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40e1a70b4a
This adds a USB display driver with the intention that it can be used with future USB interfaced low end displays/adapters. The Linux gadget device driver will serve as the canonical device implementation. The following DRM properties are supported: - Plane rotation - Connector TV properties There is also support for backlight brightness exposed as a backlight device. Display modes can be made available to the host driver either as DRM display modes or through EDID. If both are present, EDID is just passed on to userspace. Performance is preferred over color depth, so if the device supports RGB565, DRM_CAP_DUMB_PREFERRED_DEPTH will return 16. If the device transfer buffer can't fit an uncompressed framebuffer update, the update is split up into parts that do fit. Optimal user experience is achieved by providing damage reports either by setting FB_DAMAGE_CLIPS on pageflips or calling DRM_IOCTL_MODE_DIRTYFB. LZ4 compression is used if the device supports it. The driver supports a one bit monochrome transfer format: R1. This is not implemented in the gadget driver. It is added in preparation for future monochrome e-ink displays. The driver is MIT licensed to smooth the path for any BSD port of the driver. v2: - Use devm_drm_dev_alloc() and drmm_mode_config_init() - drm_fbdev_generic_setup: Use preferred_bpp=0, 16 was a copy paste error - The drm_backlight_helper is dropped, copy in the code - Support protocol version backwards compatibility for device v3: - Use donated Openmoko USB pid - Use direct compression from framebuffer when pitch matches, not only on full frames, so split updates can benefit - Use __le16 in struct gud_drm_req_get_connector_status - Set edid property when the device only provides edid - Clear compression fields in struct gud_drm_req_set_buffer - Fix protocol version negotiation - Remove mode->vrefresh, it's calculated v4: - Drop the status req polling which was a workaround for something that turned out to be a dwc2 udc driver problem - Add a flag for the Linux gadget to require a status request on SET operations. Other devices will only get status req on STALL errors - Use protocol specific error codes (Peter) - Add a flag for devices that want to receive the entire framebuffer on each flush (Lubomir) - Retry a failed framebuffer flush - If mode has changed wait for worker and clear pending damage before queuing up new damage, fb width/height might have changed - Increase error counter on bulk transfer failures - Use DRM_MODE_CONNECTOR_USB - Handle R1 kmalloc error (Peter) - Don't try and replicate the USB get descriptor request standard for the display descriptor (Peter) - Make max_buffer_size optional (Peter), drop the pow2 requirement since it's not necessary anymore. - Don't pre-alloc a control request buffer, it was only 4k - Let gud.h describe the whole protocol explicitly and don't let DRM leak into it (Peter) - Drop display mode .hskew and .vscan from the protocol - Shorten names: s/GUD_DRM_/GUD_/ s/gud_drm_/gud_/ (Peter) - Fix gud_pipe_check() connector picking when switching connector - Drop gud_drm_driver_gem_create_object() cached is default now - Retrieve USB device from struct drm_device.dev instead of keeping a pointer - Honour fb->offsets[0] - Fix mode fetching when connector status is forced - Check EDID length reported by the device - Use drm_do_get_edid() so userspace can overrride EDID - Set epoch counter to signal connector status change - gud_drm_driver can be const now v5: - GUD_DRM_FORMAT_R1: Use non-human ascii values (Daniel) - Change name to: GUD USB Display (Thomas, Simon) - Change one __u32 -> __le32 in protocol header - Always log fb flush errors, unless the previous one failed - Run backlight update in a worker to avoid upsetting lockdep (Daniel) - Drop backlight_ops.get_brightness, there's no readback from the device so it doesn't really add anything. - Set dma mask, needed by dma-buf importers v6: - Use obj-y in Makefile (Peter) - Fix missing le32_to_cpu() when using GUD_DISPLAY_MAGIC (Peter) - Set initial brightness on backlight device v7: - LZ4_compress_default() can return zero, check for that - Fix memory leak in gud_pipe_check() error path (Peter) - Improve debug and error messages (Peter) - Don't pass length in protocol structs (Peter) - Pass USB interface to gud_usb_control_msg() et al. (Peter) - Improve gud_connector_fill_properties() (Peter) - Add GUD_PIXEL_FORMAT_RGB111 (Peter) - Remove GUD_REQ_SET_VERSION (Peter) - Fix DRM_IOCTL_MODE_OBJ_SETPROPERTY and the rotation property - Fix dma-buf import (Thomas) v8: - Forgot to filter RGB111 from reaching userspace - Handle a device that only returns unknown device properties (Peter) - s/GUD_PIXEL_FORMAT_RGB111/GUD_PIXEL_FORMAT_XRGB1111/ (Peter) - Fix R1 and XRGB1111 format conversion - Add FIXME about Big Endian being broken (Peter, Ilia) Cc: Lubomir Rintel <lkundrak@v3.sk> Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch> Reviewed-by: Peter Stuge <peter@stuge.se> Tested-by: Peter Stuge <peter@stuge.se> Signed-off-by: Noralf Trønnes <noralf@tronnes.org> Link: https://patchwork.freedesktop.org/patch/msgid/20210313112545.37527-4-noralf@tronnes.org
333 lines
12 KiB
C
333 lines
12 KiB
C
/* SPDX-License-Identifier: MIT */
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/*
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* Copyright 2020 Noralf Trønnes
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*/
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#ifndef __LINUX_GUD_H
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#define __LINUX_GUD_H
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#include <linux/types.h>
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/*
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* struct gud_display_descriptor_req - Display descriptor
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* @magic: Magic value GUD_DISPLAY_MAGIC
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* @version: Protocol version
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* @flags: Flags
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* - STATUS_ON_SET: Always do a status request after a SET request.
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* This is used by the Linux gadget driver since it has
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* no way to control the status stage of a control OUT
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* request that has a payload.
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* - FULL_UPDATE: Always send the entire framebuffer when flushing changes.
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* The GUD_REQ_SET_BUFFER request will not be sent
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* before each bulk transfer, it will only be sent if the
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* previous bulk transfer had failed. This gives the device
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* a chance to reset its state machine if needed.
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* This flag can not be used in combination with compression.
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* @compression: Supported compression types
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* - GUD_COMPRESSION_LZ4: LZ4 lossless compression.
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* @max_buffer_size: Maximum buffer size the device can handle (optional).
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* This is useful for devices that don't have a big enough
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* buffer to decompress the entire framebuffer in one go.
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* @min_width: Minimum pixel width the controller can handle
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* @max_width: Maximum width
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* @min_height: Minimum height
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* @max_height: Maximum height
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*
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* Devices that have only one display mode will have min_width == max_width
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* and min_height == max_height.
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*/
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struct gud_display_descriptor_req {
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__le32 magic;
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#define GUD_DISPLAY_MAGIC 0x1d50614d
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__u8 version;
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__le32 flags;
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#define GUD_DISPLAY_FLAG_STATUS_ON_SET BIT(0)
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#define GUD_DISPLAY_FLAG_FULL_UPDATE BIT(1)
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__u8 compression;
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#define GUD_COMPRESSION_LZ4 BIT(0)
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__le32 max_buffer_size;
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__le32 min_width;
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__le32 max_width;
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__le32 min_height;
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__le32 max_height;
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} __packed;
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/*
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* struct gud_property_req - Property
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* @prop: Property
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* @val: Value
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*/
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struct gud_property_req {
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__le16 prop;
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__le64 val;
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} __packed;
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/*
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* struct gud_display_mode_req - Display mode
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* @clock: Pixel clock in kHz
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* @hdisplay: Horizontal display size
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* @hsync_start: Horizontal sync start
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* @hsync_end: Horizontal sync end
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* @htotal: Horizontal total size
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* @vdisplay: Vertical display size
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* @vsync_start: Vertical sync start
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* @vsync_end: Vertical sync end
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* @vtotal: Vertical total size
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* @flags: Bits 0-13 are the same as in the RandR protocol and also what DRM uses.
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* The deprecated bits are reused for internal protocol flags leaving us
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* free to follow DRM for the other bits in the future.
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* - FLAG_PREFERRED: Set on the preferred display mode.
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*/
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struct gud_display_mode_req {
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__le32 clock;
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__le16 hdisplay;
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__le16 hsync_start;
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__le16 hsync_end;
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__le16 htotal;
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__le16 vdisplay;
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__le16 vsync_start;
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__le16 vsync_end;
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__le16 vtotal;
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__le32 flags;
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#define GUD_DISPLAY_MODE_FLAG_PHSYNC BIT(0)
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#define GUD_DISPLAY_MODE_FLAG_NHSYNC BIT(1)
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#define GUD_DISPLAY_MODE_FLAG_PVSYNC BIT(2)
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#define GUD_DISPLAY_MODE_FLAG_NVSYNC BIT(3)
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#define GUD_DISPLAY_MODE_FLAG_INTERLACE BIT(4)
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#define GUD_DISPLAY_MODE_FLAG_DBLSCAN BIT(5)
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#define GUD_DISPLAY_MODE_FLAG_CSYNC BIT(6)
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#define GUD_DISPLAY_MODE_FLAG_PCSYNC BIT(7)
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#define GUD_DISPLAY_MODE_FLAG_NCSYNC BIT(8)
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#define GUD_DISPLAY_MODE_FLAG_HSKEW BIT(9)
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/* BCast and PixelMultiplex are deprecated */
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#define GUD_DISPLAY_MODE_FLAG_DBLCLK BIT(12)
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#define GUD_DISPLAY_MODE_FLAG_CLKDIV2 BIT(13)
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#define GUD_DISPLAY_MODE_FLAG_USER_MASK \
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(GUD_DISPLAY_MODE_FLAG_PHSYNC | GUD_DISPLAY_MODE_FLAG_NHSYNC | \
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GUD_DISPLAY_MODE_FLAG_PVSYNC | GUD_DISPLAY_MODE_FLAG_NVSYNC | \
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GUD_DISPLAY_MODE_FLAG_INTERLACE | GUD_DISPLAY_MODE_FLAG_DBLSCAN | \
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GUD_DISPLAY_MODE_FLAG_CSYNC | GUD_DISPLAY_MODE_FLAG_PCSYNC | \
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GUD_DISPLAY_MODE_FLAG_NCSYNC | GUD_DISPLAY_MODE_FLAG_HSKEW | \
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GUD_DISPLAY_MODE_FLAG_DBLCLK | GUD_DISPLAY_MODE_FLAG_CLKDIV2)
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/* Internal protocol flags */
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#define GUD_DISPLAY_MODE_FLAG_PREFERRED BIT(10)
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} __packed;
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/*
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* struct gud_connector_descriptor_req - Connector descriptor
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* @connector_type: Connector type (GUD_CONNECTOR_TYPE_*).
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* If the host doesn't support the type it should fall back to PANEL.
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* @flags: Flags
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* - POLL_STATUS: Connector status can change (polled every 10 seconds)
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* - INTERLACE: Interlaced modes are supported
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* - DOUBLESCAN: Doublescan modes are supported
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*/
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struct gud_connector_descriptor_req {
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__u8 connector_type;
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#define GUD_CONNECTOR_TYPE_PANEL 0
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#define GUD_CONNECTOR_TYPE_VGA 1
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#define GUD_CONNECTOR_TYPE_COMPOSITE 2
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#define GUD_CONNECTOR_TYPE_SVIDEO 3
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#define GUD_CONNECTOR_TYPE_COMPONENT 4
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#define GUD_CONNECTOR_TYPE_DVI 5
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#define GUD_CONNECTOR_TYPE_DISPLAYPORT 6
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#define GUD_CONNECTOR_TYPE_HDMI 7
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__le32 flags;
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#define GUD_CONNECTOR_FLAGS_POLL_STATUS BIT(0)
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#define GUD_CONNECTOR_FLAGS_INTERLACE BIT(1)
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#define GUD_CONNECTOR_FLAGS_DOUBLESCAN BIT(2)
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} __packed;
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/*
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* struct gud_set_buffer_req - Set buffer transfer info
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* @x: X position of rectangle
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* @y: Y position
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* @width: Pixel width of rectangle
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* @height: Pixel height
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* @length: Buffer length in bytes
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* @compression: Transfer compression
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* @compressed_length: Compressed buffer length
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*
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* This request is issued right before the bulk transfer.
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* @x, @y, @width and @height specifies the rectangle where the buffer should be
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* placed inside the framebuffer.
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*/
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struct gud_set_buffer_req {
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__le32 x;
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__le32 y;
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__le32 width;
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__le32 height;
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__le32 length;
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__u8 compression;
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__le32 compressed_length;
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} __packed;
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/*
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* struct gud_state_req - Display state
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* @mode: Display mode
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* @format: Pixel format GUD_PIXEL_FORMAT_*
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* @connector: Connector index
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* @properties: Array of properties
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*
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* The entire state is transferred each time there's a change.
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*/
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struct gud_state_req {
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struct gud_display_mode_req mode;
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__u8 format;
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__u8 connector;
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struct gud_property_req properties[];
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} __packed;
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/* List of supported connector properties: */
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/* Margins in pixels to deal with overscan, range 0-100 */
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#define GUD_PROPERTY_TV_LEFT_MARGIN 1
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#define GUD_PROPERTY_TV_RIGHT_MARGIN 2
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#define GUD_PROPERTY_TV_TOP_MARGIN 3
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#define GUD_PROPERTY_TV_BOTTOM_MARGIN 4
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#define GUD_PROPERTY_TV_MODE 5
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/* Brightness in percent, range 0-100 */
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#define GUD_PROPERTY_TV_BRIGHTNESS 6
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/* Contrast in percent, range 0-100 */
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#define GUD_PROPERTY_TV_CONTRAST 7
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/* Flicker reduction in percent, range 0-100 */
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#define GUD_PROPERTY_TV_FLICKER_REDUCTION 8
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/* Overscan in percent, range 0-100 */
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#define GUD_PROPERTY_TV_OVERSCAN 9
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/* Saturation in percent, range 0-100 */
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#define GUD_PROPERTY_TV_SATURATION 10
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/* Hue in percent, range 0-100 */
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#define GUD_PROPERTY_TV_HUE 11
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/*
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* Backlight brightness is in the range 0-100 inclusive. The value represents the human perceptual
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* brightness and not a linear PWM value. 0 is minimum brightness which should not turn the
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* backlight completely off. The DPMS connector property should be used to control power which will
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* trigger a GUD_REQ_SET_DISPLAY_ENABLE request.
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*
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* This does not map to a DRM property, it is used with the backlight device.
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*/
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#define GUD_PROPERTY_BACKLIGHT_BRIGHTNESS 12
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/* List of supported properties that are not connector propeties: */
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/*
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* Plane rotation. Should return the supported bitmask on
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* GUD_REQ_GET_PROPERTIES. GUD_ROTATION_0 is mandatory.
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*
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* Note: This is not display rotation so 90/270 will need scaling to make it fit (unless squared).
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*/
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#define GUD_PROPERTY_ROTATION 50
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#define GUD_ROTATION_0 BIT(0)
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#define GUD_ROTATION_90 BIT(1)
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#define GUD_ROTATION_180 BIT(2)
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#define GUD_ROTATION_270 BIT(3)
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#define GUD_ROTATION_REFLECT_X BIT(4)
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#define GUD_ROTATION_REFLECT_Y BIT(5)
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#define GUD_ROTATION_MASK (GUD_ROTATION_0 | GUD_ROTATION_90 | \
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GUD_ROTATION_180 | GUD_ROTATION_270 | \
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GUD_ROTATION_REFLECT_X | GUD_ROTATION_REFLECT_Y)
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/* USB Control requests: */
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/* Get status from the last GET/SET control request. Value is u8. */
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#define GUD_REQ_GET_STATUS 0x00
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/* Status values: */
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#define GUD_STATUS_OK 0x00
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#define GUD_STATUS_BUSY 0x01
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#define GUD_STATUS_REQUEST_NOT_SUPPORTED 0x02
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#define GUD_STATUS_PROTOCOL_ERROR 0x03
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#define GUD_STATUS_INVALID_PARAMETER 0x04
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#define GUD_STATUS_ERROR 0x05
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/* Get display descriptor as a &gud_display_descriptor_req */
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#define GUD_REQ_GET_DESCRIPTOR 0x01
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/* Get supported pixel formats as a byte array of GUD_PIXEL_FORMAT_* */
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#define GUD_REQ_GET_FORMATS 0x40
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#define GUD_FORMATS_MAX_NUM 32
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/* R1 is a 1-bit monochrome transfer format presented to userspace as XRGB8888 */
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#define GUD_PIXEL_FORMAT_R1 0x01
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#define GUD_PIXEL_FORMAT_XRGB1111 0x20
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#define GUD_PIXEL_FORMAT_RGB565 0x40
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#define GUD_PIXEL_FORMAT_XRGB8888 0x80
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#define GUD_PIXEL_FORMAT_ARGB8888 0x81
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/*
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* Get supported properties that are not connector propeties as a &gud_property_req array.
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* gud_property_req.val often contains the initial value for the property.
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*/
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#define GUD_REQ_GET_PROPERTIES 0x41
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#define GUD_PROPERTIES_MAX_NUM 32
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/* Connector requests have the connector index passed in the wValue field */
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/* Get connector descriptors as an array of &gud_connector_descriptor_req */
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#define GUD_REQ_GET_CONNECTORS 0x50
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#define GUD_CONNECTORS_MAX_NUM 32
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/*
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* Get properties supported by the connector as a &gud_property_req array.
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* gud_property_req.val often contains the initial value for the property.
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*/
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#define GUD_REQ_GET_CONNECTOR_PROPERTIES 0x51
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#define GUD_CONNECTOR_PROPERTIES_MAX_NUM 32
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/*
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* Issued when there's a TV_MODE property present.
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* Gets an array of the supported TV_MODE names each entry of length
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* GUD_CONNECTOR_TV_MODE_NAME_LEN. Names must be NUL-terminated.
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*/
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#define GUD_REQ_GET_CONNECTOR_TV_MODE_VALUES 0x52
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#define GUD_CONNECTOR_TV_MODE_NAME_LEN 16
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#define GUD_CONNECTOR_TV_MODE_MAX_NUM 16
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/* When userspace checks connector status, this is issued first, not used for poll requests. */
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#define GUD_REQ_SET_CONNECTOR_FORCE_DETECT 0x53
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/*
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* Get connector status. Value is u8.
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*
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* Userspace will get a HOTPLUG uevent if one of the following is true:
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* - Connection status has changed since last
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* - CHANGED is set
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*/
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#define GUD_REQ_GET_CONNECTOR_STATUS 0x54
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#define GUD_CONNECTOR_STATUS_DISCONNECTED 0x00
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#define GUD_CONNECTOR_STATUS_CONNECTED 0x01
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#define GUD_CONNECTOR_STATUS_UNKNOWN 0x02
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#define GUD_CONNECTOR_STATUS_CONNECTED_MASK 0x03
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#define GUD_CONNECTOR_STATUS_CHANGED BIT(7)
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/*
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* Display modes can be fetched as either EDID data or an array of &gud_display_mode_req.
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*
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* If GUD_REQ_GET_CONNECTOR_MODES returns zero, EDID is used to create display modes.
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* If both display modes and EDID are returned, EDID is just passed on to userspace
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* in the EDID connector property.
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*/
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/* Get &gud_display_mode_req array of supported display modes */
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#define GUD_REQ_GET_CONNECTOR_MODES 0x55
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#define GUD_CONNECTOR_MAX_NUM_MODES 128
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/* Get Extended Display Identification Data */
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#define GUD_REQ_GET_CONNECTOR_EDID 0x56
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#define GUD_CONNECTOR_MAX_EDID_LEN 2048
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/* Set buffer properties before bulk transfer as &gud_set_buffer_req */
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#define GUD_REQ_SET_BUFFER 0x60
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/* Check display configuration as &gud_state_req */
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#define GUD_REQ_SET_STATE_CHECK 0x61
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/* Apply the previous STATE_CHECK configuration */
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#define GUD_REQ_SET_STATE_COMMIT 0x62
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/* Enable/disable the display controller, value is u8: 0/1 */
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#define GUD_REQ_SET_CONTROLLER_ENABLE 0x63
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/* Enable/disable display/output (DPMS), value is u8: 0/1 */
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#define GUD_REQ_SET_DISPLAY_ENABLE 0x64
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#endif
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