AuxXxilium/linux_dsm_epyc7002
1
0
Fork 0
mirror of https://github.com/AuxXxilium/linux_dsm_epyc7002.git synced 2024-11-23 21:40:49 +07:00
Code Issues Actions Packages Projects Releases Wiki Activity

clocksource/drivers/sh_cmt: Fix wrong setting if don't request IRQ for clock source channel

Browse Source 
[ Upstream commit be83c3b6e7b8ff22f72827a613bf6f3aa5afadbb ]

If CMT instance has at least two channels, one channel will be used
as a clock source and another one used as a clock event device.
In that case, IRQ is not requested for clock source channel so
sh_cmt_clock_event_program_verify() might work incorrectly.
Besides, when a channel is only used for clock source, don't need to
re-set the next match_value since it should be maximum timeout as
it still is.

On the other hand, due to no IRQ, total_cycles is not counted up
when reaches compare match time (timer counter resets to zero),
so sh_cmt_clocksource_read() returns unexpected value.
Therefore, use 64-bit clocksoure's mask for 32-bit or 16-bit variants
will also lead to wrong delta calculation. Hence, this mask should
correspond to timer counter width, and above function just returns
the raw value of timer counter register.

Fixes: bfa76bb12f ("clocksource: sh_cmt: Request IRQ for clock event device only")
Fixes: 37e7742c55 ("clocksource/drivers/sh_cmt: Fix clocksource width for 32-bit machines")
Signed-off-by: Phong Hoang <phong.hoang.wz@renesas.com>
Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20210422123443.73334-1-niklas.soderlund+renesas@ragnatech.se
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Phong Hoang 2021-04-22 14:34:43 +02:00 committed by AuxXxilium
parent 7e433ef602
commit f128e80b02
1 changed files with 18 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

30
drivers/clocksource/sh_cmt.c
View File

@ -572,7 +572,8 @@ static int sh_cmt_start(struct sh_cmt_channel *ch, unsigned long flag)
ch->flags |= flag;
/* setup timeout if no clockevent */
if ((flag == FLAG_CLOCKSOURCE) && (!(ch->flags & FLAG_CLOCKEVENT)))
if (ch->cmt->num_channels == 1 &&
flag == FLAG_CLOCKSOURCE && (!(ch->flags & FLAG_CLOCKEVENT)))
__sh_cmt_set_next(ch, ch->max_match_value);
out:
raw_spin_unlock_irqrestore(&ch->lock, flags);
@ -608,20 +609,25 @@ static struct sh_cmt_channel *cs_to_sh_cmt(struct clocksource *cs)
static u64 sh_cmt_clocksource_read(struct clocksource *cs)
{
struct sh_cmt_channel *ch = cs_to_sh_cmt(cs);
unsigned long flags;
u32 has_wrapped;
u64 value;
u32 raw;
raw_spin_lock_irqsave(&ch->lock, flags);
value = ch->total_cycles;
raw = sh_cmt_get_counter(ch, &has_wrapped);
if (ch->cmt->num_channels == 1) {
unsigned long flags;
u64 value;
u32 raw;
if (unlikely(has_wrapped))
raw += ch->match_value + 1;
raw_spin_unlock_irqrestore(&ch->lock, flags);
raw_spin_lock_irqsave(&ch->lock, flags);
value = ch->total_cycles;
raw = sh_cmt_get_counter(ch, &has_wrapped);
return value + raw;
if (unlikely(has_wrapped))
raw += ch->match_value + 1;
raw_spin_unlock_irqrestore(&ch->lock, flags);
return value + raw;
}
return sh_cmt_get_counter(ch, &has_wrapped);
}
static int sh_cmt_clocksource_enable(struct clocksource *cs)
@ -684,7 +690,7 @@ static int sh_cmt_register_clocksource(struct sh_cmt_channel *ch,
cs->disable = sh_cmt_clocksource_disable;
cs->suspend = sh_cmt_clocksource_suspend;
cs->resume = sh_cmt_clocksource_resume;
cs->mask = CLOCKSOURCE_MASK(sizeof(u64) * 8);
cs->mask = CLOCKSOURCE_MASK(ch->cmt->info->width);
cs->flags = CLOCK_SOURCE_IS_CONTINUOUS;
dev_info(&ch->cmt->pdev->dev, "ch%u: used as clock source\n",