[Intel-wired-lan] [PATCH v2] igc: Add PHY power management control

[Vinicius Costa Gomes <vinicius.gomes@intel.com>]

Sasha Neftin <sasha.neftin@intel.com> writes:

> PHY power management control should provide a reliable and accurate
> indication of PHY reset completion and decrease the delay time
> after a PHY reset
>
> v1 -> v2: add hw_dbg print for a timeout
>
> Signed-off-by: Sasha Neftin <sasha.neftin@intel.com>
> ---
>  drivers/net/ethernet/intel/igc/igc_defines.h |  1 +
>  drivers/net/ethernet/intel/igc/igc_phy.c     | 12 ++++++++++++
>  drivers/net/ethernet/intel/igc/igc_regs.h    |  1 +
>  3 files changed, 14 insertions(+)
>
> diff --git a/drivers/net/ethernet/intel/igc/igc_defines.h b/drivers/net/ethernet/intel/igc/igc_defines.h
> index 2121fc34e300..71a4b0281c03 100644
> --- a/drivers/net/ethernet/intel/igc/igc_defines.h
> +++ b/drivers/net/ethernet/intel/igc/igc_defines.h
> @@ -460,6 +460,7 @@
>  /* PHY Status Register */
>  #define MII_SR_LINK_STATUS	0x0004 /* Link Status 1 = link */
>  #define MII_SR_AUTONEG_COMPLETE	0x0020 /* Auto Neg Complete */
> +#define IGC_PHY_RST_COMP	0x0100 /* Internal PHY reset completion */
>  
>  /* PHY 1000 MII Register/Bit Definitions */
>  /* PHY Registers defined by IEEE */
> diff --git a/drivers/net/ethernet/intel/igc/igc_phy.c b/drivers/net/ethernet/intel/igc/igc_phy.c
> index f4b05af0dd2f..a5483368690a 100644
> --- a/drivers/net/ethernet/intel/igc/igc_phy.c
> +++ b/drivers/net/ethernet/intel/igc/igc_phy.c
> @@ -173,6 +173,7 @@ s32 igc_check_downshift(struct igc_hw *hw)
>  s32 igc_phy_hw_reset(struct igc_hw *hw)
>  {
>  	struct igc_phy_info *phy = &hw->phy;
> +	u32 phpm = 0, timeout = 10000;
>  	s32  ret_val;
>  	u32 ctrl;
>  
> @@ -186,6 +187,8 @@ s32 igc_phy_hw_reset(struct igc_hw *hw)
>  	if (ret_val)
>  		goto out;
>  
> +	phpm = rd32(IGC_I225_PHPM);
> +
>  	ctrl = rd32(IGC_CTRL);
>  	wr32(IGC_CTRL, ctrl | IGC_CTRL_PHY_RST);
>  	wrfl();
> @@ -195,6 +198,15 @@ s32 igc_phy_hw_reset(struct igc_hw *hw)
>  	wr32(IGC_CTRL, ctrl);
>  	wrfl();
>  
> +	do {
> +		phpm = rd32(IGC_I225_PHPM);
> +		timeout--;
> +		udelay(1);
> +	} while (!(phpm & IGC_PHY_RST_COMP) && timeout);
> +
> +	if (!timeout)
> +		hw_dbg("Timeoui is expired after a phy reset\n");

nitpick: Timeoui -> Timeout