Re: [PATCH v3 2/2] media: platform: Add Aspeed Video Engine driver

Hans Verkuil
2018-09-28T11:31:07Z

On 09/25/2018 09:27 PM, Eddie James wrote:
> The Video Engine (VE) embedded in the Aspeed AST2400 and AST2500 SOCs
> can capture and compress video data from digital or analog sources. With
> the Aspeed chip acting a service processor, the Video Engine can capture
> the host processor graphics output.
>
> Add a V4L2 driver to capture video data and compress it to JPEG images.
> Make the video frames available through the V4L2 streaming interface.
>
> Signed-off-by: Eddie James <eajames@linux.ibm.com>
> ---
> MAINTAINERS | 8 +
> drivers/media/platform/Kconfig | 8 +
> drivers/media/platform/Makefile | 1 +
> drivers/media/platform/aspeed-video.c | 1645 +++++++++++++++++++++++++++++++++
> 4 files changed, 1662 insertions(+)
> create mode 100644 drivers/media/platform/aspeed-video.c
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 903d647..a9945af 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -2367,6 +2367,14 @@ S: Maintained
> F: Documentation/hwmon/asc7621
> F: drivers/hwmon/asc7621.c
>
> +ASPEED VIDEO ENGINE DRIVER
> +M: Eddie James <eajames@linux.ibm.com>
> +L: linux-media@vger.kernel.org
> +L: openbmc@lists.ozlabs.org (moderated for non-subscribers)
> +S: Maintained
> +F: drivers/media/platform/aspeed-video.c
> +F: Documentation/devicetree/bindings/media/aspeed-video.txt
> +
> ASUS NOTEBOOKS AND EEEPC ACPI/WMI EXTRAS DRIVERS
> M: Corentin Chary <corentin.chary@gmail.com>
> L: acpi4asus-user@lists.sourceforge.net
> diff --git a/drivers/media/platform/Kconfig b/drivers/media/platform/Kconfig
> index 936675d..f211253 100644
> --- a/drivers/media/platform/Kconfig
> +++ b/drivers/media/platform/Kconfig
> @@ -32,6 +32,14 @@ source "drivers/media/platform/davinci/Kconfig"
>
> source "drivers/media/platform/omap/Kconfig"
>
> +config VIDEO_ASPEED
> + tristate "Aspeed AST2400 and AST2500 Video Engine driver"
> + depends on VIDEO_V4L2
> + help
> + Support for the Aspeed Video Engine (VE) embedded in the Aspeed
> + AST2400 and AST2500 SOCs. The VE can capture and compress video data
> + from digital or analog sources.
> +
> config VIDEO_SH_VOU
> tristate "SuperH VOU video output driver"
> depends on MEDIA_CAMERA_SUPPORT
> diff --git a/drivers/media/platform/Makefile b/drivers/media/platform/Makefile
> index 6ab6200..2973953 100644
> --- a/drivers/media/platform/Makefile
> +++ b/drivers/media/platform/Makefile
> @@ -3,6 +3,7 @@
> # Makefile for the video capture/playback device drivers.
> #
>
> +obj-$(CONFIG_VIDEO_ASPEED) += aspeed-video.o
> obj-$(CONFIG_VIDEO_CADENCE) += cadence/
> obj-$(CONFIG_VIDEO_VIA_CAMERA) += via-camera.o
> obj-$(CONFIG_VIDEO_CAFE_CCIC) += marvell-ccic/
> diff --git a/drivers/media/platform/aspeed-video.c b/drivers/media/platform/aspeed-video.c
> new file mode 100644
> index 0000000..ad82cf3
> --- /dev/null
> +++ b/drivers/media/platform/aspeed-video.c
> @@ -0,0 +1,1645 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +
> +#include <linux/atomic.h>
> +#include <linux/bitfield.h>
> +#include <linux/clk.h>
> +#include <linux/delay.h>
> +#include <linux/device.h>
> +#include <linux/dma-mapping.h>
> +#include <linux/interrupt.h>
> +#include <linux/jiffies.h>
> +#include <linux/module.h>
> +#include <linux/mutex.h>
> +#include <linux/of.h>
> +#include <linux/of_irq.h>
> +#include <linux/of_reserved_mem.h>
> +#include <linux/platform_device.h>
> +#include <linux/reset.h>
> +#include <linux/sched.h>
> +#include <linux/spinlock.h>
> +#include <linux/string.h>
> +#include <linux/v4l2-controls.h>
> +#include <linux/videodev2.h>
> +#include <linux/wait.h>
> +#include <linux/workqueue.h>
> +#include <media/v4l2-ctrls.h>
> +#include <media/v4l2-dev.h>
> +#include <media/v4l2-device.h>
> +#include <media/v4l2-event.h>
> +#include <media/v4l2-ioctl.h>
> +#include <media/videobuf2-core.h>

You can drop this header

> +#include <media/videobuf2-dma-contig.h>
> +#include <media/videobuf2-v4l2.h>

and this header since videobuf2-dma-contig.h is sufficient.

> +
> +#define DEVICE_NAME "aspeed-video"
> +
> +#define ASPEED_VIDEO_JPEG_NUM_QUALITIES 12
> +#define ASPEED_VIDEO_JPEG_HEADER_SIZE 10
> +#define ASPEED_VIDEO_JPEG_QUANT_SIZE 116
> +#define ASPEED_VIDEO_JPEG_DCT_SIZE 34
> +
> +#define MAX_FRAME_RATE 60
> +#define MAX_HEIGHT 1200
> +#define MAX_WIDTH 1920
> +
> +#define NUM_POLARITY_CHECKS 10
> +#define INVALID_RESOLUTION_RETRIES 2
> +#define INVALID_RESOLUTION_DELAY msecs_to_jiffies(250)
> +#define RESOLUTION_CHANGE_DELAY msecs_to_jiffies(500)
> +#define MODE_DETECT_TIMEOUT msecs_to_jiffies(500)
> +#define STOP_TIMEOUT msecs_to_jiffies(250)
> +#define DIRECT_FETCH_THRESHOLD 0x0c0000 /* 1024 * 768 */
> +
> +#define VE_MAX_SRC_BUFFER_SIZE 0x8ca000 /* 1920 * 1200, 32bpp */
> +#define VE_JPEG_HEADER_SIZE 0x006000 /* 512 * 12 * 4 */
> +
> +#define VE_PROTECTION_KEY 0x000
> +#define VE_PROTECTION_KEY_UNLOCK 0x1a038aa8
> +
> +#define VE_SEQ_CTRL 0x004
> +#define VE_SEQ_CTRL_TRIG_MODE_DET BIT(0)
> +#define VE_SEQ_CTRL_TRIG_CAPTURE BIT(1)
> +#define VE_SEQ_CTRL_FORCE_IDLE BIT(2)
> +#define VE_SEQ_CTRL_MULT_FRAME BIT(3)
> +#define VE_SEQ_CTRL_TRIG_COMP BIT(4)
> +#define VE_SEQ_CTRL_AUTO_COMP BIT(5)
> +#define VE_SEQ_CTRL_EN_WATCHDOG BIT(7)
> +#define VE_SEQ_CTRL_YUV420 BIT(10)
> +#define VE_SEQ_CTRL_COMP_FMT GENMASK(11, 10)
> +#define VE_SEQ_CTRL_HALT BIT(12)
> +#define VE_SEQ_CTRL_EN_WATCHDOG_COMP BIT(14)
> +#define VE_SEQ_CTRL_TRIG_JPG BIT(15)
> +#define VE_SEQ_CTRL_CAP_BUSY BIT(16)
> +#define VE_SEQ_CTRL_COMP_BUSY BIT(18)
> +
> +#ifdef CONFIG_MACH_ASPEED_G5
> +#define VE_SEQ_CTRL_JPEG_MODE BIT(13) /* AST2500 */
> +#else
> +#define VE_SEQ_CTRL_JPEG_MODE BIT(8) /* AST2400 */
> +#endif /* CONFIG_MACH_ASPEED_G5 */
> +
> +#define VE_CTRL 0x008
> +#define VE_CTRL_HSYNC_POL BIT(0)
> +#define VE_CTRL_VSYNC_POL BIT(1)
> +#define VE_CTRL_SOURCE BIT(2)
> +#define VE_CTRL_INT_DE BIT(4)
> +#define VE_CTRL_DIRECT_FETCH BIT(5)
> +#define VE_CTRL_YUV BIT(6)
> +#define VE_CTRL_RGB BIT(7)
> +#define VE_CTRL_CAPTURE_FMT GENMASK(7, 6)
> +#define VE_CTRL_AUTO_OR_CURSOR BIT(8)
> +#define VE_CTRL_CLK_INVERSE BIT(11)
> +#define VE_CTRL_CLK_DELAY GENMASK(11, 9)
> +#define VE_CTRL_INTERLACE BIT(14)
> +#define VE_CTRL_HSYNC_POL_CTRL BIT(15)
> +#define VE_CTRL_FRC GENMASK(23, 16)
> +
> +#define VE_TGS_0 0x00c
> +#define VE_TGS_1 0x010
> +#define VE_TGS_FIRST GENMASK(28, 16)
> +#define VE_TGS_LAST GENMASK(12, 0)
> +
> +#define VE_SCALING_FACTOR 0x014
> +#define VE_SCALING_FILTER0 0x018
> +#define VE_SCALING_FILTER1 0x01c
> +#define VE_SCALING_FILTER2 0x020
> +#define VE_SCALING_FILTER3 0x024
> +
> +#define VE_CAP_WINDOW 0x030
> +#define VE_COMP_WINDOW 0x034
> +#define VE_COMP_PROC_OFFSET 0x038
> +#define VE_COMP_OFFSET 0x03c
> +#define VE_JPEG_ADDR 0x040
> +#define VE_SRC0_ADDR 0x044
> +#define VE_SRC_SCANLINE_OFFSET 0x048
> +#define VE_SRC1_ADDR 0x04c
> +#define VE_COMP_ADDR 0x054
> +
> +#define VE_STREAM_BUF_SIZE 0x058
> +#define VE_STREAM_BUF_SIZE_N_PACKETS GENMASK(5, 3)
> +#define VE_STREAM_BUF_SIZE_P_SIZE GENMASK(2, 0)
> +
> +#define VE_COMP_CTRL 0x060
> +#define VE_COMP_CTRL_VQ_DCT_ONLY BIT(0)
> +#define VE_COMP_CTRL_VQ_4COLOR BIT(1)
> +#define VE_COMP_CTRL_QUANTIZE BIT(2)
> +#define VE_COMP_CTRL_EN_BQ BIT(4)
> +#define VE_COMP_CTRL_EN_CRYPTO BIT(5)
> +#define VE_COMP_CTRL_DCT_CHR GENMASK(10, 6)
> +#define VE_COMP_CTRL_DCT_LUM GENMASK(15, 11)
> +#define VE_COMP_CTRL_EN_HQ BIT(16)
> +#define VE_COMP_CTRL_RSVD BIT(19)
> +#define VE_COMP_CTRL_ENCODE GENMASK(21, 20)
> +#define VE_COMP_CTRL_HQ_DCT_CHR GENMASK(26, 22)
> +#define VE_COMP_CTRL_HQ_DCT_LUM GENMASK(31, 27)
> +
> +#define VE_OFFSET_COMP_STREAM 0x078
> +
> +#define VE_SRC_LR_EDGE_DET 0x090
> +#define VE_SRC_LR_EDGE_DET_LEFT GENMASK(11, 0)
> +#define VE_SRC_LR_EDGE_DET_NO_V BIT(12)
> +#define VE_SRC_LR_EDGE_DET_NO_H BIT(13)
> +#define VE_SRC_LR_EDGE_DET_NO_DISP BIT(14)
> +#define VE_SRC_LR_EDGE_DET_NO_CLK BIT(15)
> +#define VE_SRC_LR_EDGE_DET_RT_SHF 16
> +#define VE_SRC_LR_EDGE_DET_RT GENMASK(27, VE_SRC_LR_EDGE_DET_RT_SHF)
> +#define VE_SRC_LR_EDGE_DET_INTERLACE BIT(31)
> +
> +#define VE_SRC_TB_EDGE_DET 0x094
> +#define VE_SRC_TB_EDGE_DET_TOP GENMASK(12, 0)
> +#define VE_SRC_TB_EDGE_DET_BOT_SHF 16
> +#define VE_SRC_TB_EDGE_DET_BOT GENMASK(28, VE_SRC_TB_EDGE_DET_BOT_SHF)
> +
> +#define VE_MODE_DETECT_STATUS 0x098
> +#define VE_MODE_DETECT_STATUS_VSYNC BIT(28)
> +#define VE_MODE_DETECT_STATUS_HSYNC BIT(29)
> +
> +#define VE_INTERRUPT_CTRL 0x304
> +#define VE_INTERRUPT_STATUS 0x308
> +#define VE_INTERRUPT_MODE_DETECT_WD BIT(0)
> +#define VE_INTERRUPT_CAPTURE_COMPLETE BIT(1)
> +#define VE_INTERRUPT_COMP_READY BIT(2)
> +#define VE_INTERRUPT_COMP_COMPLETE BIT(3)
> +#define VE_INTERRUPT_MODE_DETECT BIT(4)
> +#define VE_INTERRUPT_FRAME_COMPLETE BIT(5)
> +#define VE_INTERRUPT_DECODE_ERR BIT(6)
> +#define VE_INTERRUPT_HALT_READY BIT(8)
> +#define VE_INTERRUPT_HANG_WD BIT(9)
> +#define VE_INTERRUPT_STREAM_DESC BIT(10)
> +#define VE_INTERRUPT_VSYNC_DESC BIT(11)
> +
> +#define VE_MODE_DETECT 0x30c
> +#define VE_MEM_RESTRICT_START 0x310
> +#define VE_MEM_RESTRICT_END 0x314
> +
> +enum {
> + VIDEO_MODE_DETECT_DONE,
> + VIDEO_RES_CHANGE,
> + VIDEO_STREAMING,
> + VIDEO_FRAME_INPRG,
> +};
> +
> +struct aspeed_video_addr {
> + unsigned int size;
> + dma_addr_t dma;
> + void *virt;
> +};
> +
> +struct aspeed_video_buffer {
> + struct vb2_v4l2_buffer vb;
> + struct list_head link;
> +};
> +
> +#define to_aspeed_video_buffer(x) \
> + container_of((x), struct aspeed_video_buffer, vb)
> +
> +struct aspeed_video {
> + void __iomem *base;
> + struct clk *eclk;
> + struct clk *vclk;
> + struct reset_control *rst;
> +
> + struct device *dev;
> + struct v4l2_ctrl_handler ctrl_handler;
> + struct v4l2_device v4l2_dev;
> + struct v4l2_pix_format v4l2_fmt;

Nitpick: I'd rename v4l2_fmt to pix_fmt. v4l2_fmt suggests that it is a v4l2_format
struct, which it no longer is.

> + struct vb2_queue queue;
> + struct video_device vdev;
> + struct mutex video_lock;
> +
> + atomic_t clients;
> + wait_queue_head_t wait;
> + spinlock_t lock;
> + struct delayed_work res_work;
> + struct list_head buffers;
> + unsigned long flags;
> + unsigned int sequence;
> +
> + unsigned int max_compressed_size;
> + struct aspeed_video_addr srcs[2];
> + struct aspeed_video_addr jpeg;
> +
> + bool yuv420;
> + unsigned int frame_rate;
> + unsigned int jpeg_quality;
> + unsigned int height;
> + unsigned int width;
> +};
> +
> +#define to_aspeed_video(x) container_of((x), struct aspeed_video, v4l2_dev)
> +
> +static const u32 aspeed_video_jpeg_header[ASPEED_VIDEO_JPEG_HEADER_SIZE] = {
> + 0xE0FFD8FF, 0x464A1000, 0x01004649, 0x60000101, 0x00006000, 0x0F00FEFF,
> + 0x00002D05, 0x00000000, 0x00000000, 0x00DBFF00
> +};
> +
> +static const u32 aspeed_video_jpeg_quant[ASPEED_VIDEO_JPEG_QUANT_SIZE] = {
> + 0x081100C0, 0x00000000, 0x00110103, 0x03011102, 0xC4FF0111, 0x00001F00,
> + 0x01010501, 0x01010101, 0x00000000, 0x00000000, 0x04030201, 0x08070605,
> + 0xFF0B0A09, 0x10B500C4, 0x03010200, 0x03040203, 0x04040505, 0x7D010000,
> + 0x00030201, 0x12051104, 0x06413121, 0x07615113, 0x32147122, 0x08A19181,
> + 0xC1B14223, 0xF0D15215, 0x72623324, 0x160A0982, 0x1A191817, 0x28272625,
> + 0x35342A29, 0x39383736, 0x4544433A, 0x49484746, 0x5554534A, 0x59585756,
> + 0x6564635A, 0x69686766, 0x7574736A, 0x79787776, 0x8584837A, 0x89888786,
> + 0x9493928A, 0x98979695, 0xA3A29A99, 0xA7A6A5A4, 0xB2AAA9A8, 0xB6B5B4B3,
> + 0xBAB9B8B7, 0xC5C4C3C2, 0xC9C8C7C6, 0xD4D3D2CA, 0xD8D7D6D5, 0xE2E1DAD9,
> + 0xE6E5E4E3, 0xEAE9E8E7, 0xF4F3F2F1, 0xF8F7F6F5, 0xC4FFFAF9, 0x00011F00,
> + 0x01010103, 0x01010101, 0x00000101, 0x00000000, 0x04030201, 0x08070605,
> + 0xFF0B0A09, 0x11B500C4, 0x02010200, 0x04030404, 0x04040507, 0x77020100,
> + 0x03020100, 0x21050411, 0x41120631, 0x71610751, 0x81322213, 0x91421408,
> + 0x09C1B1A1, 0xF0523323, 0xD1726215, 0x3424160A, 0x17F125E1, 0x261A1918,
> + 0x2A292827, 0x38373635, 0x44433A39, 0x48474645, 0x54534A49, 0x58575655,
> + 0x64635A59, 0x68676665, 0x74736A69, 0x78777675, 0x83827A79, 0x87868584,
> + 0x928A8988, 0x96959493, 0x9A999897, 0xA5A4A3A2, 0xA9A8A7A6, 0xB4B3B2AA,
> + 0xB8B7B6B5, 0xC3C2BAB9, 0xC7C6C5C4, 0xD2CAC9C8, 0xD6D5D4D3, 0xDAD9D8D7,
> + 0xE5E4E3E2, 0xE9E8E7E6, 0xF4F3F2EA, 0xF8F7F6F5, 0xDAFFFAF9, 0x01030C00,
> + 0x03110200, 0x003F0011
> +};
> +
> +static const u32 aspeed_video_jpeg_dct[ASPEED_VIDEO_JPEG_NUM_QUALITIES]
> + [ASPEED_VIDEO_JPEG_DCT_SIZE] = {
> + { 0x0D140043, 0x0C0F110F, 0x11101114, 0x17141516, 0x1E20321E,
> + 0x3D1E1B1B, 0x32242E2B, 0x4B4C3F48, 0x44463F47, 0x61735A50,
> + 0x566C5550, 0x88644644, 0x7A766C65, 0x4D808280, 0x8C978D60,
> + 0x7E73967D, 0xDBFF7B80, 0x1F014300, 0x272D2121, 0x3030582D,
> + 0x697BB958, 0xB8B9B97B, 0xB9B8A6A6, 0xB9B9B9B9, 0xB9B9B9B9,
> + 0xB9B9B9B9, 0xB9B9B9B9, 0xB9B9B9B9, 0xB9B9B9B9, 0xB9B9B9B9,
> + 0xB9B9B9B9, 0xB9B9B9B9, 0xB9B9B9B9, 0xFFB9B9B9 },
> + { 0x0C110043, 0x0A0D0F0D, 0x0F0E0F11, 0x14111213, 0x1A1C2B1A,
> + 0x351A1818, 0x2B1F2826, 0x4142373F, 0x3C3D373E, 0x55644E46,
> + 0x4B5F4A46, 0x77573D3C, 0x6B675F58, 0x43707170, 0x7A847B54,
> + 0x6E64836D, 0xDBFF6C70, 0x1B014300, 0x22271D1D, 0x2A2A4C27,
> + 0x5B6BA04C, 0xA0A0A06B, 0xA0A0A0A0, 0xA0A0A0A0, 0xA0A0A0A0,
> + 0xA0A0A0A0, 0xA0A0A0A0, 0xA0A0A0A0, 0xA0A0A0A0, 0xA0A0A0A0,
> + 0xA0A0A0A0, 0xA0A0A0A0, 0xA0A0A0A0, 0xFFA0A0A0 },
> + { 0x090E0043, 0x090A0C0A, 0x0C0B0C0E, 0x110E0F10, 0x15172415,
> + 0x2C151313, 0x241A211F, 0x36372E34, 0x31322E33, 0x4653413A,
> + 0x3E4E3D3A, 0x62483231, 0x58564E49, 0x385D5E5D, 0x656D6645,
> + 0x5B536C5A, 0xDBFF595D, 0x16014300, 0x1C201818, 0x22223F20,
> + 0x4B58853F, 0x85858558, 0x85858585, 0x85858585, 0x85858585,
> + 0x85858585, 0x85858585, 0x85858585, 0x85858585, 0x85858585,
> + 0x85858585, 0x85858585, 0x85858585, 0xFF858585 },
> + { 0x070B0043, 0x07080A08, 0x0A090A0B, 0x0D0B0C0C, 0x11121C11,
> + 0x23110F0F, 0x1C141A19, 0x2B2B2429, 0x27282428, 0x3842332E,
> + 0x313E302E, 0x4E392827, 0x46443E3A, 0x2C4A4A4A, 0x50565137,
> + 0x48425647, 0xDBFF474A, 0x12014300, 0x161A1313, 0x1C1C331A,
> + 0x3D486C33, 0x6C6C6C48, 0x6C6C6C6C, 0x6C6C6C6C, 0x6C6C6C6C,
> + 0x6C6C6C6C, 0x6C6C6C6C, 0x6C6C6C6C, 0x6C6C6C6C, 0x6C6C6C6C,
> + 0x6C6C6C6C, 0x6C6C6C6C, 0x6C6C6C6C, 0xFF6C6C6C },
> + { 0x06090043, 0x05060706, 0x07070709, 0x0A09090A, 0x0D0E160D,
> + 0x1B0D0C0C, 0x16101413, 0x21221C20, 0x1E1F1C20, 0x2B332824,
> + 0x26302624, 0x3D2D1F1E, 0x3735302D, 0x22393A39, 0x3F443F2B,
> + 0x38334338, 0xDBFF3739, 0x0D014300, 0x11130E0E, 0x15152613,
> + 0x2D355026, 0x50505035, 0x50505050, 0x50505050, 0x50505050,
> + 0x50505050, 0x50505050, 0x50505050, 0x50505050, 0x50505050,
> + 0x50505050, 0x50505050, 0x50505050, 0xFF505050 },
> + { 0x04060043, 0x03040504, 0x05040506, 0x07060606, 0x09090F09,
> + 0x12090808, 0x0F0A0D0D, 0x16161315, 0x14151315, 0x1D221B18,
> + 0x19201918, 0x281E1514, 0x2423201E, 0x17262726, 0x2A2D2A1C,
> + 0x25222D25, 0xDBFF2526, 0x09014300, 0x0B0D0A0A, 0x0E0E1A0D,
> + 0x1F25371A, 0x37373725, 0x37373737, 0x37373737, 0x37373737,
> + 0x37373737, 0x37373737, 0x37373737, 0x37373737, 0x37373737,
> + 0x37373737, 0x37373737, 0x37373737, 0xFF373737 },
> + { 0x02030043, 0x01020202, 0x02020203, 0x03030303, 0x04040704,
> + 0x09040404, 0x07050606, 0x0B0B090A, 0x0A0A090A, 0x0E110D0C,
> + 0x0C100C0C, 0x140F0A0A, 0x1211100F, 0x0B131313, 0x1516150E,
> + 0x12111612, 0xDBFF1213, 0x04014300, 0x05060505, 0x07070D06,
> + 0x0F121B0D, 0x1B1B1B12, 0x1B1B1B1B, 0x1B1B1B1B, 0x1B1B1B1B,
> + 0x1B1B1B1B, 0x1B1B1B1B, 0x1B1B1B1B, 0x1B1B1B1B, 0x1B1B1B1B,
> + 0x1B1B1B1B, 0x1B1B1B1B, 0x1B1B1B1B, 0xFF1B1B1B },
> + { 0x01020043, 0x01010101, 0x01010102, 0x02020202, 0x03030503,
> + 0x06030202, 0x05030404, 0x07070607, 0x06070607, 0x090B0908,
> + 0x080A0808, 0x0D0A0706, 0x0C0B0A0A, 0x070C0D0C, 0x0E0F0E09,
> + 0x0C0B0F0C, 0xDBFF0C0C, 0x03014300, 0x03040303, 0x04040804,
> + 0x0A0C1208, 0x1212120C, 0x12121212, 0x12121212, 0x12121212,
> + 0x12121212, 0x12121212, 0x12121212, 0x12121212, 0x12121212,
> + 0x12121212, 0x12121212, 0x12121212, 0xFF121212 },
> + { 0x01020043, 0x01010101, 0x01010102, 0x02020202, 0x03030503,
> + 0x06030202, 0x05030404, 0x07070607, 0x06070607, 0x090B0908,
> + 0x080A0808, 0x0D0A0706, 0x0C0B0A0A, 0x070C0D0C, 0x0E0F0E09,
> + 0x0C0B0F0C, 0xDBFF0C0C, 0x02014300, 0x03030202, 0x04040703,
> + 0x080A0F07, 0x0F0F0F0A, 0x0F0F0F0F, 0x0F0F0F0F, 0x0F0F0F0F,
> + 0x0F0F0F0F, 0x0F0F0F0F, 0x0F0F0F0F, 0x0F0F0F0F, 0x0F0F0F0F,
> + 0x0F0F0F0F, 0x0F0F0F0F, 0x0F0F0F0F, 0xFF0F0F0F },
> + { 0x01010043, 0x01010101, 0x01010101, 0x01010101, 0x02020302,
> + 0x04020202, 0x03020303, 0x05050405, 0x05050405, 0x07080606,
> + 0x06080606, 0x0A070505, 0x09080807, 0x05090909, 0x0A0B0A07,
> + 0x09080B09, 0xDBFF0909, 0x02014300, 0x02030202, 0x03030503,
> + 0x07080C05, 0x0C0C0C08, 0x0C0C0C0C, 0x0C0C0C0C, 0x0C0C0C0C,
> + 0x0C0C0C0C, 0x0C0C0C0C, 0x0C0C0C0C, 0x0C0C0C0C, 0x0C0C0C0C,
> + 0x0C0C0C0C, 0x0C0C0C0C, 0x0C0C0C0C, 0xFF0C0C0C },
> + { 0x01010043, 0x01010101, 0x01010101, 0x01010101, 0x01010201,
> + 0x03010101, 0x02010202, 0x03030303, 0x03030303, 0x04050404,
> + 0x04050404, 0x06050303, 0x06050505, 0x03060606, 0x07070704,
> + 0x06050706, 0xDBFF0606, 0x01014300, 0x01020101, 0x02020402,
> + 0x05060904, 0x09090906, 0x09090909, 0x09090909, 0x09090909,
> + 0x09090909, 0x09090909, 0x09090909, 0x09090909, 0x09090909,
> + 0x09090909, 0x09090909, 0x09090909, 0xFF090909 },
> + { 0x01010043, 0x01010101, 0x01010101, 0x01010101, 0x01010101,
> + 0x01010101, 0x01010101, 0x01010101, 0x01010101, 0x02020202,
> + 0x02020202, 0x03020101, 0x03020202, 0x01030303, 0x03030302,
> + 0x03020303, 0xDBFF0403, 0x01014300, 0x01010101, 0x01010201,
> + 0x03040602, 0x06060604, 0x06060606, 0x06060606, 0x06060606,
> + 0x06060606, 0x06060606, 0x06060606, 0x06060606, 0x06060606,
> + 0x06060606, 0x06060606, 0x06060606, 0xFF060606 }
> +};

Please lower case the A-F values in these arrays.

> +
> +static void aspeed_video_init_jpeg_table(u32 *table, bool yuv420)
> +{
> + int i;
> + unsigned int base;
> +
> + for (i = 0; i < ASPEED_VIDEO_JPEG_NUM_QUALITIES; i++) {
> + base = 256 * i; /* AST HW requires this header spacing */
> + memcpy(&table[base], aspeed_video_jpeg_header,
> + sizeof(aspeed_video_jpeg_header));
> +
> + base += ASPEED_VIDEO_JPEG_HEADER_SIZE;
> + memcpy(&table[base], aspeed_video_jpeg_dct[i],
> + sizeof(aspeed_video_jpeg_dct[i]));
> +
> + base += ASPEED_VIDEO_JPEG_DCT_SIZE;
> + memcpy(&table[base], aspeed_video_jpeg_quant,
> + sizeof(aspeed_video_jpeg_quant));
> +
> + if (yuv420)
> + table[base + 2] = 0x00220103;
> + }
> +}
> +
> +static void aspeed_video_update(struct aspeed_video *video, u32 reg,
> + unsigned long mask, u32 bits)

You probably want to use u32 for the mask.

> +{
> + u32 t = readl(video->base + reg);
> + u32 before = t;
> +
> + t &= mask;
> + t |= bits;
> + writel(t, video->base + reg);
> + dev_dbg(video->dev, "update %03x[%08x -> %08x]\n", reg, before,
> + readl(video->base + reg));
> +}
> +
> +static u32 aspeed_video_read(struct aspeed_video *video, u32 reg)
> +{
> + u32 t = readl(video->base + reg);
> +
> + dev_dbg(video->dev, "read %03x[%08x]\n", reg, t);
> + return t;
> +}
> +
> +static void aspeed_video_write(struct aspeed_video *video, u32 reg, u32 val)
> +{
> + writel(val, video->base + reg);
> + dev_dbg(video->dev, "write %03x[%08x]\n", reg,
> + readl(video->base + reg));
> +}
> +
> +static bool aspeed_video_engine_busy(struct aspeed_video *video)
> +{
> + u32 seq_ctrl = aspeed_video_read(video, VE_SEQ_CTRL);
> +
> + if (!(seq_ctrl & VE_SEQ_CTRL_COMP_BUSY) ||
> + !(seq_ctrl & VE_SEQ_CTRL_CAP_BUSY)) {
> + dev_info(video->dev, "video engine busy\n");

Would dev_dbg be better to avoid spamming the kernel log?

> + return true;
> + }
> +
> + return false;
> +}
> +
> +static int aspeed_video_start_frame(struct aspeed_video *video)
> +{
> + dma_addr_t addr;
> + unsigned long flags;
> + struct aspeed_video_buffer *buf;
> +
> + if (aspeed_video_engine_busy(video))
> + return -EBUSY;
> +
> + spin_lock_irqsave(&video->lock, flags);
> + buf = list_first_entry_or_null(&video->buffers,
> + struct aspeed_video_buffer, link);
> + if (!buf) {
> + spin_unlock_irqrestore(&video->lock, flags);
> + return -EPROTO;
> + }
> +
> + set_bit(VIDEO_FRAME_INPRG, &video->flags);
> + addr = vb2_dma_contig_plane_dma_addr(&buf->vb.vb2_buf, 0);
> + spin_unlock_irqrestore(&video->lock, flags);
> +
> + aspeed_video_write(video, VE_COMP_PROC_OFFSET, 0);
> + aspeed_video_write(video, VE_COMP_OFFSET, 0);
> + aspeed_video_write(video, VE_COMP_ADDR, addr);
> +
> + aspeed_video_update(video, VE_INTERRUPT_CTRL, 0xffffffff,
> + VE_INTERRUPT_COMP_COMPLETE |
> + VE_INTERRUPT_CAPTURE_COMPLETE);
> +
> + aspeed_video_update(video, VE_SEQ_CTRL, 0xffffffff,
> + VE_SEQ_CTRL_TRIG_CAPTURE | VE_SEQ_CTRL_TRIG_COMP);
> +
> + return 0;
> +}
> +
> +static void aspeed_video_start_mode_detect(struct aspeed_video *video)
> +{
> + /* Enable mode detect interrupts */
> + aspeed_video_update(video, VE_INTERRUPT_CTRL, 0xffffffff,
> + VE_INTERRUPT_MODE_DETECT);
> +
> + /* Trigger mode detect */
> + aspeed_video_update(video, VE_SEQ_CTRL, 0xffffffff,
> + VE_SEQ_CTRL_TRIG_MODE_DET);
> +}
> +
> +static void aspeed_video_disable_mode_detect(struct aspeed_video *video)
> +{
> + /* Disable mode detect interrupts */
> + aspeed_video_update(video, VE_INTERRUPT_CTRL,
> + ~VE_INTERRUPT_MODE_DETECT, 0);
> +
> + /* Disable mode detect */
> + aspeed_video_update(video, VE_SEQ_CTRL, ~VE_SEQ_CTRL_TRIG_MODE_DET, 0);
> +}
> +
> +static void aspeed_video_off(struct aspeed_video *video)
> +{
> + /* Reset the engine */
> + reset_control_assert(video->rst);
> + udelay(100);
> + reset_control_deassert(video->rst);
> +
> + /* Turn off the relevant clocks */
> + clk_disable_unprepare(video->vclk);
> + clk_disable_unprepare(video->eclk);
> +}
> +
> +static void aspeed_video_on(struct aspeed_video *video)
> +{
> + /* Turn on the relevant clocks */
> + clk_prepare_enable(video->eclk);
> + clk_prepare_enable(video->vclk);
> +
> + /* Reset the engine */
> + reset_control_assert(video->rst);
> + udelay(100);
> + reset_control_deassert(video->rst);
> +}
> +
> +static void aspeed_video_buf_err(struct aspeed_video *video)
> +{
> + unsigned long flags;
> + struct aspeed_video_buffer *buf;
> +
> + spin_lock_irqsave(&video->lock, flags);
> + list_for_each_entry(buf, &video->buffers, link) {
> + if (list_is_last(&buf->link, &video->buffers))
> + buf->vb.flags |= V4L2_BUF_FLAG_LAST;

There is no need to set the LAST flag. That's meant for MPEG/H264/etc codecs
and it is not needed for MJPEG.

> + vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);

See my comment in start_streaming: VB2_BUF_STATE_ERROR should be an argument to
this function.

> + }
> + INIT_LIST_HEAD(&video->buffers);
> + spin_unlock_irqrestore(&video->lock, flags);
> +}
> +
> +static irqreturn_t aspeed_video_irq(int irq, void *arg)
> +{
> + struct aspeed_video *video = arg;
> + u32 sts = aspeed_video_read(video, VE_INTERRUPT_STATUS);
> +
> + if (atomic_read(&video->clients) == 0) {
> + dev_info(video->dev, "irq with no client; disabling irqs\n");
> +
> + aspeed_video_write(video, VE_INTERRUPT_CTRL, 0);
> + aspeed_video_write(video, VE_INTERRUPT_STATUS, 0xffffffff);
> + return IRQ_HANDLED;
> + }
> +
> + /* Resolution changed; reset entire engine and reinitialize */
> + if (sts & VE_INTERRUPT_MODE_DETECT_WD) {
> + dev_info(video->dev, "resolution changed; resetting\n");
> + set_bit(VIDEO_RES_CHANGE, &video->flags);
> + clear_bit(VIDEO_FRAME_INPRG, &video->flags);
> +
> + aspeed_video_off(video);
> + aspeed_video_buf_err(video);
> +
> + schedule_delayed_work(&video->res_work,
> + RESOLUTION_CHANGE_DELAY);
> + return IRQ_HANDLED;
> + }
> +
> + if (sts & VE_INTERRUPT_MODE_DETECT) {
> + aspeed_video_update(video, VE_INTERRUPT_CTRL,
> + ~VE_INTERRUPT_MODE_DETECT, 0);
> + aspeed_video_write(video, VE_INTERRUPT_STATUS,
> + VE_INTERRUPT_MODE_DETECT);
> +
> + set_bit(VIDEO_MODE_DETECT_DONE, &video->flags);
> + wake_up_interruptible_all(&video->wait);
> + }
> +
> + if ((sts & VE_INTERRUPT_COMP_COMPLETE) &&
> + (sts & VE_INTERRUPT_CAPTURE_COMPLETE)) {
> + struct aspeed_video_buffer *buf;
> + u32 frame_size = aspeed_video_read(video,
> + VE_OFFSET_COMP_STREAM);
> +
> + spin_lock(&video->lock);
> + clear_bit(VIDEO_FRAME_INPRG, &video->flags);
> + buf = list_first_entry_or_null(&video->buffers,
> + struct aspeed_video_buffer,
> + link);
> + if (buf) {
> + vb2_set_plane_payload(&buf->vb.vb2_buf, 0, frame_size);
> +
> + if (!list_is_last(&buf->link, &video->buffers)) {
> + buf->vb.vb2_buf.timestamp = ktime_get_ns();
> + buf->vb.sequence = video->sequence++;
> + buf->vb.field = V4L2_FIELD_NONE;
> + vb2_buffer_done(&buf->vb.vb2_buf,
> + VB2_BUF_STATE_DONE);
> + list_del(&buf->link);
> + }
> + }
> + spin_unlock(&video->lock);
> +
> + aspeed_video_update(video, VE_SEQ_CTRL,
> + ~(VE_SEQ_CTRL_TRIG_CAPTURE |
> + VE_SEQ_CTRL_FORCE_IDLE |
> + VE_SEQ_CTRL_TRIG_COMP), 0);
> + aspeed_video_update(video, VE_INTERRUPT_CTRL,
> + ~(VE_INTERRUPT_COMP_COMPLETE |
> + VE_INTERRUPT_CAPTURE_COMPLETE), 0);
> + aspeed_video_write(video, VE_INTERRUPT_STATUS,
> + VE_INTERRUPT_COMP_COMPLETE |
> + VE_INTERRUPT_CAPTURE_COMPLETE);
> +
> + if (test_bit(VIDEO_STREAMING, &video->flags) && buf)
> + aspeed_video_start_frame(video);
> + }
> +
> + return IRQ_HANDLED;
> +}
> +
> +static void aspeed_video_check_polarity(struct aspeed_video *video)
> +{
> + int i;
> + int hsync_counter = 0;
> + int vsync_counter = 0;
> + u32 sts;
> +
> + for (i = 0; i < NUM_POLARITY_CHECKS; ++i) {
> + sts = aspeed_video_read(video, VE_MODE_DETECT_STATUS);
> + if (sts & VE_MODE_DETECT_STATUS_VSYNC)
> + vsync_counter--;
> + else
> + vsync_counter++;
> +
> + if (sts & VE_MODE_DETECT_STATUS_HSYNC)
> + hsync_counter--;
> + else
> + hsync_counter++;
> + }
> +
> + if (hsync_counter < 0 || vsync_counter < 0) {
> + u32 ctrl;
> +
> + if (hsync_counter < 0)
> + ctrl = VE_CTRL_HSYNC_POL;
> +
> + if (vsync_counter < 0)
> + ctrl = VE_CTRL_VSYNC_POL;
> +
> + aspeed_video_update(video, VE_CTRL, 0xffffffff, ctrl);
> + }

If you can read this information, then it would be nice to return it
in QUERY_DV_TIMINGS.

> +}
> +
> +static bool aspeed_video_alloc_buf(struct aspeed_video *video,
> + struct aspeed_video_addr *addr,
> + unsigned int size)
> +{
> + addr->virt = dma_alloc_coherent(video->dev, size, &addr->dma,
> + GFP_KERNEL);
> + if (!addr->virt)
> + return false;
> +
> + addr->size = size;
> + return true;
> +}
> +
> +static void aspeed_video_free_buf(struct aspeed_video *video,
> + struct aspeed_video_addr *addr)
> +{
> + dma_free_coherent(video->dev, addr->size, addr->virt, addr->dma);
> + addr->size = 0;
> + addr->dma = 0ULL;
> + addr->virt = NULL;
> +}
> +
> +/*
> + * Get the minimum HW-supported compression buffer size for the frame size.
> + * Assume worst-case JPEG compression size is 1/8 raw size. This should be
> + * plenty even for maximum quality; any worse and the engine will simply return
> + * incomplete JPEGs.
> + */

Ah, nice that you could figure out how the compression algorithm worked.

> +static void aspeed_video_calc_compressed_size(struct aspeed_video *video)
> +{
> + int i, j;
> + u32 compression_buffer_size_reg = 0;
> + unsigned int size;
> + const unsigned int num_compression_packets = 4;
> + const unsigned int compression_packet_size = 1024;
> + const unsigned int max_compressed_size =
> + video->width * video->height / 2; /* 4 Bpp / 8 */
> +
> + video->max_compressed_size = UINT_MAX;
> +
> + for (i = 0; i < 6; ++i) {
> + for (j = 0; j < 8; ++j) {
> + size = (num_compression_packets << i) *
> + (compression_packet_size << j);
> + if (size < max_compressed_size)
> + continue;
> +
> + if (size < video->max_compressed_size) {
> + compression_buffer_size_reg = (i << 3) | j;
> + video->max_compressed_size = size;
> + }
> + }
> + }
> +
> + aspeed_video_write(video, VE_STREAM_BUF_SIZE,
> + compression_buffer_size_reg);
> +
> + dev_dbg(video->dev, "max compressed size: %x\n",
> + video->max_compressed_size);
> +}
> +
> +#define res_check(v) test_and_clear_bit(VIDEO_MODE_DETECT_DONE, &(v)->flags)
> +
> +static int aspeed_video_get_resolution(struct aspeed_video *video)
> +{
> + bool invalid_resolution = true;
> + int rc;
> + int tries = 0;
> + unsigned int bottom;
> + unsigned int left;
> + unsigned int right;
> + unsigned int size;
> + unsigned int top;
> + u32 src_lr_edge;
> + u32 src_tb_edge;
> + struct aspeed_video_addr src;
> +
> + if (video->srcs[1].size)
> + aspeed_video_free_buf(video, &video->srcs[1]);
> +
> + if (video->srcs[0].size >= VE_MAX_SRC_BUFFER_SIZE) {
> + src = video->srcs[0];
> + } else {
> + if (video->srcs[0].size)
> + aspeed_video_free_buf(video, &video->srcs[0]);
> +
> + if (!aspeed_video_alloc_buf(video, &src,
> + VE_MAX_SRC_BUFFER_SIZE))
> + goto err_mem;
> + }
> +
> + aspeed_video_write(video, VE_SRC0_ADDR, src.dma);
> +
> + video->width = 0;
> + video->height = 0;
> +
> + do {
> + if (tries) {
> + set_current_state(TASK_INTERRUPTIBLE);
> + if (schedule_timeout(INVALID_RESOLUTION_DELAY))
> + return -EINTR;
> + }
> +
> + aspeed_video_start_mode_detect(video);
> +
> + rc = wait_event_interruptible_timeout(video->wait,
> + res_check(video),
> + MODE_DETECT_TIMEOUT);
> + if (!rc) {
> + dev_err(video->dev, "timed out on 1st mode detect\n");
> + aspeed_video_disable_mode_detect(video);
> + return -ETIME;

That should be ETIMEDOUT.

> + }
> +
> + /* Disable mode detect in order to re-trigger */
> + aspeed_video_update(video, VE_SEQ_CTRL,
> + ~VE_SEQ_CTRL_TRIG_MODE_DET, 0);
> +
> + aspeed_video_check_polarity(video);
> +
> + aspeed_video_start_mode_detect(video);
> +
> + rc = wait_event_interruptible_timeout(video->wait,
> + res_check(video),
> + MODE_DETECT_TIMEOUT);
> + if (!rc) {
> + dev_err(video->dev, "timed out on 2nd mode detect\n");
> + aspeed_video_disable_mode_detect(video);
> + return -ETIME;

Ditto.

> + }
> +
> + src_lr_edge = aspeed_video_read(video, VE_SRC_LR_EDGE_DET);
> + src_tb_edge = aspeed_video_read(video, VE_SRC_TB_EDGE_DET);
> +
> + bottom = (src_tb_edge & VE_SRC_TB_EDGE_DET_BOT) >>
> + VE_SRC_TB_EDGE_DET_BOT_SHF;
> + top = src_tb_edge & VE_SRC_TB_EDGE_DET_TOP;
> + if (top > bottom)
> + continue;
> +
> + right = (src_lr_edge & VE_SRC_LR_EDGE_DET_RT) >>
> + VE_SRC_LR_EDGE_DET_RT_SHF;
> + left = src_lr_edge & VE_SRC_LR_EDGE_DET_LEFT;
> + if (left > right)
> + continue;
> +
> + invalid_resolution = false;
> + } while (invalid_resolution && (tries++ < INVALID_RESOLUTION_RETRIES));
> +
> + if (invalid_resolution) {
> + dev_err(video->dev, "invalid resolution detected\n");
> + return -EMSGSIZE;

Hmm, weird error.

Check https://hverkuil.home.xs4all.nl/spec/uapi/v4l/vidioc-query-dv-timings.html
for common error codes that relate to this.

Note that ENUMINPUT also returns status information.

> + }
> +
> + video->height = (bottom - top) + 1;
> + video->width = (right - left) + 1;
> + size = video->height * video->width;

It looks like you can actually determine the blanking width/height and
possibly even more detailed information that would be very useful to
show with the DV_TIMINGS ioctls.

> +
> + /* Don't use direct mode below 1024 x 768 (irqs don't fire) */
> + if (size < DIRECT_FETCH_THRESHOLD) {
> + aspeed_video_write(video, VE_TGS_0,
> + FIELD_PREP(VE_TGS_FIRST, left - 1) |
> + FIELD_PREP(VE_TGS_LAST, right));
> + aspeed_video_write(video, VE_TGS_1,
> + FIELD_PREP(VE_TGS_FIRST, top) |
> + FIELD_PREP(VE_TGS_LAST, bottom + 1));
> + aspeed_video_update(video, VE_CTRL, 0xffffffff,
> + VE_CTRL_INT_DE);
> + } else {
> + aspeed_video_update(video, VE_CTRL, 0xffffffff,
> + VE_CTRL_DIRECT_FETCH);
> + }
> +
> + aspeed_video_write(video, VE_CAP_WINDOW,
> + video->width << 16 | video->height);
> + aspeed_video_write(video, VE_COMP_WINDOW,
> + video->width << 16 | video->height);
> + aspeed_video_write(video, VE_SRC_SCANLINE_OFFSET, video->width * 4);
> +
> + aspeed_video_update(video, VE_INTERRUPT_CTRL, 0xffffffff,
> + VE_INTERRUPT_MODE_DETECT_WD);
> + aspeed_video_update(video, VE_SEQ_CTRL, 0xffffffff,
> + VE_SEQ_CTRL_AUTO_COMP | VE_SEQ_CTRL_EN_WATCHDOG);
> +
> + dev_dbg(video->dev, "got resolution[%dx%d]\n", video->width,
> + video->height);
> +
> + size *= 4;
> + if (size == src.size / 2) {
> + aspeed_video_write(video, VE_SRC1_ADDR, src.dma + size);
> + video->srcs[0] = src;
> + } else if (size == src.size) {
> + video->srcs[0] = src;
> +
> + if (!aspeed_video_alloc_buf(video, &video->srcs[1], size))
> + goto err_mem;
> +
> + aspeed_video_write(video, VE_SRC1_ADDR, video->srcs[1].dma);
> + } else {
> + aspeed_video_free_buf(video, &src);
> +
> + if (!aspeed_video_alloc_buf(video, &video->srcs[0], size))
> + goto err_mem;
> +
> + if (!aspeed_video_alloc_buf(video, &video->srcs[1], size))
> + goto err_mem;
> +
> + aspeed_video_write(video, VE_SRC0_ADDR, video->srcs[0].dma);
> + aspeed_video_write(video, VE_SRC1_ADDR, video->srcs[1].dma);
> + }
> +
> + aspeed_video_calc_compressed_size(video);
> +
> + return 0;
> +
> +err_mem:
> + dev_err(video->dev, "failed to allocate source buffers\n");
> +
> + if (video->srcs[0].size)
> + aspeed_video_free_buf(video, &video->srcs[0]);
> +
> + return -ENOMEM;
> +}
> +
> +static void aspeed_video_init_regs(struct aspeed_video *video)
> +{
> + u32 comp_ctrl = VE_COMP_CTRL_RSVD |
> + FIELD_PREP(VE_COMP_CTRL_DCT_LUM, video->jpeg_quality) |
> + FIELD_PREP(VE_COMP_CTRL_DCT_CHR, video->jpeg_quality | 0x10);
> + u32 ctrl = VE_CTRL_AUTO_OR_CURSOR;
> + u32 seq_ctrl = VE_SEQ_CTRL_JPEG_MODE;
> +
> + if (video->frame_rate)
> + ctrl |= FIELD_PREP(VE_CTRL_FRC, video->frame_rate);
> +
> + if (video->yuv420)
> + seq_ctrl |= VE_SEQ_CTRL_YUV420;
> +
> + /* Unlock VE registers */
> + aspeed_video_write(video, VE_PROTECTION_KEY, VE_PROTECTION_KEY_UNLOCK);
> +
> + /* Disable interrupts */
> + aspeed_video_write(video, VE_INTERRUPT_CTRL, 0);
> + aspeed_video_write(video, VE_INTERRUPT_STATUS, 0xffffffff);
> +
> + /* Clear the offset */
> + aspeed_video_write(video, VE_COMP_PROC_OFFSET, 0);
> + aspeed_video_write(video, VE_COMP_OFFSET, 0);
> +
> + aspeed_video_write(video, VE_JPEG_ADDR, video->jpeg.dma);
> +
> + /* Set control registers */
> + aspeed_video_write(video, VE_SEQ_CTRL, seq_ctrl);
> + aspeed_video_write(video, VE_CTRL, ctrl);
> + aspeed_video_write(video, VE_COMP_CTRL, comp_ctrl);
> +
> + /* Don't downscale */
> + aspeed_video_write(video, VE_SCALING_FACTOR, 0x10001000);
> + aspeed_video_write(video, VE_SCALING_FILTER0, 0x00200000);
> + aspeed_video_write(video, VE_SCALING_FILTER1, 0x00200000);
> + aspeed_video_write(video, VE_SCALING_FILTER2, 0x00200000);
> + aspeed_video_write(video, VE_SCALING_FILTER3, 0x00200000);
> +
> + /* Set mode detection defaults */
> + aspeed_video_write(video, VE_MODE_DETECT, 0x22666500);
> +}
> +
> +static int aspeed_video_start(struct aspeed_video *video)
> +{
> + int rc;
> +
> + aspeed_video_on(video);
> +
> + aspeed_video_init_regs(video);
> +
> + rc = aspeed_video_get_resolution(video);
> + if (rc)
> + return rc;
> +
> + video->v4l2_fmt.width = video->width;
> + video->v4l2_fmt.height = video->height;
> + video->v4l2_fmt.sizeimage = video->max_compressed_size;
> +
> + return 0;
> +}
> +
> +static void aspeed_video_stop(struct aspeed_video *video)
> +{
> + cancel_delayed_work_sync(&video->res_work);
> +
> + aspeed_video_off(video);
> +
> + if (video->srcs[0].size)
> + aspeed_video_free_buf(video, &video->srcs[0]);
> +
> + if (video->srcs[1].size)
> + aspeed_video_free_buf(video, &video->srcs[1]);
> +
> + video->flags = 0;
> +}
> +
> +static int aspeed_video_querycap(struct file *file, void *fh,
> + struct v4l2_capability *cap)
> +{
> + strscpy(cap->driver, DEVICE_NAME, sizeof(cap->driver));
> + strscpy(cap->card, "Aspeed Video Engine", sizeof(cap->card));
> + snprintf(cap->bus_info, sizeof(cap->bus_info), "platform:%s",
> + DEVICE_NAME);
> +
> + return 0;
> +}
> +
> +static int aspeed_video_enum_format(struct file *file, void *fh,
> + struct v4l2_fmtdesc *f)
> +{
> + if (f->index)
> + return -EINVAL;
> +
> + f->pixelformat = V4L2_PIX_FMT_JPEG;
> + f->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;

No need to set the type, it's already checked in the core.

> + f->flags = V4L2_FMT_FLAG_COMPRESSED;

No need to set this flag, it will be set for you.

> +
> + return 0;
> +}
> +
> +static int aspeed_video_get_format(struct file *file, void *fh,
> + struct v4l2_format *f)
> +{
> + struct aspeed_video *video = video_drvdata(file);
> +
> + f->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;

No need to set type.

> + f->fmt.pix = video->v4l2_fmt;
> +
> + return 0;
> +}
> +
> +static int aspeed_video_enum_input(struct file *file, void *fh,
> + struct v4l2_input *inp)
> +{
> + if (inp->index)
> + return -EINVAL;
> +
> + strscpy(inp->name, "Host VGA capture", sizeof(inp->name));
> + inp->type = V4L2_INPUT_TYPE_CAMERA;
> + inp->capabilities = V4L2_IN_CAP_DV_TIMINGS;

Update status information. Typically V4L2_IN_ST_NO_SIGNAL is set and V4L2_IN_ST_NO_SYNC.

> +
> + return 0;
> +}
> +
> +static int aspeed_video_get_input(struct file *file, void *fh, unsigned int *i)
> +{
> + *i = 0;
> +
> + return 0;
> +}
> +
> +static int aspeed_video_set_input(struct file *file, void *fh, unsigned int i)
> +{
> + if (i)
> + return -EINVAL;
> +
> + return 0;
> +}
> +
> +static int aspeed_video_get_parm(struct file *file, void *fh,
> + struct v4l2_streamparm *a)
> +{
> + struct aspeed_video *video = video_drvdata(file);
> +
> + a->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
> + a->parm.capture.readbuffers = 3;
> + a->parm.capture.timeperframe.numerator = 1;
> + if (!video->frame_rate)
> + a->parm.capture.timeperframe.denominator = MAX_FRAME_RATE + 1;
> + else
> + a->parm.capture.timeperframe.denominator = video->frame_rate;
> +
> + return 0;
> +}
> +
> +static int aspeed_video_set_parm(struct file *file, void *fh,
> + struct v4l2_streamparm *a)
> +{
> + unsigned int frame_rate = 0;
> + struct aspeed_video *video = video_drvdata(file);
> +
> + a->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
> + a->parm.capture.readbuffers = 3;
> +
> + if (a->parm.capture.timeperframe.numerator)
> + frame_rate = a->parm.capture.timeperframe.denominator /
> + a->parm.capture.timeperframe.numerator;
> +
> + if (!frame_rate || frame_rate > MAX_FRAME_RATE) {
> + frame_rate = 0;
> +
> + /*
> + * Set to max + 1 to differentiate between max and 0, which
> + * means "don't care".
> + */
> + a->parm.capture.timeperframe.denominator = MAX_FRAME_RATE + 1;
> + a->parm.capture.timeperframe.numerator = 1;
> + }
> +
> + if (video->frame_rate != frame_rate) {
> + video->frame_rate = frame_rate;
> + aspeed_video_update(video, VE_CTRL, ~VE_CTRL_FRC,
> + FIELD_PREP(VE_CTRL_FRC, frame_rate));
> + }
> +
> + return 0;
> +}
> +
> +static int aspeed_video_enum_framesizes(struct file *file, void *fh,
> + struct v4l2_frmsizeenum *fsize)
> +{
> + struct aspeed_video *video = video_drvdata(file);
> +
> + if (fsize->pixel_format != V4L2_PIX_FMT_JPEG)
> + return -EINVAL;
> +
> + switch (fsize->index) {
> + case 0:
> + fsize->discrete.width = video->v4l2_fmt.width;
> + fsize->discrete.height = video->v4l2_fmt.height;
> + break;
> + case 1:
> + if (video->width == video->v4l2_fmt.width &&
> + video->height == video->v4l2_fmt.height)
> + return -EINVAL;
> +
> + fsize->discrete.width = video->width;
> + fsize->discrete.height = video->height;

This looks weird. What's the reason for this case 1?

> + break;
> + default:
> + return -EINVAL;
> + }
> +
> + fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
> +
> + return 0;
> +}
> +
> +static int aspeed_video_enum_frameintervals(struct file *file, void *fh,
> + struct v4l2_frmivalenum *fival)
> +{
> + struct aspeed_video *video = video_drvdata(file);
> +
> + if (fival->index)
> + return -EINVAL;
> +
> + if (fival->width != video->width || fival->height != video->height)
> + return -EINVAL;
> +
> + if (fival->pixel_format != V4L2_PIX_FMT_JPEG)
> + return -EINVAL;
> +
> + fival->type = V4L2_FRMIVAL_TYPE_CONTINUOUS;
> +
> + fival->stepwise.min.denominator = MAX_FRAME_RATE;
> + fival->stepwise.min.numerator = 1;
> + fival->stepwise.max.denominator = 1;
> + fival->stepwise.max.numerator = 1;
> + fival->stepwise.step = fival->stepwise.max;
> +
> + return 0;
> +}
> +
> +static int aspeed_video_set_dv_timings(struct file *file, void *fh,
> + struct v4l2_dv_timings *timings)
> +{
> + struct aspeed_video *video = video_drvdata(file);
> +
> + if (video->width != timings->bt.width ||
> + video->height != timings->bt.height)
> + return -EINVAL;
> +
> + video->v4l2_fmt.width = timings->bt.width;
> + video->v4l2_fmt.height = timings->bt.height;
> + video->v4l2_fmt.sizeimage = video->max_compressed_size;
> +
> + timings->type = V4L2_DV_BT_656_1120;
> +
> + return 0;
> +}
> +
> +static int aspeed_video_get_dv_timings(struct file *file, void *fh,
> + struct v4l2_dv_timings *timings)
> +{
> + int rc;
> + struct aspeed_video *video = video_drvdata(file);
> +
> + if (file->f_flags & O_NONBLOCK) {
> + if (test_bit(VIDEO_RES_CHANGE, &video->flags))
> + return -EAGAIN;
> + } else {
> + rc = wait_event_interruptible(video->wait,
> + !test_bit(VIDEO_RES_CHANGE,
> + &video->flags));
> + if (rc)
> + return -EINTR;
> + }

This is wrong. get_dv_timings should return what set_dv_timings set,
regardless of what the actual detected timings are.

What you are actually implementing here is query_dv_timings :-)

> +
> + memset(timings, 0, sizeof(*timings));
> +
> + timings->type = V4L2_DV_BT_656_1120;
> + timings->bt.width = video->width;
> + timings->bt.height = video->height;
> +
> + return 0;
> +}
> +
> +static int aspeed_video_enum_dv_timings(struct file *file, void *fh,
> + struct v4l2_enum_dv_timings *timings)
> +{
> + if (timings->index)
> + return -EINVAL;
> +
> + return aspeed_video_get_dv_timings(file, fh, &timings->timings);
> +}
> +
> +static int aspeed_video_dv_timings_cap(struct file *file, void *fh,
> + struct v4l2_dv_timings_cap *cap)
> +{
> + struct aspeed_video *video = video_drvdata(file);
> +
> + cap->type = V4L2_DV_BT_656_1120;
> + cap->bt.capabilities = V4L2_DV_BT_CAP_PROGRESSIVE;
> + cap->bt.min_width = video->width;
> + cap->bt.max_width = video->width;
> + cap->bt.min_height = video->height;
> + cap->bt.max_height = video->height;
> +
> + return 0;
> +}

Hmm. I need to think about enum_dv_timings and dv_timings_cap a bit more. This is
a somewhat odd situation and it needs some thought to decide what these functions
should do.

> +
> +static int aspeed_video_sub_event(struct v4l2_fh *fh,
> + const struct v4l2_event_subscription *sub)
> +{
> + switch (sub->type) {
> + case V4L2_EVENT_SOURCE_CHANGE:
> + return v4l2_src_change_event_subscribe(fh, sub);
> + }
> +
> + return v4l2_ctrl_subscribe_event(fh, sub);
> +}
> +
> +static const struct v4l2_ioctl_ops aspeed_video_ioctl_ops = {
> + .vidioc_querycap = aspeed_video_querycap,
> +
> + .vidioc_enum_fmt_vid_cap = aspeed_video_enum_format,
> + .vidioc_g_fmt_vid_cap = aspeed_video_get_format,
> + .vidioc_s_fmt_vid_cap = aspeed_video_get_format,
> + .vidioc_try_fmt_vid_cap = aspeed_video_get_format,
> +
> + .vidioc_reqbufs = vb2_ioctl_reqbufs,
> + .vidioc_querybuf = vb2_ioctl_querybuf,
> + .vidioc_qbuf = vb2_ioctl_qbuf,
> + .vidioc_dqbuf = vb2_ioctl_dqbuf,
> + .vidioc_create_bufs = vb2_ioctl_create_bufs,
> + .vidioc_prepare_buf = vb2_ioctl_prepare_buf,
> + .vidioc_streamon = vb2_ioctl_streamon,
> + .vidioc_streamoff = vb2_ioctl_streamoff,
> +
> + .vidioc_enum_input = aspeed_video_enum_input,
> + .vidioc_g_input = aspeed_video_get_input,
> + .vidioc_s_input = aspeed_video_set_input,
> +
> + .vidioc_g_parm = aspeed_video_get_parm,
> + .vidioc_s_parm = aspeed_video_set_parm,
> + .vidioc_enum_framesizes = aspeed_video_enum_framesizes,
> + .vidioc_enum_frameintervals = aspeed_video_enum_frameintervals,
> +
> + .vidioc_s_dv_timings = aspeed_video_set_dv_timings,
> + .vidioc_g_dv_timings = aspeed_video_get_dv_timings,
> + .vidioc_query_dv_timings = aspeed_video_get_dv_timings,
> + .vidioc_enum_dv_timings = aspeed_video_enum_dv_timings,
> + .vidioc_dv_timings_cap = aspeed_video_dv_timings_cap,
> +
> + .vidioc_subscribe_event = aspeed_video_sub_event,
> + .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
> +};
> +
> +static void aspeed_video_update_jpeg_quality(struct aspeed_video *video)
> +{
> + u32 comp_ctrl = FIELD_PREP(VE_COMP_CTRL_DCT_LUM, video->jpeg_quality) |
> + FIELD_PREP(VE_COMP_CTRL_DCT_CHR, video->jpeg_quality | 0x10);
> +
> + aspeed_video_update(video, VE_COMP_CTRL,
> + ~(VE_COMP_CTRL_DCT_LUM | VE_COMP_CTRL_DCT_CHR),
> + comp_ctrl);
> +}
> +
> +static void aspeed_video_update_subsampling(struct aspeed_video *video)
> +{
> + if (video->jpeg.virt)
> + aspeed_video_init_jpeg_table(video->jpeg.virt, video->yuv420);
> +
> + if (video->yuv420)
> + aspeed_video_update(video, VE_SEQ_CTRL, 0xffffffff,
> + VE_SEQ_CTRL_YUV420);
> + else
> + aspeed_video_update(video, VE_SEQ_CTRL, ~VE_SEQ_CTRL_YUV420,
> + 0);
> +}
> +
> +static int aspeed_video_set_ctrl(struct v4l2_ctrl *ctrl)
> +{
> + struct aspeed_video *video = container_of(ctrl->handler,
> + struct aspeed_video,
> + ctrl_handler);
> +
> + switch (ctrl->id) {
> + case V4L2_CID_JPEG_COMPRESSION_QUALITY:
> + if (video->jpeg_quality != ctrl->val) {

No need to check. This function is only called if the new value if different
from the old.

> + video->jpeg_quality = ctrl->val;
> + aspeed_video_update_jpeg_quality(video);
> + }
> + break;
> + case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
> + if (ctrl->val == V4L2_JPEG_CHROMA_SUBSAMPLING_420) {
> + video->yuv420 = true;
> + aspeed_video_update_subsampling(video);
> + } else {
> + video->yuv420 = false;
> + aspeed_video_update_subsampling(video);
> + }
> + break;
> + default:
> + return -EINVAL;
> + }
> +
> + return 0;
> +}
> +
> +static const struct v4l2_ctrl_ops aspeed_video_ctrl_ops = {
> + .s_ctrl = aspeed_video_set_ctrl,
> +};
> +
> +static void aspeed_video_resolution_work(struct work_struct *work)
> +{
> + int rc;
> + struct delayed_work *dwork = to_delayed_work(work);
> + struct aspeed_video *video = container_of(dwork, struct aspeed_video,
> + res_work);
> +
> + /* No clients remaining after delay */
> + if (atomic_read(&video->clients) == 0)
> + goto done;
> +
> + aspeed_video_on(video);
> +
> + aspeed_video_init_regs(video);
> +
> + rc = aspeed_video_get_resolution(video);
> + if (rc) {
> + dev_err(video->dev,
> + "resolution changed; couldn't get new resolution\n");

You also need to send the event if there is no resolution.

You need to keep track of the current state (found resolution or not) and only
send this event when you transition from one state to another.

> + } else {
> + static const struct v4l2_event ev = {
> + .type = V4L2_EVENT_SOURCE_CHANGE,
> + .u.src_change.changes = V4L2_EVENT_SRC_CH_RESOLUTION,
> + };
> +
> + v4l2_event_queue(&video->vdev, &ev);
> +
> + if (test_bit(VIDEO_STREAMING, &video->flags))
> + aspeed_video_start_frame(video);
> + }
> +
> +done:
> + clear_bit(VIDEO_RES_CHANGE, &video->flags);
> + wake_up_interruptible_all(&video->wait);
> +}
> +
> +static int aspeed_video_open(struct file *file)
> +{
> + int rc;
> + struct aspeed_video *video = video_drvdata(file);
> +
> + if (atomic_inc_return(&video->clients) == 1) {
> + rc = aspeed_video_start(video);
> + if (rc) {
> + dev_err(video->dev, "Failed to start video engine\n");
> + atomic_dec(&video->clients);
> + return rc;
> + }
> + }
> +
> + return v4l2_fh_open(file);
> +}
> +
> +static int aspeed_video_release(struct file *file)
> +{
> + int rc;
> + struct aspeed_video *video = video_drvdata(file);
> +
> + rc = vb2_fop_release(file);
> +

You need to lock video->video_lock here. Otherwise an open can occur while
you are in aspeed_video_stop. You also need to take this lock for the same
reason in aspeed_video_open above.

> + if (atomic_dec_return(&video->clients) == 0)
> + aspeed_video_stop(video);
> +
> + return rc;
> +}
> +
> +static const struct v4l2_file_operations aspeed_video_v4l2_fops = {
> + .owner = THIS_MODULE,
> + .read = vb2_fop_read,
> + .poll = vb2_fop_poll,
> + .unlocked_ioctl = video_ioctl2,
> + .mmap = vb2_fop_mmap,
> + .open = aspeed_video_open,
> + .release = aspeed_video_release,
> +};
> +
> +static int aspeed_video_queue_setup(struct vb2_queue *q,
> + unsigned int *num_buffers,
> + unsigned int *num_planes,
> + unsigned int sizes[],
> + struct device *alloc_devs[])
> +{
> + struct aspeed_video *video = vb2_get_drv_priv(q);
> +
> + if (*num_planes) {
> + if (sizes[0] < video->max_compressed_size)
> + return -EINVAL;
> +
> + return 0;
> + }
> +
> + *num_planes = 1;
> + sizes[0] = video->max_compressed_size;
> +
> + return 0;
> +}
> +
> +static int aspeed_video_buf_prepare(struct vb2_buffer *vb)
> +{
> + struct aspeed_video *video = vb2_get_drv_priv(vb->vb2_queue);
> +
> + if (vb2_plane_size(vb, 0) < video->max_compressed_size)
> + return -EINVAL;
> +
> + return 0;
> +}
> +
> +static int aspeed_video_start_streaming(struct vb2_queue *q,
> + unsigned int count)
> +{
> + int rc;
> + struct aspeed_video *video = vb2_get_drv_priv(q);
> +
> + rc = aspeed_video_start_frame(video);
> + if (rc) {
> + aspeed_video_buf_err(video);

If start_streaming fails, then the buffers should be returned to state
QUEUED, not ERROR. Most drivers have a similar function to aspeed_video_buf_err,
but the state is an argument.

> + return rc;
> + }
> +
> + video->sequence = 0;
> + set_bit(VIDEO_STREAMING, &video->flags);
> + return 0;
> +}
> +
> +static void aspeed_video_stop_streaming(struct vb2_queue *q)
> +{
> + int rc;
> + struct aspeed_video *video = vb2_get_drv_priv(q);
> +
> + clear_bit(VIDEO_STREAMING, &video->flags);
> +
> + rc = wait_event_timeout(video->wait,
> + !test_bit(VIDEO_FRAME_INPRG, &video->flags),
> + STOP_TIMEOUT);
> + if (!rc) {
> + dev_err(video->dev, "Timed out when stopping streaming\n");
> + aspeed_video_stop(video);
> + }
> +
> + aspeed_video_buf_err(video);
> +}
> +
> +static void aspeed_video_buf_queue(struct vb2_buffer *vb)
> +{
> + unsigned long flags;

Move this to below the avb declaration.

> + struct aspeed_video *video = vb2_get_drv_priv(vb->vb2_queue);
> + struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
> + struct aspeed_video_buffer *avb = to_aspeed_video_buffer(vbuf);
> +
> + spin_lock_irqsave(&video->lock, flags);
> + list_add_tail(&avb->link, &video->buffers);
> + spin_unlock_irqrestore(&video->lock, flags);
> +}
> +
> +static const struct vb2_ops aspeed_video_vb2_ops = {
> + .queue_setup = aspeed_video_queue_setup,
> + .buf_prepare = aspeed_video_buf_prepare,
> + .start_streaming = aspeed_video_start_streaming,
> + .stop_streaming = aspeed_video_stop_streaming,
> + .buf_queue = aspeed_video_buf_queue,

Add this:

.wait_prepare = vb2_ops_wait_prepare,
.wait_finish = vb2_ops_wait_finish,

That should fix the streaming v4l2-compliance fail.

> +};
> +
> +static int aspeed_video_setup_video(struct aspeed_video *video)
> +{
> + int rc;

Move this to below the vdev declaration.

> + u64 mask = ~(BIT(V4L2_JPEG_CHROMA_SUBSAMPLING_444) |
> + BIT(V4L2_JPEG_CHROMA_SUBSAMPLING_420));

Can be const.

> + struct v4l2_device *v4l2_dev = &video->v4l2_dev;
> + struct vb2_queue *vbq = &video->queue;
> + struct video_device *vdev = &video->vdev;
> +
> + video->v4l2_fmt.pixelformat = V4L2_PIX_FMT_JPEG;
> + video->v4l2_fmt.field = V4L2_FIELD_NONE;
> + video->v4l2_fmt.colorspace = V4L2_COLORSPACE_SRGB;
> + video->v4l2_fmt.quantization = V4L2_QUANTIZATION_FULL_RANGE;
> +
> + rc = v4l2_device_register(video->dev, v4l2_dev);
> + if (rc) {
> + dev_err(video->dev, "Failed to register v4l2 device\n");
> + return rc;
> + }
> +
> + v4l2_ctrl_handler_init(&video->ctrl_handler, 2);
> + v4l2_ctrl_new_std(&video->ctrl_handler, &aspeed_video_ctrl_ops,
> + V4L2_CID_JPEG_COMPRESSION_QUALITY, 0,
> + ASPEED_VIDEO_JPEG_NUM_QUALITIES - 1, 1, 0);
> + v4l2_ctrl_new_std_menu(&video->ctrl_handler, &aspeed_video_ctrl_ops,
> + V4L2_CID_JPEG_CHROMA_SUBSAMPLING,
> + V4L2_JPEG_CHROMA_SUBSAMPLING_420, mask,
> + V4L2_JPEG_CHROMA_SUBSAMPLING_444);
> +
> + if (video->ctrl_handler.error) {
> + v4l2_ctrl_handler_free(&video->ctrl_handler);
> + v4l2_device_unregister(v4l2_dev);
> +
> + dev_err(video->dev, "Failed to init controls: %d\n",
> + video->ctrl_handler.error);
> + return rc;
> + }
> +
> + v4l2_dev->ctrl_handler = &video->ctrl_handler;
> + vdev->ctrl_handler = &video->ctrl_handler;

Not necessary. Setting it in v4l2_dev is sufficient.

> +
> + vbq->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
> + vbq->io_modes = VB2_MMAP | VB2_READ;

Add VB2_DMABUF.

> + vbq->dev = v4l2_dev->dev;
> + vbq->lock = &video->video_lock;
> + vbq->ops = &aspeed_video_vb2_ops;
> + vbq->mem_ops = &vb2_dma_contig_memops;
> + vbq->drv_priv = video;
> + vbq->buf_struct_size = sizeof(struct aspeed_video_buffer);
> + vbq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
> + vbq->min_buffers_needed = 3;
> +
> + rc = vb2_queue_init(vbq);
> + if (rc) {
> + v4l2_ctrl_handler_free(&video->ctrl_handler);
> + v4l2_device_unregister(v4l2_dev);
> +
> + dev_err(video->dev, "Failed to init vb2 queue\n");
> + return rc;
> + }
> +
> + vdev->queue = vbq;
> + vdev->fops = &aspeed_video_v4l2_fops;
> + vdev->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_READWRITE |
> + V4L2_CAP_STREAMING;
> + vdev->v4l2_dev = v4l2_dev;
> + strscpy(vdev->name, DEVICE_NAME, sizeof(vdev->name));
> + vdev->vfl_type = VFL_TYPE_GRABBER;
> + vdev->vfl_dir = VFL_DIR_RX;
> + vdev->release = video_device_release_empty;
> + vdev->ioctl_ops = &aspeed_video_ioctl_ops;
> + vdev->lock = &video->video_lock;
> +
> + video_set_drvdata(vdev, video);
> + rc = video_register_device(vdev, VFL_TYPE_GRABBER, 0);
> + if (rc) {
> + vb2_queue_release(vbq);
> + v4l2_ctrl_handler_free(&video->ctrl_handler);
> + v4l2_device_unregister(v4l2_dev);
> +
> + dev_err(video->dev, "Failed to register video device\n");
> + return rc;
> + }
> +
> + return 0;
> +}
> +
> +static int aspeed_video_init(struct aspeed_video *video)
> +{
> + int irq;
> + int rc;
> + struct device *dev = video->dev;
> +
> + irq = irq_of_parse_and_map(dev->of_node, 0);
> + if (!irq) {
> + dev_err(dev, "Unable to find IRQ\n");
> + return -ENODEV;
> + }
> +
> + rc = devm_request_irq(dev, irq, aspeed_video_irq, IRQF_SHARED,
> + DEVICE_NAME, video);
> + if (rc < 0) {
> + dev_err(dev, "Unable to request IRQ %d\n", irq);
> + return rc;
> + }
> +
> + video->eclk = devm_clk_get(dev, "eclk");
> + if (IS_ERR(video->eclk)) {
> + dev_err(dev, "Unable to get ECLK\n");
> + return PTR_ERR(video->eclk);
> + }
> +
> + video->vclk = devm_clk_get(dev, "vclk");
> + if (IS_ERR(video->vclk)) {
> + dev_err(dev, "Unable to get VCLK\n");
> + return PTR_ERR(video->vclk);
> + }
> +
> + video->rst = devm_reset_control_get_exclusive(dev, NULL);
> + if (IS_ERR(video->rst)) {
> + dev_err(dev, "Unable to get VE reset\n");
> + return PTR_ERR(video->rst);
> + }
> +
> + rc = of_reserved_mem_device_init(dev);
> + if (rc) {
> + dev_err(dev, "Unable to reserve memory\n");
> + return rc;
> + }
> +
> + rc = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
> + if (rc) {
> + dev_err(dev, "Failed to set DMA mask\n");
> + of_reserved_mem_device_release(dev);
> + return rc;
> + }
> +
> + if (!aspeed_video_alloc_buf(video, &video->jpeg,
> + VE_JPEG_HEADER_SIZE)) {
> + dev_err(dev, "Failed to allocate DMA for JPEG header\n");
> + of_reserved_mem_device_release(dev);
> + return rc;
> + }
> +
> + aspeed_video_init_jpeg_table(video->jpeg.virt, video->yuv420);
> +
> + return 0;
> +}
> +
> +static int aspeed_video_probe(struct platform_device *pdev)
> +{
> + int rc;
> + struct resource *res;
> + struct aspeed_video *video = kzalloc(sizeof(*video), GFP_KERNEL);
> +
> + if (!video)
> + return -ENOMEM;
> +
> + video->frame_rate = 30;
> + video->dev = &pdev->dev;
> + mutex_init(&video->video_lock);
> + init_waitqueue_head(&video->wait);
> + INIT_DELAYED_WORK(&video->res_work, aspeed_video_resolution_work);
> + INIT_LIST_HEAD(&video->buffers);
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +
> + video->base = devm_ioremap_resource(video->dev, res);
> +
> + if (IS_ERR(video->base))
> + return PTR_ERR(video->base);
> +
> + rc = aspeed_video_init(video);
> + if (rc)
> + return rc;
> +
> + rc = aspeed_video_setup_video(video);
> + if (rc)
> + return rc;
> +
> + return 0;
> +}
> +
> +static int aspeed_video_remove(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct v4l2_device *v4l2_dev = dev_get_drvdata(dev);
> + struct aspeed_video *video = to_aspeed_video(v4l2_dev);
> +
> + video_unregister_device(&video->vdev);
> +
> + vb2_queue_release(&video->queue);
> +
> + v4l2_ctrl_handler_free(&video->ctrl_handler);
> +
> + v4l2_device_unregister(v4l2_dev);
> +
> + dma_free_coherent(video->dev, VE_JPEG_HEADER_SIZE, video->jpeg.virt,
> + video->jpeg.dma);
> +
> + of_reserved_mem_device_release(dev);
> +
> + return 0;
> +}
> +
> +static const struct of_device_id aspeed_video_of_match[] = {
> + { .compatible = "aspeed,ast2400-video-engine" },
> + { .compatible = "aspeed,ast2500-video-engine" },
> + {}
> +};
> +MODULE_DEVICE_TABLE(of, aspeed_video_of_match);
> +
> +static struct platform_driver aspeed_video_driver = {
> + .driver = {
> + .name = DEVICE_NAME,
> + .of_match_table = aspeed_video_of_match,
> + },
> + .probe = aspeed_video_probe,
> + .remove = aspeed_video_remove,
> +};
> +
> +module_platform_driver(aspeed_video_driver);
> +
> +MODULE_DESCRIPTION("ASPEED Video Engine Driver");
> +MODULE_AUTHOR("Eddie James");
> +MODULE_LICENSE("GPL v2");
>

Regards,

Hans