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authorMaciej W. Rozycki <macro@orcam.me.uk>2021-06-10 20:38:48 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2021-06-16 09:20:29 +0200
commit788847839873ebe9fdf107f86e7e9928515ffbee (patch)
tree2253c33f30bd590528bd48dfe89560aa10ad66ba /arch/mips/mti-malta
parentf7adc73878187be895e8790033cea1fb59ffbc16 (diff)
downloadlinux-788847839873ebe9fdf107f86e7e9928515ffbee.tar.bz2
MIPS: Malta: Enable magic multipliers for Super I/O UARTs
The SMSC FDC37M817 Super I/O chip has a configuration feature that lets it support special UART divisor values of 32770 and 32769 for bit rates of 230400 and 460800 bits per second respectively. Our 8250 driver core provides support for these special divisors via the UPF_MAGIC_MULTIPLIER flag, and YAMON firmware unconditionally configures the Super I/O chip with these divisors enabled as well, so all we need to do in platform setup for these bit rates to work is to set the flag. Signed-off-by: Maciej W. Rozycki <macro@orcam.me.uk> Link: https://lore.kernel.org/r/alpine.DEB.2.21.2105182249380.3032@angie.orcam.me.uk Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/mips/mti-malta')
-rw-r--r--arch/mips/mti-malta/malta-platform.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/mips/mti-malta/malta-platform.c b/arch/mips/mti-malta/malta-platform.c
index 11e9527c6e44..ee7471984fe7 100644
--- a/arch/mips/mti-malta/malta-platform.c
+++ b/arch/mips/mti-malta/malta-platform.c
@@ -33,7 +33,8 @@
.irq = int, \
.uartclk = 1843200, \
.iotype = UPIO_PORT, \
- .flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST, \
+ .flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST | \
+ UPF_MAGIC_MULTIPLIER, \
.regshift = 0, \
}