Messages in this thread | | | Date | Fri, 8 Jan 2016 22:36:11 -0600 | From | Andy Gross <> | Subject | Re: [V5, 3/6] i2c: qup: Transfer each i2c_msg in i2c_msgs without a stop bit |
| |
On Tue, Nov 17, 2015 at 05:15:24PM +0530, Sricharan R wrote: > The definition of i2c_msg says that > > "If this is the last message in a group, it is followed by a STOP. > Otherwise it is followed by the next @i2c_msg transaction segment, > beginning with a (repeated) START" > > So the expectation is that there is no 'STOP' bit inbetween individual > i2c_msg segments with repeated 'START'. The QUP i2c hardware has no way > to inform that there should not be a 'STOP' at the end of transaction. > The only way to implement this is to coalesce all the i2c_msg in i2c_msgs > in to one transaction and transfer them. Adding the support for the same. > > This is required for some clients like touchscreen which keeps > incrementing counts across individual transfers and 'STOP' bit inbetween > resets the counter, which is not required. > > This patch adds the support in non-dma mode. > > Signed-off-by: Sricharan R <sricharan@codeaurora.org>
Reviewed-by: Andy Gross <andy.gross@linaro.org>
| |