From: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
To: Corentin Labbe <clabbe@baylibre.com>
Cc: gregkh@linuxfoundation.org, hverkuil@xs4all.nl,
laurent.pinchart@ideasonboard.com, devel@driverdev.osuosl.org,
linux-kernel@vger.kernel.org, linux-media@vger.kernel.org
Subject: Re: [PATCH RFT/RFC v2 28/47] staging: media: zoran: convert mdelay to udelay
Date: Thu, 1 Oct 2020 09:54:35 +0200 [thread overview]
Message-ID: <20201001095435.47c7d36c@coco.lan> (raw)
In-Reply-To: <1601058657-14042-29-git-send-email-clabbe@baylibre.com>
Em Fri, 25 Sep 2020 18:30:38 +0000
Corentin Labbe <clabbe@baylibre.com> escreveu:
> As asked by checkpath, let's use udelay.
>
> Signed-off-by: Corentin Labbe <clabbe@baylibre.com>
> ---
> drivers/staging/media/zoran/zoran_device.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/staging/media/zoran/zoran_device.c b/drivers/staging/media/zoran/zoran_device.c
> index 0ecb044f8e8f..4c9f6eafd130 100644
> --- a/drivers/staging/media/zoran/zoran_device.c
> +++ b/drivers/staging/media/zoran/zoran_device.c
> @@ -1332,9 +1332,9 @@ void zoran_init_hardware(struct zoran *zr)
> void zr36057_restart(struct zoran *zr)
> {
> btwrite(0, ZR36057_SPGPPCR);
> - mdelay(1);
> + udelay(1000);
> btor(ZR36057_SPGPPCR_SoftReset, ZR36057_SPGPPCR);
> - mdelay(1);
> + udelay(1000);
Ok, this is still on staging, so I'm willing to accept it, but
why aren't you using usleep_range() instead?
mdelay/udelay should be used only when the delay time should
be as precise as possible, as what they do is to keep the CPU
busy during the wait time.
I doubt that this is the case here. So, I would use,
instead, something like:
usleep_range(1000, 2000)
(assuming that 4ms is still a reasonable time for the soft
reset to happen).
>
> /* assert P_Reset */
> btwrite(0, ZR36057_JPC);
Thanks,
Mauro
next prev parent reply other threads:[~2020-10-01 7:54 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-25 18:30 [PATCH RFT/RFC v2 00/47] staging: media: bring back zoran driver Corentin Labbe
2020-09-25 18:30 ` [PATCH RFT/RFC v2 01/47] staging: media: Revert "media: zoran: remove deprecated driver" Corentin Labbe
[not found] ` <CA+QCeVRjnU6RwHkj3c54pzLq6yeaZ1Lz8eG4vDOkGT5RyKvJhA@mail.gmail.com>
2022-05-07 16:11 ` Laurent Pinchart
2020-09-25 18:30 ` [PATCH RFT/RFC v2 02/47] MAINTAINERS: change maintainer of the zoran driver Corentin Labbe
2020-09-25 18:30 ` [PATCH RFT/RFC v2 03/47] staging: media: zoran: datasheet is no longer available from zoran.com Corentin Labbe
2020-09-25 18:30 ` [PATCH RFT/RFC v2 04/47] staging: media: zoran: Documentation: fix typo Corentin Labbe
2020-09-25 18:30 ` [PATCH RFT/RFC v2 05/47] staging: media: zoran: fix checkpatch issue Corentin Labbe
2020-09-25 18:30 ` [PATCH RFT/RFC v2 06/47] staging: media: zoran: do not forward declare zr36057_init_vfe Corentin Labbe
2020-09-25 18:30 ` [PATCH RFT/RFC v2 07/47] staging: media: zoran: convert all error dprintk to pci_err/pr_err Corentin Labbe
2020-09-25 18:30 ` [PATCH RFT/RFC v2 08/47] staging: media: zoran: convert dprintk warn Corentin Labbe
2020-09-25 18:30 ` [PATCH RFT/RFC v2 09/47] staging: media: zoran: convert dprintk info to pci_info Corentin Labbe
2020-09-25 18:30 ` [PATCH RFT/RFC v2 10/47] staging: media: zoran: convert dprintk debug Corentin Labbe
2020-09-25 18:30 ` [PATCH RFT/RFC v2 11/47] staging: media: zoran: zoran_device.c: convert pr_x to pci_x Corentin Labbe
2020-09-25 18:36 ` Joe Perches
2020-09-25 18:30 ` [PATCH RFT/RFC v2 12/47] staging: media: zoran: remove proc_fs Corentin Labbe
2020-09-25 18:30 ` [PATCH RFT/RFC v2 13/47] staging: media: zoran: use VFL_TYPE_VIDEO Corentin Labbe
2020-09-25 18:30 ` [PATCH RFT/RFC v2 14/47] staging: media: zoran: use v4l2_buffer_set_timestamp Corentin Labbe
2020-09-25 18:30 ` [PATCH RFT/RFC v2 15/47] staging: media: zoran: do not print random guest 0 Corentin Labbe
2020-09-25 18:30 ` [PATCH RFT/RFC v2 16/47] staging: media: zoran: move buffer_size out of zoran_fh Corentin Labbe
2020-09-25 18:30 ` [PATCH RFT/RFC v2 17/47] staging: media: zoran: move v4l_settings " Corentin Labbe
2020-09-25 18:30 ` [PATCH RFT/RFC v2 18/47] staging: media: zoran: move jpg_settings " Corentin Labbe
2020-09-25 18:30 ` [PATCH RFT/RFC v2 19/47] staging: media: zoran: move overlay_settings " Corentin Labbe
2020-09-25 18:30 ` [PATCH RFT/RFC v2 20/47] staging: media: zoran: Use video_drvdata to get struct zoran Corentin Labbe
2020-09-25 18:30 ` [PATCH RFT/RFC v2 21/47] staging: media: zoran: Change zoran_v4l_set_format parameter from zoran_fh to zoran Corentin Labbe
2020-09-25 18:30 ` [PATCH RFT/RFC v2 22/47] staging: media: zoran: remove overlay Corentin Labbe
2020-09-25 18:30 ` [PATCH RFT/RFC v2 23/47] staging: media: zoran: Use DMA coherent for stat_com Corentin Labbe
2020-09-25 18:30 ` [PATCH RFT/RFC v2 24/47] staging: media: zoran: use ZR_NORM Corentin Labbe
2020-09-25 18:30 ` [PATCH RFT/RFC v2 25/47] staging: media: zoran: zoran does not support STD_ALL Corentin Labbe
2020-09-25 18:30 ` [PATCH RFT/RFC v2 26/47] staging: media: zoran: convert irq to pci irq Corentin Labbe
2020-09-25 18:30 ` [PATCH RFT/RFC v2 27/47] staging: media: zoran: convert zoran alloc to devm Corentin Labbe
2020-09-25 18:30 ` [PATCH RFT/RFC v2 28/47] staging: media: zoran: convert mdelay to udelay Corentin Labbe
2020-10-01 7:54 ` Mauro Carvalho Chehab [this message]
2020-09-25 18:30 ` [PATCH RFT/RFC v2 29/47] staging: media: zoran: use devm for videocodec_master alloc Corentin Labbe
2020-09-25 18:30 ` [PATCH RFT/RFC v2 30/47] staging: media: zoran: use pci_request_regions Corentin Labbe
2020-09-25 18:30 ` [PATCH RFT/RFC v2 31/47] staging: media: zoran: use devm_ioremap Corentin Labbe
2020-09-25 18:30 ` [PATCH RFT/RFC v2 32/47] staging: media: zoran: add stat_com buffer Corentin Labbe
2020-09-25 18:30 ` [PATCH RFT/RFC v2 33/47] staging: media: zoran: constify struct tvnorm Corentin Labbe
2020-09-25 18:30 ` [PATCH RFT/RFC v2 34/47] staging: media: zoran: constify codec_name Corentin Labbe
2020-09-25 18:30 ` [PATCH RFT/RFC v2 35/47] staging: media: zoran: Add more check for compliance Corentin Labbe
2020-09-25 18:30 ` [PATCH RFT/RFC v2 36/47] staging: media: zoran: Add vb_queue Corentin Labbe
2020-09-25 18:30 ` [PATCH RFT/RFC v2 37/47] staging: media: zoran: disable output Corentin Labbe
2020-09-25 18:30 ` [PATCH RFT/RFC v2 38/47] staging: media: zoran: device support only 32bit DMA address Corentin Labbe
2020-09-25 18:30 ` [PATCH RFT/RFC v2 39/47] staging: media: zoran: enable makefile Corentin Labbe
2020-09-25 18:30 ` [PATCH RFT/RFC v2 40/47] staging: media: zoran: remove framebuffer support Corentin Labbe
2020-09-25 18:30 ` [PATCH RFT/RFC v2 41/47] staging: media: zoran: add vidioc_g_parm Corentin Labbe
2020-09-25 18:30 ` [PATCH RFT/RFC v2 42/47] staging: media: zoran: remove test_interrupts Corentin Labbe
2020-09-25 18:30 ` [PATCH RFT/RFC v2 43/47] staging: media: zoran: fix use of buffer_size and sizeimage Corentin Labbe
2020-09-25 18:30 ` [PATCH RFT/RFC v2 44/47] staging: media: zoran: fix some compliance test Corentin Labbe
2020-09-25 18:30 ` [PATCH RFT/RFC v2 45/47] staging: media: zoran: remove deprecated .vidioc_g_jpegcomp Corentin Labbe
2020-09-25 18:30 ` [PATCH RFT/RFC v2 46/47] staging: media: zoran: convert to vb2 Corentin Labbe
2020-09-25 18:30 ` [PATCH RFT/RFC v2 47/47] staging: media: zoran: update TODO Corentin Labbe
2020-09-28 13:45 ` [PATCH RFT/RFC v2 00/47] staging: media: bring back zoran driver Hans Verkuil
2020-09-28 13:53 ` Laurent Pinchart
2020-09-28 14:01 ` Hans Verkuil
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