在 2014/10/21 5:31, Kevin Hilman 写道:
"jinkun.hong" <jinkun.hong@xxxxxxxxxxxxxx> writes:
From: "jinkun.hong" <jinkun.hong@xxxxxxxxxxxxxx>
Add power domain drivers based on generic power domain for Rockchip platform,
and support RK3288.
Signed-off-by: Jack Dai <jack.dai@xxxxxxxxxxxxxx>
Signed-off-by: jinkun.hong <jinkun.hong@xxxxxxxxxxxxxx>
[...]
+static int rockchip_pmu_set_idle_request(struct rockchip_domain *pd,
+ bool idle)
+{
+ u32 idle_mask = BIT(pd->idle_shift);
+ u32 idle_target = idle << (pd->idle_shift);
+ u32 ack_mask = BIT(pd->ack_shift);
+ u32 ack_target = idle << (pd->ack_shift);
+ unsigned int mask = BIT(pd->req_shift);
+ unsigned int val;
+ unsigned long flags;
+
+ spin_lock_irqsave(&pd->idle_lock, flags);
+ val = (idle) ? mask : 0;
+ regmap_update_bits(pd->regmap_pmu, REQ_OFFSET, mask, val);
+ dsb();
A summary of the locking and barriers here (or in changelog) would be
helpful for reviewers to verify you're protecting what you need to
protect.
+ do {
+ regmap_read(pd->regmap_pmu, ACK_OFFSET, &val);
+ } while ((val & ack_mask) != ack_target);
+
+ do {
+ regmap_read(pd->regmap_pmu, IDLE_OFFSET, &val);
+ } while ((val & idle_mask) != idle_target);
+
+ spin_unlock_irqrestore(&pd->idle_lock, flags);
These IRQ-disabled while loops look like opportunities to lockup the
system. Maybe add a timeout or a maximum number of tries?
Ok,I will add a timeout in new version.
+ return 0;
+}
Kevin
Thank you for your review.
--
To unsubscribe from this list: send the line "unsubscribe linux-doc" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
