On 04/11/2017 08:05 AM, Heiner Kallweit wrote:
> We don't need the memory barriers here and an interrupt handler should
> be as fast as possible. Therefore switch to readl_relaxed.
>
> Signed-off-by: Heiner Kallweit <hkallweit1@xxxxxxxxx>
> ---
> drivers/media/rc/meson-ir.c | 7 ++++---
> 1 file changed, 4 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/media/rc/meson-ir.c b/drivers/media/rc/meson-ir.c
> index d56ef27e..246da2db 100644
> --- a/drivers/media/rc/meson-ir.c
> +++ b/drivers/media/rc/meson-ir.c
> @@ -83,16 +83,17 @@ static void meson_ir_set_mask(struct meson_ir *ir, unsigned int reg,
> static irqreturn_t meson_ir_irq(int irqno, void *dev_id)
> {
> struct meson_ir *ir = dev_id;
> - u32 duration;
> + u32 duration, status;
> DEFINE_IR_RAW_EVENT(rawir);
>
> spin_lock(&ir->lock);
>
> - duration = readl(ir->reg + IR_DEC_REG1);
> + duration = readl_relaxed(ir->reg + IR_DEC_REG1);
> duration = FIELD_GET(REG1_TIME_IV_MASK, duration);
> rawir.duration = US_TO_NS(duration * MESON_TRATE);
>
> - rawir.pulse = !!(readl(ir->reg + IR_DEC_STATUS) & STATUS_IR_DEC_IN);
> + status = readl_relaxed(ir->reg + IR_DEC_STATUS);
> + rawir.pulse = !!(status & STATUS_IR_DEC_IN);
>
> ir_raw_event_store_with_filter(ir->rc, &rawir);
> ir_raw_event_handle(ir->rc);
>
Reviewed-by: Neil Armstrong <narmstrong@xxxxxxxxxxxx>
