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Message-Id: <200808042312.32249.rjw@sisk.pl>
Date: Mon, 4 Aug 2008 23:12:31 +0200
From: "Rafael J. Wysocki" <rjw@...k.pl>
To: Stephen Hemminger <shemminger@...tta.com>
Cc: Jeff Garzik <jgarzik@...ox.com>, netdev@...r.kernel.org
Subject: Re: [PATCH] sky2: fix PM related regressions
On Monday, 4 of August 2008, Stephen Hemminger wrote:
> Fix the problems reported for 2.6.27-rc1 caused by over aggressive
> power management. Turning clock off on PCI Express is problematic for WOL,
> and when doing multi-booting.
The patch fixes the problem for me, thanks.
> Signed-off-by: Stephen Hemminger <shemminger@...tta.com>
>
> --- a/drivers/net/sky2.c 2008-07-30 08:36:44.000000000 -0700
> +++ b/drivers/net/sky2.c 2008-08-02 21:00:58.000000000 -0700
> @@ -275,86 +275,6 @@ static void sky2_power_aux(struct sky2_h
> PC_VAUX_ON | PC_VCC_OFF));
> }
>
> -static void sky2_power_state(struct sky2_hw *hw, pci_power_t state)
> -{
> - u16 power_control = sky2_pci_read16(hw, hw->pm_cap + PCI_PM_CTRL);
> - int pex = pci_find_capability(hw->pdev, PCI_CAP_ID_EXP);
> - u32 reg;
> -
> - sky2_write8(hw, B2_TST_CTRL1, TST_CFG_WRITE_ON);
> -
> - switch (state) {
> - case PCI_D0:
> - break;
> -
> - case PCI_D1:
> - power_control |= 1;
> - break;
> -
> - case PCI_D2:
> - power_control |= 2;
> - break;
> -
> - case PCI_D3hot:
> - case PCI_D3cold:
> - power_control |= 3;
> - if (hw->flags & SKY2_HW_ADV_POWER_CTL) {
> - /* additional power saving measurements */
> - reg = sky2_pci_read32(hw, PCI_DEV_REG4);
> -
> - /* set gating core clock for LTSSM in L1 state */
> - reg |= P_PEX_LTSSM_STAT(P_PEX_LTSSM_L1_STAT) |
> - /* auto clock gated scheme controlled by CLKREQ */
> - P_ASPM_A1_MODE_SELECT |
> - /* enable Gate Root Core Clock */
> - P_CLK_GATE_ROOT_COR_ENA;
> -
> - if (pex && (hw->flags & SKY2_HW_CLK_POWER)) {
> - /* enable Clock Power Management (CLKREQ) */
> - u16 ctrl = sky2_pci_read16(hw, pex + PCI_EXP_DEVCTL);
> -
> - ctrl |= PCI_EXP_DEVCTL_AUX_PME;
> - sky2_pci_write16(hw, pex + PCI_EXP_DEVCTL, ctrl);
> - } else
> - /* force CLKREQ Enable in Our4 (A1b only) */
> - reg |= P_ASPM_FORCE_CLKREQ_ENA;
> -
> - /* set Mask Register for Release/Gate Clock */
> - sky2_pci_write32(hw, PCI_DEV_REG5,
> - P_REL_PCIE_EXIT_L1_ST | P_GAT_PCIE_ENTER_L1_ST |
> - P_REL_PCIE_RX_EX_IDLE | P_GAT_PCIE_RX_EL_IDLE |
> - P_REL_GPHY_LINK_UP | P_GAT_GPHY_LINK_DOWN);
> - } else
> - sky2_write8(hw, B28_Y2_ASF_STAT_CMD, Y2_ASF_CLK_HALT);
> -
> - /* put CPU into reset state */
> - sky2_write8(hw, B28_Y2_ASF_STAT_CMD, HCU_CCSR_ASF_RESET);
> - if (hw->chip_id == CHIP_ID_YUKON_SUPR && hw->chip_rev == CHIP_REV_YU_SU_A0)
> - /* put CPU into halt state */
> - sky2_write8(hw, B28_Y2_ASF_STAT_CMD, HCU_CCSR_ASF_HALTED);
> -
> - if (pex && !(hw->flags & SKY2_HW_RAM_BUFFER)) {
> - reg = sky2_pci_read32(hw, PCI_DEV_REG1);
> - /* force to PCIe L1 */
> - reg |= PCI_FORCE_PEX_L1;
> - sky2_pci_write32(hw, PCI_DEV_REG1, reg);
> - }
> - break;
> -
> - default:
> - dev_warn(&hw->pdev->dev, PFX "Invalid power state (%d) ",
> - state);
> - return;
> - }
> -
> - power_control |= PCI_PM_CTRL_PME_ENABLE;
> - /* Finally, set the new power state. */
> - sky2_pci_write32(hw, hw->pm_cap + PCI_PM_CTRL, power_control);
> -
> - sky2_write8(hw, B2_TST_CTRL1, TST_CFG_WRITE_OFF);
> - sky2_pci_read32(hw, B0_CTST);
> -}
> -
> static void sky2_gmac_reset(struct sky2_hw *hw, unsigned port)
> {
> u16 reg;
> @@ -709,6 +629,11 @@ static void sky2_phy_power_up(struct sky
> sky2_pci_write32(hw, PCI_DEV_REG1, reg1);
> sky2_write8(hw, B2_TST_CTRL1, TST_CFG_WRITE_OFF);
> sky2_pci_read32(hw, PCI_DEV_REG1);
> +
> + if (hw->chip_id == CHIP_ID_YUKON_FE)
> + gm_phy_write(hw, port, PHY_MARV_CTRL, PHY_CT_ANE);
> + else if (hw->flags & SKY2_HW_ADV_POWER_CTL)
> + sky2_write8(hw, SK_REG(port, GPHY_CTRL), GPC_RST_CLR);
> }
>
> static void sky2_phy_power_down(struct sky2_hw *hw, unsigned port)
> @@ -2855,10 +2780,6 @@ static int __devinit sky2_init(struct sk
> hw->flags = SKY2_HW_GIGABIT
> | SKY2_HW_NEWER_PHY
> | SKY2_HW_ADV_POWER_CTL;
> -
> - /* check for Rev. A1 dev 4200 */
> - if (sky2_read16(hw, Q_ADDR(Q_XA1, Q_WM)) == 0)
> - hw->flags |= SKY2_HW_CLK_POWER;
> break;
>
> case CHIP_ID_YUKON_EX:
> @@ -2914,12 +2835,6 @@ static int __devinit sky2_init(struct sk
> if (hw->pmd_type == 'L' || hw->pmd_type == 'S' || hw->pmd_type == 'P')
> hw->flags |= SKY2_HW_FIBRE_PHY;
>
> - hw->pm_cap = pci_find_capability(hw->pdev, PCI_CAP_ID_PM);
> - if (hw->pm_cap == 0) {
> - dev_err(&hw->pdev->dev, "cannot find PowerManagement capability\n");
> - return -EIO;
> - }
> -
> hw->ports = 1;
> t8 = sky2_read8(hw, B2_Y2_HW_RES);
> if ((t8 & CFG_DUAL_MAC_MSK) == CFG_DUAL_MAC_MSK) {
> @@ -4512,7 +4427,7 @@ static int sky2_suspend(struct pci_dev *
>
> pci_save_state(pdev);
> pci_enable_wake(pdev, pci_choose_state(pdev, state), wol);
> - sky2_power_state(hw, pci_choose_state(pdev, state));
> + pci_set_power_state(pdev, pci_choose_state(pdev, state));
>
> return 0;
> }
> @@ -4525,7 +4440,9 @@ static int sky2_resume(struct pci_dev *p
> if (!hw)
> return 0;
>
> - sky2_power_state(hw, PCI_D0);
> + err = pci_set_power_state(pdev, PCI_D0);
> + if (err)
> + goto out;
>
> err = pci_restore_state(pdev);
> if (err)
> @@ -4595,7 +4512,7 @@ static void sky2_shutdown(struct pci_dev
> pci_enable_wake(pdev, PCI_D3cold, wol);
>
> pci_disable_device(pdev);
> - sky2_power_state(hw, PCI_D3hot);
> + pci_set_power_state(pdev, PCI_D3hot);
> }
>
> static struct pci_driver sky2_driver = {
> --- a/drivers/net/sky2.h 2008-08-02 20:55:08.000000000 -0700
> +++ b/drivers/net/sky2.h 2008-08-02 21:01:04.000000000 -0700
> @@ -2072,9 +2072,7 @@ struct sky2_hw {
> #define SKY2_HW_NEW_LE 0x00000020 /* new LSOv2 format */
> #define SKY2_HW_AUTO_TX_SUM 0x00000040 /* new IP decode for Tx */
> #define SKY2_HW_ADV_POWER_CTL 0x00000080 /* additional PHY power regs */
> -#define SKY2_HW_CLK_POWER 0x00000100 /* clock power management */
>
> - int pm_cap;
> u8 chip_id;
> u8 chip_rev;
> u8 pmd_type;
>
>
--
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