From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752750AbdK0PZo (ORCPT ); Mon, 27 Nov 2017 10:25:44 -0500 Received: from mga07.intel.com ([134.134.136.100]:44654 "EHLO mga07.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752291AbdK0PZm (ORCPT ); Mon, 27 Nov 2017 10:25:42 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.44,465,1505804400"; d="scan'208";a="1249066332" Message-ID: <1511796338.25007.456.camel@linux.intel.com> Subject: Re: [PATCH v2] [media] staging: atomisp: convert timestamps to ktime_t From: Andy Shevchenko To: Arnd Bergmann , Alan Cox , Sakari Ailus , Mauro Carvalho Chehab , Greg Kroah-Hartman Cc: y2038@lists.linaro.org, linux-media@vger.kernel.org, devel@driverdev.osuosl.org, linux-kernel@vger.kernel.org Date: Mon, 27 Nov 2017 17:25:38 +0200 In-Reply-To: <20171127152256.2184193-1-arnd@arndb.de> References: <20171127152256.2184193-1-arnd@arndb.de> Organization: Intel Finland Oy Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.26.2-1 Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 2017-11-27 at 16:21 +0100, Arnd Bergmann wrote: > timespec overflows in 2038 on 32-bit architectures, and the > getnstimeofday() suffers from possible time jumps, so the > timestamps here are better done using ktime_get(), which has > neither of those problems. > > In case of ov2680, we don't seem to use the timestamp at > all, so I just remove it. > Yep, Reviewed-by: Andy Shevchenko > Signed-off-by: Arnd Bergmann > --- > v2: use min_t() as suggested by Andy Shevchenko > --- > drivers/staging/media/atomisp/i2c/ov2680.h | 1 - > .../staging/media/atomisp/i2c/ov5693/atomisp-ov5693.c | 19 ++++++++ > ----------- > drivers/staging/media/atomisp/i2c/ov5693/ov5693.h | 2 +- > 3 files changed, 9 insertions(+), 13 deletions(-) > > diff --git a/drivers/staging/media/atomisp/i2c/ov2680.h > b/drivers/staging/media/atomisp/i2c/ov2680.h > index bf4897347df7..03f75dd80f87 100644 > --- a/drivers/staging/media/atomisp/i2c/ov2680.h > +++ b/drivers/staging/media/atomisp/i2c/ov2680.h > @@ -174,7 +174,6 @@ struct ov2680_format { > struct mutex input_lock; > struct v4l2_ctrl_handler ctrl_handler; > struct camera_sensor_platform_data *platform_data; > - struct timespec timestamp_t_focus_abs; > int vt_pix_clk_freq_mhz; > int fmt_idx; > int run_mode; > diff --git a/drivers/staging/media/atomisp/i2c/ov5693/atomisp-ov5693.c > b/drivers/staging/media/atomisp/i2c/ov5693/atomisp-ov5693.c > index 3e7c3851280f..9fa25bb8f1ee 100644 > --- a/drivers/staging/media/atomisp/i2c/ov5693/atomisp-ov5693.c > +++ b/drivers/staging/media/atomisp/i2c/ov5693/atomisp-ov5693.c > @@ -973,7 +973,7 @@ static int ov5693_t_focus_abs(struct v4l2_subdev > *sd, s32 value) > if (ret == 0) { > dev->number_of_steps = value - dev->focus; > dev->focus = value; > - getnstimeofday(&(dev->timestamp_t_focus_abs)); > + dev->timestamp_t_focus_abs = ktime_get(); > } else > dev_err(&client->dev, > "%s: i2c failed. ret %d\n", __func__, ret); > @@ -993,16 +993,13 @@ static int ov5693_q_focus_status(struct > v4l2_subdev *sd, s32 *value) > { > u32 status = 0; > struct ov5693_device *dev = to_ov5693_sensor(sd); > - struct timespec temptime; > - const struct timespec timedelay = { > - 0, > - min((u32)abs(dev->number_of_steps) * > DELAY_PER_STEP_NS, > - (u32)DELAY_MAX_PER_STEP_NS), > - }; > - > - getnstimeofday(&temptime); > - temptime = timespec_sub(temptime, (dev- > >timestamp_t_focus_abs)); > - if (timespec_compare(&temptime, &timedelay) <= 0) { > + ktime_t temptime; > + ktime_t timedelay = ns_to_ktime(min_t(u32, > + abs(dev->number_of_steps) * > DELAY_PER_STEP_NS, > + DELAY_MAX_PER_STEP_NS)); > + > + temptime = ktime_sub(ktime_get(), (dev- > >timestamp_t_focus_abs)); > + if (ktime_compare(temptime, timedelay) <= 0) { > status |= ATOMISP_FOCUS_STATUS_MOVING; > status |= ATOMISP_FOCUS_HP_IN_PROGRESS; > } else { > diff --git a/drivers/staging/media/atomisp/i2c/ov5693/ov5693.h > b/drivers/staging/media/atomisp/i2c/ov5693/ov5693.h > index 2ea63807c56d..68cfcb4a6c3c 100644 > --- a/drivers/staging/media/atomisp/i2c/ov5693/ov5693.h > +++ b/drivers/staging/media/atomisp/i2c/ov5693/ov5693.h > @@ -221,7 +221,7 @@ struct ov5693_device { > struct v4l2_ctrl_handler ctrl_handler; > > struct camera_sensor_platform_data *platform_data; > - struct timespec timestamp_t_focus_abs; > + ktime_t timestamp_t_focus_abs; > int vt_pix_clk_freq_mhz; > int fmt_idx; > int run_mode; -- Andy Shevchenko Intel Finland Oy