From: Samuel Holland <samuel@sholland.org>
To: Daniel Lezcano <daniel.lezcano@linaro.org>,
Thomas Gleixner <tglx@linutronix.de>
Cc: Samuel Holland <samuel@sholland.org>,
Albert Ou <aou@eecs.berkeley.edu>,
Atish Patra <atishp@atishpatra.org>,
Dmitriy Cherkasov <dmitriy@oss-tech.org>,
Palmer Dabbelt <palmer@dabbelt.com>,
Paul Walmsley <paul.walmsley@sifive.com>,
linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org
Subject: [PATCH] clocksource/drivers/riscv: Events are stopped during CPU suspend
Date: Sun, 8 May 2022 20:21:21 -0500 [thread overview]
Message-ID: <20220509012121.40031-1-samuel@sholland.org> (raw)
Some implementations of the SBI time extension depend on hart-local
state (for example, CSRs) that are lost or hardware that is powered
down when a CPU is suspended. To be safe, the clockevents driver
cannot assume that timer IRQs will be received during CPU suspend.
Fixes: 62b019436814 ("clocksource: new RISC-V SBI timer driver")
Signed-off-by: Samuel Holland <samuel@sholland.org>
---
drivers/clocksource/timer-riscv.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/clocksource/timer-riscv.c b/drivers/clocksource/timer-riscv.c
index 1767f8bf2013..593d5a957b69 100644
--- a/drivers/clocksource/timer-riscv.c
+++ b/drivers/clocksource/timer-riscv.c
@@ -34,7 +34,7 @@ static int riscv_clock_next_event(unsigned long delta,
static unsigned int riscv_clock_event_irq;
static DEFINE_PER_CPU(struct clock_event_device, riscv_clock_event) = {
.name = "riscv_timer_clockevent",
- .features = CLOCK_EVT_FEAT_ONESHOT,
+ .features = CLOCK_EVT_FEAT_ONESHOT | CLOCK_EVT_FEAT_C3STOP,
.rating = 100,
.set_next_event = riscv_clock_next_event,
};
--
2.35.1
_______________________________________________
linux-riscv mailing list
linux-riscv@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-riscv
next reply other threads:[~2022-05-09 1:21 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-09 1:21 Samuel Holland [this message]
2022-05-09 2:56 ` [PATCH] clocksource/drivers/riscv: Events are stopped during CPU suspend Jessica Clarke
2022-05-09 3:51 ` Anup Patel
2022-05-09 11:44 ` Daniel Lezcano
2022-09-29 21:50 ` Conor Dooley
2022-10-09 23:45 ` Palmer Dabbelt
2022-10-24 5:01 ` Samuel Holland
2022-10-24 7:04 ` Conor Dooley
2022-10-24 8:04 ` Anup Patel
2022-10-27 23:07 ` Palmer Dabbelt
2022-10-27 23:41 ` Samuel Holland
2022-10-28 0:30 ` Conor Dooley
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20220509012121.40031-1-samuel@sholland.org \
--to=samuel@sholland.org \
--cc=aou@eecs.berkeley.edu \
--cc=atishp@atishpatra.org \
--cc=daniel.lezcano@linaro.org \
--cc=dmitriy@oss-tech.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-riscv@lists.infradead.org \
--cc=palmer@dabbelt.com \
--cc=paul.walmsley@sifive.com \
--cc=tglx@linutronix.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox