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weston/libweston/backend-drm/modes.c

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/*
* Copyright © 2008-2011 Kristian Høgsberg
* Copyright © 2011 Intel Corporation
* Copyright © 2017, 2018 Collabora, Ltd.
* Copyright © 2017, 2018 General Electric Company
* Copyright (c) 2018 DisplayLink (UK) Ltd.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial
* portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include "config.h"
#include <xf86drm.h>
#include <xf86drmMode.h>
#include "drm-internal.h"
#include "shared/weston-drm-fourcc.h"
static const char *const aspect_ratio_as_string[] = {
[WESTON_MODE_PIC_AR_NONE] = "",
[WESTON_MODE_PIC_AR_4_3] = " 4:3",
[WESTON_MODE_PIC_AR_16_9] = " 16:9",
[WESTON_MODE_PIC_AR_64_27] = " 64:27",
[WESTON_MODE_PIC_AR_256_135] = " 256:135",
};
/*
* Get the aspect-ratio from drmModeModeInfo mode flags.
*
* @param drm_mode_flags- flags from drmModeModeInfo structure.
* @returns aspect-ratio as encoded in enum 'weston_mode_aspect_ratio'.
*/
static enum weston_mode_aspect_ratio
drm_to_weston_mode_aspect_ratio(uint32_t drm_mode_flags)
{
switch (drm_mode_flags & DRM_MODE_FLAG_PIC_AR_MASK) {
case DRM_MODE_FLAG_PIC_AR_4_3:
return WESTON_MODE_PIC_AR_4_3;
case DRM_MODE_FLAG_PIC_AR_16_9:
return WESTON_MODE_PIC_AR_16_9;
case DRM_MODE_FLAG_PIC_AR_64_27:
return WESTON_MODE_PIC_AR_64_27;
case DRM_MODE_FLAG_PIC_AR_256_135:
return WESTON_MODE_PIC_AR_256_135;
case DRM_MODE_FLAG_PIC_AR_NONE:
default:
return WESTON_MODE_PIC_AR_NONE;
}
}
static const char *
aspect_ratio_to_string(enum weston_mode_aspect_ratio ratio)
{
if (ratio < 0 || ratio >= ARRAY_LENGTH(aspect_ratio_as_string) ||
!aspect_ratio_as_string[ratio])
return " (unknown aspect ratio)";
return aspect_ratio_as_string[ratio];
}
static int
drm_subpixel_to_wayland(int drm_value)
{
switch (drm_value) {
default:
case DRM_MODE_SUBPIXEL_UNKNOWN:
return WL_OUTPUT_SUBPIXEL_UNKNOWN;
case DRM_MODE_SUBPIXEL_NONE:
return WL_OUTPUT_SUBPIXEL_NONE;
case DRM_MODE_SUBPIXEL_HORIZONTAL_RGB:
return WL_OUTPUT_SUBPIXEL_HORIZONTAL_RGB;
case DRM_MODE_SUBPIXEL_HORIZONTAL_BGR:
return WL_OUTPUT_SUBPIXEL_HORIZONTAL_BGR;
case DRM_MODE_SUBPIXEL_VERTICAL_RGB:
return WL_OUTPUT_SUBPIXEL_VERTICAL_RGB;
case DRM_MODE_SUBPIXEL_VERTICAL_BGR:
return WL_OUTPUT_SUBPIXEL_VERTICAL_BGR;
}
}
int
drm_mode_ensure_blob(struct drm_device *device, struct drm_mode *mode)
{
struct drm_backend *backend = device->backend;
int ret;
if (mode->blob_id)
return 0;
ret = drmModeCreatePropertyBlob(device->drm.fd,
&mode->mode_info,
sizeof(mode->mode_info),
&mode->blob_id);
if (ret != 0)
weston_log("failed to create mode property blob: %s\n",
strerror(errno));
drm_debug(backend, "\t\t\t[atomic] created new mode blob %lu for %s\n",
(unsigned long) mode->blob_id, mode->mode_info.name);
return ret;
}
static bool
check_non_desktop(struct drm_connector *connector, drmModeObjectPropertiesPtr props)
{
struct drm_property_info *non_desktop_info =
&connector->props[WDRM_CONNECTOR_NON_DESKTOP];
return drm_property_get_value(non_desktop_info, props, 0);
}
static uint32_t
get_panel_orientation(struct drm_connector *connector, drmModeObjectPropertiesPtr props)
{
struct drm_property_info *orientation =
&connector->props[WDRM_CONNECTOR_PANEL_ORIENTATION];
uint64_t kms_val =
drm_property_get_value(orientation, props,
WDRM_PANEL_ORIENTATION_NORMAL);
switch (kms_val) {
case WDRM_PANEL_ORIENTATION_NORMAL:
return WL_OUTPUT_TRANSFORM_NORMAL;
case WDRM_PANEL_ORIENTATION_UPSIDE_DOWN:
return WL_OUTPUT_TRANSFORM_180;
case WDRM_PANEL_ORIENTATION_LEFT_SIDE_UP:
return WL_OUTPUT_TRANSFORM_90;
case WDRM_PANEL_ORIENTATION_RIGHT_SIDE_UP:
return WL_OUTPUT_TRANSFORM_270;
default:
assert(!"unknown property value in get_panel_orientation");
}
}
static int
parse_modeline(const char *s, drmModeModeInfo *mode)
{
char hsync[16];
char vsync[16];
float fclock;
memset(mode, 0, sizeof *mode);
mode->type = DRM_MODE_TYPE_USERDEF;
mode->hskew = 0;
mode->vscan = 0;
mode->vrefresh = 0;
mode->flags = 0;
if (sscanf(s, "%f %hd %hd %hd %hd %hd %hd %hd %hd %15s %15s",
&fclock,
&mode->hdisplay,
&mode->hsync_start,
&mode->hsync_end,
&mode->htotal,
&mode->vdisplay,
&mode->vsync_start,
&mode->vsync_end,
&mode->vtotal, hsync, vsync) != 11)
return -1;
mode->clock = fclock * 1000;
if (strcasecmp(hsync, "+hsync") == 0)
mode->flags |= DRM_MODE_FLAG_PHSYNC;
else if (strcasecmp(hsync, "-hsync") == 0)
mode->flags |= DRM_MODE_FLAG_NHSYNC;
else
return -1;
if (strcasecmp(vsync, "+vsync") == 0)
mode->flags |= DRM_MODE_FLAG_PVSYNC;
else if (strcasecmp(vsync, "-vsync") == 0)
mode->flags |= DRM_MODE_FLAG_NVSYNC;
else
return -1;
snprintf(mode->name, sizeof mode->name, "%dx%d@%.3f",
mode->hdisplay, mode->vdisplay, fclock);
return 0;
}
static void
edid_parse_string(const uint8_t *data, char text[])
{
int i;
int replaced = 0;
/* this is always 12 bytes, but we can't guarantee it's null
* terminated or not junk. */
strncpy(text, (const char *) data, 12);
/* guarantee our new string is null-terminated */
text[12] = '\0';
/* remove insane chars */
for (i = 0; text[i] != '\0'; i++) {
if (text[i] == '\n' ||
text[i] == '\r') {
text[i] = '\0';
break;
}
}
/* ensure string is printable */
for (i = 0; text[i] != '\0'; i++) {
if (!isprint(text[i])) {
text[i] = '-';
replaced++;
}
}
/* if the string is random junk, ignore the string */
if (replaced > 4)
text[0] = '\0';
}
#define EDID_DESCRIPTOR_ALPHANUMERIC_DATA_STRING 0xfe
#define EDID_DESCRIPTOR_DISPLAY_PRODUCT_NAME 0xfc
#define EDID_DESCRIPTOR_DISPLAY_PRODUCT_SERIAL_NUMBER 0xff
#define EDID_OFFSET_DATA_BLOCKS 0x36
#define EDID_OFFSET_LAST_BLOCK 0x6c
#define EDID_OFFSET_PNPID 0x08
#define EDID_OFFSET_SERIAL 0x0c
static int
edid_parse(struct drm_edid *edid, const uint8_t *data, size_t length)
{
int i;
uint32_t serial_number;
/* check header */
if (length < 128)
return -1;
if (data[0] != 0x00 || data[1] != 0xff)
return -1;
/* decode the PNP ID from three 5 bit words packed into 2 bytes
* /--08--\/--09--\
* 7654321076543210
* |\---/\---/\---/
* R C1 C2 C3 */
edid->pnp_id[0] = 'A' + ((data[EDID_OFFSET_PNPID + 0] & 0x7c) / 4) - 1;
edid->pnp_id[1] = 'A' + ((data[EDID_OFFSET_PNPID + 0] & 0x3) * 8) + ((data[EDID_OFFSET_PNPID + 1] & 0xe0) / 32) - 1;
edid->pnp_id[2] = 'A' + (data[EDID_OFFSET_PNPID + 1] & 0x1f) - 1;
edid->pnp_id[3] = '\0';
/* maybe there isn't a ASCII serial number descriptor, so use this instead */
serial_number = (uint32_t) data[EDID_OFFSET_SERIAL + 0];
serial_number += (uint32_t) data[EDID_OFFSET_SERIAL + 1] * 0x100;
serial_number += (uint32_t) data[EDID_OFFSET_SERIAL + 2] * 0x10000;
serial_number += (uint32_t) data[EDID_OFFSET_SERIAL + 3] * 0x1000000;
if (serial_number > 0)
sprintf(edid->serial_number, "%lu", (unsigned long) serial_number);
/* parse EDID data */
for (i = EDID_OFFSET_DATA_BLOCKS;
i <= EDID_OFFSET_LAST_BLOCK;
i += 18) {
/* ignore pixel clock data */
if (data[i] != 0)
continue;
if (data[i+2] != 0)
continue;
/* any useful blocks? */
if (data[i+3] == EDID_DESCRIPTOR_DISPLAY_PRODUCT_NAME) {
edid_parse_string(&data[i+5],
edid->monitor_name);
} else if (data[i+3] == EDID_DESCRIPTOR_DISPLAY_PRODUCT_SERIAL_NUMBER) {
edid_parse_string(&data[i+5],
edid->serial_number);
} else if (data[i+3] == EDID_DESCRIPTOR_ALPHANUMERIC_DATA_STRING) {
edid_parse_string(&data[i+5],
edid->eisa_id);
}
}
return 0;
}
/** Parse monitor make, model and serial from EDID
*
* \param head The head whose \c drm_edid to fill in.
* \param props The DRM connector properties to get the EDID from.
* \param[out] make The monitor make (PNP ID).
* \param[out] model The monitor model (name).
* \param[out] serial_number The monitor serial number.
* \param[out] eotf_mask The monitor supported EOTF modes, combination of
* enum weston_eotf_mode bits.
*
* Each of \c *make, \c *model and \c *serial_number are set only if the
* information is found in the EDID. The pointers they are set to must not
* be free()'d explicitly, instead they get implicitly freed when the
* \c drm_head is destroyed.
*/
static void
find_and_parse_output_edid(struct drm_head *head,
drmModeObjectPropertiesPtr props,
const char **make,
const char **model,
const char **serial_number,
uint32_t *eotf_mask)
{
struct drm_device *device = head->connector.device;
drmModePropertyBlobPtr edid_blob = NULL;
uint32_t blob_id;
int rc;
blob_id =
drm_property_get_value(
&head->connector.props[WDRM_CONNECTOR_EDID],
props, 0);
if (!blob_id)
return;
edid_blob = drmModeGetPropertyBlob(device->drm.fd, blob_id);
if (!edid_blob)
return;
rc = edid_parse(&head->edid,
edid_blob->data,
edid_blob->length);
if (!rc) {
if (head->edid.pnp_id[0] != '\0')
*make = head->edid.pnp_id;
if (head->edid.monitor_name[0] != '\0')
*model = head->edid.monitor_name;
if (head->edid.serial_number[0] != '\0')
*serial_number = head->edid.serial_number;
}
drmModeFreePropertyBlob(edid_blob);
/* TODO: parse this from EDID */
*eotf_mask = WESTON_EOTF_MODE_ALL_MASK;
}
static void
prune_eotf_modes_by_kms_support(struct drm_head *head, uint32_t *eotf_mask)
{
const struct drm_property_info *info;
/* Without the KMS property, cannot do anything but SDR. */
info = &head->connector.props[WDRM_CONNECTOR_HDR_OUTPUT_METADATA];
if (!head->connector.device->atomic_modeset || info->prop_id == 0)
*eotf_mask = WESTON_EOTF_MODE_SDR;
}
static uint32_t
drm_refresh_rate_mHz(const drmModeModeInfo *info)
{
uint64_t refresh;
/* Calculate higher precision (mHz) refresh rate */
refresh = (info->clock * 1000000LL / info->htotal +
info->vtotal / 2) / info->vtotal;
if (info->flags & DRM_MODE_FLAG_INTERLACE)
refresh *= 2;
if (info->flags & DRM_MODE_FLAG_DBLSCAN)
refresh /= 2;
if (info->vscan > 1)
refresh /= info->vscan;
return refresh;
}
/**
* Add a mode to output's mode list
*
* Copy the supplied DRM mode into a Weston mode structure, and add it to the
* output's mode list.
*
* @param output DRM output to add mode to
* @param info DRM mode structure to add
* @returns Newly-allocated Weston/DRM mode structure
*/
static struct drm_mode *
drm_output_add_mode(struct drm_output *output, const drmModeModeInfo *info)
{
struct drm_mode *mode;
mode = malloc(sizeof *mode);
if (mode == NULL)
return NULL;
mode->base.flags = 0;
mode->base.width = info->hdisplay;
mode->base.height = info->vdisplay;
mode->base.refresh = drm_refresh_rate_mHz(info);
mode->mode_info = *info;
mode->blob_id = 0;
if (info->type & DRM_MODE_TYPE_PREFERRED)
mode->base.flags |= WL_OUTPUT_MODE_PREFERRED;
mode->base.aspect_ratio = drm_to_weston_mode_aspect_ratio(info->flags);
wl_list_insert(output->base.mode_list.prev, &mode->base.link);
return mode;
}
/**
* Destroys a mode, and removes it from the list.
*/
static void
drm_output_destroy_mode(struct drm_device *device, struct drm_mode *mode)
{
if (mode->blob_id)
drmModeDestroyPropertyBlob(device->drm.fd, mode->blob_id);
wl_list_remove(&mode->base.link);
free(mode);
}
/** Destroy a list of drm_modes
*
* @param device The device for releasing mode property blobs.
* @param mode_list The list linked by drm_mode::base.link.
*/
void
drm_mode_list_destroy(struct drm_device *device, struct wl_list *mode_list)
{
struct drm_mode *mode, *next;
wl_list_for_each_safe(mode, next, mode_list, base.link)
drm_output_destroy_mode(device, mode);
}
void
drm_output_print_modes(struct drm_output *output)
{
struct weston_mode *m;
struct drm_mode *dm;
const char *aspect_ratio;
wl_list_for_each(m, &output->base.mode_list, link) {
dm = to_drm_mode(m);
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;
struct drm_device *device;
b = to_drm_backend(output->base.compositor);
device = b->drm;
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 (!device->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 (!device->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)
{
struct drm_connector *connector = &head->connector;
drmModeObjectProperties *props = connector->props_drm;
drmModeConnector *conn = connector->conn;
const char *make = "unknown";
const char *model = "unknown";
const char *serial_number = "unknown";
uint32_t eotf_mask = WESTON_EOTF_MODE_SDR;
find_and_parse_output_edid(head, props, &make, &model, &serial_number, &eotf_mask);
weston_head_set_monitor_strings(&head->base, make, model, serial_number);
prune_eotf_modes_by_kms_support(head, &eotf_mask);
weston_head_set_supported_eotf_mask(&head->base, eotf_mask);
weston_head_set_non_desktop(&head->base,
check_non_desktop(connector, props));
weston_head_set_subpixel(&head->base,
drm_subpixel_to_wayland(conn->subpixel));
weston_head_set_physical_size(&head->base, conn->mmWidth, conn->mmHeight);
weston_head_set_transform(&head->base,
get_panel_orientation(connector, props));
/* Unknown connection status is assumed disconnected. */
weston_head_set_connection_status(&head->base,
conn->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 device the DRM device
* @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_device *device,
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 (device->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 (!device->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 = NULL;
struct drm_backend *backend;
struct drm_device *device;
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) {
assert(mode);
backend = to_drm_backend(output->base.compositor);
device = backend->drm;
drm_output_destroy_mode(device, 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 drm_device *device = backend->drm;
struct weston_head *head_base;
struct drm_head *head;
drmModeConnector *conn;
int i;
int ret;
assert(!output->base.enabled);
drm_mode_list_destroy(device, &output->base.mode_list);
wl_list_for_each(head_base, &output->base.head_list, output_link) {
head = to_drm_head(head_base);
conn = head->connector.conn;
for (i = 0; i < conn->count_modes; i++) {
ret = drm_output_try_add_mode(output, &conn->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_device *device = b->drm;
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(device, output, mode, modeline,
&head->inherited_mode);
if (!current)
return -1;
output->base.current_mode = &current->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;
}