[PATCH] i2c: imx-lpi2c: add debug message when i2c peripheral clk doesn't work

[PATCH] i2c: imx-lpi2c: add debug message when i2c peripheral clk doesn't work

[carlos.song]

From: Gao Pan <pandy.gao@nxp.com>

Add debug message when i2c peripheral clk rate is 0, then
directly return -EINVAL.

Fixes: a55fa9d0e42e ("i2c: imx-lpi2c: add low power i2c bus driver")
Signed-off-by: Gao Pan <pandy.gao@nxp.com>
Signed-off-by: Carlos Song <carlos.song@nxp.com>
---
 drivers/i2c/busses/i2c-imx-lpi2c.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/i2c/busses/i2c-imx-lpi2c.c b/drivers/i2c/busses/i2c-imx-lpi2c.c
index 11240bf8e8e2..62111fe9f207 100644
--- a/drivers/i2c/busses/i2c-imx-lpi2c.c
+++ b/drivers/i2c/busses/i2c-imx-lpi2c.c
@@ -209,6 +209,11 @@ static int lpi2c_imx_config(struct lpi2c_imx_struct *lpi2c_imx)
 	lpi2c_imx_set_mode(lpi2c_imx);
 
 	clk_rate = clk_get_rate(lpi2c_imx->clks[0].clk);
+	if (!clk_rate) {
+		dev_dbg(&lpi2c_imx->adapter.dev, "clk_per rate is 0\n");
+		return -EINVAL;
+	}
+
 	if (lpi2c_imx->mode == HS || lpi2c_imx->mode == ULTRA_FAST)
 		filt = 0;
 	else
-- 
2.34.1

Re: [PATCH] i2c: imx-lpi2c: add debug message when i2c peripheral clk doesn't work

[Andi Shyti]

Hi,

On Mon, May 29, 2023 at 03:23:16PM +0800, carlos.song@nxp.com wrote:
> From: Gao Pan <pandy.gao@nxp.com>
> 
> Add debug message when i2c peripheral clk rate is 0, then
> directly return -EINVAL.
> 
> Fixes: a55fa9d0e42e ("i2c: imx-lpi2c: add low power i2c bus driver")
> Signed-off-by: Gao Pan <pandy.gao@nxp.com>
> Signed-off-by: Carlos Song <carlos.song@nxp.com>
> ---
>  drivers/i2c/busses/i2c-imx-lpi2c.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/i2c/busses/i2c-imx-lpi2c.c b/drivers/i2c/busses/i2c-imx-lpi2c.c
> index 11240bf8e8e2..62111fe9f207 100644
> --- a/drivers/i2c/busses/i2c-imx-lpi2c.c
> +++ b/drivers/i2c/busses/i2c-imx-lpi2c.c
> @@ -209,6 +209,11 @@ static int lpi2c_imx_config(struct lpi2c_imx_struct *lpi2c_imx)
>  	lpi2c_imx_set_mode(lpi2c_imx);
>  
>  	clk_rate = clk_get_rate(lpi2c_imx->clks[0].clk);
> +	if (!clk_rate) {
> +		dev_dbg(&lpi2c_imx->adapter.dev, "clk_per rate is 0\n");
> +		return -EINVAL;
> +	}

should this rather be a dev_err?

And, BTW, did you actually hit this?

Andi

> +
>  	if (lpi2c_imx->mode == HS || lpi2c_imx->mode == ULTRA_FAST)
>  		filt = 0;
>  	else
> -- 
> 2.34.1
> 

RE: [EXT] Re: [PATCH] i2c: imx-lpi2c: add debug message when i2c peripheral clk doesn't work

[Carlos Song]

Hi, Andi

> -----Original Message-----
> From: Andi Shyti <andi.shyti@kernel.org>
> Sent: Wednesday, June 14, 2023 7:40 AM
> To: Carlos Song <carlos.song@nxp.com>
> Cc: Aisheng Dong <aisheng.dong@nxp.com>; shawnguo@kernel.org;
> s.hauer@pengutronix.de; kernel@pengutronix.de; festevam@gmail.com; Clark
> Wang <xiaoning.wang@nxp.com>; Bough Chen <haibo.chen@nxp.com>;
> dl-linux-imx <linux-imx@nxp.com>; linux-i2c@vger.kernel.org;
> linux-arm-kernel@lists.infradead.org; linux-kernel@vger.kernel.org
> Subject: [EXT] Re: [PATCH] i2c: imx-lpi2c: add debug message when i2c
> peripheral clk doesn't work
> 
> Caution: This is an external email. Please take care when clicking links or
> opening attachments. When in doubt, report the message using the 'Report this
> email' button
> 
> 
> Hi,
> 
> On Mon, May 29, 2023 at 03:23:16PM +0800, carlos.song@nxp.com wrote:
> > From: Gao Pan <pandy.gao@nxp.com>
> >
> > Add debug message when i2c peripheral clk rate is 0, then directly
> > return -EINVAL.
> >
> > Fixes: a55fa9d0e42e ("i2c: imx-lpi2c: add low power i2c bus driver")
> > Signed-off-by: Gao Pan <pandy.gao@nxp.com>
> > Signed-off-by: Carlos Song <carlos.song@nxp.com>
> > ---
> >  drivers/i2c/busses/i2c-imx-lpi2c.c | 5 +++++
> >  1 file changed, 5 insertions(+)
> >
> > diff --git a/drivers/i2c/busses/i2c-imx-lpi2c.c
> > b/drivers/i2c/busses/i2c-imx-lpi2c.c
> > index 11240bf8e8e2..62111fe9f207 100644
> > --- a/drivers/i2c/busses/i2c-imx-lpi2c.c
> > +++ b/drivers/i2c/busses/i2c-imx-lpi2c.c
> > @@ -209,6 +209,11 @@ static int lpi2c_imx_config(struct lpi2c_imx_struct
> *lpi2c_imx)
> >       lpi2c_imx_set_mode(lpi2c_imx);
> >
> >       clk_rate = clk_get_rate(lpi2c_imx->clks[0].clk);
> > +     if (!clk_rate) {
> > +             dev_dbg(&lpi2c_imx->adapter.dev, "clk_per rate is 0\n");
> > +             return -EINVAL;
> > +     }
> 
> should this rather be a dev_err?
> 
Carlos: Yes, I will fix it.
> And, BTW, did you actually hit this?
> 
Carlos: No, not frequently. But I think it will be safer maybe.
> Andi
> 
> > +
> >       if (lpi2c_imx->mode == HS || lpi2c_imx->mode == ULTRA_FAST)
> >               filt = 0;
> >       else
> > --
> > 2.34.1
> >