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From: Troy Kisky <troy.kisky@boundarydevices.com>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCH 3/3] mxc_i2c: remove setting speed at each start
Date: Fri, 04 May 2012 15:52:29 -0700	[thread overview]
Message-ID: <4FA45DAD.8090700@boundarydevices.com> (raw)
In-Reply-To: <1335324807-16177-3-git-send-email-troy.kisky@boundarydevices.com>

On 4/24/2012 8:33 PM, Troy Kisky wrote:
> Other then being very weird, this code was also wrong.
> For example, say I set speed to 100K. I'll read back the speed
> as 85937. But the speed is really 85937.5, so we I reset
> the speed to 85937, I'll get 73660.7. After a couple of transactions
> my speed is now exactly 68750 so it will remain there.
>
> Signed-off-by: Troy Kisky<troy.kisky@boundarydevices.com>
> ---
>   drivers/i2c/mxc_i2c.c |    6 ------
>   1 files changed, 0 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/i2c/mxc_i2c.c b/drivers/i2c/mxc_i2c.c
> index 416ffee..fc68062 100644
> --- a/drivers/i2c/mxc_i2c.c
> +++ b/drivers/i2c/mxc_i2c.c
> @@ -231,12 +231,6 @@ int i2c_imx_start(void)
>   	struct mxc_i2c_regs *i2c_regs = (struct mxc_i2c_regs *)I2C_BASE;
>   	unsigned int temp = 0;
>   	int result;
> -	int speed = i2c_get_bus_speed();
> -	u8 clk_idx = i2c_imx_get_clk(speed);
> -	u8 idx = i2c_clk_div[clk_idx][1];
> -
> -	/* Store divider value */
> -	writeb(idx,&i2c_regs->ifdr);
>
>   	/* Enable I2C controller */
>   	writeb(0,&i2c_regs->i2sr);
Marek would you care to ack/nak this? It is deleting code that you added.

Thanks
Troy

  reply	other threads:[~2012-05-04 22:52 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-04-25  3:33 [U-Boot] [PATCH 1/3] mxc_i2c: specify i2c base address in config file Troy Kisky
2012-04-25  3:33 ` [U-Boot] [PATCH 2/3] mx6qsabrelite: add i2c support Troy Kisky
2012-05-06 15:24   ` Stefano Babic
2012-04-25  3:33 ` [U-Boot] [PATCH 3/3] mxc_i2c: remove setting speed at each start Troy Kisky
2012-05-04 22:52   ` Troy Kisky [this message]
2012-05-05 13:05     ` Marek Vasut
2012-05-05 13:08     ` Marek Vasut
2012-05-05 20:22       ` Troy Kisky
2012-05-05 21:36         ` Marek Vasut
2012-05-05 22:26           ` Troy Kisky
2012-05-05 23:06             ` Marek Vasut
2012-05-06 15:27               ` Stefano Babic
2012-07-11  6:27                 ` Dirk Behme
2012-07-13 10:38                   ` Marek Vasut
2012-07-13 11:56                     ` Wolfgang Denk
2012-07-13 12:11                       ` Marek Vasut
2012-07-16  9:39                     ` Stefano Babic
2012-05-06 15:27 ` [U-Boot] [PATCH 1/3] mxc_i2c: specify i2c base address in config file Stefano Babic
2012-07-11  6:25   ` Dirk Behme
2012-07-11  8:35     ` Heiko Schocher

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