git: 0979b0430c2d - main - e1000: Disable autonomous PCH power gating after reset
Kevin Bowling <[email protected]>
| Newsgroups | gmane.os.freebsd.devel.cvs.src,gmane.os.freebsd.current.scm |
|---|---|
| Message-ID | <[email protected]> |
The branch main has been updated by kbowling: URL: https://cgit.FreeBSD.org/src/commit/?id=0979b0430c2d728e595841ecba30b63972794fe9 commit 0979b0430c2d728e595841ecba30b63972794fe9 Author: Kevin Bowling <[email protected]> AuthorDate: 2026-08-11 15:23:51 +0000 Commit: Kevin Bowling <[email protected]> CommitDate: 2026-08-11 15:30:27 +0000 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 --- sys/dev/e1000/e1000_defines.h | 1 + sys/dev/e1000/e1000_ich8lan.c | 8 ++++++++ 2 files changed, 9 insertions(+) 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; }