Thanks for the tip. I attempted to see if the register was implemented
on the i.mx6, and it doesn't appear to be. I'll reach out to my FAE. I
found the datasheet and the register definitely isn't documented
there.
I was thinking of a patch that would keep track of state, and
synthesize the I2C_SLAVE_STOP on the next interrupt if it was a new
transaction. Does this seem too hacky to you? What are your thoughts?
Thanks,
Kevin
Thanks,
Kevin
On Wed, Dec 9, 2020 at 6:16 PM Biwen Li <biwen...@nxp.com> wrote:
>
> Hi Kevin,
>
>
>
> After enabling idle interrupts, the i2c register will generate an idle
> interrupts(whatever read or write) when i2c bus enter idle status. Then get
> I2C_SLAVE_STOP event.
>
> But don’t have the IBIC register(Maybe it’s a hidden register) in imx. You
> can query about the AE of imx about this.
>
> static void i2c_imx_enable_bus_idle(struct imx_i2c_struct *i2c_imx)
>
> {
>
> if (is_vf610_i2c(i2c_imx)) {
>
> unsigned int temp;
>
>
>
> temp = imx_i2c_read_reg(i2c_imx, IMX_I2C_IBIC);
>
> temp |= IBIC_BIIE;
>
> imx_i2c_write_reg(temp, i2c_imx, IMX_I2C_IBIC);
>
> }
>
> }
>
>
>
> Best Regards,
>
> Biwen Li
>
> From: Kevin Herbert <k...@platinasystems.com>
> Sent: 2020年12月10日 1:18
> To: Wolfram Sang <w...@the-dreams.de>; Kevin Herbert
> <k...@platinasystems.com>; Biwen Li (OSS) <biwen...@oss.nxp.com>; Leo Li
> <leoyang...@nxp.com>; li...@rempel-privat.de; ker...@pengutronix.de;
> shawn...@kernel.org; s.ha...@pengutronix.de; feste...@gmail.com; Aisheng Dong
> <aisheng.d...@nxp.com>; Clark Wang <xiaoning.w...@nxp.com>;
> o.rem...@pengutronix.de; linux-...@vger.kernel.org;
> linux-kernel@vger.kernel.org; Jiafei Pan <jiafei....@nxp.com>; Xiaobo Xie
> <xiaobo....@nxp.com>; linux-arm-ker...@lists.infradead.org; Biwen Li
> <biwen...@nxp.com>
> Subject: [EXT] Re: [v10] i2c: imx: support slave mode for imx I2C driver
>
>
>
> Caution: EXT Email
>
> Even on an operation like writing a byte, I get I2C_SLAVE_WRITE_REQUESTED
> followed by I2C_SLAVE_WRITE_RECEIVED, but no I2C_SLAVE_STOP. If I do a I2C
> write of multiple bytes, I get I2c_SLAVE_WRITE_REQUESTED followed by multiple
> I2C_SLAVE_WRITE_RECEIVED.
>
>
>
> Kevin
>
>
>
> On Wed, Dec 9, 2020 at 9:10 AM Wolfram Sang <w...@the-dreams.de> wrote:
>
> On Wed, Dec 09, 2020 at 09:03:50AM -0800, Kevin Herbert wrote:
> > What is the protocol for the I2C_SLAVE_STOP event? I am working on my own
> > backend, and I've only tried it with this i.mx driver, and I do not receive
> > I2C_SLAVE_STOP at the end of every I2C transaction. It was my expectation
> > I'd receive this event at the end of every frame. In my testing, I've never
> > received this event at all.
> >
> > Where are the I2C registers on the i.mx documented? My board is an i.mx6sx.
>
> Hmm, from a glimpse, it looks the STOP event is only sent after a write
> and not after a read? Does this match your findings?
