This is a note to let you know that I've just added the patch titled
i2c: i2c-mxs: Use DMA mode even for small transfers
to the 3.10-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-i2c-mxs-use-dma-mode-even-for-small-transfers.patch
and it can be found in the queue-3.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From d6e102f498cbcc8dd2e36721a01213f036397112 Mon Sep 17 00:00:00 2001
From: Fabio Estevam <[email protected]>
Date: Mon, 1 Jul 2013 18:14:21 -0300
Subject: i2c: i2c-mxs: Use DMA mode even for small transfers
From: Fabio Estevam <[email protected]>
commit d6e102f498cbcc8dd2e36721a01213f036397112 upstream.
Recently we have been seing some reports about PIO mode not working properly.
- http://www.spinics.net/lists/linux-i2c/msg11985.html
- http://marc.info/?l=linux-i2c&m=137235593101385&w=2
- https://lkml.org/lkml/2013/6/24/430
Let's use DMA mode even for small transfers.
Without this patch, i2c reads the incorrect sgtl5000 version on a mx28evk when
touchscreen is enabled:
[ 5.856270] sgtl5000 0-000a: Device with ID register 0 is not a sgtl5000
[ 9.877307] sgtl5000 0-000a: ASoC: failed to probe CODEC -19
[ 9.883528] mxs-sgtl5000 sound.12: ASoC: failed to instantiate card -19
[ 9.892955] mxs-sgtl5000 sound.12: snd_soc_register_card failed (-19)
[wsa: we have a proper solution for -next, so this non intrusive
solution is OK for now]
Signed-off-by: Fabio Estevam <[email protected]>
Acked-by: Shawn Guo <[email protected]>
Acked-by: Lucas Stach <[email protected]>
Acked-by: Marek Vasut <[email protected]>
Signed-off-by: Wolfram Sang <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/i2c/busses/i2c-mxs.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/i2c/busses/i2c-mxs.c
+++ b/drivers/i2c/busses/i2c-mxs.c
@@ -494,7 +494,7 @@ static int mxs_i2c_xfer_msg(struct i2c_a
* based on this empirical measurement and a lot of previous frobbing.
*/
i2c->cmd_err = 0;
- if (msg->len < 8) {
+ if (0) { /* disable PIO mode until a proper fix is made */
ret = mxs_i2c_pio_setup_xfer(adap, msg, flags);
if (ret)
mxs_i2c_reset(i2c);
Patches currently in stable-queue which might be from
[email protected] are
queue-3.10/i2c-i2c-mxs-use-dma-mode-even-for-small-transfers.patch
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