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    Subject[PATCH 5.13 063/300] clocksource/drivers/sh_cmt: Fix wrong setting if dont request IRQ for clock source channel
    Date
    From: Phong Hoang <phong.hoang.wz@renesas.com>

    [ 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: bfa76bb12f23 ("clocksource: sh_cmt: Request IRQ for clock event device only")
    Fixes: 37e7742c55ba ("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>
    ---
    drivers/clocksource/sh_cmt.c | 30 ++++++++++++++++++------------
    1 file changed, 18 insertions(+), 12 deletions(-)

    diff --git a/drivers/clocksource/sh_cmt.c b/drivers/clocksource/sh_cmt.c
    index d7ed99f0001f..dd0956ad969c 100644
    --- a/drivers/clocksource/sh_cmt.c
    +++ b/drivers/clocksource/sh_cmt.c
    @@ -579,7 +579,8 @@ 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);
    @@ -621,20 +622,25 @@ 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);
    +
    + if (unlikely(has_wrapped))
    + raw += ch->match_value + 1;
    + raw_spin_unlock_irqrestore(&ch->lock, flags);
    +
    + return value + raw;
    + }

    - return value + raw;
    + return sh_cmt_get_counter(ch, &has_wrapped);
    }

    static int sh_cmt_clocksource_enable(struct clocksource *cs)
    @@ -697,7 +703,7 @@ 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",
    --
    2.30.2


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