static s32 igb_set_pcie_completion_timeout(struct e1000_hw *hw)
{
u32 gcr = rd32(E1000_GCR);
s32 ret_val = 0;
u16 pcie_devctl2;
if (gcr & E1000_GCR_CMPL_TMOUT_MASK)
goto out;
if (!(gcr & E1000_GCR_CAP_VER2)) {
gcr |= E1000_GCR_CMPL_TMOUT_10ms;
goto out;
}
ret_val = igb_read_pcie_cap_reg(hw, PCIE_DEVICE_CONTROL2,
&pcie_devctl2);
if (ret_val)
goto out;
pcie_devctl2 |= PCIE_DEVICE_CONTROL2_16ms;
ret_val = igb_write_pcie_cap_reg(hw, PCIE_DEVICE_CONTROL2,
&pcie_devctl2);
out:
gcr &= ~E1000_GCR_CMPL_TMOUT_RESEND;
wr32(E1000_GCR, gcr);
return ret_val;
}
/**
* igb_set_pcie_completion_timeout - set pci-e completion timeout
* @hw: pointer to the HW structure
*
* The defaults for 82575 and 82576 should be in the range of 50us to 50ms,
* however the hardware default for these parts is 500us to 1ms which is less
* than the 10ms recommended by the pci-e spec. To address this we need to
* increase the value to either 10ms to 200ms for capability version 1 config,
* or 16ms to 55ms for version 2.
**/
static s32 igb_set_pcie_completion_timeout(struct e1000_hw *hw)
{
u32 gcr = rd32(E1000_GCR);
s32 ret_val = 0;
u16 pcie_devctl2;
/* only take action if timeout value is defaulted to 0 */
if (gcr & E1000_GCR_CMPL_TMOUT_MASK)
goto out;
/*
* if capababilities version is type 1 we can write the
* timeout of 10ms to 200ms through the GCR register
*/
if (!(gcr & E1000_GCR_CAP_VER2)) {
gcr |= E1000_GCR_CMPL_TMOUT_10ms;
goto out;
}
/*
* for version 2 capabilities we need to write the config space
* directly in order to set the completion timeout value for
* 16ms to 55ms
*/
ret_val = igb_read_pcie_cap_reg(hw, PCIE_DEVICE_CONTROL2,
&pcie_devctl2);
if (ret_val)
goto out;
pcie_devctl2 |= PCIE_DEVICE_CONTROL2_16ms;
ret_val = igb_write_pcie_cap_reg(hw, PCIE_DEVICE_CONTROL2,
&pcie_devctl2);
out:
/* disable completion timeout resend */
gcr &= ~E1000_GCR_CMPL_TMOUT_RESEND;
wr32(E1000_GCR, gcr);
return ret_val;
}
