diff options
| author | Vitaly Lifshits <vitaly.lifshits@intel.com> | 2026-01-06 16:14:20 +0200 |
|---|---|---|
| committer | Sasha Levin <sashal@kernel.org> | 2026-03-12 07:09:44 -0400 |
| commit | d9e9e797070f4f8b948e2620374817af94d4c0e6 (patch) | |
| tree | bb850bfb4d0f7b583c391a28fda5d46137cf971f /drivers/net | |
| parent | dca4ea596a3b0a1b82bc1d9f3e4d88bd9ad9561f (diff) | |
e1000e: clear DPG_EN after reset to avoid autonomous power-gating
[ Upstream commit 0942fc6d324eb9c6b16187b2aa994c0823557f06 ]
Panther Lake systems introduced an autonomous power gating feature for
the integrated Gigabit Ethernet in shutdown state (S5) state. As part of
it, the reset value of DPG_EN bit was changed to 1. Clear this bit after
performing hardware reset to avoid errors such as Tx/Rx hangs, or packet
loss/corruption.
Fixes: 0c9183ce61bc ("e1000e: Add support for the next LOM generation")
Signed-off-by: Vitaly Lifshits <vitaly.lifshits@intel.com>
Reviewed-by: Aleksandr Loktionov <aleksandr.loktionov@intel.com>
Tested-by: Avigail Dahan <avigailx.dahan@intel.com>
Reviewed-by: Paul Menzel <pmenzel@molgen.mpg.de>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/net')
| -rw-r--r-- | drivers/net/ethernet/intel/e1000e/defines.h | 1 | ||||
| -rw-r--r-- | drivers/net/ethernet/intel/e1000e/ich8lan.c | 9 |
2 files changed, 10 insertions, 0 deletions
diff --git a/drivers/net/ethernet/intel/e1000e/defines.h b/drivers/net/ethernet/intel/e1000e/defines.h index ba331899d186..d4a1041e456d 100644 --- a/drivers/net/ethernet/intel/e1000e/defines.h +++ b/drivers/net/ethernet/intel/e1000e/defines.h @@ -33,6 +33,7 @@ /* Extended Device Control */ #define E1000_CTRL_EXT_LPCD 0x00000004 /* LCD Power Cycle Done */ +#define E1000_CTRL_EXT_DPG_EN 0x00000008 /* Dynamic Power Gating Enable */ #define E1000_CTRL_EXT_SDP3_DATA 0x00000080 /* Value of SW Definable Pin 3 */ #define E1000_CTRL_EXT_FORCE_SMBUS 0x00000800 /* Force SMBus mode */ #define E1000_CTRL_EXT_EE_RST 0x00002000 /* Reinitialize from EEPROM */ diff --git a/drivers/net/ethernet/intel/e1000e/ich8lan.c b/drivers/net/ethernet/intel/e1000e/ich8lan.c index 0ff8688ac3b8..2dceb5548a78 100644 --- a/drivers/net/ethernet/intel/e1000e/ich8lan.c +++ b/drivers/net/ethernet/intel/e1000e/ich8lan.c @@ -4932,6 +4932,15 @@ static s32 e1000_reset_hw_ich8lan(struct e1000_hw *hw) reg |= E1000_KABGTXD_BGSQLBIAS; ew32(KABGTXD, reg); + /* The hardware reset value of the DPG_EN bit is 1. + * Clear DPG_EN to prevent unexpected autonomous power gating. + */ + if (hw->mac.type >= e1000_pch_ptp) { + reg = er32(CTRL_EXT); + reg &= ~E1000_CTRL_EXT_DPG_EN; + ew32(CTRL_EXT, reg); + } + return 0; } |