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From:   Chen-Yu Tsai <wenst@chromium.org>
To:     Tiffany Lin <tiffany.lin@mediatek.com>,
        Andrew-CT Chen <andrew-ct.chen@mediatek.com>,
        Yunfei Dong <yunfei.dong@mediatek.com>,
        Mauro Carvalho Chehab <mchehab@kernel.org>,
        Hans Verkuil <hverkuil-cisco@xs4all.nl>
Cc:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@collabora.com>,
        Nicolas Dufresne <nicolas.dufresne@collabora.com>,
        Chen-Yu Tsai <wenst@chromium.org>, linux-media@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-mediatek@lists.infradead.org,
        Matthias Brugger <matthias.bgg@gmail.com>
Subject: [PATCH 3/6] media: mediatek: vcodec: Use default bus_info for decoder capability
Date:   Fri,  1 Jul 2022 18:52:34 +0800
Message-Id: <20220701105237.932332-4-wenst@chromium.org>
In-Reply-To: <20220701105237.932332-1-wenst@chromium.org>
References: <20220701105237.932332-1-wenst@chromium.org>
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Precedence: bulk

Since commit f2d8b6917f3b ("media: v4l: ioctl: Set bus_info in
v4l_querycap()"), the V4L2 core provides a default value for the
bus_info field for platform and PCI devices. This value will match
the default value for media devices added by commit cef699749f37
("media: mc: Set bus_info in media_device_init()"). These defaults
are stable and device-specific.

Drop the custom capability bus_info from the mtk-vcodec decoder
driver, and use the defaults. This also fixes the long standing
issue where the media device used for the stateless decoder didn't
have its bus_info set, and would never match its accompanying video
device.

Signed-off-by: Chen-Yu Tsai <wenst@chromium.org>
---
 drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec.c b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec.c
index 7f03dab518a4..209de1ec02e4 100644
--- a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec.c
+++ b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec.c
@@ -249,7 +249,6 @@ static int vidioc_vdec_querycap(struct file *file, void *priv,
 
 	strscpy(cap->driver, dev->driver->name, sizeof(cap->driver));
 	snprintf(cap->card, sizeof(cap->card), "MT%d video decoder", platform_name);
-	snprintf(cap->bus_info, sizeof(cap->bus_info), "platform:mt%d-dec", platform_name);
 
 	return 0;
 }
-- 
2.37.0.rc0.161.g10f37bed90-goog