[src/trunk]: src/sys/arch/arm/nvidia Do not clear the PCIe interrupt until we...

[jakllsch <jakllsch%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/72a5facd9145
branches:  trunk
changeset: 811819:72a5facd9145
user:      jakllsch <jakllsch%NetBSD.org@localhost>
date:      Tue Nov 17 00:08:33 2015 +0000

description:
Do not clear the PCIe interrupt until we've allowed its cause to become
deasserted.  This halves the PCIe interrupt rate.

diffstat:

 sys/arch/arm/nvidia/tegra_pcie.c |  16 +++++++++++-----
 1 files changed, 11 insertions(+), 5 deletions(-)

diffs (49 lines):

diff -r 953730371553 -r 72a5facd9145 sys/arch/arm/nvidia/tegra_pcie.c
--- a/sys/arch/arm/nvidia/tegra_pcie.c  Mon Nov 16 23:27:07 2015 +0000
+++ b/sys/arch/arm/nvidia/tegra_pcie.c  Tue Nov 17 00:08:33 2015 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: tegra_pcie.c,v 1.10 2015/11/14 03:44:52 jakllsch Exp $ */
+/* $NetBSD: tegra_pcie.c,v 1.11 2015/11/17 00:08:33 jakllsch Exp $ */
 
 /*-
  * Copyright (c) 2015 Jared D. McNeill <jmcneill%invisible.ca@localhost>
@@ -29,7 +29,7 @@
 #include "locators.h"
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: tegra_pcie.c,v 1.10 2015/11/14 03:44:52 jakllsch Exp $");
+__KERNEL_RCSID(0, "$NetBSD: tegra_pcie.c,v 1.11 2015/11/17 00:08:33 jakllsch Exp $");
 
 #include <sys/param.h>
 #include <sys/bus.h>
@@ -237,21 +237,27 @@
 tegra_pcie_intr(void *priv)
 {
        struct tegra_pcie_softc *sc = priv;
+       int rv;
 
        const uint32_t code = bus_space_read_4(sc->sc_bst, sc->sc_bsh_afi,
            AFI_INTR_CODE_REG);
        const uint32_t sig = bus_space_read_4(sc->sc_bst, sc->sc_bsh_afi,
            AFI_INTR_SIGNATURE_REG);
-       bus_space_write_4(sc->sc_bst, sc->sc_bsh_afi, AFI_INTR_CODE_REG, 0);
 
        switch (__SHIFTOUT(code, AFI_INTR_CODE_INT_CODE)) {
        case AFI_INTR_CODE_SM_MSG:
-               return tegra_pcie_legacy_intr(sc);
+               rv = tegra_pcie_legacy_intr(sc);
+               break;
        default:
                device_printf(sc->sc_dev, "intr: code %#x sig %#x\n",
                    code, sig);
-               return 1;
+               rv = 1;
+               break;
        }
+
+       bus_space_write_4(sc->sc_bst, sc->sc_bsh_afi, AFI_INTR_CODE_REG, 0);
+
+       return rv;
 }
 
 static void