[PATCH 6/9] drm/fh-helper: Split fbdev single-probe helper
Thomas Zimmermann
tzimmermann at suse.de
Tue Dec 13 20:12:30 UTC 2022
Split the single-probe helper's implementation into multiple
functions and get locking and overallocation out of the way of
the surface setup. Simplifies later changes to the setup code.
Signed-off-by: Thomas Zimmermann <tzimmermann at suse.de>
---
drivers/gpu/drm/drm_fb_helper.c | 116 ++++++++++++++++++++------------
1 file changed, 73 insertions(+), 43 deletions(-)
diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index b3a731b9170a..af1495394d38 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -1726,36 +1726,30 @@ int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
}
EXPORT_SYMBOL(drm_fb_helper_pan_display);
-/*
- * Allocates the backing storage and sets up the fbdev info structure through
- * the ->fb_probe callback.
- */
-static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
- int preferred_bpp)
+
+static int __drm_fb_helper_find_sizes(struct drm_fb_helper *fb_helper, int preferred_bpp,
+ struct drm_fb_helper_surface_size *sizes)
{
struct drm_client_dev *client = &fb_helper->client;
struct drm_device *dev = fb_helper->dev;
- struct drm_mode_config *config = &dev->mode_config;
- int ret = 0;
int crtc_count = 0;
struct drm_connector_list_iter conn_iter;
- struct drm_fb_helper_surface_size sizes;
struct drm_connector *connector;
struct drm_mode_set *mode_set;
int best_depth = 0;
- memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));
- sizes.surface_depth = 24;
- sizes.surface_bpp = 32;
- sizes.fb_width = (u32)-1;
- sizes.fb_height = (u32)-1;
+ memset(sizes, 0, sizeof(struct drm_fb_helper_surface_size));
+ sizes->surface_depth = 24;
+ sizes->surface_bpp = 32;
+ sizes->fb_width = (u32)-1;
+ sizes->fb_height = (u32)-1;
/*
* If driver picks 8 or 16 by default use that for both depth/bpp
* to begin with
*/
- if (preferred_bpp != sizes.surface_bpp)
- sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
+ if (preferred_bpp != sizes->surface_bpp)
+ sizes->surface_depth = sizes->surface_bpp = preferred_bpp;
drm_connector_list_iter_begin(fb_helper->dev, &conn_iter);
drm_client_for_each_connector_iter(connector, &conn_iter) {
@@ -1766,21 +1760,21 @@ static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
if (cmdline_mode->bpp_specified) {
switch (cmdline_mode->bpp) {
case 8:
- sizes.surface_depth = sizes.surface_bpp = 8;
+ sizes->surface_depth = sizes->surface_bpp = 8;
break;
case 15:
- sizes.surface_depth = 15;
- sizes.surface_bpp = 16;
+ sizes->surface_depth = 15;
+ sizes->surface_bpp = 16;
break;
case 16:
- sizes.surface_depth = sizes.surface_bpp = 16;
+ sizes->surface_depth = sizes->surface_bpp = 16;
break;
case 24:
- sizes.surface_depth = sizes.surface_bpp = 24;
+ sizes->surface_depth = sizes->surface_bpp = 24;
break;
case 32:
- sizes.surface_depth = 24;
- sizes.surface_bpp = 32;
+ sizes->surface_depth = 24;
+ sizes->surface_bpp = 32;
break;
}
break;
@@ -1793,7 +1787,6 @@ static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
* supports RGBA5551 (16 bpp, depth 15) but not RGB565 (16 bpp, depth
* 16) we need to scale down the depth of the sizes we request.
*/
- mutex_lock(&client->modeset_mutex);
drm_client_for_each_modeset(mode_set, client) {
struct drm_crtc *crtc = mode_set->crtc;
struct drm_plane *plane = crtc->primary;
@@ -1817,13 +1810,13 @@ static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
continue;
/* We found a perfect fit, great */
- if (fmt->depth == sizes.surface_depth) {
+ if (fmt->depth == sizes->surface_depth) {
best_depth = fmt->depth;
break;
}
/* Skip depths above what we're looking for */
- if (fmt->depth > sizes.surface_depth)
+ if (fmt->depth > sizes->surface_depth)
continue;
/* Best depth found so far */
@@ -1831,10 +1824,10 @@ static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
best_depth = fmt->depth;
}
}
- if (sizes.surface_depth != best_depth && best_depth) {
+ if (sizes->surface_depth != best_depth && best_depth) {
drm_info(dev, "requested bpp %d, scaled depth down to %d",
- sizes.surface_bpp, best_depth);
- sizes.surface_depth = best_depth;
+ sizes->surface_bpp, best_depth);
+ sizes->surface_depth = best_depth;
}
/* first up get a count of crtcs now in use and new min/maxes width/heights */
@@ -1858,8 +1851,10 @@ static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
x = mode_set->x;
y = mode_set->y;
- sizes.surface_width = max_t(u32, desired_mode->hdisplay + x, sizes.surface_width);
- sizes.surface_height = max_t(u32, desired_mode->vdisplay + y, sizes.surface_height);
+ sizes->surface_width =
+ max_t(u32, desired_mode->hdisplay + x, sizes->surface_width);
+ sizes->surface_height =
+ max_t(u32, desired_mode->vdisplay + y, sizes->surface_height);
for (j = 0; j < mode_set->num_connectors; j++) {
struct drm_connector *connector = mode_set->connectors[j];
@@ -1875,28 +1870,63 @@ static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
}
if (lasth)
- sizes.fb_width = min_t(u32, desired_mode->hdisplay + x, sizes.fb_width);
+ sizes->fb_width = min_t(u32, desired_mode->hdisplay + x, sizes->fb_width);
if (lastv)
- sizes.fb_height = min_t(u32, desired_mode->vdisplay + y, sizes.fb_height);
+ sizes->fb_height = min_t(u32, desired_mode->vdisplay + y, sizes->fb_height);
}
- mutex_unlock(&client->modeset_mutex);
- if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
+ if (crtc_count == 0 || sizes->fb_width == -1 || sizes->fb_height == -1) {
drm_info(dev, "Cannot find any crtc or sizes\n");
-
- /* First time: disable all crtc's.. */
- if (!fb_helper->deferred_setup)
- drm_client_modeset_commit(client);
return -EAGAIN;
}
+ return 0;
+}
+
+static int drm_fb_helper_find_sizes(struct drm_fb_helper *fb_helper, int preferred_bpp,
+ struct drm_fb_helper_surface_size *sizes)
+{
+ struct drm_client_dev *client = &fb_helper->client;
+ struct drm_device *dev = fb_helper->dev;
+ struct drm_mode_config *config = &dev->mode_config;
+ int ret;
+
+ mutex_lock(&client->modeset_mutex);
+ ret = __drm_fb_helper_find_sizes(fb_helper, preferred_bpp, sizes);
+ mutex_unlock(&client->modeset_mutex);
+
+ if (ret)
+ return ret;
+
/* Handle our overallocation */
- sizes.surface_height *= drm_fbdev_overalloc;
- sizes.surface_height /= 100;
- if (sizes.surface_height > config->max_height) {
+ sizes->surface_height *= drm_fbdev_overalloc;
+ sizes->surface_height /= 100;
+ if (sizes->surface_height > config->max_height) {
drm_dbg_kms(dev, "Fbdev over-allocation too large; clamping height to %d\n",
config->max_height);
- sizes.surface_height = config->max_height;
+ sizes->surface_height = config->max_height;
+ }
+
+ return 0;
+}
+
+/*
+ * Allocates the backing storage and sets up the fbdev info structure through
+ * the ->fb_probe callback.
+ */
+static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
+ int preferred_bpp)
+{
+ struct drm_client_dev *client = &fb_helper->client;
+ struct drm_fb_helper_surface_size sizes;
+ int ret;
+
+ ret = drm_fb_helper_find_sizes(fb_helper, preferred_bpp, &sizes);
+ if (ret) {
+ /* First time: disable all crtc's.. */
+ if (!fb_helper->deferred_setup)
+ drm_client_modeset_commit(client);
+ return ret;
}
#if IS_ENABLED(CONFIG_DRM_FBDEV_LEAK_PHYS_SMEM)
--
2.38.1
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