Merge tag 'tty-4.19-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 tty and serial driver pull request for 4.19-rc1.

  It's not all that big, just a number of small serial driver updates
  and fixes, along with some better vt handling for unicode characters
  for those using braille terminals.

  All of these patches have been in linux-next for a long time with no
  reported issues"

* tag 'tty-4.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty: (73 commits)
  tty: serial: 8250: Revert NXP SC16C2552 workaround
  serial: 8250_exar: Read INT0 from slave device, too
  tty: rocket: Fix possible buffer overwrite on register_PCI
  serial: 8250_dw: Add ACPI support for uart on Broadcom SoC
  serial: 8250_dw: always set baud rate in dw8250_set_termios
  dt-bindings: serial: Add binding for uartlite
  tty: serial: uartlite: Add support for suspend and resume
  tty: serial: uartlite: Add clock adaptation
  tty: serial: uartlite: Add structure for private data
  serial: sh-sci: Improve support for separate TEI and DRI interrupts
  serial: sh-sci: Remove SCIx_RZ_SCIFA_REGTYPE
  serial: sh-sci: Allow for compressed SCIF address
  serial: sh-sci: Improve interrupts description
  serial: 8250: Use cached port name directly in messages
  serial: 8250_exar: Drop unused variable in pci_xr17v35x_setup()
  vt: drop unused struct vt_struct
  vt: avoid a VLA in the unicode screen scroll function
  vt: add /dev/vcsu* to devices.txt
  vt: coherence validation code for the unicode screen buffer
  vt: selection: take screen contents from uniscr if available
  ...

1 files changed, 10 insertions, 4 deletions

diff --git a/drivers/tty/serial/max310x.c b/drivers/tty/serial/max310x.c
index efe55a1a0615..3db48fcd6068 100644
--- a/drivers/tty/serial/max310x.c
+++ b/drivers/tty/serial/max310x.c
@@ -531,8 +531,8 @@ static int max310x_update_best_err(unsigned long f, long *besterr)
 	return 1;
 }
 
-static int max310x_set_ref_clk(struct max310x_port *s, unsigned long freq,
-			       bool xtal)
+static int max310x_set_ref_clk(struct device *dev, struct max310x_port *s,
+			       unsigned long freq, bool xtal)
 {
 	unsigned int div, clksrc, pllcfg = 0;
 	long besterr = -1;
@@ -588,8 +588,14 @@ static int max310x_set_ref_clk(struct max310x_port *s, unsigned long freq,
 	regmap_write(s->regmap, MAX310X_CLKSRC_REG, clksrc);
 
 	/* Wait for crystal */
-	if (pllcfg && xtal)
+	if (xtal) {
+		unsigned int val;
 		msleep(10);
+		regmap_read(s->regmap, MAX310X_STS_IRQSTS_REG, &val);
+		if (!(val & MAX310X_STS_CLKREADY_BIT)) {
+			dev_warn(dev, "clock is not stable yet\n");
+		}
+	}
 
 	return (int)bestfreq;
 }
@@ -1260,7 +1266,7 @@ static int max310x_probe(struct device *dev, struct max310x_devtype *devtype,
 				   MAX310X_MODE1_AUTOSLEEP_BIT);
 	}
 
-	uartclk = max310x_set_ref_clk(s, freq, xtal);
+	uartclk = max310x_set_ref_clk(dev, s, freq, xtal);
 	dev_dbg(dev, "Reference clock set to %i Hz\n", uartclk);
 
 	mutex_init(&s->mutex);