/*
* Try to read the BIOS display configuration and use it for the initial
* fb configuration.
*
* The BIOS or boot loader will generally create an initial display
* configuration for us that includes some set of active pipes and displays.
* This routine tries to figure out which pipes and connectors are active
* and stuffs them into the crtcs and modes array given to us by the
* drm_fb_helper code.
*
* The overall sequence is:
* intel_fbdev_init - from driver load
* intel_fbdev_init_bios - initialize the intel_fbdev using BIOS data
* drm_fb_helper_init - build fb helper structs
* drm_fb_helper_single_add_all_connectors - more fb helper structs
* intel_fbdev_initial_config - apply the config
* drm_fb_helper_initial_config - call ->probe then register_framebuffer()
* drm_setup_crtcs - build crtc config for fbdev
* intel_fb_initial_config - find active connectors etc
* drm_fb_helper_single_fb_probe - set up fbdev
* intelfb_create - re-use or alloc fb, build out fbdev structs
*
* Note that we don't make special consideration whether we could actually
* switch to the selected modes without a full modeset. E.g. when the display
* is in VGA mode we need to recalculate watermarks and set a new high-res
* framebuffer anyway.
*/
static bool intel_fb_initial_config(struct drm_fb_helper *fb_helper,
struct drm_fb_helper_crtc **crtcs,
struct drm_display_mode **modes,
bool *enabled, int width, int height)
{
struct drm_device *dev = fb_helper->dev;
int i, j;
bool *save_enabled;
bool fallback = true;
int num_connectors_enabled = 0;
int num_connectors_detected = 0;
/*
* If the user specified any force options, just bail here
* and use that config.
*/
for (i = 0; i < fb_helper->connector_count; i++) {
struct drm_fb_helper_connector *fb_conn;
struct drm_connector *connector;
fb_conn = fb_helper->connector_info[i];
connector = fb_conn->connector;
if (!enabled[i])
continue;
if (connector->force != DRM_FORCE_UNSPECIFIED)
return false;
}
save_enabled = kcalloc(dev->mode_config.num_connector, sizeof(bool),
GFP_KERNEL);
if (!save_enabled)
return false;
memcpy(save_enabled, enabled, dev->mode_config.num_connector);
for (i = 0; i < fb_helper->connector_count; i++) {
struct drm_fb_helper_connector *fb_conn;
struct drm_connector *connector;
struct drm_encoder *encoder;
struct drm_fb_helper_crtc *new_crtc;
fb_conn = fb_helper->connector_info[i];
connector = fb_conn->connector;
if (connector->status == connector_status_connected)
num_connectors_detected++;
if (!enabled[i]) {
DRM_DEBUG_KMS("connector %d not enabled, skipping\n",
connector->base.id);
continue;
}
encoder = connector->encoder;
if (!encoder || WARN_ON(!encoder->crtc)) {
DRM_DEBUG_KMS("connector %d has no encoder or crtc, skipping\n",
connector->base.id);
enabled[i] = false;
continue;
}
num_connectors_enabled++;
new_crtc = intel_fb_helper_crtc(fb_helper, encoder->crtc);
/*
* Make sure we're not trying to drive multiple connectors
* with a single CRTC, since our cloning support may not
* match the BIOS.
*/
for (j = 0; j < fb_helper->connector_count; j++) {
if (crtcs[j] == new_crtc) {
DRM_DEBUG_KMS("fallback: cloned configuration\n");
fallback = true;
goto out;
}
}
DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
fb_conn->connector->base.id);
/* go for command line mode first */
modes[i] = drm_pick_cmdline_mode(fb_conn, width, height);
/* try for preferred next */
if (!modes[i]) {
DRM_DEBUG_KMS("looking for preferred mode on connector %d\n",
fb_conn->connector->base.id);
modes[i] = drm_has_preferred_mode(fb_conn, width,
height);
}
/* last resort: use current mode */
if (!modes[i]) {
/*
* IMPORTANT: We want to use the adjusted mode (i.e.
* after the panel fitter upscaling) as the initial
* config, not the input mode, which is what crtc->mode
* usually contains. But since our current fastboot
* code puts a mode derived from the post-pfit timings
* into crtc->mode this works out correctly. We don't
* use hwmode anywhere right now, so use it for this
* since the fb helper layer wants a pointer to
* something we own.
*/
intel_mode_from_pipe_config(&encoder->crtc->hwmode,
&to_intel_crtc(encoder->crtc)->config);
modes[i] = &encoder->crtc->hwmode;
}
crtcs[i] = new_crtc;
DRM_DEBUG_KMS("connector %s on crtc %d: %s\n",
drm_get_connector_name(connector),
encoder->crtc->base.id,
modes[i]->name);
fallback = false;
}
/*
* If the BIOS didn't enable everything it could, fall back to have the
* same user experiencing of lighting up as much as possible like the
* fbdev helper library.
*/
if (num_connectors_enabled != num_connectors_detected &&
num_connectors_enabled < INTEL_INFO(dev)->num_pipes) {
DRM_DEBUG_KMS("fallback: Not all outputs enabled\n");
DRM_DEBUG_KMS("Enabled: %i, detected: %i\n", num_connectors_enabled,
num_connectors_detected);
fallback = true;
}
out:
if (fallback) {
DRM_DEBUG_KMS("Not using firmware configuration\n");
memcpy(enabled, save_enabled, dev->mode_config.num_connector);
kfree(save_enabled);
return false;
}
kfree(save_enabled);
return true;
}
/*
* Try to read the BIOS display configuration and use it for the initial
* fb configuration.
*
* The BIOS or boot loader will generally create an initial display
* configuration for us that includes some set of active pipes and displays.
* This routine tries to figure out which pipes and connectors are active
* and stuffs them into the crtcs and modes array given to us by the
* drm_fb_helper code.
*
* The overall sequence is:
* intel_fbdev_init - from driver load
* intel_fbdev_init_bios - initialize the intel_fbdev using BIOS data
* drm_fb_helper_init - build fb helper structs
* drm_fb_helper_single_add_all_connectors - more fb helper structs
* intel_fbdev_initial_config - apply the config
* drm_fb_helper_initial_config - call ->probe then register_framebuffer()
* drm_setup_crtcs - build crtc config for fbdev
* intel_fb_initial_config - find active connectors etc
* drm_fb_helper_single_fb_probe - set up fbdev
* intelfb_create - re-use or alloc fb, build out fbdev structs
*
* Note that we don't make special consideration whether we could actually
* switch to the selected modes without a full modeset. E.g. when the display
* is in VGA mode we need to recalculate watermarks and set a new high-res
* framebuffer anyway.
*/
static bool intel_fb_initial_config(struct drm_fb_helper *fb_helper,
struct drm_fb_helper_crtc **crtcs,
struct drm_display_mode **modes,
bool *enabled, int width, int height)
{
struct drm_device *dev = fb_helper->dev;
int i, j;
bool *save_enabled;
bool fallback = true;
int num_connectors_enabled = 0;
int num_connectors_detected = 0;
/*
* If the user specified any force options, just bail here
* and use that config.
*/
for (i = 0; i < fb_helper->connector_count; i++) {
struct drm_fb_helper_connector *fb_conn;
struct drm_connector *connector;
fb_conn = fb_helper->connector_info[i];
connector = fb_conn->connector;
if (!enabled[i])
continue;
if (connector->force != DRM_FORCE_UNSPECIFIED)
return false;
}
save_enabled = kcalloc(dev->mode_config.num_connector, sizeof(bool),
GFP_KERNEL);
if (!save_enabled)
return false;
memcpy(save_enabled, enabled, dev->mode_config.num_connector);
for (i = 0; i < fb_helper->connector_count; i++) {
struct drm_fb_helper_connector *fb_conn;
struct drm_connector *connector;
struct drm_encoder *encoder;
struct drm_fb_helper_crtc *new_crtc;
fb_conn = fb_helper->connector_info[i];
connector = fb_conn->connector;
if (connector->status == connector_status_connected)
num_connectors_detected++;
if (!enabled[i]) {
DRM_DEBUG_KMS("connector %s not enabled, skipping\n",
connector->name);
continue;
}
encoder = connector->encoder;
if (!encoder || WARN_ON(!encoder->crtc)) {
DRM_DEBUG_KMS("connector %s has no encoder or crtc, skipping\n",
connector->name);
enabled[i] = false;
continue;
}
num_connectors_enabled++;
new_crtc = intel_fb_helper_crtc(fb_helper, encoder->crtc);
/*
* Make sure we're not trying to drive multiple connectors
* with a single CRTC, since our cloning support may not
* match the BIOS.
*/
for (j = 0; j < fb_helper->connector_count; j++) {
if (crtcs[j] == new_crtc) {
DRM_DEBUG_KMS("fallback: cloned configuration\n");
fallback = true;
goto out;
}
}
DRM_DEBUG_KMS("looking for cmdline mode on connector %s\n",
connector->name);
/* go for command line mode first */
modes[i] = drm_pick_cmdline_mode(fb_conn, width, height);
/* try for preferred next */
if (!modes[i]) {
DRM_DEBUG_KMS("looking for preferred mode on connector %s\n",
connector->name);
modes[i] = drm_has_preferred_mode(fb_conn, width,
height);
}
/* No preferred mode marked by the EDID? Are there any modes? */
if (!modes[i] && !list_empty(&connector->modes)) {
DRM_DEBUG_KMS("using first mode listed on connector %s\n",
connector->name);
modes[i] = list_first_entry(&connector->modes,
struct drm_display_mode,
head);
}
/* last resort: use current mode */
if (!modes[i]) {
/*
* IMPORTANT: We want to use the adjusted mode (i.e.
* after the panel fitter upscaling) as the initial
* config, not the input mode, which is what crtc->mode
* usually contains. But since our current fastboot
* code puts a mode derived from the post-pfit timings
* into crtc->mode this works out correctly. We don't
* use hwmode anywhere right now, so use it for this
* since the fb helper layer wants a pointer to
* something we own.
*/
DRM_DEBUG_KMS("looking for current mode on connector %s\n",
connector->name);
intel_mode_from_pipe_config(&encoder->crtc->hwmode,
&to_intel_crtc(encoder->crtc)->config);
modes[i] = &encoder->crtc->hwmode;
}
crtcs[i] = new_crtc;
DRM_DEBUG_KMS("connector %s on pipe %c [CRTC:%d]: %dx%d%s\n",
connector->name,
pipe_name(to_intel_crtc(encoder->crtc)->pipe),
encoder->crtc->base.id,
modes[i]->hdisplay, modes[i]->vdisplay,
modes[i]->flags & DRM_MODE_FLAG_INTERLACE ? "i" :"");
fallback = false;
}