[src/trunk]: src/sys/arch/arm/nvidia wait for PWRGATE_TOGGLE.START to clear b...

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

details:   https://anonhg.NetBSD.org/src/rev/e01c5aa5cb7b
branches:  trunk
changeset: 338452:e01c5aa5cb7b
user:      jmcneill <jmcneill%NetBSD.org@localhost>
date:      Mon May 25 10:40:23 2015 +0000

description:
wait for PWRGATE_TOGGLE.START to clear before submitting a new request

diffstat:

 sys/arch/arm/nvidia/tegra_pmc.c |  18 +++++++++++++++---
 1 files changed, 15 insertions(+), 3 deletions(-)

diffs (47 lines):

diff -r 51c1c66d3ce5 -r e01c5aa5cb7b sys/arch/arm/nvidia/tegra_pmc.c
--- a/sys/arch/arm/nvidia/tegra_pmc.c   Mon May 25 09:01:06 2015 +0000
+++ b/sys/arch/arm/nvidia/tegra_pmc.c   Mon May 25 10:40:23 2015 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: tegra_pmc.c,v 1.5 2015/05/18 21:03:36 jmcneill Exp $ */
+/* $NetBSD: tegra_pmc.c,v 1.6 2015/05/25 10:40:23 jmcneill 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_pmc.c,v 1.5 2015/05/18 21:03:36 jmcneill Exp $");
+__KERNEL_RCSID(0, "$NetBSD: tegra_pmc.c,v 1.6 2015/05/25 10:40:23 jmcneill Exp $");
 
 #include <sys/param.h>
 #include <sys/bus.h>
@@ -117,8 +117,9 @@
 {
        bus_space_tag_t bst;
        bus_space_handle_t bsh;
-       uint32_t status;
+       uint32_t status, toggle;
        bool state;
+       int retry = 10000;
 
        tegra_pmc_get_bs(&bst, &bsh);
 
@@ -127,6 +128,17 @@
        if (state == enable)
                return;
 
+       while (--retry > 0) {
+               toggle = bus_space_read_4(bst, bsh, PMC_PWRGATE_TOGGLE_0_REG);
+               if ((toggle & PMC_PWRGATE_TOGGLE_0_START) == 0)
+                       break;
+               delay(1);
+       }
+       if (retry == 0) {
+               printf("ERROR: Couldn't enable PMC partition %#x\n", partid);
+               return;
+       }
+
        bus_space_write_4(bst, bsh, PMC_PWRGATE_TOGGLE_0_REG,
            __SHIFTIN(partid, PMC_PWRGATE_TOGGLE_0_PARTID) |
            PMC_PWRGATE_TOGGLE_0_START);