10 [<ffffffff818ce150>] default_idle_call+0x20/0x30 [<ffffffff810908fd>] cpu_startup_entry+0x16d/0x1d0 [<ffffffff818c882d>] rest_init+0x6d/0x70 [<ffffffff81f93e8f>] start_kernel+0x3e2/0x3ef [<ffffffff81f9343d>] x86_64_start_reservations+0x38/0x3a [<ffffffff81f93529>] x86_64_start_kernel+0xea/0xed handlers: [<ffffffff81411670>] serial8250_interrupt Disabling IRQ #54 Fix this by handling interrupt only in one place. The issue is discussed here: https://github.com/andy-shev/linux/issues/5 Moreover this also fixes another bug when Rx DMA returns wrong residue and we can't rely on it. Reviewed-by:
Vinod Koul <vinod.koul@intel.com> Signed-off-by:
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Jason Uy authored
In the most common use case, the Synopsys DW UART driver does not set the set_termios callback function. This prevents UPSTAT_AUTOCTS from being set when the UART flag CRTSCTS is set. As a result, the driver will use software flow control as opposed to hardware flow control. To fix the problem, the set_termios callback function is set to the DW specific function. The logic to set UPSTAT_AUTOCTS is moved so that any clock error will not affect setting the hardware flow control. Reviewed-by:
Scott Branden <scott.branden@broadcom.com> Reviewed-by:
Ray Jui <ray.jui@broadcom.com> Signed-off-by:
Jason Uy <jason.uy@broadcom.com> Reviewed-by:
Kefeng Wang <wangkefeng.wang@huawei.com> Reviewed-by:
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Laurent Pinchart authored
SCI instances found in SH SoCs have different spacing between registers depending on the SoC. The platform data contains a regshift field that tells the driver by how many bits to shift the register offset to compute its address. We can compute the regshift value automatically based on the memory resource size, there's no need to pass the value through platform data. Fix the sh7750 SCI and sh7760 SIM port memory resources length to ensure proper computation of the regshift value. Signed-off-by:
Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> Reviewed-by:
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Laurent Pinchart authored
The field isn't set by any platform but is only used internally in the driver to hold data parsed from DT. Move it to the sci_port structure. Signed-off-by:
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Laurent Pinchart authored
The sh-sci driver implements manual break debouncing for a few SH platforms by reading the value of the RX pin port register. This feature is optional and the driver considers all negative or zero values of the platform data port_reg field as invalid. As the four platforms that set the field to a register address all use an address higher than 0x7fffffff, the driver will always consider the value as invalid and never perform debouncing. The feature is unused, remove it. Debouncing could be implemented properly in the future using the pinctrl and GPIO APIs if desired. Signed-off-by:
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Laurent Pinchart authored
Only SH platforms still use platform data for the sh-sci, and none of them declare DMA channels connected to the SCI. Remove the corresponding platform data fields and simplify the driver accordingly. Signed-off-by:
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Laurent Pinchart authored
The fifo size, overrun register and mask, sampling rate mask and error mask all depend on the port type only and don't need to be computed at runtime. Add them to the sci_port_parameters structure. Signed-off-by:
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