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Commit 8f56e4b9 authored by Don Skidmore's avatar Don Skidmore Committed by Jeff Kirsher
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ixgbe: add I2C clock stretching 



This patch adds support for I2C clock stretching which is required per
SFF-8636.  Customers with passive DA cables implement clock stretching
would fail without this patch.

Signed-off-by: default avatarDon Skidmore <donald.c.skidmore@intel.com>
Tested-by: default avatarPhil Schmitt <phillip.j.schmitt@intel.com>
Signed-off-by: default avatarJeff Kirsher <jeffrey.t.kirsher@intel.com>
parent be0c0068

drivers/net/ethernet/intel/ixgbe/ixgbe_phy.c

+14 −6
Original line number Diff line number Diff line
@@ -1582,13 +1582,21 @@ static s32 ixgbe_clock_out_i2c_bit(struct ixgbe_hw *hw, bool data) 
 **/

static void ixgbe_raise_i2c_clk(struct ixgbe_hw *hw, u32 *i2cctl)

{

	*i2cctl |= IXGBE_I2C_CLK_OUT;

	u32 i = 0;

	u32 timeout = IXGBE_I2C_CLOCK_STRETCHING_TIMEOUT;

	u32 i2cctl_r = 0;



	for (i = 0; i < timeout; i++) {

		*i2cctl |= IXGBE_I2C_CLK_OUT;

		IXGBE_WRITE_REG(hw, IXGBE_I2CCTL, *i2cctl);

		IXGBE_WRITE_FLUSH(hw);



		/* SCL rise time (1000ns) */

		udelay(IXGBE_I2C_T_RISE);



		i2cctl_r = IXGBE_READ_REG(hw, IXGBE_I2CCTL);

		if (i2cctl_r & IXGBE_I2C_CLK_IN)

			break;

	}

}



/**

drivers/net/ethernet/intel/ixgbe/ixgbe_type.h

+1 −0
Original line number Diff line number Diff line
@@ -110,6 +110,7 @@ 
#define IXGBE_I2C_CLK_OUT   0x00000002

#define IXGBE_I2C_DATA_IN   0x00000004

#define IXGBE_I2C_DATA_OUT  0x00000008

#define IXGBE_I2C_CLOCK_STRETCHING_TIMEOUT	500



/* Interrupt Registers */

#define IXGBE_EICR      0x00800