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Date: Wed, 28 Dec 2022 11:50:24 +0100
From: Paul Menzel <pmenzel@...gen.mpg.de>
To: Marvin Lin <milkfafa@...il.com>
Cc: mchehab@...nel.org, hverkuil-cisco@...all.nl,
avifishman70@...il.com, tmaimon77@...il.com, tali.perry1@...il.com,
venture@...gle.com, yuenn@...gle.com, benjaminfair@...gle.com,
robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
andrzej.p@...labora.com, kwliu@...oton.com,
devicetree@...r.kernel.org, openbmc@...ts.ozlabs.org,
linux-kernel@...r.kernel.org, kflin@...oton.com,
linux-media@...r.kernel.org
Subject: Re: [PATCH v10 7/7] media: nuvoton: Add driver for NPCM video capture
and encode engine
Dear Lin,
Thank you for the patches.
Am 27.12.22 um 10:51 schrieb Marvin Lin:
> Add driver for Video Capture/Differentiation Engine (VCD) and Encoding
> Compression Engine (ECE) present on Nuvoton NPCM SoCs. The VCD can
> capture and differentiate video data from digital or analog sources,
“differentiate video data” sounds uncommon to me. Am I just ignorant or
is there a better term?
> then the ECE will compress the data into HEXTILE format. This driver
> implements V4L2 interfaces and provides user controls to support KVM
> feature, also tested with VNC Viewer and openbmc/obmc-ikvm.
Wich VNC viewer and version? Maybe also paste the new dev_ log messages
you get from one boot.
It’d be great if you noted the datasheet name and revision.
> Signed-off-by: Marvin Lin <milkfafa@...il.com>
> ---
> MAINTAINERS | 12 +
> drivers/media/platform/Kconfig | 1 +
> drivers/media/platform/Makefile | 1 +
> drivers/media/platform/nuvoton/Kconfig | 15 +
> drivers/media/platform/nuvoton/Makefile | 2 +
> drivers/media/platform/nuvoton/npcm-regs.h | 171 ++
> drivers/media/platform/nuvoton/npcm-video.c | 1814 +++++++++++++++++++
> 7 files changed, 2016 insertions(+)
> create mode 100644 drivers/media/platform/nuvoton/Kconfig
> create mode 100644 drivers/media/platform/nuvoton/Makefile
> create mode 100644 drivers/media/platform/nuvoton/npcm-regs.h
> create mode 100644 drivers/media/platform/nuvoton/npcm-video.c
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index f61eb221415b..1b56042d1dc3 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -2603,6 +2603,18 @@ F: drivers/rtc/rtc-nct3018y.c
> F: include/dt-bindings/clock/nuvoton,npcm7xx-clock.h
> F: include/dt-bindings/clock/nuvoton,npcm845-clk.h
>
> +ARM/NUVOTON NPCM VIDEO ENGINE DRIVER
> +M: Joseph Liu <kwliu@...oton.com>
> +M: Marvin Lin <kflin@...oton.com>
> +L: linux-media@...r.kernel.org
> +L: openbmc@...ts.ozlabs.org (moderated for non-subscribers)
> +S: Maintained
> +F: Documentation/devicetree/bindings/media/nuvoton,npcm-ece.yaml
> +F: Documentation/devicetree/bindings/media/nuvoton,npcm-vcd.yaml
> +F: Documentation/userspace-api/media/drivers/npcm-video.rst
> +F: drivers/media/platform/nuvoton/
> +F: include/uapi/linux/npcm-video.h
> +
> ARM/NUVOTON WPCM450 ARCHITECTURE
> M: Jonathan Neuschäfer <j.neuschaefer@....net>
> L: openbmc@...ts.ozlabs.org (moderated for non-subscribers)
> diff --git a/drivers/media/platform/Kconfig b/drivers/media/platform/Kconfig
> index ee579916f874..91e54215de3a 100644
> --- a/drivers/media/platform/Kconfig
> +++ b/drivers/media/platform/Kconfig
> @@ -73,6 +73,7 @@ source "drivers/media/platform/intel/Kconfig"
> source "drivers/media/platform/marvell/Kconfig"
> source "drivers/media/platform/mediatek/Kconfig"
> source "drivers/media/platform/microchip/Kconfig"
> +source "drivers/media/platform/nuvoton/Kconfig"
> source "drivers/media/platform/nvidia/Kconfig"
> source "drivers/media/platform/nxp/Kconfig"
> source "drivers/media/platform/qcom/Kconfig"
> diff --git a/drivers/media/platform/Makefile b/drivers/media/platform/Makefile
> index 5453bb868e67..3296ec1ebe16 100644
> --- a/drivers/media/platform/Makefile
> +++ b/drivers/media/platform/Makefile
> @@ -16,6 +16,7 @@ obj-y += intel/
> obj-y += marvell/
> obj-y += mediatek/
> obj-y += microchip/
> +obj-y += nuvoton/
> obj-y += nvidia/
> obj-y += nxp/
> obj-y += qcom/
> diff --git a/drivers/media/platform/nuvoton/Kconfig b/drivers/media/platform/nuvoton/Kconfig
> new file mode 100644
> index 000000000000..5047d1ba3de5
> --- /dev/null
> +++ b/drivers/media/platform/nuvoton/Kconfig
> @@ -0,0 +1,15 @@
> +# SPDX-License-Identifier: GPL-2.0-only
> +
> +comment "Nuvoton media platform drivers"
> +
> +config VIDEO_NPCM_VCD_ECE
> + tristate "Nuvoton NPCM Video Capture/Encode Engine driver"
> + depends on V4L_PLATFORM_DRIVERS
> + depends on VIDEO_DEV
> + select VIDEOBUF2_DMA_CONTIG
> + help
> + Support for the Video Capture/Differentiation Engine (VCD) and
> + Encoding Compression Engine (ECE) present on Nuvoton NPCM SoCs.
> + The VCD can capture and differentiate video data from digital or
> + analog sources, then the ECE will compress the data into HEXTILE
> + format.
> diff --git a/drivers/media/platform/nuvoton/Makefile b/drivers/media/platform/nuvoton/Makefile
> new file mode 100644
> index 000000000000..74a4e3fc8555
> --- /dev/null
> +++ b/drivers/media/platform/nuvoton/Makefile
> @@ -0,0 +1,2 @@
> +# SPDX-License-Identifier: GPL-2.0-only
> +obj-$(CONFIG_VIDEO_NPCM_VCD_ECE) += npcm-video.o
> diff --git a/drivers/media/platform/nuvoton/npcm-regs.h b/drivers/media/platform/nuvoton/npcm-regs.h
> new file mode 100644
> index 000000000000..f528f5726307
> --- /dev/null
> +++ b/drivers/media/platform/nuvoton/npcm-regs.h
> @@ -0,0 +1,171 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Register definition header for NPCM video driver
> + *
> + * Copyright (C) 2022 Nuvoton Technologies
> + */
> +
> +#ifndef _NPCM_REGS_H
> +#define _NPCM_REGS_H
[…]
> +struct npcm_video_addr {
> + size_t size;
> + dma_addr_t dma;
> + void *virt;
> +};
> +
> +struct npcm_video_buffer {
> + struct vb2_v4l2_buffer vb;
> + struct list_head link;
> +};
> +
> +#define to_npcm_video_buffer(x) \
> + container_of((x), struct npcm_video_buffer, vb)
> +
> +enum {
> + VIDEO_STREAMING,
> + VIDEO_FRAME_INPRG,
> + VIDEO_STOPPED,
> +};
> +
> +struct rect_list {
> + struct v4l2_clip clip;
> + struct list_head list;
> +};
> +
> +struct rect_list_info {
> + struct rect_list *list;
> + struct rect_list *first;
> + struct list_head *head;
> + unsigned int index;
> + unsigned int tile_perline;
> + unsigned int tile_perrow;
> + unsigned int offset_perline;
> + unsigned int tile_size;
> + unsigned int tile_cnt;
> +};
> +
> +struct npcm_ece {
> + struct regmap *regmap;
> + atomic_t clients;
> + struct reset_control *reset;
> +};
> +
> +struct npcm_video {
> + struct regmap *gcr_regmap;
> + struct regmap *gfx_regmap;
> + struct regmap *vcd_regmap;
> +
> + struct device *dev;
> + struct v4l2_ctrl_handler ctrl_handler;
> + struct v4l2_device v4l2_dev;
> + struct v4l2_pix_format pix_fmt;
> + struct v4l2_bt_timings active_timings;
> + struct v4l2_bt_timings detected_timings;
> + u32 v4l2_input_status;
> + struct vb2_queue queue;
> + struct video_device vdev;
> + struct mutex video_lock; /* v4l2 and videobuf2 lock */
> +
> + struct list_head buffers;
> + spinlock_t lock; /* buffer list lock */
> + unsigned long flags;
> + unsigned int sequence;
> +
> + size_t max_buffer_size;
> + struct npcm_video_addr src;
> + struct reset_control *reset;
> + struct npcm_ece ece;
> +
> + unsigned int frame_rate;
> + unsigned int vb_index;
> + u32 bytesperline;
> + u8 bytesperpixel;
> + u32 rect_cnt;
> + u8 num_buffers;
> + struct list_head *list;
> + u32 *rect;
> + int ctrl_cmd;
> + int op_cmd;
> +};
> +
> +#define to_npcm_video(x) container_of((x), struct npcm_video, v4l2_dev)
> +
> +static const struct v4l2_dv_timings_cap npcm_video_timings_cap = {
> + .type = V4L2_DV_BT_656_1120,
> + .bt = {
> + .min_width = MIN_WIDTH,
> + .max_width = MAX_WIDTH,
> + .min_height = MIN_HEIGHT,
> + .max_height = MAX_HEIGHT,
> + .min_pixelclock = 6574080, /* 640 x 480 x 24Hz */
> + .max_pixelclock = 138240000, /* 1920 x 1200 x 60Hz */
> + .standards = V4L2_DV_BT_STD_CEA861 | V4L2_DV_BT_STD_DMT |
> + V4L2_DV_BT_STD_CVT | V4L2_DV_BT_STD_GTF,
> + .capabilities = V4L2_DV_BT_CAP_PROGRESSIVE |
> + V4L2_DV_BT_CAP_REDUCED_BLANKING |
> + V4L2_DV_BT_CAP_CUSTOM,
> + },
> +};
> +
> +static DECLARE_BITMAP(bitmap, BITMAP_SIZE);
> +
> +static void npcm_video_ece_prepend_rect_header(u8 *addr, u16 x, u16 y, u16 w, u16 h)
> +{
> + __be16 x_pos = cpu_to_be16(x);
> + __be16 y_pos = cpu_to_be16(y);
> + __be16 width = cpu_to_be16(w);
> + __be16 height = cpu_to_be16(h);
> + __be32 encoding = cpu_to_be32(5); /* Hextile encoding */
> +
> + memcpy(addr, &x_pos, 2);
> + memcpy(addr + 2, &y_pos, 2);
> + memcpy(addr + 4, &width, 2);
> + memcpy(addr + 6, &height, 2);
> + memcpy(addr + 8, &encoding, 4);
> +}
> +
> +static unsigned int npcm_video_ece_get_ed_size(struct npcm_video *video,
> + u32 offset, u8 *addr)
> +{
> + struct regmap *ece = video->ece.regmap;
> + u32 size, gap, val;
Using a fixed size type for variables not needing is, is actually not an
optimization [1]. It’d be great, if you went over the whole change-set
to use the non-fixed types, where possible. (You can also check the
difference with `scripts/bloat-o-meter`.
> + int ret;
> +
> + ret = regmap_read_poll_timeout(ece, ECE_DDA_STS, val,
> + (val & ECE_DDA_STS_CDREADY), 0,
> + ECE_POLL_TIMEOUT_US);
> +
> + if (ret) {
> + dev_warn(video->dev, "Wait for ECE_DDA_STS_CDREADY timeout\n");
> + return 0;
> + }
> +
> + size = readl(addr + offset);
> + regmap_read(ece, ECE_HEX_CTRL, &val);
> + gap = FIELD_GET(ECE_HEX_CTRL_ENC_GAP, val);
> +
> + dev_dbg(video->dev, "offset = %u, ed_size = %u, gap = %u\n", offset,
> + size, gap);
> +
> + return size + gap;
> +}
[…]
> +module_platform_driver(npcm_video_driver);
> +
> +MODULE_AUTHOR("Joseph Liu<kwliu@...oton.com>");
> +MODULE_AUTHOR("Marvin Lin<kflin@...oton.com>");
Please add a space before the <.
> +MODULE_DESCRIPTION("Driver for Nuvoton NPCM Video Capture/Encode Engine");
> +MODULE_LICENSE("GPL");
Not GPL v2?
Kind regards,
Paul
[1]: https://notabs.org/coding/smallIntsBigPenalty.htm
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