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Nail the short cable problem the exact way National says it should be.

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This commit is contained in:
Poul-Henning Kamp 2005-01-06 23:49:26 +00:00
parent 0608b4a20c
commit bce3bc624c
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=139806
1 changed files with 14 additions and 19 deletions
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33
sys/pci/if_sis.c
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@ -1908,14 +1908,14 @@ sis_initl(struct sis_softc *sc)
}
/*
* Page 78 of the DP83815 data sheet (september 2002 version)
* Short Cable Receive Errors (MP21.E)
* also: Page 78 of the DP83815 data sheet (september 2002 version)
* recommends the following register settings "for optimum
* performance." for rev 15C. The driver from NS also sets
* the PHY_CR register for later versions.
*/
if (sc->sis_type == SIS_TYPE_83815) {
if (sc->sis_type == SIS_TYPE_83815 && sc->sis_srr <= NS_SRR_15D) {
CSR_WRITE_4(sc, NS_PHY_PAGE, 0x0001);
/* DC speed = 01 */
CSR_WRITE_4(sc, NS_PHY_CR, 0x189C);
if (sc->sis_srr == NS_SRR_15C) {
/* set val for c2 */
@ -2004,29 +2004,24 @@ sis_initl(struct sis_softc *sc)
SIS_CLRBIT(sc, SIS_RX_CFG, SIS_RXCFG_RX_TXPKTS);
}
if (sc->sis_type == SIS_TYPE_83815 && sc->sis_srr < NS_SRR_16A &&
if (sc->sis_type == SIS_TYPE_83815 &&
IFM_SUBTYPE(mii->mii_media_active) == IFM_100_TX) {
uint32_t reg;
/*
* Some DP83815s experience problems when used with short
* (< 30m/100ft) Ethernet cables in 100BaseTX mode. This
* sequence adjusts the DSP's signal attenuation to fix the
* problem.
* Short Cable Receive Errors (MP21.E)
*/
CSR_WRITE_4(sc, NS_PHY_PAGE, 0x0001);
reg = CSR_READ_4(sc, NS_PHY_DSPCFG);
/* Allow coefficient to be read */
CSR_WRITE_4(sc, NS_PHY_DSPCFG, (reg & 0xfff) | 0x1000);
DELAY(100);
reg = CSR_READ_4(sc, NS_PHY_TDATA);
if ((reg & 0x0080) == 0 ||
(reg > 0xd8 && reg <= 0xff)) {
device_printf(sc->sis_self, "Applying short cable fix (reg=%x)\n", reg);
reg = CSR_READ_4(sc, NS_PHY_DSPCFG) & 0xfff;
CSR_WRITE_4(sc, NS_PHY_DSPCFG, reg | 0x1000);
DELAY(100000);
reg = CSR_READ_4(sc, NS_PHY_TDATA) & 0xff;
if ((reg & 0x0080) == 0 || (reg > 0xd8 && reg <= 0xff)) {
device_printf(sc->sis_self,
"Applying short cable fix (reg=%x)\n", reg);
CSR_WRITE_4(sc, NS_PHY_TDATA, 0x00e8);
/* Adjust coefficient and prevent change */
SIS_SETBIT(sc, NS_PHY_DSPCFG, 0x20);
reg = CSR_READ_4(sc, NS_PHY_DSPCFG);
SIS_SETBIT(sc, NS_PHY_DSPCFG, reg | 0x20);
}
CSR_WRITE_4(sc, NS_PHY_PAGE, 0);
}