diff options
| author | Kevin Bowling <kbowling@FreeBSD.org> | 2026-08-11 15:23:51 +0000 |
|---|---|---|
| committer | Kevin Bowling <kbowling@FreeBSD.org> | 2026-08-11 15:30:27 +0000 |
| commit | 0979b0430c2d728e595841ecba30b63972794fe9 (patch) | |
| tree | 93e0bd04011d47b1579bd60253827e3c1aaec0bb | |
| parent | 698c3b0ce1e788415173639366ae89ae7b7903ca (diff) | |
e1000: Disable autonomous PCH power gating after reset
Panther Point changed the reset value of CTRL_EXT.DPG_EN to enable
autonomous power gating. Clear it after hardware reset on Panther Point
and Nova Point controllers to prevent unexpected Tx/Rx hangs, packet
loss, or corruption.
MFC after: 1 week
| -rw-r--r-- | sys/dev/e1000/e1000_defines.h | 1 | ||||
| -rw-r--r-- | sys/dev/e1000/e1000_ich8lan.c | 8 |
2 files changed, 9 insertions, 0 deletions
diff --git a/sys/dev/e1000/e1000_defines.h b/sys/dev/e1000/e1000_defines.h index f1b1008764a1..9b8aca173856 100644 --- a/sys/dev/e1000/e1000_defines.h +++ b/sys/dev/e1000/e1000_defines.h @@ -66,6 +66,7 @@ /* Extended Device Control */ #define E1000_CTRL_EXT_LPCD 0x00000004 /* LCD Power Cycle Done */ +#define E1000_CTRL_EXT_DPG_EN 0x00000008 /* Dynamic Power Gating */ #define E1000_CTRL_EXT_SDP4_DATA 0x00000010 /* SW Definable Pin 4 data */ #define E1000_CTRL_EXT_SDP6_DATA 0x00000040 /* SW Definable Pin 6 data */ #define E1000_CTRL_EXT_SDP3_DATA 0x00000080 /* SW Definable Pin 3 data */ diff --git a/sys/dev/e1000/e1000_ich8lan.c b/sys/dev/e1000/e1000_ich8lan.c index 32cd5a4532fc..d454b2ede3dc 100644 --- a/sys/dev/e1000/e1000_ich8lan.c +++ b/sys/dev/e1000/e1000_ich8lan.c @@ -5101,6 +5101,14 @@ static s32 e1000_reset_hw_ich8lan(struct e1000_hw *hw) reg |= E1000_KABGTXD_BGSQLBIAS; E1000_WRITE_REG(hw, E1000_KABGTXD, reg); + /* Prevent autonomous power gating after the hardware reset. */ + if (hw->mac.type >= e1000_pch_ptp && + hw->mac.type < e1000_82575) { + reg = E1000_READ_REG(hw, E1000_CTRL_EXT); + reg &= ~E1000_CTRL_EXT_DPG_EN; + E1000_WRITE_REG(hw, E1000_CTRL_EXT, reg); + } + return E1000_SUCCESS; } |