* [PATCH 0/3] i2c: imx: Fix handling of arbitration loss
@ 2020-09-17 12:13 Christian Eggers
0 siblings, 0 replies; 3+ messages in thread
From: Christian Eggers @ 2020-09-17 12:13 UTC (permalink / raw)
To: Oleksij Rempel, Shawn Guo, Sascha Hauer, Fabio Estevam
Cc: linux-arm-kernel, linux-kernel, NXP Linux Team,
Pengutronix Kernel Team, linux-i2c
On my (noisy) system, I2C arbitration losses happen quite often. In it's
current implementation, the IAL flags is partly handled, but has a
number of shortcomings:
1. The driver runs unnecessarily in a timeout when waiting for an
interrupt.
2. The driver performs 500 ms busy-waiting without any value.
3. Arbitration loss errors may be reported one transfer later than they
occured.
Best regards
Christian
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^ permalink raw reply [flat|nested] 3+ messages in thread
* [PATCH 0/3] i2c: imx: Fix handling of arbitration loss
@ 2020-09-17 12:20 Christian Eggers
2020-09-25 7:03 ` Oleksij Rempel
0 siblings, 1 reply; 3+ messages in thread
From: Christian Eggers @ 2020-09-17 12:20 UTC (permalink / raw)
To: Oleksij Rempel, Shawn Guo, Sascha Hauer, Fabio Estevam
Cc: linux-arm-kernel, linux-kernel, NXP Linux Team,
Pengutronix Kernel Team, linux-i2c
On my (noisy) system, I2C arbitration losses happen quite often. In it's
current implementation, the IAL flag is partly handled, but has a
number of shortcomings:
1. The driver runs unnecessarily in a timeout when waiting for an
interrupt.
2. The driver performs 500 ms busy-waiting without any value.
3. Arbitration loss errors may be reported one transfer later than they
occured.
Best regards
Christian
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH 0/3] i2c: imx: Fix handling of arbitration loss
2020-09-17 12:20 Christian Eggers
@ 2020-09-25 7:03 ` Oleksij Rempel
0 siblings, 0 replies; 3+ messages in thread
From: Oleksij Rempel @ 2020-09-25 7:03 UTC (permalink / raw)
To: Christian Eggers
Cc: Shawn Guo, Sascha Hauer, linux-kernel, Oleksij Rempel,
NXP Linux Team, Pengutronix Kernel Team, Fabio Estevam,
linux-arm-kernel, linux-i2c
On Thu, Sep 17, 2020 at 02:20:26PM +0200, Christian Eggers wrote:
> On my (noisy) system, I2C arbitration losses happen quite often. In it's
> current implementation, the IAL flag is partly handled, but has a
> number of shortcomings:
>
> 1. The driver runs unnecessarily in a timeout when waiting for an
> interrupt.
>
> 2. The driver performs 500 ms busy-waiting without any value.
>
> 3. Arbitration loss errors may be reported one transfer later than they
> occured.
>
> Best regards
> Christian
>
Acked-by: Oleksij Rempel <o.rempel@pengutronix.de>
Thank you!
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