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Commit 97fb8dbf authored by Joe Burmeister's avatar Joe Burmeister Committed by Greg Kroah-Hartman
Browse files

tty: max310x: Fix external crystal register setup 



commit 5d24f455c182d5116dd5db8e1dc501115ecc9c2c upstream.

The datasheet states:

  Bit 4: ClockEnSet the ClockEn bit high to enable an external clocking
(crystal or clock generator at XIN). Set the ClockEn bit to 0 to disable
clocking
  Bit 1: CrystalEnSet the CrystalEn bit high to enable the crystal
oscillator. When using an external clock source at XIN, CrystalEn must
be set low.

The bit 4, MAX310X_CLKSRC_EXTCLK_BIT, should be set and was not.

This was required to make the MAX3107 with an external crystal on our
board able to send or receive data.

Signed-off-by: default avatarJoe Burmeister <joe.burmeister@devtank.co.uk>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 2e6514aa

drivers/tty/serial/max310x.c

+1 −1
Original line number Diff line number Diff line
@@ -579,7 +579,7 @@ static int max310x_set_ref_clk(struct max310x_port *s, unsigned long freq, 
	}



	/* Configure clock source */

	clksrc = xtal ? MAX310X_CLKSRC_CRYST_BIT : MAX310X_CLKSRC_EXTCLK_BIT;

	clksrc = MAX310X_CLKSRC_EXTCLK_BIT | (xtal ? MAX310X_CLKSRC_CRYST_BIT : 0);



	/* Configure PLL */

	if (pllcfg) {