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drm/fh-helper: Split fbdev single-probe helper 

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@suse.de>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230102112927.26565-11-tzimmermann@suse.de
This commit is contained in:
Thomas Zimmermann 2023-01-02 12:29:24 +01:00 committed by Junxiao Chang
parent b7ff770542
commit 73399c92ea
1 changed files with 73 additions and 43 deletions
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116
drivers/gpu/drm/drm_fb_helper.c
View File

@ -1728,36 +1728,30 @@ 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) {
@ -1768,21 +1762,21 @@ 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;
@ -1795,7 +1789,6 @@ 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;
@ -1819,13 +1812,13 @@ 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 */
@ -1833,10 +1826,10 @@ 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 */
@ -1860,8 +1853,10 @@ 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];
@ -1877,28 +1872,63 @@ 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)