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| author | Felix Held <felix-coreboot@felixheld.de> | 2021-12-07 00:38:29 +0100 |
|---|---|---|
| committer | Felix Held <felix-coreboot@felixheld.de> | 2021-12-08 13:44:27 +0000 |
| commit | 688f09f97ad5b25e3374653eebafbb5220032feb (patch) | |
| tree | 4673e452e1a8757ad7c4b77b0641235c3be5c522 /src/soc/amd | |
| parent | 09cdecec9c22a0cd63b1f7d7906b5abc78443064 (diff) | |
soc/amd/stoneyridge/southbridge: fix setting SPI_USE_SPI100
Use a read modify write sequence when setting the SPI_USE_SPI100 bit in
the SPI100_ENABLE register. This avoids clearing other bits in the
register which might cause instabilities of the SPI interface. The
reference code for Stoneyrige also only sets the SPI_USE_SPI100 bit and
doesn't zero out the other bits.
TEST=None
Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: I4d32fc2084bb34ea57924bae68511c6836587790
Reviewed-on: https://review.coreboot.org/c/coreboot/+/59933
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Diffstat (limited to 'src/soc/amd')
| -rw-r--r-- | src/soc/amd/stoneyridge/southbridge.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/src/soc/amd/stoneyridge/southbridge.c b/src/soc/amd/stoneyridge/southbridge.c index de27ac540a..63bfd832b3 100644 --- a/src/soc/amd/stoneyridge/southbridge.c +++ b/src/soc/amd/stoneyridge/southbridge.c @@ -242,7 +242,7 @@ void sb_set_spi100(u16 norm, u16 fast, u16 alt, u16 tpm) (fast << SPI_FAST_SPEED_NEW_SH) | (alt << SPI_ALT_SPEED_NEW_SH) | (tpm << SPI_TPM_SPEED_NEW_SH)); - spi_write16(SPI100_ENABLE, SPI_USE_SPI100); + spi_write16(SPI100_ENABLE, SPI_USE_SPI100 | spi_read16(SPI100_ENABLE)); } static void sb_disable_4dw_burst(void) |