Create a new file for the DRM backend's handling of output modes, e.g. resolution, aspect ratio, preferred mode selection, EDID parsing. Signed-off-by: Daniel Stone <daniels@collabora.com>dev
Daniel Stone
6 years ago
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3448cfce0f
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fbe6c1db7b
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/*
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* Copyright © 2008-2011 Kristian Høgsberg |
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* Copyright © 2011 Intel Corporation |
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* Copyright © 2017, 2018 Collabora, Ltd. |
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* Copyright © 2017, 2018 General Electric Company |
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* Copyright (c) 2018 DisplayLink (UK) Ltd. |
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* |
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* Permission is hereby granted, free of charge, to any person obtaining |
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* a copy of this software and associated documentation files (the |
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* "Software"), to deal in the Software without restriction, including |
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* without limitation the rights to use, copy, modify, merge, publish, |
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* distribute, sublicense, and/or sell copies of the Software, and to |
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* permit persons to whom the Software is furnished to do so, subject to |
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* the following conditions: |
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* |
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* The above copyright notice and this permission notice (including the |
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* next paragraph) shall be included in all copies or substantial |
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* portions of the Software. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS |
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN |
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
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* SOFTWARE. |
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*/ |
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#include "config.h" |
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#include <xf86drm.h> |
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#include <xf86drmMode.h> |
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#include <drm_fourcc.h> |
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#include "drm-internal.h" |
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static const char *const aspect_ratio_as_string[] = { |
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[WESTON_MODE_PIC_AR_NONE] = "", |
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[WESTON_MODE_PIC_AR_4_3] = " 4:3", |
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[WESTON_MODE_PIC_AR_16_9] = " 16:9", |
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[WESTON_MODE_PIC_AR_64_27] = " 64:27", |
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[WESTON_MODE_PIC_AR_256_135] = " 256:135", |
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}; |
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/*
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* Get the aspect-ratio from drmModeModeInfo mode flags. |
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* |
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* @param drm_mode_flags- flags from drmModeModeInfo structure. |
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* @returns aspect-ratio as encoded in enum 'weston_mode_aspect_ratio'. |
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*/ |
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static enum weston_mode_aspect_ratio |
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drm_to_weston_mode_aspect_ratio(uint32_t drm_mode_flags) |
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{ |
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return (drm_mode_flags & DRM_MODE_FLAG_PIC_AR_MASK) >> |
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DRM_MODE_FLAG_PIC_AR_BITS_POS; |
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} |
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static const char * |
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aspect_ratio_to_string(enum weston_mode_aspect_ratio ratio) |
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{ |
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if (ratio < 0 || ratio >= ARRAY_LENGTH(aspect_ratio_as_string) || |
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!aspect_ratio_as_string[ratio]) |
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return " (unknown aspect ratio)"; |
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return aspect_ratio_as_string[ratio]; |
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} |
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static int |
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drm_subpixel_to_wayland(int drm_value) |
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{ |
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switch (drm_value) { |
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default: |
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case DRM_MODE_SUBPIXEL_UNKNOWN: |
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return WL_OUTPUT_SUBPIXEL_UNKNOWN; |
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case DRM_MODE_SUBPIXEL_NONE: |
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return WL_OUTPUT_SUBPIXEL_NONE; |
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case DRM_MODE_SUBPIXEL_HORIZONTAL_RGB: |
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return WL_OUTPUT_SUBPIXEL_HORIZONTAL_RGB; |
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case DRM_MODE_SUBPIXEL_HORIZONTAL_BGR: |
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return WL_OUTPUT_SUBPIXEL_HORIZONTAL_BGR; |
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case DRM_MODE_SUBPIXEL_VERTICAL_RGB: |
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return WL_OUTPUT_SUBPIXEL_VERTICAL_RGB; |
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case DRM_MODE_SUBPIXEL_VERTICAL_BGR: |
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return WL_OUTPUT_SUBPIXEL_VERTICAL_BGR; |
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} |
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} |
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int |
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drm_mode_ensure_blob(struct drm_backend *backend, struct drm_mode *mode) |
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{ |
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int ret; |
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if (mode->blob_id) |
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return 0; |
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ret = drmModeCreatePropertyBlob(backend->drm.fd, |
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&mode->mode_info, |
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sizeof(mode->mode_info), |
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&mode->blob_id); |
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if (ret != 0) |
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weston_log("failed to create mode property blob: %s\n", |
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strerror(errno)); |
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drm_debug(backend, "\t\t\t[atomic] created new mode blob %lu for %s\n", |
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(unsigned long) mode->blob_id, mode->mode_info.name); |
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return ret; |
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} |
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static bool |
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check_non_desktop(struct drm_head *head, drmModeObjectPropertiesPtr props) |
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{ |
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struct drm_property_info *non_desktop_info = |
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&head->props_conn[WDRM_CONNECTOR_NON_DESKTOP]; |
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return drm_property_get_value(non_desktop_info, props, 0); |
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} |
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static int |
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parse_modeline(const char *s, drmModeModeInfo *mode) |
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{ |
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char hsync[16]; |
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char vsync[16]; |
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float fclock; |
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memset(mode, 0, sizeof *mode); |
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mode->type = DRM_MODE_TYPE_USERDEF; |
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mode->hskew = 0; |
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mode->vscan = 0; |
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mode->vrefresh = 0; |
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mode->flags = 0; |
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if (sscanf(s, "%f %hd %hd %hd %hd %hd %hd %hd %hd %15s %15s", |
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&fclock, |
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&mode->hdisplay, |
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&mode->hsync_start, |
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&mode->hsync_end, |
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&mode->htotal, |
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&mode->vdisplay, |
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&mode->vsync_start, |
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&mode->vsync_end, |
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&mode->vtotal, hsync, vsync) != 11) |
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return -1; |
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mode->clock = fclock * 1000; |
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if (strcasecmp(hsync, "+hsync") == 0) |
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mode->flags |= DRM_MODE_FLAG_PHSYNC; |
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else if (strcasecmp(hsync, "-hsync") == 0) |
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mode->flags |= DRM_MODE_FLAG_NHSYNC; |
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else |
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return -1; |
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if (strcasecmp(vsync, "+vsync") == 0) |
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mode->flags |= DRM_MODE_FLAG_PVSYNC; |
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else if (strcasecmp(vsync, "-vsync") == 0) |
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mode->flags |= DRM_MODE_FLAG_NVSYNC; |
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else |
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return -1; |
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snprintf(mode->name, sizeof mode->name, "%dx%d@%.3f", |
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mode->hdisplay, mode->vdisplay, fclock); |
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return 0; |
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} |
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static void |
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edid_parse_string(const uint8_t *data, char text[]) |
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{ |
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int i; |
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int replaced = 0; |
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/* this is always 12 bytes, but we can't guarantee it's null
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* terminated or not junk. */ |
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strncpy(text, (const char *) data, 12); |
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/* guarantee our new string is null-terminated */ |
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text[12] = '\0'; |
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/* remove insane chars */ |
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for (i = 0; text[i] != '\0'; i++) { |
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if (text[i] == '\n' || |
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text[i] == '\r') { |
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text[i] = '\0'; |
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break; |
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} |
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} |
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/* ensure string is printable */ |
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for (i = 0; text[i] != '\0'; i++) { |
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if (!isprint(text[i])) { |
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text[i] = '-'; |
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replaced++; |
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} |
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} |
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/* if the string is random junk, ignore the string */ |
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if (replaced > 4) |
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text[0] = '\0'; |
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} |
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#define EDID_DESCRIPTOR_ALPHANUMERIC_DATA_STRING 0xfe |
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#define EDID_DESCRIPTOR_DISPLAY_PRODUCT_NAME 0xfc |
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#define EDID_DESCRIPTOR_DISPLAY_PRODUCT_SERIAL_NUMBER 0xff |
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#define EDID_OFFSET_DATA_BLOCKS 0x36 |
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#define EDID_OFFSET_LAST_BLOCK 0x6c |
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#define EDID_OFFSET_PNPID 0x08 |
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#define EDID_OFFSET_SERIAL 0x0c |
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static int |
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edid_parse(struct drm_edid *edid, const uint8_t *data, size_t length) |
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{ |
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int i; |
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uint32_t serial_number; |
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/* check header */ |
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if (length < 128) |
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return -1; |
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if (data[0] != 0x00 || data[1] != 0xff) |
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return -1; |
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/* decode the PNP ID from three 5 bit words packed into 2 bytes
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* /--08--\/--09--\
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* 7654321076543210 |
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* |\---/\---/\---/ |
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* R C1 C2 C3 */ |
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edid->pnp_id[0] = 'A' + ((data[EDID_OFFSET_PNPID + 0] & 0x7c) / 4) - 1; |
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edid->pnp_id[1] = 'A' + ((data[EDID_OFFSET_PNPID + 0] & 0x3) * 8) + ((data[EDID_OFFSET_PNPID + 1] & 0xe0) / 32) - 1; |
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edid->pnp_id[2] = 'A' + (data[EDID_OFFSET_PNPID + 1] & 0x1f) - 1; |
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edid->pnp_id[3] = '\0'; |
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/* maybe there isn't a ASCII serial number descriptor, so use this instead */ |
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serial_number = (uint32_t) data[EDID_OFFSET_SERIAL + 0]; |
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serial_number += (uint32_t) data[EDID_OFFSET_SERIAL + 1] * 0x100; |
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serial_number += (uint32_t) data[EDID_OFFSET_SERIAL + 2] * 0x10000; |
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serial_number += (uint32_t) data[EDID_OFFSET_SERIAL + 3] * 0x1000000; |
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if (serial_number > 0) |
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sprintf(edid->serial_number, "%lu", (unsigned long) serial_number); |
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/* parse EDID data */ |
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for (i = EDID_OFFSET_DATA_BLOCKS; |
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i <= EDID_OFFSET_LAST_BLOCK; |
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i += 18) { |
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/* ignore pixel clock data */ |
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if (data[i] != 0) |
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continue; |
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if (data[i+2] != 0) |
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continue; |
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/* any useful blocks? */ |
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if (data[i+3] == EDID_DESCRIPTOR_DISPLAY_PRODUCT_NAME) { |
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edid_parse_string(&data[i+5], |
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edid->monitor_name); |
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} else if (data[i+3] == EDID_DESCRIPTOR_DISPLAY_PRODUCT_SERIAL_NUMBER) { |
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edid_parse_string(&data[i+5], |
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edid->serial_number); |
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} else if (data[i+3] == EDID_DESCRIPTOR_ALPHANUMERIC_DATA_STRING) { |
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edid_parse_string(&data[i+5], |
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edid->eisa_id); |
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} |
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} |
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return 0; |
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} |
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/** Parse monitor make, model and serial from EDID
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* |
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* \param head The head whose \c drm_edid to fill in. |
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* \param props The DRM connector properties to get the EDID from. |
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* \param[out] make The monitor make (PNP ID). |
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* \param[out] model The monitor model (name). |
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* \param[out] serial_number The monitor serial number. |
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* |
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* Each of \c *make, \c *model and \c *serial_number are set only if the |
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* information is found in the EDID. The pointers they are set to must not |
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* be free()'d explicitly, instead they get implicitly freed when the |
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* \c drm_head is destroyed. |
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*/ |
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static void |
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find_and_parse_output_edid(struct drm_head *head, |
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drmModeObjectPropertiesPtr props, |
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const char **make, |
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const char **model, |
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const char **serial_number) |
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{ |
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drmModePropertyBlobPtr edid_blob = NULL; |
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uint32_t blob_id; |
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int rc; |
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blob_id = |
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drm_property_get_value(&head->props_conn[WDRM_CONNECTOR_EDID], |
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props, 0); |
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if (!blob_id) |
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return; |
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edid_blob = drmModeGetPropertyBlob(head->backend->drm.fd, blob_id); |
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if (!edid_blob) |
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return; |
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rc = edid_parse(&head->edid, |
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edid_blob->data, |
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edid_blob->length); |
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if (!rc) { |
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if (head->edid.pnp_id[0] != '\0') |
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*make = head->edid.pnp_id; |
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if (head->edid.monitor_name[0] != '\0') |
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*model = head->edid.monitor_name; |
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if (head->edid.serial_number[0] != '\0') |
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*serial_number = head->edid.serial_number; |
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} |
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drmModeFreePropertyBlob(edid_blob); |
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} |
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static uint32_t |
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drm_refresh_rate_mHz(const drmModeModeInfo *info) |
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{ |
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uint64_t refresh; |
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/* Calculate higher precision (mHz) refresh rate */ |
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refresh = (info->clock * 1000000LL / info->htotal + |
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info->vtotal / 2) / info->vtotal; |
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if (info->flags & DRM_MODE_FLAG_INTERLACE) |
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refresh *= 2; |
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if (info->flags & DRM_MODE_FLAG_DBLSCAN) |
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refresh /= 2; |
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if (info->vscan > 1) |
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refresh /= info->vscan; |
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return refresh; |
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} |
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/**
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* Add a mode to output's mode list |
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* |
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* Copy the supplied DRM mode into a Weston mode structure, and add it to the |
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* output's mode list. |
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* |
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* @param output DRM output to add mode to |
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* @param info DRM mode structure to add |
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* @returns Newly-allocated Weston/DRM mode structure |
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*/ |
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static struct drm_mode * |
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drm_output_add_mode(struct drm_output *output, const drmModeModeInfo *info) |
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{ |
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struct drm_mode *mode; |
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mode = malloc(sizeof *mode); |
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if (mode == NULL) |
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return NULL; |
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mode->base.flags = 0; |
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mode->base.width = info->hdisplay; |
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mode->base.height = info->vdisplay; |
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mode->base.refresh = drm_refresh_rate_mHz(info); |
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mode->mode_info = *info; |
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mode->blob_id = 0; |
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if (info->type & DRM_MODE_TYPE_PREFERRED) |
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mode->base.flags |= WL_OUTPUT_MODE_PREFERRED; |
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mode->base.aspect_ratio = drm_to_weston_mode_aspect_ratio(info->flags); |
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wl_list_insert(output->base.mode_list.prev, &mode->base.link); |
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return mode; |
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} |
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/**
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* Destroys a mode, and removes it from the list. |
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*/ |
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static void |
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drm_output_destroy_mode(struct drm_backend *backend, struct drm_mode *mode) |
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{ |
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if (mode->blob_id) |
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drmModeDestroyPropertyBlob(backend->drm.fd, mode->blob_id); |
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wl_list_remove(&mode->base.link); |
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free(mode); |
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} |
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/** Destroy a list of drm_modes
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* |
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* @param backend The backend for releasing mode property blobs. |
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* @param mode_list The list linked by drm_mode::base.link. |
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*/ |
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void |
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drm_mode_list_destroy(struct drm_backend *backend, struct wl_list *mode_list) |
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{ |
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struct drm_mode *mode, *next; |
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wl_list_for_each_safe(mode, next, mode_list, base.link) |
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drm_output_destroy_mode(backend, mode); |
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} |
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void |
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drm_output_print_modes(struct drm_output *output) |
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{ |
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struct weston_mode *m; |
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struct drm_mode *dm; |
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const char *aspect_ratio; |
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wl_list_for_each(m, &output->base.mode_list, link) { |
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dm = to_drm_mode(m); |
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aspect_ratio = aspect_ratio_to_string(m->aspect_ratio); |
||||||
|
weston_log_continue(STAMP_SPACE "%dx%d@%.1f%s%s%s, %.1f MHz\n", |
||||||
|
m->width, m->height, m->refresh / 1000.0, |
||||||
|
aspect_ratio, |
||||||
|
m->flags & WL_OUTPUT_MODE_PREFERRED ? |
||||||
|
", preferred" : "", |
||||||
|
m->flags & WL_OUTPUT_MODE_CURRENT ? |
||||||
|
", current" : "", |
||||||
|
dm->mode_info.clock / 1000.0); |
||||||
|
} |
||||||
|
} |
||||||
|
|
||||||
|
|
||||||
|
/**
|
||||||
|
* Find the closest-matching mode for a given target |
||||||
|
* |
||||||
|
* Given a target mode, find the most suitable mode amongst the output's |
||||||
|
* current mode list to use, preferring the current mode if possible, to |
||||||
|
* avoid an expensive mode switch. |
||||||
|
* |
||||||
|
* @param output DRM output |
||||||
|
* @param target_mode Mode to attempt to match |
||||||
|
* @returns Pointer to a mode from the output's mode list |
||||||
|
*/ |
||||||
|
struct drm_mode * |
||||||
|
drm_output_choose_mode(struct drm_output *output, |
||||||
|
struct weston_mode *target_mode) |
||||||
|
{ |
||||||
|
struct drm_mode *tmp_mode = NULL, *mode_fall_back = NULL, *mode; |
||||||
|
enum weston_mode_aspect_ratio src_aspect = WESTON_MODE_PIC_AR_NONE; |
||||||
|
enum weston_mode_aspect_ratio target_aspect = WESTON_MODE_PIC_AR_NONE; |
||||||
|
struct drm_backend *b; |
||||||
|
|
||||||
|
b = to_drm_backend(output->base.compositor); |
||||||
|
target_aspect = target_mode->aspect_ratio; |
||||||
|
src_aspect = output->base.current_mode->aspect_ratio; |
||||||
|
if (output->base.current_mode->width == target_mode->width && |
||||||
|
output->base.current_mode->height == target_mode->height && |
||||||
|
(output->base.current_mode->refresh == target_mode->refresh || |
||||||
|
target_mode->refresh == 0)) { |
||||||
|
if (!b->aspect_ratio_supported || src_aspect == target_aspect) |
||||||
|
return to_drm_mode(output->base.current_mode); |
||||||
|
} |
||||||
|
|
||||||
|
wl_list_for_each(mode, &output->base.mode_list, base.link) { |
||||||
|
|
||||||
|
src_aspect = mode->base.aspect_ratio; |
||||||
|
if (mode->mode_info.hdisplay == target_mode->width && |
||||||
|
mode->mode_info.vdisplay == target_mode->height) { |
||||||
|
if (mode->base.refresh == target_mode->refresh || |
||||||
|
target_mode->refresh == 0) { |
||||||
|
if (!b->aspect_ratio_supported || |
||||||
|
src_aspect == target_aspect) |
||||||
|
return mode; |
||||||
|
else if (!mode_fall_back) |
||||||
|
mode_fall_back = mode; |
||||||
|
} else if (!tmp_mode) { |
||||||
|
tmp_mode = mode; |
||||||
|
} |
||||||
|
} |
||||||
|
} |
||||||
|
|
||||||
|
if (mode_fall_back) |
||||||
|
return mode_fall_back; |
||||||
|
|
||||||
|
return tmp_mode; |
||||||
|
} |
||||||
|
|
||||||
|
void |
||||||
|
update_head_from_connector(struct drm_head *head, |
||||||
|
drmModeObjectProperties *props) |
||||||
|
{ |
||||||
|
const char *make = "unknown"; |
||||||
|
const char *model = "unknown"; |
||||||
|
const char *serial_number = "unknown"; |
||||||
|
|
||||||
|
find_and_parse_output_edid(head, props, &make, &model, &serial_number); |
||||||
|
weston_head_set_monitor_strings(&head->base, make, model, serial_number); |
||||||
|
weston_head_set_non_desktop(&head->base, |
||||||
|
check_non_desktop(head, props)); |
||||||
|
weston_head_set_subpixel(&head->base, |
||||||
|
drm_subpixel_to_wayland(head->connector->subpixel)); |
||||||
|
|
||||||
|
weston_head_set_physical_size(&head->base, head->connector->mmWidth, |
||||||
|
head->connector->mmHeight); |
||||||
|
|
||||||
|
/* Unknown connection status is assumed disconnected. */ |
||||||
|
weston_head_set_connection_status(&head->base, |
||||||
|
head->connector->connection == DRM_MODE_CONNECTED); |
||||||
|
} |
||||||
|
|
||||||
|
/**
|
||||||
|
* Choose suitable mode for an output |
||||||
|
* |
||||||
|
* Find the most suitable mode to use for initial setup (or reconfiguration on |
||||||
|
* hotplug etc) for a DRM output. |
||||||
|
* |
||||||
|
* @param backend the DRM backend |
||||||
|
* @param output DRM output to choose mode for |
||||||
|
* @param mode Strategy and preference to use when choosing mode |
||||||
|
* @param modeline Manually-entered mode (may be NULL) |
||||||
|
* @param current_mode Mode currently being displayed on this output |
||||||
|
* @returns A mode from the output's mode list, or NULL if none available |
||||||
|
*/ |
||||||
|
static struct drm_mode * |
||||||
|
drm_output_choose_initial_mode(struct drm_backend *backend, |
||||||
|
struct drm_output *output, |
||||||
|
enum weston_drm_backend_output_mode mode, |
||||||
|
const char *modeline, |
||||||
|
const drmModeModeInfo *current_mode) |
||||||
|
{ |
||||||
|
struct drm_mode *preferred = NULL; |
||||||
|
struct drm_mode *current = NULL; |
||||||
|
struct drm_mode *configured = NULL; |
||||||
|
struct drm_mode *config_fall_back = NULL; |
||||||
|
struct drm_mode *best = NULL; |
||||||
|
struct drm_mode *drm_mode; |
||||||
|
drmModeModeInfo drm_modeline; |
||||||
|
int32_t width = 0; |
||||||
|
int32_t height = 0; |
||||||
|
uint32_t refresh = 0; |
||||||
|
uint32_t aspect_width = 0; |
||||||
|
uint32_t aspect_height = 0; |
||||||
|
enum weston_mode_aspect_ratio aspect_ratio = WESTON_MODE_PIC_AR_NONE; |
||||||
|
int n; |
||||||
|
|
||||||
|
if (mode == WESTON_DRM_BACKEND_OUTPUT_PREFERRED && modeline) { |
||||||
|
n = sscanf(modeline, "%dx%d@%d %u:%u", &width, &height, |
||||||
|
&refresh, &aspect_width, &aspect_height); |
||||||
|
if (backend->aspect_ratio_supported && n == 5) { |
||||||
|
if (aspect_width == 4 && aspect_height == 3) |
||||||
|
aspect_ratio = WESTON_MODE_PIC_AR_4_3; |
||||||
|
else if (aspect_width == 16 && aspect_height == 9) |
||||||
|
aspect_ratio = WESTON_MODE_PIC_AR_16_9; |
||||||
|
else if (aspect_width == 64 && aspect_height == 27) |
||||||
|
aspect_ratio = WESTON_MODE_PIC_AR_64_27; |
||||||
|
else if (aspect_width == 256 && aspect_height == 135) |
||||||
|
aspect_ratio = WESTON_MODE_PIC_AR_256_135; |
||||||
|
else |
||||||
|
weston_log("Invalid modeline \"%s\" for output %s\n", |
||||||
|
modeline, output->base.name); |
||||||
|
} |
||||||
|
if (n != 2 && n != 3 && n != 5) { |
||||||
|
width = -1; |
||||||
|
|
||||||
|
if (parse_modeline(modeline, &drm_modeline) == 0) { |
||||||
|
configured = drm_output_add_mode(output, &drm_modeline); |
||||||
|
if (!configured) |
||||||
|
return NULL; |
||||||
|
} else { |
||||||
|
weston_log("Invalid modeline \"%s\" for output %s\n", |
||||||
|
modeline, output->base.name); |
||||||
|
} |
||||||
|
} |
||||||
|
} |
||||||
|
|
||||||
|
wl_list_for_each_reverse(drm_mode, &output->base.mode_list, base.link) { |
||||||
|
if (width == drm_mode->base.width && |
||||||
|
height == drm_mode->base.height && |
||||||
|
(refresh == 0 || refresh == drm_mode->mode_info.vrefresh)) { |
||||||
|
if (!backend->aspect_ratio_supported || |
||||||
|
aspect_ratio == drm_mode->base.aspect_ratio) |
||||||
|
configured = drm_mode; |
||||||
|
else |
||||||
|
config_fall_back = drm_mode; |
||||||
|
} |
||||||
|
|
||||||
|
if (memcmp(current_mode, &drm_mode->mode_info, |
||||||
|
sizeof *current_mode) == 0) |
||||||
|
current = drm_mode; |
||||||
|
|
||||||
|
if (drm_mode->base.flags & WL_OUTPUT_MODE_PREFERRED) |
||||||
|
preferred = drm_mode; |
||||||
|
|
||||||
|
best = drm_mode; |
||||||
|
} |
||||||
|
|
||||||
|
if (current == NULL && current_mode->clock != 0) { |
||||||
|
current = drm_output_add_mode(output, current_mode); |
||||||
|
if (!current) |
||||||
|
return NULL; |
||||||
|
} |
||||||
|
|
||||||
|
if (mode == WESTON_DRM_BACKEND_OUTPUT_CURRENT) |
||||||
|
configured = current; |
||||||
|
|
||||||
|
if (configured) |
||||||
|
return configured; |
||||||
|
|
||||||
|
if (config_fall_back) |
||||||
|
return config_fall_back; |
||||||
|
|
||||||
|
if (preferred) |
||||||
|
return preferred; |
||||||
|
|
||||||
|
if (current) |
||||||
|
return current; |
||||||
|
|
||||||
|
if (best) |
||||||
|
return best; |
||||||
|
|
||||||
|
weston_log("no available modes for %s\n", output->base.name); |
||||||
|
return NULL; |
||||||
|
} |
||||||
|
|
||||||
|
static uint32_t |
||||||
|
u32distance(uint32_t a, uint32_t b) |
||||||
|
{ |
||||||
|
if (a < b) |
||||||
|
return b - a; |
||||||
|
else |
||||||
|
return a - b; |
||||||
|
} |
||||||
|
|
||||||
|
/** Choose equivalent mode
|
||||||
|
* |
||||||
|
* If the two modes are not equivalent, return NULL. |
||||||
|
* Otherwise return the mode that is more likely to work in place of both. |
||||||
|
* |
||||||
|
* None of the fuzzy matching criteria in this function have any justification. |
||||||
|
* |
||||||
|
* typedef struct _drmModeModeInfo { |
||||||
|
* uint32_t clock; |
||||||
|
* uint16_t hdisplay, hsync_start, hsync_end, htotal, hskew; |
||||||
|
* uint16_t vdisplay, vsync_start, vsync_end, vtotal, vscan; |
||||||
|
* |
||||||
|
* uint32_t vrefresh; |
||||||
|
* |
||||||
|
* uint32_t flags; |
||||||
|
* uint32_t type; |
||||||
|
* char name[DRM_DISPLAY_MODE_LEN]; |
||||||
|
* } drmModeModeInfo, *drmModeModeInfoPtr; |
||||||
|
*/ |
||||||
|
static const drmModeModeInfo * |
||||||
|
drm_mode_pick_equivalent(const drmModeModeInfo *a, const drmModeModeInfo *b) |
||||||
|
{ |
||||||
|
uint32_t refresh_a, refresh_b; |
||||||
|
|
||||||
|
if (a->hdisplay != b->hdisplay || a->vdisplay != b->vdisplay) |
||||||
|
return NULL; |
||||||
|
|
||||||
|
if (a->flags != b->flags) |
||||||
|
return NULL; |
||||||
|
|
||||||
|
/* kHz */ |
||||||
|
if (u32distance(a->clock, b->clock) > 500) |
||||||
|
return NULL; |
||||||
|
|
||||||
|
refresh_a = drm_refresh_rate_mHz(a); |
||||||
|
refresh_b = drm_refresh_rate_mHz(b); |
||||||
|
if (u32distance(refresh_a, refresh_b) > 50) |
||||||
|
return NULL; |
||||||
|
|
||||||
|
if ((a->type ^ b->type) & DRM_MODE_TYPE_PREFERRED) { |
||||||
|
if (a->type & DRM_MODE_TYPE_PREFERRED) |
||||||
|
return a; |
||||||
|
else |
||||||
|
return b; |
||||||
|
} |
||||||
|
|
||||||
|
return a; |
||||||
|
} |
||||||
|
|
||||||
|
/* If the given mode info is not already in the list, add it.
|
||||||
|
* If it is in the list, either keep the existing or replace it, |
||||||
|
* depending on which one is "better". |
||||||
|
*/ |
||||||
|
static int |
||||||
|
drm_output_try_add_mode(struct drm_output *output, const drmModeModeInfo *info) |
||||||
|
{ |
||||||
|
struct weston_mode *base; |
||||||
|
struct drm_mode *mode; |
||||||
|
struct drm_backend *backend; |
||||||
|
const drmModeModeInfo *chosen = NULL; |
||||||
|
|
||||||
|
assert(info); |
||||||
|
|
||||||
|
wl_list_for_each(base, &output->base.mode_list, link) { |
||||||
|
mode = to_drm_mode(base); |
||||||
|
chosen = drm_mode_pick_equivalent(&mode->mode_info, info); |
||||||
|
if (chosen) |
||||||
|
break; |
||||||
|
} |
||||||
|
|
||||||
|
if (chosen == info) { |
||||||
|
backend = to_drm_backend(output->base.compositor); |
||||||
|
drm_output_destroy_mode(backend, mode); |
||||||
|
chosen = NULL; |
||||||
|
} |
||||||
|
|
||||||
|
if (!chosen) { |
||||||
|
mode = drm_output_add_mode(output, info); |
||||||
|
if (!mode) |
||||||
|
return -1; |
||||||
|
} |
||||||
|
/* else { the equivalent mode is already in the list } */ |
||||||
|
|
||||||
|
return 0; |
||||||
|
} |
||||||
|
|
||||||
|
/** Rewrite the output's mode list
|
||||||
|
* |
||||||
|
* @param output The output. |
||||||
|
* @return 0 on success, -1 on failure. |
||||||
|
* |
||||||
|
* Destroy all existing modes in the list, and reconstruct a new list from |
||||||
|
* scratch, based on the currently attached heads. |
||||||
|
* |
||||||
|
* On failure the output's mode list may contain some modes. |
||||||
|
*/ |
||||||
|
static int |
||||||
|
drm_output_update_modelist_from_heads(struct drm_output *output) |
||||||
|
{ |
||||||
|
struct drm_backend *backend = to_drm_backend(output->base.compositor); |
||||||
|
struct weston_head *head_base; |
||||||
|
struct drm_head *head; |
||||||
|
int i; |
||||||
|
int ret; |
||||||
|
|
||||||
|
assert(!output->base.enabled); |
||||||
|
|
||||||
|
drm_mode_list_destroy(backend, &output->base.mode_list); |
||||||
|
|
||||||
|
wl_list_for_each(head_base, &output->base.head_list, output_link) { |
||||||
|
head = to_drm_head(head_base); |
||||||
|
for (i = 0; i < head->connector->count_modes; i++) { |
||||||
|
ret = drm_output_try_add_mode(output, |
||||||
|
&head->connector->modes[i]); |
||||||
|
if (ret < 0) |
||||||
|
return -1; |
||||||
|
} |
||||||
|
} |
||||||
|
|
||||||
|
return 0; |
||||||
|
} |
||||||
|
|
||||||
|
int |
||||||
|
drm_output_set_mode(struct weston_output *base, |
||||||
|
enum weston_drm_backend_output_mode mode, |
||||||
|
const char *modeline) |
||||||
|
{ |
||||||
|
struct drm_output *output = to_drm_output(base); |
||||||
|
struct drm_backend *b = to_drm_backend(base->compositor); |
||||||
|
struct drm_head *head = to_drm_head(weston_output_get_first_head(base)); |
||||||
|
|
||||||
|
struct drm_mode *current; |
||||||
|
|
||||||
|
if (output->virtual) |
||||||
|
return -1; |
||||||
|
|
||||||
|
if (drm_output_update_modelist_from_heads(output) < 0) |
||||||
|
return -1; |
||||||
|
|
||||||
|
current = drm_output_choose_initial_mode(b, output, mode, modeline, |
||||||
|
&head->inherited_mode); |
||||||
|
if (!current) |
||||||
|
return -1; |
||||||
|
|
||||||
|
output->base.current_mode = ¤t->base; |
||||||
|
output->base.current_mode->flags |= WL_OUTPUT_MODE_CURRENT; |
||||||
|
|
||||||
|
/* Set native_ fields, so weston_output_mode_switch_to_native() works */ |
||||||
|
output->base.native_mode = output->base.current_mode; |
||||||
|
output->base.native_scale = output->base.current_scale; |
||||||
|
|
||||||
|
return 0; |
||||||
|
} |
||||||
Loading…
Reference in new issue