diff options
| author | Raul E Rangel <rrangel@chromium.org> | 2021-05-21 17:04:28 -0600 |
|---|---|---|
| committer | Patrick Georgi <pgeorgi@google.com> | 2021-05-30 20:28:41 +0000 |
| commit | 43aa527eecbf272e179a09b0c3313636b0e6e19c (patch) | |
| tree | 7c78f66d6824217c65eabd2bbc3f6321ab17f611 /src/soc | |
| parent | 203698a4cb9101e9c649c990579a197c6693e2a0 (diff) | |
soc/amd/common/block/espi: Explicitly assert PLTRST#
PLTRST# is currently asserted and latched when eSPI_RST# gets asserted.
If eSPI_RST# isn't used on a platform or it doesn't properly assert
in all cases, then PLTRST# will never be asserted. This could result in
the AP and EC being out of sync.
BUG=b:188188172, b:188935533
TEST=Warm reset guybrush with partial #22 rework. Verify that peripheral
channel is correctly reset.
Signed-off-by: Raul E Rangel <rrangel@chromium.org>
Change-Id: I20d12edf3efc6100096e24aa8d1aec76bbde264f
Reviewed-on: https://review.coreboot.org/c/coreboot/+/54884
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Rob Barnes <robbarnes@google.com>
Diffstat (limited to 'src/soc')
| -rw-r--r-- | src/soc/amd/common/block/lpc/espi_util.c | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/src/soc/amd/common/block/lpc/espi_util.c b/src/soc/amd/common/block/lpc/espi_util.c index e6ae2cb505..b724408022 100644 --- a/src/soc/amd/common/block/lpc/espi_util.c +++ b/src/soc/amd/common/block/lpc/espi_util.c @@ -563,7 +563,7 @@ static int espi_send_reset(void) return espi_send_command(&cmd); } -static int espi_send_pltrst_deassert(const struct espi_config *mb_cfg) +static int espi_send_pltrst(const struct espi_config *mb_cfg, bool assert) { struct espi_cmd cmd = { .hdr0 = { @@ -573,7 +573,8 @@ static int espi_send_pltrst_deassert(const struct espi_config *mb_cfg) }, .data = { .byte0 = ESPI_VW_INDEX_SYSTEM_EVENT_3, - .byte1 = ESPI_VW_SIGNAL_HIGH(ESPI_VW_PLTRST), + .byte1 = assert ? ESPI_VW_SIGNAL_LOW(ESPI_VW_PLTRST) + : ESPI_VW_SIGNAL_HIGH(ESPI_VW_PLTRST), }, }; @@ -1006,9 +1007,15 @@ int espi_setup(void) return -1; } + /* Assert PLTRST# if VW channel is enabled by mainboard. */ + if (espi_send_pltrst(cfg, true) == -1) { + printk(BIOS_ERR, "Error: PLTRST# assertion failed!\n"); + return -1; + } + /* De-assert PLTRST# if VW channel is enabled by mainboard. */ - if (espi_send_pltrst_deassert(cfg) == -1) { - printk(BIOS_ERR, "Error: PLTRST deassertion failed!\n"); + if (espi_send_pltrst(cfg, false) == -1) { + printk(BIOS_ERR, "Error: PLTRST# deassertion failed!\n"); return -1; } |