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linux-stable/drivers/tty/serial/8250
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Vignesh Raghavendra b67e830d38 serial: 8250: 8250_omap: Fix possible interrupt storm on K3 SoCs 
On K3 family of SoCs (which includes AM654 SoC), it is observed that RX
TIMEOUT is signalled after RX FIFO has been drained, in which case a
dummy read of RX FIFO is required to clear RX TIMEOUT condition.
Otherwise, this would lead to an interrupt storm.

Fix this by introducing UART_RX_TIMEOUT_QUIRK flag and doing a dummy
read in IRQ handler when RX TIMEOUT is reported with no data in RX FIFO.

Fixes: be70874498 ("serial: 8250_omap: Add support for AM654 UART controller")
Reported-by: Jan Kiszka <jan.kiszka@siemens.com>
Tested-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
Link: https://lore.kernel.org/r/20210622145704.11168-1-vigneshr@ti.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-06-24 14:51:33 +02:00
..
8250.h serial: 8250: Use BIT(x) for UART_{CAP,BUG}_* 2021-05-20 17:14:50 +02:00
8250_accent.c
8250_acorn.c
8250_aspeed_vuart.c Merge 5.13-rc4 into tty-next 2021-05-31 09:44:28 +02:00
8250_bcm2835aux.c serial: 8250: Simplify with dev_err_probe() 2020-09-04 17:14:29 +02:00
8250_bcm7271.c serial: 8250: Make symbol 'brcmuart_debugfs_root' static 2021-04-02 16:12:27 +02:00
8250_boca.c
8250_core.c tty/serial: make port of serial8250_register_8250_port const 2021-05-20 16:59:14 +02:00
8250_dma.c
8250_dw.c serial: 8250_dw: Add device HID for new AMD UART controller 2021-05-13 17:08:42 +02:00
8250_dwlib.c
8250_dwlib.h
8250_early.c tty: serial: 8250: 8250_port: Move prototypes to shared location 2020-11-13 15:28:12 +01:00
8250_em.c
8250_exar.c Linux 5.13-rc6 2021-06-14 09:14:43 +02:00
8250_exar_st16c554.c
8250_fintek.c
8250_fourport.c
8250_fsl.c serial: do not restore interrupt state in sysrq helper 2021-04-22 12:04:26 +02:00
8250_gsc.c
8250_hp300.c
8250_hub6.c
8250_ingenic.c serial: 8250: Simplify with dev_err_probe() 2020-09-04 17:14:29 +02:00
8250_ioc3.c
8250_lpc18xx.c
8250_lpss.c
8250_men_mcb.c
8250_mid.c
8250_mtk.c serial: 8250-mtk: Fix reference leak in mtk8250_probe 2020-11-26 21:19:58 +01:00
8250_of.c serial: 8250: of: Check for CONFIG_SERIAL_8250_BCM7271 2021-05-13 16:22:48 +02:00
8250_omap.c serial: 8250: 8250_omap: Fix possible interrupt storm on K3 SoCs 2021-06-24 14:51:33 +02:00
8250_pci.c serial: 8250: Correct the clock for OxSemi PCIe devices 2021-06-16 09:20:29 +02:00
8250_pnp.c
8250_port.c serial: 8250: Handle custom baud rates in UPF_MAGIC_MULTIPLIER range 2021-06-16 09:20:29 +02:00
8250_pxa.c
8250_tegra.c 8250_tegra: clean up tegra_uart_handle_break 2021-01-07 16:17:31 +01:00
8250_uniphier.c
Kconfig serial: extend compile-test coverage 2021-04-22 13:12:13 +02:00
Makefile serial: 8250: Add new 8250-core based Broadcom STB driver 2021-03-26 15:18:30 +01:00
serial_cs.c serial_cs: Add Option International GSM-Ready 56K/ISDN modem 2021-06-16 09:20:29 +02:00