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path: root/drivers/gpu/drm
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-rw-r--r--drivers/gpu/drm/drm_fb_helper.c73
1 files changed, 40 insertions, 33 deletions
diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index 1f26634f53d8..380a0ec01033 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -97,6 +97,10 @@ static LIST_HEAD(kernel_fb_helper_list);
* mmap page writes.
*/
+#define drm_fb_helper_for_each_connector(fbh, i__) \
+ for (({ lockdep_assert_held(&(fbh)->dev->mode_config.mutex); }), \
+ i__ = 0; i__ < (fbh)->connector_count; i__++)
+
/**
* drm_fb_helper_single_add_all_connectors() - add all connectors to fbdev
* emulation helper
@@ -130,7 +134,7 @@ int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper)
mutex_unlock(&dev->mode_config.mutex);
return 0;
fail:
- for (i = 0; i < fb_helper->connector_count; i++) {
+ drm_fb_helper_for_each_connector(fb_helper, i) {
struct drm_fb_helper_connector *fb_helper_connector =
fb_helper->connector_info[i];
@@ -565,7 +569,7 @@ static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode)
continue;
/* Walk the connectors & encoders on this fb turning them on/off */
- for (j = 0; j < fb_helper->connector_count; j++) {
+ drm_fb_helper_for_each_connector(fb_helper, j) {
connector = fb_helper->connector_info[j]->connector;
connector->funcs->dpms(connector, dpms_mode);
drm_object_property_set_value(&connector->base,
@@ -1469,7 +1473,6 @@ static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
int ret = 0;
int crtc_count = 0;
int i;
- struct fb_info *info;
struct drm_fb_helper_surface_size sizes;
int gamma_size = 0;
@@ -1485,7 +1488,7 @@ static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
/* first up get a count of crtcs now in use and new min/maxes width/heights */
- for (i = 0; i < fb_helper->connector_count; i++) {
+ drm_fb_helper_for_each_connector(fb_helper, i) {
struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i];
struct drm_cmdline_mode *cmdline_mode;
@@ -1572,8 +1575,6 @@ static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
if (ret < 0)
return ret;
- info = fb_helper->fbdev;
-
/*
* Set the fb pointer - usually drm_setup_crtcs does this for hotplug
* events, but at init time drm_setup_crtcs needs to be called before
@@ -1585,20 +1586,6 @@ static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
if (fb_helper->crtc_info[i].mode_set.num_connectors)
fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb;
-
- info->var.pixclock = 0;
- if (register_framebuffer(info) < 0)
- return -EINVAL;
-
- dev_info(fb_helper->dev->dev, "fb%d: %s frame buffer device\n",
- info->node, info->fix.id);
-
- if (list_empty(&kernel_fb_helper_list)) {
- register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
- }
-
- list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
-
return 0;
}
@@ -1730,7 +1717,7 @@ static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper,
int count = 0;
int i;
- for (i = 0; i < fb_helper->connector_count; i++) {
+ drm_fb_helper_for_each_connector(fb_helper, i) {
connector = fb_helper->connector_info[i]->connector;
count += connector->funcs->fill_modes(connector, maxX, maxY);
}
@@ -1830,7 +1817,7 @@ static void drm_enable_connectors(struct drm_fb_helper *fb_helper,
struct drm_connector *connector;
int i = 0;
- for (i = 0; i < fb_helper->connector_count; i++) {
+ drm_fb_helper_for_each_connector(fb_helper, i) {
connector = fb_helper->connector_info[i]->connector;
enabled[i] = drm_connector_enabled(connector, true);
DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
@@ -1841,7 +1828,7 @@ static void drm_enable_connectors(struct drm_fb_helper *fb_helper,
if (any_enabled)
return;
- for (i = 0; i < fb_helper->connector_count; i++) {
+ drm_fb_helper_for_each_connector(fb_helper, i) {
connector = fb_helper->connector_info[i]->connector;
enabled[i] = drm_connector_enabled(connector, false);
}
@@ -1862,7 +1849,7 @@ static bool drm_target_cloned(struct drm_fb_helper *fb_helper,
return false;
count = 0;
- for (i = 0; i < fb_helper->connector_count; i++) {
+ drm_fb_helper_for_each_connector(fb_helper, i) {
if (enabled[i])
count++;
}
@@ -1873,7 +1860,7 @@ static bool drm_target_cloned(struct drm_fb_helper *fb_helper,
/* check the command line or if nothing common pick 1024x768 */
can_clone = true;
- for (i = 0; i < fb_helper->connector_count; i++) {
+ drm_fb_helper_for_each_connector(fb_helper, i) {
if (!enabled[i])
continue;
fb_helper_conn = fb_helper->connector_info[i];
@@ -1899,8 +1886,7 @@ static bool drm_target_cloned(struct drm_fb_helper *fb_helper,
can_clone = true;
dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60, false);
- for (i = 0; i < fb_helper->connector_count; i++) {
-
+ drm_fb_helper_for_each_connector(fb_helper, i) {
if (!enabled[i])
continue;
@@ -1931,7 +1917,7 @@ static int drm_get_tile_offsets(struct drm_fb_helper *fb_helper,
int i;
int hoffset = 0, voffset = 0;
- for (i = 0; i < fb_helper->connector_count; i++) {
+ drm_fb_helper_for_each_connector(fb_helper, i) {
fb_helper_conn = fb_helper->connector_info[i];
if (!fb_helper_conn->connector->has_tile)
continue;
@@ -1965,7 +1951,7 @@ static bool drm_target_preferred(struct drm_fb_helper *fb_helper,
int i;
retry:
- for (i = 0; i < fb_helper->connector_count; i++) {
+ drm_fb_helper_for_each_connector(fb_helper, i) {
fb_helper_conn = fb_helper->connector_info[i];
if (conn_configured & BIT_ULL(i))
@@ -2128,6 +2114,9 @@ static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
width = dev->mode_config.max_width;
height = dev->mode_config.max_height;
+ /* prevent concurrent modification of connector_count by hotplug */
+ lockdep_assert_held(&fb_helper->dev->mode_config.mutex);
+
crtcs = kcalloc(fb_helper->connector_count,
sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
modes = kcalloc(fb_helper->connector_count,
@@ -2141,7 +2130,6 @@ static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
goto out;
}
-
drm_enable_connectors(fb_helper, enabled);
if (!(fb_helper->funcs->initial_config &&
@@ -2170,7 +2158,7 @@ static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
drm_fb_helper_modeset_release(fb_helper,
&fb_helper->crtc_info[i].mode_set);
- for (i = 0; i < fb_helper->connector_count; i++) {
+ drm_fb_helper_for_each_connector(fb_helper, i) {
struct drm_display_mode *mode = modes[i];
struct drm_fb_helper_crtc *fb_crtc = crtcs[i];
struct drm_fb_offset *offset = &offsets[i];
@@ -2247,7 +2235,9 @@ out:
int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
{
struct drm_device *dev = fb_helper->dev;
+ struct fb_info *info;
int count = 0;
+ int ret;
if (!drm_fbdev_emulation)
return 0;
@@ -2256,7 +2246,6 @@ int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
count = drm_fb_helper_probe_connector_modes(fb_helper,
dev->mode_config.max_width,
dev->mode_config.max_height);
- mutex_unlock(&dev->mode_config.mutex);
/*
* we shouldn't end up with no modes here.
*/
@@ -2264,8 +2253,26 @@ int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
dev_info(fb_helper->dev->dev, "No connectors reported connected with modes\n");
drm_setup_crtcs(fb_helper);
+ ret = drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
+ mutex_unlock(&dev->mode_config.mutex);
+ if (ret)
+ return ret;
- return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
+ info = fb_helper->fbdev;
+ info->var.pixclock = 0;
+ ret = register_framebuffer(info);
+ if (ret < 0)
+ return ret;
+
+ dev_info(dev->dev, "fb%d: %s frame buffer device\n",
+ info->node, info->fix.id);
+
+ if (list_empty(&kernel_fb_helper_list))
+ register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
+
+ list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
+
+ return 0;
}
EXPORT_SYMBOL(drm_fb_helper_initial_config);
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-18 17:20:16 +0000