From 2c42cdbaec56a9565a2717b450506150c9c55103 Mon Sep 17 00:00:00 2001 From: Mikhail Ulyanov Date: Wed, 22 Jul 2015 08:23:03 -0300 Subject: [media] V4L2: platform: Add Renesas R-Car JPEG codec driver Here's the driver for the Renesas R-Car JPEG processing unit. The driver is implemented within the V4L2 framework as a memory-to-memory device. It presents two video nodes to userspace, one for the encoding part, and one for the decoding part. It was found that the only working mode for encoding is no markers output, so we generate markers with software. In the current version of driver we also use software JPEG header parsing because with hardware parsing performance is lower than desired. >From a userspace point of view the process is typical (S_FMT, REQBUF, optionally QUERYBUF, QBUF, STREAMON, DQBUF) for both the source and destination queues. STREAMON can return -EINVAL in case of mismatch of output and capture queues format. Also during decoding driver can return buffers if queued buffer with JPEG image contains image with inappropriate subsampling (e.g. 4:2:0 in JPEG and 4:2:2 in capture). If JPEG image and queue format dimensions differ driver will return buffer on QBUF with VB2_BUF_STATE_ERROR flag. During encoding the available formats are: V4L2_PIX_FMT_NV12M, V4L2_PIX_FMT_NV12, V4L2_PIX_FMT_NV16, V4L2_PIX_FMT_NV16M for source and V4L2_PIX_FMT_JPEG for destination. During decoding the available formats are: V4L2_PIX_FMT_JPEG for source and V4L2_PIX_FMT_NV12M, V4L2_PIX_FMT_NV16M, V4L2_PIX_FMT_NV12, V4L2_PIX_FMT_NV16 for destination. Performance of current version: 1280x800 NV12 image encoding/decoding decoding ~122 FPS encoding ~191 FPS Signed-off-by: Mikhail Ulyanov Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab --- drivers/media/platform/Kconfig | 12 ++++++++++++ 1 file changed, 12 insertions(+) (limited to 'drivers/media/platform/Kconfig') diff --git a/drivers/media/platform/Kconfig b/drivers/media/platform/Kconfig index f6bed19..ea1cb83 100644 --- a/drivers/media/platform/Kconfig +++ b/drivers/media/platform/Kconfig @@ -231,6 +231,18 @@ config VIDEO_SH_VEU Support for the Video Engine Unit (VEU) on SuperH and SH-Mobile SoCs. +config VIDEO_RENESAS_JPU + tristate "Renesas JPEG Processing Unit" + depends on VIDEO_DEV && VIDEO_V4L2 + depends on ARCH_SHMOBILE || COMPILE_TEST + select VIDEOBUF2_DMA_CONTIG + select V4L2_MEM2MEM_DEV + ---help--- + This is a V4L2 driver for the Renesas JPEG Processing Unit. + + To compile this driver as a module, choose M here: the module + will be called rcar_jpu. + config VIDEO_RENESAS_VSP1 tristate "Renesas VSP1 Video Processing Engine" depends on VIDEO_V4L2 && VIDEO_V4L2_SUBDEV_API && HAS_DMA -- cgit v1.1