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Gate peci_available on ESPI availability

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This commit is contained in:
Jeremy Soller
2023-02-24 11:04:15 -07:00
parent fc1fda0725
commit 962d55309a
1 changed files with 10 additions and 3 deletions
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13
src/board/system76/common/peci.c
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@ -65,10 +65,17 @@ void peci_init(void) {}
// Returns true if peci is available // Returns true if peci is available
bool peci_available(void) { bool peci_available(void) {
// PECI is available if PLTRST_N is high // If ESPI_RESET# (named BUF_PLT_RST_N) is low, PECI is not available
// Do not wake CPU from C10 if HOST_C10 virtual wire is high // This is because no ESPI transactions will be possible
if (!gpio_get(&BUF_PLT_RST_N)) return false;
// If VW_PLTRST_N virtual wire is not VWS_HIGH, PECI is not available
// This is because the CPU has not yet exited reset
if (vw_get(&VW_PLTRST_N) != VWS_HIGH) return false;
// If VW_HOST_C10 virtual wire is VWS_HIGH, PECI will wake the CPU
//TODO: wake CPU every 8 seconds following Intel recommendation? //TODO: wake CPU every 8 seconds following Intel recommendation?
return (vw_get(&VW_PLTRST_N) == VWS_HIGH) && (vw_get(&VW_HOST_C10) != VWS_HIGH); return (vw_get(&VW_HOST_C10) != VWS_HIGH);
} }
// Returns true on success, false on error // Returns true on success, false on error