xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

ARM: OMAP4: retrigger localtimers after re-enabling gic

Browse Source 
'Workaround for ROM bug because of CA9 r2pX gic control'
register change disables the gic distributor while the secondary
cpu is being booted.  If a localtimer interrupt on the primary cpu
occurs when the distributor is turned off, the interrupt is lost,
and the localtimer never fires again.

Make the primary cpu wait for the secondary cpu to reenable the
gic distributor (with interrupts off for safety), and then
check if the pending bit is set in the localtimer but not the
gic.  If so, ack it in the localtimer, and reset the timer with
the minimum timeout to trigger a new timer interrupt.

Signed-off-by: Colin Cross <ccross@android.com>
[s-jan@ti.com: adapted to k3.4 + validated functionality]
Signed-off-by: Sebastien Jan <s-jan@ti.com>
[t-kristo@ti.com: dropped generic ARM kernel exports from the code, rebased
 to mainline]
Signed-off-by: Tero Kristo <t-kristo@ti.com>
Signed-off-by: Kevin Hilman <khilman@ti.com>
This commit is contained in:
Colin Cross
2012-10-18 12:20:08 +03:00
committed by Kevin Hilman
parent ff999b8a09
commit cd8ce15903
3 changed files with 48 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

13
arch/arm/mach-omap2/omap-smp.c
View File

@@ -134,11 +134,22 @@ static int __cpuinit omap4_boot_secondary(unsigned int cpu, struct task_struct *
* 2) CPU1 must re-enable the GIC distributor on
* it's wakeup path.
*/
if (IS_PM44XX_ERRATUM(PM_OMAP4_ROM_SMP_BOOT_ERRATUM_GICD))
if (IS_PM44XX_ERRATUM(PM_OMAP4_ROM_SMP_BOOT_ERRATUM_GICD)) {
local_irq_disable();
gic_dist_disable();
}
clkdm_wakeup(cpu1_clkdm);
clkdm_allow_idle(cpu1_clkdm);
if (IS_PM44XX_ERRATUM(PM_OMAP4_ROM_SMP_BOOT_ERRATUM_GICD)) {
while (gic_dist_disabled()) {
udelay(1);
cpu_relax();
}
gic_timer_retrigger();
local_irq_enable();
}
} else {
dsb_sev();
booted = true;