From 078ab3ea2c3bb69cb989d52346fefa1246055e5b Mon Sep 17 00:00:00 2001 From: Sakari Ailus Date: Wed, 5 Dec 2018 12:23:54 -0500 Subject: [PATCH] media: Add a Kconfig option for the Request API The Request API is now merged to the kernel but the confidence on the stability of that API is not great, especially regarding the interaction with V4L2. Add a Kconfig option for the API, with a scary-looking warning. The patch itself disables request creation as well as does not advertise them as buffer flags. The driver requiring requests (cedrus) now depends on the Kconfig option as well. Signed-off-by: Sakari Ailus Acked-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab --- drivers/media/Kconfig | 13 +++++++++++++ drivers/media/common/videobuf2/videobuf2-v4l2.c | 2 ++ drivers/media/media-device.c | 4 ++++ drivers/staging/media/sunxi/cedrus/Kconfig | 1 + 4 files changed, 20 insertions(+) diff --git a/drivers/media/Kconfig b/drivers/media/Kconfig index 8add62a18293..102eb35fcf3f 100644 --- a/drivers/media/Kconfig +++ b/drivers/media/Kconfig @@ -110,6 +110,19 @@ config MEDIA_CONTROLLER_DVB This is currently experimental. +config MEDIA_CONTROLLER_REQUEST_API + bool "Enable Media controller Request API (EXPERIMENTAL)" + depends on MEDIA_CONTROLLER && STAGING_MEDIA + default n + ---help--- + DO NOT ENABLE THIS OPTION UNLESS YOU KNOW WHAT YOU'RE DOING. + + This option enables the Request API for the Media controller and V4L2 + interfaces. It is currently needed by a few stateless codec drivers. + + There is currently no intention to provide API or ABI stability for + this new API as of yet. + # # Video4Linux support # Only enables if one of the V4L2 types (ATV, webcam, radio) is selected diff --git a/drivers/media/common/videobuf2/videobuf2-v4l2.c b/drivers/media/common/videobuf2/videobuf2-v4l2.c index ce28bc052c3c..1d35aeabfd85 100644 --- a/drivers/media/common/videobuf2/videobuf2-v4l2.c +++ b/drivers/media/common/videobuf2/videobuf2-v4l2.c @@ -634,8 +634,10 @@ static void fill_buf_caps(struct vb2_queue *q, u32 *caps) *caps |= V4L2_BUF_CAP_SUPPORTS_USERPTR; if (q->io_modes & VB2_DMABUF) *caps |= V4L2_BUF_CAP_SUPPORTS_DMABUF; +#ifdef CONFIG_MEDIA_CONTROLLER_REQUEST_API if (q->supports_requests) *caps |= V4L2_BUF_CAP_SUPPORTS_REQUESTS; +#endif } int vb2_reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req) diff --git a/drivers/media/media-device.c b/drivers/media/media-device.c index bed24372e61f..b8ec88612df7 100644 --- a/drivers/media/media-device.c +++ b/drivers/media/media-device.c @@ -381,10 +381,14 @@ static long media_device_get_topology(struct media_device *mdev, void *arg) static long media_device_request_alloc(struct media_device *mdev, int *alloc_fd) { +#ifdef CONFIG_MEDIA_CONTROLLER_REQUEST_API if (!mdev->ops || !mdev->ops->req_validate || !mdev->ops->req_queue) return -ENOTTY; return media_request_alloc(mdev, alloc_fd); +#else + return -ENOTTY; +#endif } static long copy_arg_from_user(void *karg, void __user *uarg, unsigned int cmd) diff --git a/drivers/staging/media/sunxi/cedrus/Kconfig b/drivers/staging/media/sunxi/cedrus/Kconfig index a7a34e89c42d..3252efa422f9 100644 --- a/drivers/staging/media/sunxi/cedrus/Kconfig +++ b/drivers/staging/media/sunxi/cedrus/Kconfig @@ -3,6 +3,7 @@ config VIDEO_SUNXI_CEDRUS depends on VIDEO_DEV && VIDEO_V4L2 && MEDIA_CONTROLLER depends on HAS_DMA depends on OF + depends on MEDIA_CONTROLLER_REQUEST_API select SUNXI_SRAM select VIDEOBUF2_DMA_CONTIG select V4L2_MEM2MEM_DEV