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| author | Lars-Peter Clausen <lars@metafoo.de> | 2015-11-16 14:42:03 +0100 |
|---|---|---|
| committer | Wolfram Sang <wsa@the-dreams.de> | 2015-11-20 16:04:59 +0100 |
| commit | 9656eeebf3f1dd05376c4c923797369746d9a618 (patch) | |
| tree | 5b54c322b854060ed62d5edd0573e9952d0ccadc /drivers/i2c/busses/i2c-eg20t.c | |
| parent | 8bb6fd585d419d906fb3c228db47fbc4e4272a00 (diff) | |
| download | linux-9656eeebf3f1dd05376c4c923797369746d9a618.tar.gz | |
i2c: Revert "i2c: xiic: Do not reset controller before every transfer"
Commit d701667bb331 ("i2c: xiic: Do not reset controller before every
transfer") removed the reinitialization of the controller before the start
of each transfer. Apparently this change is not safe to make and the commit
results in random I2C bus failures.
An easy way to trigger the issue is to run i2cdetect.
Without the patch applied:
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- UU UU -- UU 3c -- -- UU
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --
With the patch applied every other or so invocation:
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f
10: 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f
20: 20 21 22 23 24 25 26 27 28 29 2a 2b 2c 2d 2e 2f
30: -- -- -- -- -- -- -- -- UU UU -- UU 3c -- -- UU
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --
So revert the commit for now.
Fixes: d701667bb331 ("i2c: xiic: Do not reset controller before every transfer")
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Acked-by: Shubhrajyoti Datta <shubhraj@xilinx.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Diffstat (limited to 'drivers/i2c/busses/i2c-eg20t.c')
0 files changed, 0 insertions, 0 deletions