This is a note to let you know that I've just added the patch titled
i2c: rk3x: Give the tuning value 0 during rk3x_i2c_v0_calc_timings
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
i2c-rk3x-give-the-tuning-value-0-during-rk3x_i2c_v0_calc_timings.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 399c168ab5ab5e12ed55b6c91d61c24eb84c9164 Mon Sep 17 00:00:00 2001
From: David Wu <david.wu@xxxxxxxxxxxxxx>
Date: Sat, 22 Oct 2016 16:43:42 +0800
Subject: i2c: rk3x: Give the tuning value 0 during rk3x_i2c_v0_calc_timings
From: David Wu <david.wu@xxxxxxxxxxxxxx>
commit 399c168ab5ab5e12ed55b6c91d61c24eb84c9164 upstream.
We found a bug that i2c transfer sometimes failed on 3066a board with
stabel-4.8, the con register would be updated by uninitialized tuning
value, it made the i2c transfer failed.
So give the tuning value to be zero during rk3x_i2c_v0_calc_timings.
Signed-off-by: David Wu <david.wu@xxxxxxxxxxxxxx>
Tested-by: Andy Yan <andy.yan@xxxxxxxxxxxxxx>
Reviewed-by: Douglas Anderson <dianders@xxxxxxxxxxxx>
Signed-off-by: Wolfram Sang <wsa@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/i2c/busses/i2c-rk3x.c | 2 ++
1 file changed, 2 insertions(+)
--- a/drivers/i2c/busses/i2c-rk3x.c
+++ b/drivers/i2c/busses/i2c-rk3x.c
@@ -600,6 +600,8 @@ static int rk3x_i2c_calc_divs(unsigned l
*div_low = *div_low - 1;
*div_high = *div_high - 1;
+ /* Give the tuning value 0, that would not update con register */
+ t_calc->tuning = 0;
/* Maximum divider supported by hw is 0xffff */
if (*div_low > 0xffff) {
*div_low = 0xffff;
Patches currently in stable-queue which might be from david.wu@xxxxxxxxxxxxxx are
queue-4.4/i2c-rk3x-give-the-tuning-value-0-during-rk3x_i2c_v0_calc_timings.patch
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