diff options
| author | Paul Menzel <pmenzel@molgen.mpg.de> | 2020-10-12 01:29:12 +0200 |
|---|---|---|
| committer | Nico Huber <nico.h@gmx.de> | 2020-10-17 13:34:33 +0000 |
| commit | 138c1b864bf9745f084e2b7035204aaa3b5b983c (patch) | |
| tree | 775256f6708a903b0454822606207fc9eca36e35 /src/superio | |
| parent | ffbb4b2b11f2bb875fbaca0137615b592ba0cd9c (diff) | |
superio/nuvoton: Only set bit 7 of global CR 0x2a for COM A
Currently, when selecting SUPERIO_NUVOTON_NCT*_COM_A, the whole global
control register 0x2a is written to 0x40. CR 0x2a defaults to 0xc0, so
indeed bit 7 is cleared, but the device early init code might have set
other bits in that control register, so setting it to 0x40 might
override already set bits. So, only clear bit 7 and leave the other bits
untouched.
Fixes: f95daa510d ("superio/nuvoton: Add back Nuvoton NCT6776 support")
Change-Id: I9ded9dab3985c4c8e5c45af354ef44af482e18c2
Signed-off-by: Paul Menzel <pmenzel@molgen.mpg.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/46286
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Diffstat (limited to 'src/superio')
| -rw-r--r-- | src/superio/nuvoton/common/early_serial.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/src/superio/nuvoton/common/early_serial.c b/src/superio/nuvoton/common/early_serial.c index cc21f40d2a..ed5fdbab1f 100644 --- a/src/superio/nuvoton/common/early_serial.c +++ b/src/superio/nuvoton/common/early_serial.c @@ -55,7 +55,7 @@ void nuvoton_enable_serial(pnp_devfn_t dev, u16 iobase) if (CONFIG(SUPERIO_NUVOTON_NCT5539D_COM_A) || CONFIG(SUPERIO_NUVOTON_NCT6776_COM_A)) /* Route COM A to GPIO8 pin group */ - pnp_write_config(dev, 0x2a, 0x40); + pnp_unset_and_set_config(dev, 0x2a, 1 << 7, 0); if (CONFIG(SUPERIO_NUVOTON_NCT6791D_COM_A)) /* Route COM A to GPIO8 pin group */ |