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alc: force maximum payload size to 128 bytes for AR816X/AR817x

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Otherwise, we'll trigger a DMA write error and render the device
unusable.

Obtained from:	OpenBSD (via Haiku, waddlesplash)
MFC after:	3 days
This commit is contained in:
Kyle Evans 2022-06-06 20:52:55 -05:00
parent 81c857dd7e
commit 8cdb6b2dd7
1 changed files with 3 additions and 2 deletions
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5
sys/dev/alc/if_alc.c
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@ -1493,10 +1493,11 @@ alc_attach(device_t dev)
sc->alc_dma_wr_burst = 3;
/*
* Force maximum payload size to 128 bytes for
* E2200/E2400/E2500.
* E2200/E2400/E2500/AR8162/AR8171/AR8172.
* Otherwise it triggers DMA write error.
*/
if ((sc->alc_flags & ALC_FLAG_E2X00) != 0)
if ((sc->alc_flags &
(ALC_FLAG_E2X00 | ALC_FLAG_AR816X_FAMILY)) != 0)
sc->alc_dma_wr_burst = 0;
alc_init_pcie(sc);
}