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Tue, 29 Sep 2026 14:38:23 +0000 Date: Tue, 29 Sep 2026 09:38:14 -0500 From: Frank Li To: Ming Qian Cc: Mauro Carvalho Chehab , Hans Verkuil , Nicolas Dufresne , Ming Qian , Zhou Peng , Elliot Chen , Frank Li , linux-imx@nxp.com, imx@lists.linux.dev, linux-media@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v2] media: amphion: Add V4L2_FMT_FLAG_DYN_RESOLUTION for VC1L Message-ID: References: <20260929-flag-dyn-resolution-v2-1-ef29487f7215@oss.nxp.com> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260929-flag-dyn-resolution-v2-1-ef29487f7215@oss.nxp.com> X-ClientProxiedBy: CY8PR11CA0041.namprd11.prod.outlook.com (2603:10b6:930:4a::13) To GV2PR04MB11799.eurprd04.prod.outlook.com (2603:10a6:150:2cf::9) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: GV2PR04MB11799:EE_|AM9PR04MB8066:EE_ X-MS-Office365-Filtering-Correlation-Id: d181d1e3-3d5e-4768-9b87-08df1e37507b X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|1800799024|23010399003|376014|19092799006|18002099003|22082099003|3023799007|10067099003|56012099006|11063799006|6133799003; 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Without V4L2_FMT_FLAG_DYN_RESOLUTION, userspace (e.g. > GStreamer) cannot determine that the driver will signal the initial > resolution, causing it to skip waiting for the event and fail to set up > the CAPTURE queue properly. > > Add V4L2_FMT_FLAG_DYN_RESOLUTION to the VC1 Annex L format entry to > indicate that the decoder will emit the source change event during > initialization, consistent with other coded formats supported by this > driver. > > Fixes: e670f5d672ef ("media: amphion: only insert the first sequence startcode for vc1l format") > Reviewed-by: Nicolas Dufresne > Signed-off-by: Ming Qian Reviewed-by: Frank Li > --- > Changes in v2: > - Drop the documentation patch. Nicolas pointed out that > V4L2_FMT_FLAG_DYN_RESOLUTION postdates the stateful decoder spec, so any > driver setting it is already required to follow that spec. The > non-compliant drivers (coda, s5p-mfc) are pre-spec history and not worth > bending the spec text around. > - Drop the RFC prefix, as requested by Nicolas. > - Link to v1: https://patch.msgid.link/20260608-flag-dyn-resolution-v1-0-44dc65516148@oss.nxp.com > --- > drivers/media/platform/amphion/vdec.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/media/platform/amphion/vdec.c b/drivers/media/platform/amphion/vdec.c > index a9f0521f2e1a..75808482d090 100644 > --- a/drivers/media/platform/amphion/vdec.c > +++ b/drivers/media/platform/amphion/vdec.c > @@ -136,7 +136,7 @@ static const struct vpu_format vdec_formats[] = { > .mem_planes = 1, > .comp_planes = 1, > .type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE, > - .flags = V4L2_FMT_FLAG_COMPRESSED > + .flags = V4L2_FMT_FLAG_DYN_RESOLUTION | V4L2_FMT_FLAG_COMPRESSED > }, > { > .pixfmt = V4L2_PIX_FMT_MPEG2, > > --- > base-commit: 2dcdfb625c3b8fe87454e19dfbc54b3e3f0ad70e > change-id: 20260608-flag-dyn-resolution-f39fd24a0ba2 > >