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uart: detect 256-byte FIFOs

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Submitted by:	Zakary Nafziger <worldofzak@gmail.com>
Sponsored by:	The FreeBSD Foundation
This commit is contained in:
Ed Maste 2017-10-10 20:08:30 +00:00
parent 67d9aa4422
commit 6e71b3c3ed
1 changed files with 4 additions and 1 deletions
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5
sys/dev/uart/uart_dev_ns8250.c
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@ -873,7 +873,7 @@ ns8250_bus_probe(struct uart_softc *sc)
count = 0;
goto describe;
}
} while ((lsr & LSR_OE) == 0 && count < 130);
} while ((lsr & LSR_OE) == 0 && count < 260);
count--;
uart_setreg(bas, REG_MCR, mcr);
@ -894,6 +894,9 @@ ns8250_bus_probe(struct uart_softc *sc)
} else if (count >= 112 && count <= 128) {
sc->sc_rxfifosz = 128;
device_set_desc(sc->sc_dev, "16950 or compatible");
} else if (count >= 224 && count <= 256) {
sc->sc_rxfifosz = 256;
device_set_desc(sc->sc_dev, "16x50 with 256 byte FIFO");
} else {
sc->sc_rxfifosz = 16;
device_set_desc(sc->sc_dev,