linux-kernel - [PATCH] media: hantro: Use core-generated bus

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Message-Id: <20221216132404.1173254-1-wenst@chromium.org>
Date:   Fri, 16 Dec 2022 21:24:04 +0800
From:   Chen-Yu Tsai <wenst@...omium.org>
To:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Ezequiel Garcia <ezequiel@...guardiasur.com.ar>,
        Philipp Zabel <p.zabel@...gutronix.de>
Cc:     Chen-Yu Tsai <wenst@...omium.org>, linux-media@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH] media: hantro: Use core-generated bus_info value

The Hantro driver uses a hardcoded value for the bus_info field in the
media device and |struct v4l2_capability|. This worked well when there
was just one device. However with the iMX.8 series we are now seeing
two Hantro blocks on the same chip. The static bus_info is no longer
sufficient for differentiating devices.

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 static bus_info values from the hantro driver and use the
defaults.

Signed-off-by: Chen-Yu Tsai <wenst@...omium.org>
---
 arch/arm64/boot/dts/freescale/Makefile           | 1 +
 drivers/media/platform/verisilicon/hantro_drv.c  | 2 --
 drivers/media/platform/verisilicon/hantro_v4l2.c | 2 --
 3 files changed, 1 insertion(+), 4 deletions(-)

diff --git a/arch/arm64/boot/dts/freescale/Makefile b/arch/arm64/boot/dts/freescale/Makefile
index ef6f364eaa18..ef815442c78b 100644
--- a/arch/arm64/boot/dts/freescale/Makefile
+++ b/arch/arm64/boot/dts/freescale/Makefile
@@ -55,6 +55,7 @@ dtb-$(CONFIG_ARCH_MXC) += imx8mm-data-modul-edm-sbc.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx8mm-ddr4-evk.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx8mm-emcon-avari.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx8mm-evk.dtb
+dtb-$(CONFIG_ARCH_MXC) += imx8mm-hummingboard-pulse.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx8mm-icore-mx8mm-ctouch2.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx8mm-icore-mx8mm-edimm2.2.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx8mm-innocomm-wb15-evk.dtb
diff --git a/drivers/media/platform/verisilicon/hantro_drv.c b/drivers/media/platform/verisilicon/hantro_drv.c
index 8cb4a68c9119..b0aeedae7b65 100644
--- a/drivers/media/platform/verisilicon/hantro_drv.c
+++ b/drivers/media/platform/verisilicon/hantro_drv.c
@@ -1050,8 +1050,6 @@ static int hantro_probe(struct platform_device *pdev)
 
 	vpu->mdev.dev = vpu->dev;
 	strscpy(vpu->mdev.model, DRIVER_NAME, sizeof(vpu->mdev.model));
-	strscpy(vpu->mdev.bus_info, "platform: " DRIVER_NAME,
-		sizeof(vpu->mdev.bus_info));
 	media_device_init(&vpu->mdev);
 	vpu->mdev.ops = &hantro_m2m_media_ops;
 	vpu->v4l2_dev.mdev = &vpu->mdev;
diff --git a/drivers/media/platform/verisilicon/hantro_v4l2.c b/drivers/media/platform/verisilicon/hantro_v4l2.c
index 2c7a805289e7..c1a116031013 100644
--- a/drivers/media/platform/verisilicon/hantro_v4l2.c
+++ b/drivers/media/platform/verisilicon/hantro_v4l2.c
@@ -142,8 +142,6 @@ static int vidioc_querycap(struct file *file, void *priv,
 
 	strscpy(cap->driver, vpu->dev->driver->name, sizeof(cap->driver));
 	strscpy(cap->card, vdev->name, sizeof(cap->card));
-	snprintf(cap->bus_info, sizeof(cap->bus_info), "platform: %s",
-		 vpu->dev->driver->name);
 	return 0;
 }
 
-- 
2.39.0.314.g84b9a713c41-goog