i40e: delay after VF reset

Delay a minimum of 10ms after VF reset, to allow the hardware's internal
FIFOs to flush.

Change-ID: I8a02ddb28c9f0d7303a1eb21d0b2443e5b4c1cda
Signed-off-by: Mitch Williams <mitch.a.williams@intel.com>
Tested-by: Jim Young <james.m.young@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

1 files changed, 6 insertions, 6 deletions

diff --git a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
index 044019b9d406..4e4232a58843 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
@@ -668,13 +668,13 @@ void i40e_reset_vf(struct i40e_vf *vf, bool flr)
         /* poll VPGEN_VFRSTAT reg to make sure
          * that reset is complete
          */
-        for (i = 0; i < 100; i++) {
-                /* vf reset requires driver to first reset the
-                 * vf and then poll the status register to make sure
-                 * that the requested op was completed
-                 * successfully
+        for (i = 0; i < 10; i++) {
+                /* VF reset requires driver to first reset the VF and then
+                 * poll the status register to make sure that the reset
+                 * completed successfully. Due to internal HW FIFO flushes,
+                 * we must wait 10ms before the register will be valid.
                  */
-                usleep_range(10, 20);
+                usleep_range(10000, 20000);
                 reg = rd32(hw, I40E_VPGEN_VFRSTAT(vf->vf_id));
                 if (reg & I40E_VPGEN_VFRSTAT_VFRD_MASK) {
                         rsd = true;