linux-kernel - Re: [PATCH 3/3] iio: magnetometer: mmc35240: fix SET/RESET sequence

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Date:	Tue, 14 Jul 2015 21:04:11 +0100
From:	Jonathan Cameron <jic23@...nel.org>
To:	Daniel Baluta <daniel.baluta@...el.com>
CC:	viorel.suman@...el.com, knaack.h@....de, lars@...afoo.de,
	pmeerw@...erw.net, linux-iio@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] iio: magnetometer: mmc35240: fix SET/RESET sequence



On 14 July 2015 15:56:54 BST, Daniel Baluta <daniel.baluta@...el.com> wrote:
>From: Viorel Suman <viorel.suman@...el.com>
>
>The RESET operation invoked in the last instance will align
>in the natural way all 3 axis and the chip top view.
What is the result of the bug?
Just trying to assess urgency of the patch!
>
>Signed-off-by: Viorel Suman <viorel.suman@...el.com>
>Signed-off-by: Daniel Baluta <daniel.baluta@...el.com>
>---
> drivers/iio/magnetometer/mmc35240.c | 7 ++++---
> 1 file changed, 4 insertions(+), 3 deletions(-)
>
>diff --git a/drivers/iio/magnetometer/mmc35240.c
>b/drivers/iio/magnetometer/mmc35240.c
>index f4d7495..a53efd2 100644
>--- a/drivers/iio/magnetometer/mmc35240.c
>+++ b/drivers/iio/magnetometer/mmc35240.c
>@@ -215,14 +215,15 @@ static int mmc35240_init(struct mmc35240_data
>*data)
> 
> 	/*
> 	 * make sure we restore sensor characteristics, by doing
>-	 * a RESET/SET sequence
>+	 * a SET/RESET sequence, the axis polarity being naturally
>+	 * aligned after RESET
> 	 */
>-	ret = mmc35240_hw_set(data, false);
>+	ret = mmc35240_hw_set(data, true);
> 	if (ret < 0)
> 		return ret;
> 	usleep_range(MMC53240_WAIT_SET_RESET, MMC53240_WAIT_SET_RESET + 1);
> 
>-	ret = mmc35240_hw_set(data, true);
>+	ret = mmc35240_hw_set(data, false);
> 	if (ret < 0)
> 		return ret;
> 

-- 
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