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| Started by | Wolfram Sang <wsa@the-dreams.de> |
|---|---|
| First post | 2015-09-11 21:00 +0200 |
| Last post | 2015-09-14 07:10 +0200 |
| Articles | 2 — 2 participants |
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Re: [PATCH-v5 RESEND 2/5] i2c: pxa: enable/disable i2c module across msg xfer Wolfram Sang <wsa@the-dreams.de> - 2015-09-11 21:00 +0200
Re: [PATCH-v5 RESEND 2/5] i2c: pxa: enable/disable i2c module across msg xfer Vaibhav Hiremath <vaibhav.hiremath@linaro.org> - 2015-09-14 07:10 +0200
| From | Wolfram Sang <wsa@the-dreams.de> |
|---|---|
| Date | 2015-09-11 21:00 +0200 |
| Subject | Re: [PATCH-v5 RESEND 2/5] i2c: pxa: enable/disable i2c module across msg xfer |
| Message-ID | <q7BId-1Oi-3@gated-at.bofh.it> |
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On Mon, Aug 24, 2015 at 11:29:35AM +0530, Vaibhav Hiremath wrote: > From: Yi Zhang <yizhang@marvell.com> > > Enable i2c module/unit before transmission and disable when it > finishes. > > why? > It's because the i2c bus may be disturbed if the slave device, > typically a touch, powers on. I am not convinced, "may disturb" is too weak for me. It would need a way more detailed description of the problem which makes clear that this mechanism is the only way to go forward. Can't you use Runtime PM for that?
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| From | Vaibhav Hiremath <vaibhav.hiremath@linaro.org> |
|---|---|
| Date | 2015-09-14 07:10 +0200 |
| Message-ID | <q8ubD-4LN-1@gated-at.bofh.it> |
| In reply to | #1223041 |
On Saturday 12 September 2015 12:23 AM, Wolfram Sang wrote: > On Mon, Aug 24, 2015 at 11:29:35AM +0530, Vaibhav Hiremath wrote: >> From: Yi Zhang <yizhang@marvell.com> >> >> Enable i2c module/unit before transmission and disable when it >> finishes. >> >> why? >> It's because the i2c bus may be disturbed if the slave device, >> typically a touch, powers on. > > I am not convinced, "may disturb" is too weak for me. It would need a > way more detailed description of the problem which makes clear that > this mechanism is the only way to go forward. > Hmm, Ok. Not sure what else I can bring up here. > Can't you use Runtime PM for that? > I haven't tried it though, I can give a try and check. Thanks, Vaibhav -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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