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Message-ID: <465D8DA0.3050307@linux-foundation.org>
Date: Wed, 30 May 2007 07:43:44 -0700
From: Stephen Hemminger <shemminger@...ux-foundation.org>
To: Jeff Garzik <jgarzik@...ox.com>
CC: netdev@...r.kernel.org
Subject: Re: [PATCH 6/7] sky2: enable clocks before probe
Jeff Garzik wrote:
> Stephen Hemminger wrote:
>> Some chips need to have internal clocks enabled (via PCI config)
>> before the PCI space is readable.
>>
>> Signed-off-by: Stephen Hemminger <shemminger@...ux-foundation.org>
>>
>> ---
>> drivers/net/sky2.c | 102
>> ++++++++++++++++++++++++++++++++++++++---------------
>> drivers/net/sky2.h | 19 +++++++++
>> 2 files changed, 92 insertions(+), 29 deletions(-)
>>
>> --- a/drivers/net/sky2.c 2007-05-24 15:22:14.000000000 -0700
>> +++ b/drivers/net/sky2.c 2007-05-24 15:22:33.000000000 -0700
>> @@ -2524,10 +2524,6 @@ static int __devinit sky2_init(struct sk
>> dev_warn(&hw->pdev->dev, "this driver not yet tested on this
>> chip type\n"
>> "Please report success or failure to
>> <netdev@...r.kernel.org>\n");
>>
>> - /* Make sure and enable all clocks */
>> - if (hw->chip_id == CHIP_ID_YUKON_EX || hw->chip_id ==
>> CHIP_ID_YUKON_EC_U)
>> - sky2_pci_write32(hw, PCI_DEV_REG3, 0);
>> -
>> hw->chip_rev = (sky2_read8(hw, B2_MAC_CFG) & CFG_CHIP_R_MSK) >> 4;
>>
>> /* This rev is really old, and requires untested workarounds */
>> @@ -3638,6 +3634,9 @@ static int __devinit sky2_probe(struct p
>> if (!hw->st_le)
>> goto err_out_iounmap;
>>
>> + /* On Yukon EC-U and EX need to force enabling all clocks */
>> + pci_write_config_dword(pdev, PCI_DEV_REG3, 0);
>> +
>> err = sky2_init(hw);
>> if (err)
>> goto err_out_iounmap;
>> @@ -3822,8 +3821,7 @@ static int sky2_resume(struct pci_dev *p
>> pci_enable_wake(pdev, PCI_D0, 0);
>>
>> /* Re-enable all clocks */
>> - if (hw->chip_id == CHIP_ID_YUKON_EX || hw->chip_id ==
>> CHIP_ID_YUKON_EC_U)
>> - sky2_pci_write32(hw, PCI_DEV_REG3, 0);
>> + pci_write_config_dword(pdev, PCI_DEV_REG3, 0);
>
>
> No explanation as to why the chip identity tests went away. And in
> one of your code comments, it seems to imply that the chip tests are
> still present.
>
Because you can't read chip idenity on 88e8071 when clocks are disabled
(catch-22), and clearing
registers on other chips is no problem.
-
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