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[TG3]: 5784 / 5764 GPHY power down fix

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5784 and 5764 devices fail to link / pass traffic after one load /
unload cycle.  This happens because of a hardware bug in the new CPMU.
During normal operation, the MAC depends on the PHY clock being
available.  When the PHY is powered down, the clock the MAC depends on
is disabled.  The fix is to switch the MAC clock to an alternate source
before powering down the PHY, and to restore the MAC clock to the PHY
source upon device resume.

Signed-off-by: Matt Carlson <mcarlson@broadcom.com>
Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Matt Carlson 2007-11-12 21:08:03 -08:00 committed by David S. Miller
parent c88864df27
commit ce057f0195
2 changed files with 32 additions and 3 deletions
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26
drivers/net/tg3.c
View file

@ -1106,6 +1106,19 @@ static int tg3_phy_reset(struct tg3 *tp)
if (err)
return err;
if (tp->pci_chip_rev_id == CHIPREV_ID_5784_A0 ||
tp->pci_chip_rev_id == CHIPREV_ID_5761_A0) {
u32 val;
val = tr32(TG3_CPMU_LSPD_1000MB_CLK);
if ((val & CPMU_LSPD_1000MB_MACCLK_MASK) ==
CPMU_LSPD_1000MB_MACCLK_12_5) {
val &= ~CPMU_LSPD_1000MB_MACCLK_MASK;
udelay(40);
tw32_f(TG3_CPMU_LSPD_1000MB_CLK, val);
}
}
out:
if (tp->tg3_flags2 & TG3_FLG2_PHY_ADC_BUG) {
tg3_writephy(tp, MII_TG3_AUX_CTRL, 0x0c00);
@ -1297,6 +1310,8 @@ static void tg3_nvram_unlock(struct tg3 *);
static void tg3_power_down_phy(struct tg3 *tp)
{
u32 val;
if (tp->tg3_flags2 & TG3_FLG2_PHY_SERDES) {
if (GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5704) {
u32 sg_dig_ctrl = tr32(SG_DIG_CTRL);
@ -1311,8 +1326,6 @@ static void tg3_power_down_phy(struct tg3 *tp)
}
if (GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5906) {
u32 val;
tg3_bmcr_reset(tp);
val = tr32(GRC_MISC_CFG);
tw32_f(GRC_MISC_CFG, val | GRC_MISC_CFG_EPHY_IDDQ);
@ -1332,6 +1345,15 @@ static void tg3_power_down_phy(struct tg3 *tp)
(GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5780 &&
(tp->tg3_flags2 & TG3_FLG2_MII_SERDES)))
return;
if (tp->pci_chip_rev_id == CHIPREV_ID_5784_A0 ||
tp->pci_chip_rev_id == CHIPREV_ID_5761_A0) {
val = tr32(TG3_CPMU_LSPD_1000MB_CLK);
val &= ~CPMU_LSPD_1000MB_MACCLK_MASK;
val |= CPMU_LSPD_1000MB_MACCLK_12_5;
tw32_f(TG3_CPMU_LSPD_1000MB_CLK, val);
}
tg3_writephy(tp, MII_BMCR, BMCR_PDOWN);
}

9
drivers/net/tg3.h
View file

@ -109,6 +109,7 @@
#define CHIPREV_ID_5714_A2 0x9002
#define CHIPREV_ID_5906_A1 0xc001
#define CHIPREV_ID_5784_A0 0x5784000
#define CHIPREV_ID_5761_A0 0x5761000
#define GET_ASIC_REV(CHIP_REV_ID) ((CHIP_REV_ID) >> 12)
#define ASIC_REV_5700 0x07
#define ASIC_REV_5701 0x00
@ -856,7 +857,13 @@
#define CPMU_CTRL_LINK_IDLE_MODE 0x00000200
#define CPMU_CTRL_LINK_AWARE_MODE 0x00000400
#define CPMU_CTRL_LINK_SPEED_MODE 0x00004000
/* 0x3604 --> 0x365c unused */
/* 0x3604 --> 0x360c unused */
#define TG3_CPMU_LSPD_1000MB_CLK 0x0000360c
#define CPMU_LSPD_1000MB_MACCLK_62_5 0x00000000
#define CPMU_LSPD_1000MB_MACCLK_12_5 0x00110000
#define CPMU_LSPD_1000MB_MACCLK_MASK 0x001f0000
/* 0x3610 --> 0x365c unused */
#define TG3_CPMU_MUTEX_REQ 0x0000365c
#define CPMU_MUTEX_REQ_DRIVER 0x00001000