From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754791AbdCaJAh (ORCPT ); Fri, 31 Mar 2017 05:00:37 -0400 Received: from smtprelay4.synopsys.com ([198.182.47.9]:35508 "EHLO smtprelay.synopsys.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754181AbdCaJAf (ORCPT ); Fri, 31 Mar 2017 05:00:35 -0400 Subject: Re: [PATCH 3/3] [media] cobalt: Use v4l2_calc_timeperframe helper To: Hans Verkuil , Jose Abreu , References: <070c9e71b359c0f6da7410b5ab9207210925549a.1490095965.git.joabreu@synopsys.com> CC: Carlos Palminha , Mauro Carvalho Chehab , Hans Verkuil , From: Jose Abreu Message-ID: Date: Fri, 31 Mar 2017 09:59:57 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.4.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset="windows-1252" Content-Transfer-Encoding: 7bit X-Originating-IP: [10.107.19.82] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Hans, On 30-03-2017 14:42, Hans Verkuil wrote: > Hi Jose, > > On 21/03/17 12:49, Jose Abreu wrote: >> Currently, cobalt driver always returns 60fps in g_parm. >> This patch uses the new v4l2_calc_timeperframe helper to >> calculate the time per frame value. > I can verify that g_parm works, so: > > Tested-by: Hans Verkuil > > However, the adv7604 pixelclock detection resolution is only 0.25 MHz, so it > can't tell the difference between 24 and 23.97 Hz. I can't set the new > V4L2_DV_FL_CAN_DETECT_REDUCED_FPS flag there. > > It might be possible to implement this for the adv7842 receiver, I think that > that hardware is much more precise. > > I would have to try this, but that will have to wait until Friday next week. Thanks! Yes, maybe its better to test with a different receiver, if it has more precision then its great. Let me know if you need any help :) Best regards, Jose Miguel Abreu > > Regards, > > Hans > >> Signed-off-by: Jose Abreu >> Cc: Carlos Palminha >> Cc: Mauro Carvalho Chehab >> Cc: Hans Verkuil >> Cc: linux-media@vger.kernel.org >> Cc: linux-kernel@vger.kernel.org >> --- >> drivers/media/pci/cobalt/cobalt-v4l2.c | 9 +++++++-- >> 1 file changed, 7 insertions(+), 2 deletions(-) >> >> diff --git a/drivers/media/pci/cobalt/cobalt-v4l2.c b/drivers/media/pci/cobalt/cobalt-v4l2.c >> index def4a3b..25532ae 100644 >> --- a/drivers/media/pci/cobalt/cobalt-v4l2.c >> +++ b/drivers/media/pci/cobalt/cobalt-v4l2.c >> @@ -1076,10 +1076,15 @@ static int cobalt_subscribe_event(struct v4l2_fh *fh, >> >> static int cobalt_g_parm(struct file *file, void *fh, struct v4l2_streamparm *a) >> { >> + struct cobalt_stream *s = video_drvdata(file); >> + struct v4l2_fract fps; >> + >> if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) >> return -EINVAL; >> - a->parm.capture.timeperframe.numerator = 1; >> - a->parm.capture.timeperframe.denominator = 60; >> + >> + fps = v4l2_calc_timeperframe(&s->timings); >> + a->parm.capture.timeperframe.numerator = fps.numerator; >> + a->parm.capture.timeperframe.denominator = fps.denominator; >> a->parm.capture.readbuffers = 3; >> return 0; >> } >>