[PATCH] pmdomain: bcm: bcm2835-power: Raise ASB poll timeout to 100us

[Maíra Canal]

Commit 18605b1b936b ("pmdomain: bcm: bcm2835-power: Increase ASB control
timeout") raised the ASB handshake polling budget from 1us to 5us.
Surveying the pmdomain subsystem, 5us is still one of the smallest polling
budgets by a wide margin. Comparable handshakes in other drivers use:

  - 100us : starfive jh71xx-pmu, apple pmgr-pwrstate
  - 1ms   : renesas rcar-sysc, rmobile-sysc (power-on)
  - 10ms  : renesas rcar-gen4-sysc, sunxi sun55i-pck600
  - 1s    : mediatek mtk-pm-domains, mtk-scpsys

Raise the BCM2835 timeout to 100us, matching analogous drivers. 100us is
still negligible relative to a power-domain transition and gives the V3D
master ASB substantially more headroom to drain under heavy workloads,
assuring us that the timeout is enough for any scenario.

Signed-off-by: Maíra Canal <mcanal at igalia.com>
---
 drivers/pmdomain/bcm/bcm2835-power.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pmdomain/bcm/bcm2835-power.c b/drivers/pmdomain/bcm/bcm2835-power.c
index b76d74e3849b..d507bb675e29 100644
--- a/drivers/pmdomain/bcm/bcm2835-power.c
+++ b/drivers/pmdomain/bcm/bcm2835-power.c
@@ -175,7 +175,7 @@ static int bcm2835_asb_control(struct bcm2835_power *power, u32 reg, bool enable
 	writel(PM_PASSWORD | val, base + reg);
 
 	if (readl_poll_timeout_atomic(base + reg, val,
-				      !!(val & ASB_ACK) != enable, 0, 5))
+				      !!(val & ASB_ACK) != enable, 0, 100))
 		return -ETIMEDOUT;
 
 	return 0;
-- 
2.54.0