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Message-ID: <2bb4868b-90ab-887e-bf13-9de8b79231bd@microchip.com>
Date: Fri, 10 Jun 2022 07:35:00 +0000
From: <Codrin.Ciubotariu@...rochip.com>
To: <peda@...ntia.se>, <linux-i2c@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>
CC: <Ludovic.Desroches@...rochip.com>, <Nicolas.Ferre@...rochip.com>,
<alexandre.belloni@...tlin.com>, <robh+dt@...nel.org>,
<wsa@...nel.org>, <kamel.bouhara@...tlin.com>
Subject: Re: Regression: at24 eeprom writing times out on sama5d3
On 09.06.2022 17:28, Peter Rosin wrote:
> Hi!
Hi Peter,
>
> I have not actually bisected this issue but reverting the effects of
> patch a4bd8da893a3 ("ARM: dts: at91: sama5d3: add i2c gpio pinctrl")
> makes the problem go away.
>
> I.e. I need something like this in my dts
>
> &i2c2 {
> status = "okay";
>
> pinctrl-names = "default";
> /delete-property/ pinctrl-1;
> /delete-property/ sda-gpios;
> /delete-property/ scl-gpios;
>
> eeprom@50 {
> compatible = "st,24c64", "atmel,24c64";
> reg = <0x50>;
> wp-gpios = <&filter_gpio 7 GPIO_ACTIVE_HIGH>;
> };
> };
>
> for multi-page eeprom writes to not time out (a page is 32 bytes on this
> eeprom).
>
> For reference, the current defaults for this SoC/I2C-bus, that I modify,
> are:
>
> pinctrl-names = "default", "gpio";
> pinctrl-0 = <&pinctrl_i2c2>;
> pinctrl-1 = <&pinctrl_i2c2_gpio>;
> sda-gpios = <&pioA 18 GPIO_ACTIVE_HIGH>;
> scl-gpios = <&pioA 19 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
>
> I suspect that the underlying reason is that the bus recovery takes
> too long and that the at24 eeprom driver gives up prematurely. I doubt
> that this is chip specific, but I don't know that.
>
> I can work around the issue in user space with by writing in 4 byte
> chunks, like so
>
> dd if=source.file of=/sys/bus/i2c/devices/2-0050/eeprom obs=4
>
> but that is really ugly and gets slow too, about 20 seconds to program
> the full 8kB eeprom. With the above in my dts it takes a second or
> so (a bit more with dynamic debug active).
>
>
> If I run
>
> dd if=source.file of=/sys/bus/i2c/devices/2-0050/eeprom
>
> with a source.file of 8kB and the upstream dts properties in place, I can
> collect the following debug output from at24, i2c-core and i2c-at91:
>
> Jun 9 15:56:34 me20 kernel: i2c i2c-2: at91_xfer: processing 1 messages:
> Jun 9 15:56:34 me20 kernel: at91_i2c f801c000.i2c: transfer: write 34 bytes.
> Jun 9 15:56:34 me20 kernel: at91_i2c f801c000.i2c: transfer complete
> Jun 9 15:56:34 me20 kernel: at24 2-0050: write 32@0 --> 0 (-23170)
> Jun 9 15:56:34 me20 kernel: i2c i2c-2: at91_xfer: processing 1 messages:
> Jun 9 15:56:34 me20 kernel: at91_i2c f801c000.i2c: transfer: write 34 bytes.
> Jun 9 15:56:34 me20 kernel: at91_i2c f801c000.i2c: received nack
> Jun 9 15:56:34 me20 kernel: i2c i2c-2: Trying i2c bus recovery
> Jun 9 15:56:34 me20 kernel: at24 2-0050: write 32@32 --> -121 (-23169)
> Jun 9 15:56:34 me20 kernel: i2c i2c-2: at91_xfer: processing 1 messages:
> Jun 9 15:56:34 me20 kernel: at91_i2c f801c000.i2c: transfer: write 34 bytes.
> Jun 9 15:56:34 me20 kernel: at91_i2c f801c000.i2c: transfer complete
> Jun 9 15:56:34 me20 kernel: at24 2-0050: write 32@32 --> 0 (-23168)
> Jun 9 15:56:34 me20 kernel: i2c i2c-2: at91_xfer: processing 1 messages:
> Jun 9 15:56:34 me20 kernel: at91_i2c f801c000.i2c: transfer: write 34 bytes.
> Jun 9 15:56:34 me20 kernel: at91_i2c f801c000.i2c: received nack
> Jun 9 15:56:34 me20 kernel: i2c i2c-2: Trying i2c bus recovery
> Jun 9 15:56:34 me20 kernel: at24 2-0050: write 32@64 --> -121 (-23168)
> Jun 9 15:56:34 me20 kernel: i2c i2c-2: at91_xfer: processing 1 messages:
> Jun 9 15:56:34 me20 kernel: at91_i2c f801c000.i2c: transfer: write 34 bytes.
> Jun 9 15:56:34 me20 kernel: at91_i2c f801c000.i2c: transfer complete
> Jun 9 15:56:34 me20 kernel: at24 2-0050: write 32@64 --> 0 (-23167)
> Jun 9 15:56:34 me20 kernel: i2c i2c-2: at91_xfer: processing 1 messages:
> Jun 9 15:56:34 me20 kernel: at91_i2c f801c000.i2c: transfer: write 34 bytes.
> Jun 9 15:56:34 me20 kernel: at91_i2c f801c000.i2c: received nack
> Jun 9 15:56:34 me20 kernel: i2c i2c-2: Trying i2c bus recovery
> Jun 9 15:56:34 me20 kernel: at24 2-0050: write 32@96 --> -121 (-23167)
> Jun 9 15:56:34 me20 kernel: i2c i2c-2: at91_xfer: processing 1 messages:
> Jun 9 15:56:34 me20 kernel: at91_i2c f801c000.i2c: transfer: write 34 bytes.
> Jun 9 15:56:34 me20 kernel: at91_i2c f801c000.i2c: controller timed out
> Jun 9 15:56:34 me20 kernel: i2c i2c-2: Trying i2c bus recovery
> Jun 9 15:56:34 me20 kernel: at24 2-0050: write 32@96 --> -110 (-23155)
> Jun 9 15:56:34 me20 kernel: i2c i2c-2: at91_xfer: processing 1 messages:
> Jun 9 15:56:34 me20 kernel: at91_i2c f801c000.i2c: transfer: write 34 bytes.
> Jun 9 15:56:34 me20 kernel: at91_i2c f801c000.i2c: controller timed out
> Jun 9 15:56:34 me20 kernel: i2c i2c-2: Trying i2c bus recovery
> Jun 9 15:56:34 me20 kernel: at24 2-0050: write 32@96 --> -110 (-23143)
>
> And then there is no more action. I.e. only a couple of 32 byte pages
> are written.
>
> With the above mentioned dts override in place I instead get this, which is
> a lot more sensible:
>
> Jun 9 15:48:53 me20 kernel: i2c i2c-2: at91_xfer: processing 1 messages:
> Jun 9 15:48:53 me20 kernel: at91_i2c f801c000.i2c: transfer: write 34 bytes.
> Jun 9 15:48:53 me20 kernel: at91_i2c f801c000.i2c: transfer complete
> Jun 9 15:48:53 me20 kernel: at24 2-0050: write 32@0 --> 0 (753629)
> Jun 9 15:48:53 me20 kernel: i2c i2c-2: at91_xfer: processing 1 messages:
> Jun 9 15:48:53 me20 kernel: at91_i2c f801c000.i2c: transfer: write 34 bytes.
> Jun 9 15:48:53 me20 kernel: at91_i2c f801c000.i2c: received nack
> Jun 9 15:48:53 me20 kernel: at24 2-0050: write 32@32 --> -121 (753629)
> Jun 9 15:48:53 me20 kernel: i2c i2c-2: at91_xfer: processing 1 messages:
> Jun 9 15:48:53 me20 kernel: at91_i2c f801c000.i2c: transfer: write 34 bytes.
> Jun 9 15:48:53 me20 kernel: at91_i2c f801c000.i2c: transfer complete
> Jun 9 15:48:53 me20 kernel: at24 2-0050: write 32@32 --> 0 (753630)
> Jun 9 15:48:53 me20 kernel: i2c i2c-2: at91_xfer: processing 1 messages:
> Jun 9 15:48:53 me20 kernel: at91_i2c f801c000.i2c: transfer: write 34 bytes.
> Jun 9 15:48:53 me20 kernel: at91_i2c f801c000.i2c: received nack
> Jun 9 15:48:53 me20 kernel: at24 2-0050: write 32@64 --> -121 (753630)
> Jun 9 15:48:53 me20 kernel: i2c i2c-2: at91_xfer: processing 1 messages:
> Jun 9 15:48:53 me20 kernel: at91_i2c f801c000.i2c: transfer: write 34 bytes.
> Jun 9 15:48:53 me20 kernel: at91_i2c f801c000.i2c: transfer complete
> Jun 9 15:48:53 me20 kernel: at24 2-0050: write 32@64 --> 0 (753631)
> Jun 9 15:48:53 me20 kernel: i2c i2c-2: at91_xfer: processing 1 messages:
> Jun 9 15:48:53 me20 kernel: at91_i2c f801c000.i2c: transfer: write 34 bytes.
> Jun 9 15:48:53 me20 kernel: at91_i2c f801c000.i2c: received nack
> Jun 9 15:48:53 me20 kernel: at24 2-0050: write 32@96 --> -121 (753631)
> Jun 9 15:48:53 me20 kernel: i2c i2c-2: at91_xfer: processing 1 messages:
> Jun 9 15:48:53 me20 kernel: at91_i2c f801c000.i2c: transfer: write 34 bytes.
> Jun 9 15:48:53 me20 kernel: at91_i2c f801c000.i2c: transfer complete
> Jun 9 15:48:53 me20 kernel: at24 2-0050: write 32@96 --> 0 (753632)
> Jun 9 15:48:53 me20 kernel: i2c i2c-2: at91_xfer: processing 1 messages:
> Jun 9 15:48:53 me20 kernel: at91_i2c f801c000.i2c: transfer: write 34 bytes.
> Jun 9 15:48:53 me20 kernel: at91_i2c f801c000.i2c: received nack
> Jun 9 15:48:53 me20 kernel: at24 2-0050: write 32@128 --> -121 (753632)
> Jun 9 15:48:53 me20 kernel: i2c i2c-2: at91_xfer: processing 1 messages:
> Jun 9 15:48:53 me20 kernel: at91_i2c f801c000.i2c: transfer: write 34 bytes.
> Jun 9 15:48:53 me20 kernel: at91_i2c f801c000.i2c: transfer complete
> Jun 9 15:48:53 me20 kernel: at24 2-0050: write 32@128 --> 0 (753633)
> Jun 9 15:48:53 me20 kernel: i2c i2c-2: at91_xfer: processing 1 messages:
> Jun 9 15:48:53 me20 kernel: at91_i2c f801c000.i2c: transfer: write 34 bytes.
> Jun 9 15:48:53 me20 kernel: at91_i2c f801c000.i2c: received nack
> Jun 9 15:48:53 me20 kernel: at24 2-0050: write 32@160 --> -121 (753633)
> Jun 9 15:48:53 me20 kernel: i2c i2c-2: at91_xfer: processing 1 messages:
> Jun 9 15:48:53 me20 kernel: at91_i2c f801c000.i2c: transfer: write 34 bytes.
> Jun 9 15:48:53 me20 kernel: at91_i2c f801c000.i2c: transfer complete
> Jun 9 15:48:53 me20 kernel: at24 2-0050: write 32@160 --> 0 (753634)
> ... snip ...
> Jun 9 15:48:55 me20 kernel: i2c i2c-2: at91_xfer: processing 1 messages:
> Jun 9 15:48:55 me20 kernel: at91_i2c f801c000.i2c: transfer: write 34 bytes.
> Jun 9 15:48:55 me20 kernel: at91_i2c f801c000.i2c: received nack
> Jun 9 15:48:55 me20 kernel: at24 2-0050: write 32@...8 --> -121 (753883)
> Jun 9 15:48:55 me20 kernel: i2c i2c-2: at91_xfer: processing 1 messages:
> Jun 9 15:48:55 me20 kernel: at91_i2c f801c000.i2c: transfer: write 34 bytes.
> Jun 9 15:48:55 me20 kernel: at91_i2c f801c000.i2c: transfer complete
> Jun 9 15:48:55 me20 kernel: at24 2-0050: write 32@...8 --> 0 (753884)
> Jun 9 15:48:55 me20 kernel: i2c i2c-2: at91_xfer: processing 1 messages:
> Jun 9 15:48:55 me20 kernel: at91_i2c f801c000.i2c: transfer: write 34 bytes.
> Jun 9 15:48:55 me20 kernel: at91_i2c f801c000.i2c: received nack
> Jun 9 15:48:55 me20 kernel: at24 2-0050: write 32@...0 --> -121 (753884)
> Jun 9 15:48:55 me20 kernel: i2c i2c-2: at91_xfer: processing 1 messages:
> Jun 9 15:48:55 me20 kernel: at91_i2c f801c000.i2c: transfer: write 34 bytes.
> Jun 9 15:48:55 me20 kernel: at91_i2c f801c000.i2c: transfer complete
> Jun 9 15:48:55 me20 kernel: at24 2-0050: write 32@...0 --> 0 (753885)
could you please apply this patch-set [1] and let us know if it
addresses your issue?
Thanks and best regards,
Codrin
https://patchwork.ozlabs.org/project/linux-i2c/list/?series=255408
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