linux-kernel - Re: [PATCH 09/17] i2c: omap: ack IRQ in parts

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Date:	Thu, 14 Jun 2012 16:41:45 +0530
From:	"Shilimkar, Santosh" <santosh.shilimkar@...com>
To:	Felipe Balbi <balbi@...com>
Cc:	ben-linux@...ff.org, Tony Lindgren <tony@...mide.com>,
	w.sang@...gutronix.de,
	Linux OMAP Mailing List <linux-omap@...r.kernel.org>,
	linux-i2c@...r.kernel.org,
	Linux ARM Kernel Mailing List 
	<linux-arm-kernel@...ts.infradead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 09/17] i2c: omap: ack IRQ in parts

On Thu, Jun 14, 2012 at 3:50 PM, Felipe Balbi <balbi@...com> wrote:
> According to flow diagrams on OMAP TRMs,
> we should ACK the IRQ as they happen.
>
> Signed-off-by: Felipe Balbi <balbi@...com>
> ---
>  drivers/i2c/busses/i2c-omap.c |   29 +++++++++++++++++------------
>  1 file changed, 17 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c
> index f978b14..c00ba7d 100644
> --- a/drivers/i2c/busses/i2c-omap.c
> +++ b/drivers/i2c/busses/i2c-omap.c
> @@ -894,21 +894,20 @@ omap_i2c_isr(int this_irq, void *dev_id)
>                }
>
>  complete:
> -               /*
> -                * Ack the stat in one go, but [R/X]DR and [R/X]RDY should be
> -                * acked after the data operation is complete.
> -                * Ref: TRM SWPU114Q Figure 18-31
> -                */
> -               omap_i2c_write_reg(dev, OMAP_I2C_STAT_REG, stat &
> -                               ~(OMAP_I2C_STAT_RRDY | OMAP_I2C_STAT_RDR |
> -                               OMAP_I2C_STAT_XRDY | OMAP_I2C_STAT_XDR));
> -
> -               if (stat & OMAP_I2C_STAT_NACK)
> +               if (stat & OMAP_I2C_STAT_NACK) {
> +                       dev_err(dev->dev, "No Acknowledge\n");
>                        err |= OMAP_I2C_STAT_NACK;
> +                       omap_i2c_ack_stat(dev, OMAP_I2C_STAT_NACK);
> +                       omap_i2c_complete_cmd(dev, err);
> +                       return IRQ_HANDLED;
> +               }
>
Do you think making I2C IRQ ack + complete as one small static inline function
can save clean the code further. I see it has been used in multiple paths.
--
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