target/linux/layerscape/patches-5.4/701-net-0404-LF-457-ocelot-tsn-clean-preempt-interrupt-status.patch

   1 From 5d246e343440ee4915109dac66543d02d71ca900 Mon Sep 17 00:00:00 2001
   2 From: Xiaoliang Yang <xiaoliang.yang_1@nxp.com>
   3 Date: Tue, 11 Feb 2020 15:33:46 +0800
   4 Subject: [PATCH] LF-457: ocelot: tsn: clean preempt interrupt status
   5
   6 The INTB interrupt is used both for 1588 interrupt and preemption status
   7 change interrupt on each port. So clean preempt status interrupt in IRQ
   8 handle function. Without handling it, driver may get interrupt storm.
   9
  10 Signed-off-by: Xiaoliang Yang <xiaoliang.yang_1@nxp.com>
  11 Reviewed-by: Po Liu <Po.Liu@nxp.com>
  12 ---
  13  drivers/net/dsa/ocelot/felix.c         |  5 +----
  14  drivers/net/ethernet/mscc/ocelot_tsn.c | 14 ++++++++++++++
  15  include/soc/mscc/ocelot.h              |  1 +
  16  3 files changed, 16 insertions(+), 4 deletions(-)
  17
  18 --- a/drivers/net/dsa/ocelot/felix.c
  19 +++ b/drivers/net/dsa/ocelot/felix.c
  20 @@ -688,12 +688,9 @@ static irqreturn_t felix_irq_handler(int
  21
  22         /* The INTB interrupt is used for both PTP TX timestamp interrupt
  23          * and preemption status change interrupt on each port.
  24 -        *
  25 -        * - Get txtstamp if have
  26 -        * - TODO: handle preemption. Without handling it, driver may get
  27 -        *   interrupt storm.
  28          */
  29
  30 +       ocelot_preempt_irq_clean(ocelot);
  31         ocelot_get_txtstamp(ocelot);
  32
  33         return IRQ_HANDLED;
  34 --- a/drivers/net/ethernet/mscc/ocelot_tsn.c
  35 +++ b/drivers/net/ethernet/mscc/ocelot_tsn.c
  36 @@ -1570,3 +1570,17 @@ int ocelot_dscp_set(struct ocelot *ocelo
  37
  38         return 0;
  39  }
  40 +
  41 +void ocelot_preempt_irq_clean(struct ocelot *ocelot)
  42 +{
  43 +       struct ocelot_port *ocelot_port;
  44 +       int port;
  45 +       u32 val;
  46 +
  47 +       val = DEV_GMII_MM_STATISTICS_MM_STATUS_PRMPT_ACTIVE_STICKY;
  48 +       for (port = 0; port < ocelot->num_phys_ports; port++) {
  49 +               ocelot_port = ocelot->ports[port];
  50 +               ocelot_port_rmwl(ocelot_port, val, val,
  51 +                                DEV_GMII_MM_STATISTICS_MM_STATUS);
  52 +       }
  53 +}
  54 --- a/include/soc/mscc/ocelot.h
  55 +++ b/include/soc/mscc/ocelot.h
  56 @@ -592,4 +592,5 @@ int ocelot_rtag_parse_enable(struct ocel
  57  int ocelot_dscp_set(struct ocelot *ocelot, int port,
  58                     bool enable, const u8 dscp_ix,
  59                     struct tsn_qos_switch_dscp_conf *c);
  60 +void ocelot_preempt_irq_clean(struct ocelot *ocelot);
  61  #endif