linux-kernel - [PATCH 1/6] media: mediatek: vcodec: Revert driver name change in decoder capabilities

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Date:   Fri,  1 Jul 2022 18:52:32 +0800
From:   Chen-Yu Tsai <wenst@...omium.org>
To:     Tiffany Lin <tiffany.lin@...iatek.com>,
        Andrew-CT Chen <andrew-ct.chen@...iatek.com>,
        Yunfei Dong <yunfei.dong@...iatek.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>
Cc:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Nicolas Dufresne <nicolas.dufresne@...labora.com>,
        Chen-Yu Tsai <wenst@...omium.org>, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mediatek@...ts.infradead.org,
        Matthias Brugger <matthias.bgg@...il.com>
Subject: [PATCH 1/6] media: mediatek: vcodec: Revert driver name change in decoder capabilities

This partially reverts commit a8a7a278c56ad3b4ddd4db9a960e0537d032b0b3.

This recent change caused ChromeOS's decoder to no longer function. This
is due to ChromeOS using the driver name field to match the video device
with its accompanying media device. After the change, they no longer
matched.

The driver name field should contain the actual driver name, not some
otherwise unused string macro from the driver. To make this clear,
copy the name from the driver's name field.

Fixes: a8a7a278c56a ("media: mediatek: vcodec: Change decoder v4l2 capability value")
Signed-off-by: Chen-Yu Tsai <wenst@...omium.org>
---
 drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec.c | 4 +++-
 1 file changed, 3 insertions(+), 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 5d6fdf18c3a6..e7ea632a3f94 100644
--- a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec.c
+++ b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec.c
@@ -243,9 +243,11 @@ static int mtk_vcodec_dec_get_chip_name(void *priv)
 static int vidioc_vdec_querycap(struct file *file, void *priv,
 				struct v4l2_capability *cap)
 {
+	struct mtk_vcodec_ctx *ctx = fh_to_ctx(priv);
+	struct device *dev = &ctx->dev->plat_dev->dev;
 	int platform_name = mtk_vcodec_dec_get_chip_name(priv);
 
-	strscpy(cap->driver, MTK_VCODEC_DRV_NAME, sizeof(cap->driver));
+	strscpy(cap->driver, dev->driver->name, sizeof(cap->driver));
 	strscpy(cap->card, MTK_VCODEC_DEC_NAME, sizeof(cap->card));
 	snprintf(cap->bus_info, sizeof(cap->bus_info), "platform:mt%d-dec", platform_name);
 
-- 
2.37.0.rc0.161.g10f37bed90-goog