Like with panning and modesetting, and like with those, stick with
simple drm_modeset_locking_all for the legacy path, and the full
atomic dance for atomic drivers.
This means a bit more boilerplate since setting up the atomic state
machinery is rather verbose, but then this is shared code for 30+
drivers or so, so meh.
After this patch there's only the LUT/cmap path which is still using
drm_modeset_lock_all for an atomic driver. But Peter is already
locking into reworking that, so I'll leave that code as-is for now.
Cc: Peter Rosin <p...@axentia.se>
Cc: John Stultz <john.stu...@linaro.org>
Cc: Thierry Reding <tred...@nvidia.com>
Signed-off-by: Daniel Vetter <daniel.vet...@intel.com>
---
drivers/gpu/drm/drm_fb_helper.c | 88 +++++++++++++++++++++++++++++++++++------
1 file changed, 76 insertions(+), 12 deletions(-)
diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index 59e2916471b2..bbd4c6d0378d 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -616,23 +616,13 @@ static struct sysrq_key_op sysrq_drm_fb_helper_restore_op
= {
static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { };
#endif
-static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode)
+static void dpms_legacy(struct drm_fb_helper *fb_helper, int dpms_mode)
{
- struct drm_fb_helper *fb_helper = info->par;
struct drm_device *dev = fb_helper->dev;
struct drm_crtc *crtc;
struct drm_connector *connector;
int i, j;
- /*
- * For each CRTC in this fb, turn the connectors on/off.
- */
- mutex_lock(&fb_helper->lock);
- if (!drm_fb_helper_is_bound(fb_helper)) {
- mutex_unlock(&fb_helper->lock);
- return;
- }
-
drm_modeset_lock_all(dev);
for (i = 0; i < fb_helper->crtc_count; i++) {
crtc = fb_helper->crtc_info[i].mode_set.crtc;
@@ -649,6 +639,81 @@ static void drm_fb_helper_dpms(struct fb_info *info, int
dpms_mode)
}
}
drm_modeset_unlock_all(dev);
+}
+
+static void dpms_atomic(struct drm_fb_helper *fb_helper, int dpms_mode)
+{
+ struct drm_device *dev = fb_helper->dev;
+ struct drm_atomic_state *state;
+ int i, ret;
+
+ struct drm_modeset_acquire_ctx ctx;
+
+ drm_modeset_acquire_init(&ctx, 0);
+
+ state = drm_atomic_state_alloc(dev);
+ if (!state) {
+ ret = -ENOMEM;
+ goto out_ctx;
+ }
+
+ state->acquire_ctx = &ctx;
+retry:
+ for (i = 0; i < fb_helper->crtc_count; i++) {
+ struct drm_crtc_state *crtc_state;
+ struct drm_crtc *crtc;
+
+ if (!fb_helper->crtc_info[i].mode_set.mode)
+ continue;
+
+ crtc = fb_helper->crtc_info[i].mode_set.crtc;
+
+ crtc_state = drm_atomic_get_crtc_state(state, crtc);
+ if (IS_ERR(crtc_state)) {
+ ret = PTR_ERR(crtc_state);
+ goto out_state;
+ }
+
+ crtc_state->active = dpms_mode == DRM_MODE_DPMS_ON;
+ }
+
+ ret = drm_atomic_commit(state);
+out_state:
+ if (ret == -EDEADLK)
+ goto backoff;
+
+ drm_atomic_state_put(state);
+out_ctx:
+ drm_modeset_drop_locks(&ctx);
+ drm_modeset_acquire_fini(&ctx);
+
+ return;
+
+backoff:
+ drm_atomic_state_clear(state);
+ drm_modeset_backoff(&ctx);
+
+ goto retry;
+
+}
+
+static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode)
+{
+ struct drm_fb_helper *fb_helper = info->par;
+
+ /*
+ * For each CRTC in this fb, turn the connectors on/off.
+ */
+ mutex_lock(&fb_helper->lock);
+ if (!drm_fb_helper_is_bound(fb_helper)) {
+ mutex_unlock(&fb_helper->lock);
+ return;
+ }
+
+ if (drm_drv_uses_atomic_modeset(fb_helper->dev))
+ dpms_atomic(fb_helper, dpms_mode);
+ else
+ dpms_legacy(fb_helper, dpms_mode);
mutex_unlock(&fb_helper->lock);
}
@@ -2467,7 +2532,6 @@ EXPORT_SYMBOL(drm_fb_helper_initial_config);
*/
int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
{
- struct drm_device *dev = fb_helper->dev;
int err = 0;
if (!drm_fbdev_emulation)
--
2.11.0
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