Merge tag 'tty-7.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty

Pull tty / serial driver updates from Greg KH:
 "Here is the big set of TTY and Serial driver updates for 7.2-rc1.

  Overall we end up removing more code than added, due to an obsolete
  synclink_gt driver being removed from the tree, always a nice thing to
  see happen.

  Other than that driver removal, major things included in here are:

   - max310x serial driver updates and fixes

   - 8250 driver updates and rework in places to make it more "modern"

   - dts file updates

   - serial driver core tweaks and updates

   - vt code cleanups

   - vc_screen crash fixes

   - other minor driver updates and cleanups

  All of these have been in linux-next for well over a week with no
  reported issues"

* tag 'tty-7.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty: (49 commits)
  serial: 8250_pci: Don't specify conflicting values to pci_device_id members
  vc_screen: fix null-ptr-deref in vcs_notifier() during concurrent vcs_write
  serial: qcom_geni: Fix RX DMA stall when SE_DMA_RX_LEN_IN is zero
  vt: merge ucs_is_zero_width()/ucs_is_double_width() into ucs_get_width()
  serial: 8250: fix possible ISR soft lockup
  dt-bindings: serial: rs485: remove deprecated .txt binding stub
  serial: qcom-geni: trace: Add tracepoint support for Qualcomm GENI serial
  tty: serial: Use named initializers for arrays of i2c_device_data
  serial: 8250_dw: remove clock-notifier infrastructure
  serial: 8250_dw: unregister 8250 port if clk_notifier_register() fails
  amba/serial: amba-pl011: Bring back zx29 UART support
  serial: 8250: Add support for console flow control
  serial: 8250: Check LSR timeout on console flow control
  serial: 8250: Set cons_flow on port registration
  tty: serial: 8250: protect against NULL uart->port.dev in register
  arm64: dts: add support for A9 based Amlogic BY401
  dt-bindings: arm: amlogic: add A311Y3 support
  serial: max310x: fix compile errors if CONFIG_SPI_MASTER is disabled
  serial: qcom-geni: Avoid probing debug console UART without console support
  serial: max310x: add comments for PLL limits
  ...

1 files changed, 20 insertions, 0 deletions

diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index 110ad4e2aef9..bdc214386e4a 100644
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -533,6 +533,7 @@ struct uart_port {
 #define UPF_HARD_FLOW		((__force upf_t) (UPF_AUTO_CTS | UPF_AUTO_RTS))
 /* Port has hardware-assisted s/w flow control */
 #define UPF_SOFT_FLOW		((__force upf_t) BIT_ULL(22))
+/* Deprecated: use uart_set_cons_flow_enabled()/uart_cons_flow_enabled() instead. */
 #define UPF_CONS_FLOW		((__force upf_t) BIT_ULL(23))
 #define UPF_SHARE_IRQ		((__force upf_t) BIT_ULL(24))
 #define UPF_EXAR_EFR		((__force upf_t) BIT_ULL(25))
@@ -567,6 +568,7 @@ struct uart_port {
 #define UPSTAT_SYNC_FIFO	((__force upstat_t) (1 << 5))
 
 	bool			hw_stopped;		/* sw-assisted CTS flow state */
+	bool			cons_flow;		/* user specified console flow control */
 	unsigned int		mctrl;			/* current modem ctrl settings */
 	unsigned int		frame_time;		/* frame timing in ns */
 	unsigned int		type;			/* port type */
@@ -1163,6 +1165,24 @@ static inline bool uart_softcts_mode(struct uart_port *uport)
 	return ((uport->status & mask) == UPSTAT_CTS_ENABLE);
 }
 
+static inline void uart_set_cons_flow_enabled(struct uart_port *uport, bool enabled)
+{
+	uport->cons_flow = enabled;
+}
+
+static inline bool uart_cons_flow_enabled(const struct uart_port *uport)
+{
+	return uport->cons_flow;
+}
+
+static inline bool uart_console_hwflow_active(struct uart_port *uport)
+{
+	return uart_console(uport) &&
+	       !(uport->rs485.flags & SER_RS485_ENABLED) &&
+	       uart_cons_flow_enabled(uport) &&
+	       uart_cts_enabled(uport);
+}
+
 /*
  * The following are helper functions for the low level drivers.
  */