tree 7c3f0a64b056bcfb7b0877ead6383a0e1b66c729
parent 927556eb3a72306db1ba5ab8b9bb9914433302ba
author Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com> 1535967671 +0530
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1537390030 +0200

i2c: xiic: Make the start and the byte count write atomic

commit ae7304c3ea28a3ba47a7a8312c76c654ef24967e upstream.

Disable interrupts while configuring the transfer and enable them back.

We have below as the programming sequence
1. start and slave address
2. byte count and stop

In some customer platform there was a lot of interrupts between 1 and 2
and after slave address (around 7 clock cyles) if 2 is not executed
then the transaction is nacked.

To fix this case make the 2 writes atomic.

Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
[wsa: added a newline for better readability]
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Cc: stable@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>