linux-kernel - [PATCH] clocksource/drivers/timer-sun4i: Add CLOCK_EVT_FEAT

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Message-Id: <20230209040239.24710-1-frank.li@vivo.com>
Date:   Thu,  9 Feb 2023 12:02:39 +0800
From:   Yangtao Li <frank.li@...o.com>
To:     daniel.lezcano@...aro.org, tglx@...utronix.de, wens@...e.org,
        jernej.skrabec@...il.com, samuel@...lland.org
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-sunxi@...ts.linux.dev, Yangtao Li <frank.li@...o.com>
Subject: [PATCH] clocksource/drivers/timer-sun4i: Add CLOCK_EVT_FEAT_DYNIRQ

Add CLOCK_EVT_FEAT_DYNIRQ to allow the IRQ could be runtime set affinity
to the cores that needs wake up, otherwise saying core0 has to send
IPI to wakeup core1. With CLOCK_EVT_FEAT_DYNIRQ set, when broadcast
timer could wake up the cores, IPI is not needed.

After enabling this feature, especially the scene where cpuidle is
enabled can benefit.

Signed-off-by: Yangtao Li <frank.li@...o.com>
---
 drivers/clocksource/timer-sun4i.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/clocksource/timer-sun4i.c b/drivers/clocksource/timer-sun4i.c
index e5a70aa1deb4..7bdcc60ad43c 100644
--- a/drivers/clocksource/timer-sun4i.c
+++ b/drivers/clocksource/timer-sun4i.c
@@ -144,7 +144,8 @@ static struct timer_of to = {
 	.clkevt = {
 		.name = "sun4i_tick",
 		.rating = 350,
-		.features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
+		.features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT |
+				CLOCK_EVT_FEAT_DYNIRQ,
 		.set_state_shutdown = sun4i_clkevt_shutdown,
 		.set_state_periodic = sun4i_clkevt_set_periodic,
 		.set_state_oneshot = sun4i_clkevt_set_oneshot,
-- 
2.25.1