hi Daniel,

Gentle pin for this patch.

Thanks
Best Regards
Fengquan


On Wed, 2021-04-21 at 18:27 +0800, Fengquan Chen wrote:

On Mon, 2021-04-19 at 10:44 +0200, Daniel Lezcano wrote:

quoted

On 09/04/2021 11:22, Fengquan Chen wrote:

quoted

mtk_syst_clkevt_shutdown is called after irq disabled in suspend flow,
clear any pending systimer irq when shutdown to avoid suspend aborted
due to timer irq pending

Also as for systimer in mediatek socs, there must be firstly enable
timer before clear systimer irq

Fixes: e3af677607d9("clocksource/drivers/timer-mediatek: Add support for system timer")
Signed-off-by: Fengquan Chen <redacted>

---
 drivers/clocksource/timer-mediatek.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/clocksource/timer-mediatek.c b/drivers/clocksource/timer-mediatek.c
index 9318edc..6461fd3 100644
--- a/drivers/clocksource/timer-mediatek.c
+++ b/drivers/clocksource/timer-mediatek.c

@@ -60,9 +60,9 @@
  * SYST_CON_EN: Clock enable. Shall be set to
  *   - Start timer countdown.
  *   - Allow timeout ticks being updated.
- *   - Allow changing interrupt functions.
+ *   - Allow changing interrupt status,like clear irq pending.
  *
- * SYST_CON_IRQ_EN: Set to allow interrupt.
+ * SYST_CON_IRQ_EN: Set to enable interrupt.
  *
  * SYST_CON_IRQ_CLR: Set to clear interrupt.
  */

@@ -75,6 +75,7 @@
 static void mtk_syst_ack_irq(struct timer_of *to)
 {
 	/* Clear and disable interrupt */
+	writel(SYST_CON_EN, SYST_CON_REG(to));
 	writel(SYST_CON_IRQ_CLR | SYST_CON_EN, SYST_CON_REG(to));
 }

IIRC, there is a hardware issue here. If it is the case, please describe
it and refer to an errata if any.

Thanks for review.
here is just a hw config flow limitation, not a bug.

quoted

Also Evan Benn commented your code and asked a couple of questions [1],
please answer before reposting a new version.

Comments ignored == patch ignored

Thanks. i have answered by mail before, but it didn't uploaded to the
list. has been uploaded ok now.

quoted

quoted

@@ -111,6 +112,9 @@ static int mtk_syst_clkevt_next_event(unsigned long ticks,
 
 static int mtk_syst_clkevt_shutdown(struct clock_event_device *clkevt)
 {
+	/* Clear any irq */
+	mtk_syst_ack_irq(to_timer_of(clkevt));
+
 	/* Disable timer */
 	writel(0, SYST_CON_REG(to_timer_of(clkevt)));

Please check out the patch sent by Evan Benn [2], if you agree, ack it.

Thanks

agree

quoted

Thanks

  -- Daniel

[1] https://patchwork.kernel.org/comment/24059277/
[2]
https://lore.kernel.org/linux-arm-kernel/20210412132200.v3.1.I1d9917047de06715da16e1620759f703fcfdcbcb@changeid/ (local)

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