From: Andi Shyti <andi.shyti@kernel.org>
To: Hans Hu <hanshu-oc@zhaoxin.com>
Cc: wsa@kernel.org, linux-i2c@vger.kernel.org, cobechen@zhaoxin.com
Subject: Re: [PATCH v6 6/8] i2c: wmt: fix a bug when thread blocked
Date: Wed, 3 Jan 2024 20:39:11 +0100 [thread overview]
Message-ID: <20240103193911.qbc5m5yz7cbi5l7u@zenone.zhora.eu> (raw)
In-Reply-To: <b0f284621b6763c32133d39be83f05f1184b3635.1703830854.git.hanshu-oc@zhaoxin.com>
Hi Hans,
[...]
> static int viai2c_wait_bus_ready(struct viai2c *i2c)
> {
> @@ -25,12 +26,35 @@ static int viai2c_wait_bus_ready(struct viai2c *i2c)
> static int viai2c_wait_status(struct viai2c *i2c)
> {
> int ret = 0;
> - unsigned long wait_result;
> + unsigned long time_left;
> + unsigned long delta_ms;
> +
> + time_left = wait_for_completion_timeout(&i2c->complete,
> + VIAI2C_TIMEOUT);
> + if (!time_left) {
> + dev_err(i2c->dev, "bus transfer timeout\n");
> + return -EIO;
> + }
>
> - wait_result = wait_for_completion_timeout(&i2c->complete,
> - msecs_to_jiffies(500));
> - if (!wait_result)
> - return -ETIMEDOUT;
this change is unrelated. Why are you changing the timeout here
from 500 to 1000?
> + /*
> + * During each byte access, the host performs clock stretching.
> + * In this case, the thread may be interrupted by preemption,
> + * resulting in a long stretching time.
> + * However, some touchpad can only tolerate host clock stretching
> + * of no more than 200 ms. We reduce the impact of this through
> + * a retransmission mechanism.
> + */
is the hardware sending the stretching on its own?
> + local_irq_disable();
> + i2c->to = ktime_get();
> + delta_ms = ktime_to_ms(ktime_sub(i2c->to, i2c->ti));
> + if (delta_ms > VIAI2C_STRETCHING_TIMEOUT) {
> + local_irq_enable();
> + dev_warn(i2c->dev, "thread blocked more than %ldms\n",
> + delta_ms);
> + return -EAGAIN;
> + }
> + i2c->ti = i2c->to;
> + local_irq_enable();
>
> if (i2c->cmd_status & VIAI2C_ISR_NACK_ADDR)
> ret = -EIO;
> @@ -184,6 +208,7 @@ int viai2c_xfer(struct i2c_adapter *adap,
> int ret = 0;
> struct viai2c *i2c = i2c_get_adapdata(adap);
>
> + i2c->to = i2c->ti = ktime_get();
> for (i = 0; ret >= 0 && i < num; i++) {
> pmsg = &msgs[i];
> if (!(pmsg->flags & I2C_M_NOSTART)) {
> diff --git a/drivers/i2c/busses/i2c-viai2c-common.h b/drivers/i2c/busses/i2c-viai2c-common.h
> index f171f81e4d0f..73a88398d763 100644
> --- a/drivers/i2c/busses/i2c-viai2c-common.h
> +++ b/drivers/i2c/busses/i2c-viai2c-common.h
> @@ -58,6 +58,8 @@ struct viai2c {
> u16 tcr;
> int irq;
> u16 cmd_status;
> + ktime_t ti;
> + ktime_t to;
don't these need some arbitration?
Andi
next prev parent reply other threads:[~2024-01-03 19:39 UTC|newest]
Thread overview: 133+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-11-02 2:53 [PATCH v3 00/12] i2c: add zhaoxin i2c controller driver Hans Hu
2023-11-02 2:53 ` [PATCH v3 01/12] i2c: wmt: Reduce redundant: bus busy check Hans Hu
2023-12-22 9:33 ` Wolfram Sang
2023-11-02 2:53 ` [PATCH v3 02/12] i2c: wmt: Reduce redundant: wait event complete Hans Hu
2023-12-22 9:34 ` Wolfram Sang
2023-11-02 2:53 ` [PATCH v3 03/12] i2c: wmt: Reduce redundant: clock mode setting Hans Hu
2023-12-22 9:36 ` Wolfram Sang
2023-11-02 2:53 ` [PATCH v3 04/12] i2c: wmt: Reduce redundant: REG_CR setting Hans Hu
2023-12-22 9:38 ` Wolfram Sang
2023-12-22 10:15 ` Wolfram Sang
2023-11-02 2:53 ` [PATCH v3 05/12] i2c: wmt: Reduce redundant: function parameter Hans Hu
2023-12-22 9:48 ` Wolfram Sang
2023-11-02 2:53 ` [PATCH v3 06/12] i2c: wmt: delete .remove_new Hans Hu
2023-12-22 9:51 ` Wolfram Sang
2023-11-02 2:53 ` [PATCH v3 07/12] i2c: wmt: create wmt_i2c_init for general init Hans Hu
2023-12-22 10:26 ` Wolfram Sang
2023-12-22 10:55 ` Hans Hu
2023-12-22 11:00 ` Wolfram Sang
2023-11-02 2:53 ` [PATCH v3 08/12] i2c: wmt: rename marcos with prefix WMTI2C_ Hans Hu
2023-11-02 2:53 ` [PATCH v3 09/12] i2c: wmt: adjust line length to meet style Hans Hu
2023-11-02 2:54 ` [PATCH v3 10/12] i2c: wmt: split out common files Hans Hu
2023-11-02 2:54 ` [PATCH v3 11/12] i2c: via-common: add zhaoxin platform Hans Hu
2023-11-02 2:54 ` [PATCH v3 12/12] i2c: add zhaoxin i2c controller driver Hans Hu
2023-11-08 9:50 ` [PATCH v3 00/12] " Wolfram Sang
2023-12-27 4:39 ` [PATCH v4 0/8] " Hans Hu
2023-12-27 4:39 ` [PATCH v4 1/8] i2c: wmt: create wmt_i2c_init for general init Hans Hu
2023-12-27 19:00 ` Wolfram Sang
2023-12-28 2:05 ` Hans Hu
2023-12-27 4:39 ` [PATCH v4 2/8] i2c: wmt: rename marcos with prefix WMTI2C_ Hans Hu
2023-12-27 4:39 ` [PATCH v4 3/8] i2c: wmt: adjust line length to meet style Hans Hu
2023-12-27 4:39 ` [PATCH v4 4/8] i2c: wmt: split out common files Hans Hu
2023-12-27 4:39 ` [PATCH v4 5/8] i2c: wmt: rename with prefix VIAI2C_ and viai2c_ Hans Hu
2023-12-27 4:39 ` [PATCH v4 6/8] i2c: wmt: fix a bug when thread blocked Hans Hu
2023-12-27 4:39 ` [PATCH v4 7/8] i2c: wmt: add platform type VIAI2C_PLAT_WMT Hans Hu
2023-12-27 4:39 ` [PATCH v4 8/8] i2c: add zhaoxin i2c controller driver Hans Hu
2023-12-28 3:17 ` [PATCH v5 0/8] " Hans Hu
2023-12-28 3:17 ` [PATCH v5 1/8] i2c: wmt: create wmt_i2c_init for general init Hans Hu
2023-12-28 3:17 ` [PATCH v5 2/8] i2c: wmt: rename marcos with prefix WMTI2C_ Hans Hu
2023-12-28 3:17 ` [PATCH v5 3/8] i2c: wmt: adjust line length to meet style Hans Hu
2023-12-28 3:17 ` [PATCH v5 4/8] i2c: wmt: split out common files Hans Hu
2023-12-28 3:17 ` [PATCH v5 5/8] i2c: wmt: rename with prefix VIAI2C_ and viai2c_ Hans Hu
2023-12-28 3:17 ` [PATCH v5 6/8] i2c: wmt: fix a bug when thread blocked Hans Hu
2023-12-28 3:17 ` [PATCH v5 7/8] i2c: wmt: add platform type VIAI2C_PLAT_WMT Hans Hu
2023-12-28 3:17 ` [PATCH v5 8/8] i2c: add zhaoxin i2c controller driver Hans Hu
2023-12-29 5:17 ` kernel test robot
2023-12-29 6:30 ` [PATCH v6 0/8] " Hans Hu
2023-12-29 6:30 ` [PATCH v6 1/8] i2c: wmt: create wmt_i2c_init for general init Hans Hu
2024-01-03 12:56 ` Andi Shyti
2024-01-04 1:44 ` Hans Hu
2023-12-29 6:30 ` [PATCH v6 2/8] i2c: wmt: rename marcos with prefix WMTI2C_ Hans Hu
2024-01-03 13:29 ` Andi Shyti
2023-12-29 6:30 ` [PATCH v6 3/8] i2c: wmt: adjust line length to meet style Hans Hu
2024-01-03 16:52 ` Andi Shyti
2024-01-04 1:49 ` Hans Hu
2023-12-29 6:30 ` [PATCH v6 4/8] i2c: wmt: split out common files Hans Hu
2024-01-03 17:21 ` Andi Shyti
2024-01-04 2:04 ` Hans Hu
2024-01-04 9:22 ` Andi Shyti
2024-01-04 9:45 ` Hans Hu
2024-01-04 12:36 ` Andi Shyti
2023-12-29 6:30 ` [PATCH v6 5/8] i2c: wmt: rename with prefix VIAI2C_ and viai2c_ Hans Hu
2024-01-03 18:45 ` Andi Shyti
2024-01-04 2:12 ` Hans Hu
2023-12-29 6:30 ` [PATCH v6 6/8] i2c: wmt: fix a bug when thread blocked Hans Hu
2024-01-03 19:39 ` Andi Shyti [this message]
2024-01-04 2:30 ` Hans Hu
2024-01-04 9:18 ` Andi Shyti
2024-01-04 10:02 ` Hans Hu
2024-01-04 12:37 ` Andi Shyti
2023-12-29 6:30 ` [PATCH v6 7/8] i2c: wmt: add platform type VIAI2C_PLAT_WMT Hans Hu
2023-12-29 6:30 ` [PATCH v6 8/8] i2c: add zhaoxin i2c controller driver Hans Hu
2024-01-03 20:02 ` Andi Shyti
2024-01-04 2:40 ` Hans Hu
2024-01-03 20:03 ` [PATCH v6 0/8] " Andi Shyti
2024-01-05 7:51 ` [PATCH v7 0/6] " Hans Hu
2024-01-05 7:51 ` [PATCH v7 1/6] i2c: wmt: create wmt_i2c_init for general init Hans Hu
2024-01-15 15:17 ` Krzysztof Kozlowski
2024-01-16 1:43 ` Hans Hu
2024-01-21 23:56 ` Andi Shyti
2024-02-21 12:10 ` Wolfram Sang
2024-01-05 7:51 ` [PATCH v7 2/6] i2c: wmt: split out common files Hans Hu
2024-02-21 12:19 ` Wolfram Sang
2024-01-05 7:51 ` [PATCH v7 3/6] i2c: wmt: rename something Hans Hu
2024-02-21 12:34 ` Wolfram Sang
2024-01-05 7:51 ` [PATCH v7 4/6] i2c: wmt: fix a bug when thread blocked Hans Hu
2024-02-21 12:37 ` Wolfram Sang
2024-02-22 9:03 ` Hans Hu
2024-02-22 9:37 ` Wolfram Sang
2024-02-22 10:42 ` Hans Hu
2024-02-22 17:26 ` Wolfram Sang
2024-01-05 7:51 ` [PATCH v7 5/6] i2c: wmt: add platform type VIAI2C_PLAT_WMT Hans Hu
2024-02-21 12:39 ` Wolfram Sang
2024-02-22 8:50 ` Hans Hu
2024-01-05 7:51 ` [PATCH v7 6/6] i2c: add zhaoxin i2c controller driver Hans Hu
2024-02-21 12:44 ` Wolfram Sang
2024-02-22 8:49 ` Hans Hu
2024-02-27 6:36 ` [PATCH v8 0/6] " Hans Hu
2024-02-27 6:36 ` [PATCH v8 1/6] i2c: wmt: create wmt_i2c_init for general init Hans Hu
2024-02-27 6:36 ` [PATCH v8 2/6] i2c: wmt: split out common files Hans Hu
2024-02-27 6:36 ` [PATCH v8 3/6] i2c: wmt: rename something Hans Hu
2024-02-27 6:36 ` [PATCH v8 4/6] i2c: wmt: fix a bug when thread blocked Hans Hu
2024-03-04 9:41 ` Wolfram Sang
2024-02-27 6:36 ` [PATCH v8 5/6] i2c: wmt: add platform type VIAI2C_PLAT_WMT Hans Hu
2024-03-04 9:46 ` Wolfram Sang
2024-02-27 6:36 ` [PATCH v8 6/6] i2c: add zhaoxin i2c controller driver Hans Hu
2024-03-04 9:49 ` Wolfram Sang
2024-03-04 23:01 ` [SPAM] " Andi Shyti
2024-03-05 2:45 ` Hans Hu
2024-03-06 11:50 ` Andi Shyti
2024-03-06 16:54 ` Wolfram Sang
2024-03-06 21:24 ` [PATCH v9 0/6] " Andi Shyti
2024-03-06 21:24 ` [PATCH v9 1/6] i2c: wmt: create wmt_i2c_init for general init Andi Shyti
2024-03-06 21:24 ` [PATCH v9 2/6] i2c: wmt: split out common files Andi Shyti
2024-03-06 21:24 ` [PATCH v9 3/6] i2c: wmt: rename something Andi Shyti
2024-03-06 21:24 ` [PATCH v9 4/6] i2c: wmt: fix a bug when thread blocked Andi Shyti
2024-03-06 21:24 ` [PATCH v9 5/6] i2c: wmt: add platform type VIAI2C_PLAT_WMT Andi Shyti
2024-03-06 21:24 ` [PATCH v9 6/6] i2c: add zhaoxin i2c controller driver Andi Shyti
2024-03-08 1:22 ` [PATCH v9 0/6] " Hans Hu
2024-03-08 12:30 ` Andi Shyti
2024-04-03 23:29 ` Andi Shyti
2024-04-07 1:36 ` Hans Hu
2024-04-08 2:54 ` [PATCH v10 " Hans Hu
2024-04-08 2:54 ` [PATCH v10 1/6] i2c: wmt: create wmt_i2c_init for general init Hans Hu
2024-04-23 11:23 ` Andi Shyti
2024-04-08 2:54 ` [PATCH v10 2/6] i2c: wmt: split out common files Hans Hu
2024-04-08 2:54 ` [PATCH v10 3/6] i2c: wmt: rename something Hans Hu
2024-04-23 11:54 ` Andi Shyti
2024-04-08 2:54 ` [PATCH v10 4/6] i2c: wmt: fix a bug when thread blocked Hans Hu
2024-04-08 2:54 ` [PATCH v10 5/6] i2c: wmt: add platform type VIAI2C_PLAT_WMT Hans Hu
2024-04-08 2:54 ` [PATCH v10 6/6] i2c: add zhaoxin i2c controller driver Hans Hu
2024-04-23 12:02 ` [PATCH v10 0/6] " Andi Shyti
2024-04-23 12:16 ` Hans Hu
2024-04-29 0:20 ` Andi Shyti
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