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e1000e: ignore uninitialized checksum word on tgp

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As described by Vitaly Lifshits:

> Starting from Tiger Lake, LAN NVM is locked for writes by SW, so the
> driver cannot perform checksum validation and correction. This means
> that all NVM images must leave the factory with correct checksum and
> checksum valid bit set.

Unfortunately some systems have left the factory with an uninitialized
value of 0xFFFF at register address 0x3F (checksum word location).
So on Tiger Lake platform we ignore the computed checksum when such
condition is encountered.

Signed-off-by: Jacek Kowalski <jacek@jacekk.info>
Tested-by: Vlad URSU <vlad@ursu.me>
Fixes: 4051f68318 ("e1000e: Do not take care about recovery NVM checksum")
Cc: stable@vger.kernel.org
Reviewed-by: Simon Horman <horms@kernel.org>
Reviewed-by: Vitaly Lifshits <vitaly.lifshits@intel.com>
Tested-by: Mor Bar-Gabay <morx.bar.gabay@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
This commit is contained in:
Jacek Kowalski 2025-06-30 10:35:00 +02:00 committed by Tony Nguyen
parent 536fd741c7
commit 61114910a5
2 changed files with 9 additions and 0 deletions
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3
drivers/net/ethernet/intel/e1000e/defines.h
View File

@ -638,6 +638,9 @@
/* For checksumming, the sum of all words in the NVM should equal 0xBABA. */
#define NVM_SUM 0xBABA
/* Uninitialized ("empty") checksum word value */
#define NVM_CHECKSUM_UNINITIALIZED 0xFFFF
/* PBA (printed board assembly) number words */
#define NVM_PBA_OFFSET_0 8
#define NVM_PBA_OFFSET_1 9

6
drivers/net/ethernet/intel/e1000e/nvm.c
View File

@ -558,6 +558,12 @@ s32 e1000e_validate_nvm_checksum_generic(struct e1000_hw *hw)
checksum += nvm_data;
}
if (hw->mac.type == e1000_pch_tgp &&
nvm_data == NVM_CHECKSUM_UNINITIALIZED) {
e_dbg("Uninitialized NVM Checksum on TGP platform - ignoring\n");
return 0;
}
if (checksum != (u16)NVM_SUM) {
e_dbg("NVM Checksum Invalid\n");
return -E1000_ERR_NVM;