Op 29-06-17 om 13:00 schreef Daniel Vetter:
> On Thu, Jun 29, 2017 at 12:58 PM, Maarten Lankhorst
> <maarten.lankhorst@xxxxxxxxxxxxxxx> wrote:
>> Op 29-06-17 om 12:31 schreef Daniel Vetter:
>>> On Thu, Jun 29, 2017 at 12:22 PM, Maarten Lankhorst
>>> <maarten.lankhorst@xxxxxxxxxxxxxxx> wrote:
>>>>> +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;
>>>>> + }
>>>> Hm, maybe remove the early continue, and change this to if (crtc_state->enable) crtc_state->active = ...; ?
>>>>
>>>> I don't know if it matters in practice, but it might be more resilient when crtc state does not match our expected state,
>>>> similar to how DPMS on is ignored without CRTC.
>>> I just blindly smashed the old fbdev code in with the helper and moved
>>> the locking out. Not sure what would be better here, since the
>>> continue is in a way just part of a non-existent
>>> drm_fb_helper_for_each_active_crtc loop iterator. Not sure it's worth
>>> it to overpolish this code to such an extent :-)
>>> -Daniel
>> Well checking for crtc_state->enable instead of mode_set.mode probably means we're at least bug for bug
>> compatible vs legacy. It might be better to add a bool active to restore_fbdev_mode_atomic.
>>
>> What about something like this? The less atomic commits the better. :)
> Hm yeah, that sounds like a useful simplification. I don't think we
> should do too much into extremes in fbdev and only have 1 atomic
> commit, because fbdev fundamentally isn't atomic. But merging them
> where it makes sense is reasonable.
> -Daniel
Agreed, perhaps with pan_display_atomic too, if we no longer use modeset locks,
then it becomes very simple..
What about getting rid of that one too, in favor of this?
diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index 0cd2035ac1d1..b4356fdf5e6d 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -1557,70 +1557,36 @@ int drm_fb_helper_set_par(struct fb_info *info)
}
EXPORT_SYMBOL(drm_fb_helper_set_par);
-static int pan_display_atomic(struct fb_var_screeninfo *var,
- struct fb_info *info)
+static void pan_set(struct drm_fb_helper *fb_helper, int x, int y)
{
- struct drm_fb_helper *fb_helper = info->par;
- struct drm_device *dev = fb_helper->dev;
- struct drm_atomic_state *state;
- struct drm_plane *plane;
- int i, ret;
- unsigned int plane_mask;
- 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;
- }
+ int i;
- state->acquire_ctx = &ctx;
-retry:
- plane_mask = 0;
for (i = 0; i < fb_helper->crtc_count; i++) {
struct drm_mode_set *mode_set;
mode_set = &fb_helper->crtc_info[i].mode_set;
- mode_set->x = var->xoffset;
- mode_set->y = var->yoffset;
-
- ret = __drm_atomic_helper_set_config(mode_set, state);
- if (ret != 0)
- goto out_state;
-
- plane = mode_set->crtc->primary;
- plane_mask |= (1 << drm_plane_index(plane));
- plane->old_fb = plane->fb;
+ mode_set->x = x;
+ mode_set->y = y;
}
+}
- ret = drm_atomic_commit(state);
- if (ret != 0)
- goto out_state;
-
- info->var.xoffset = var->xoffset;
- info->var.yoffset = var->yoffset;
+static int pan_display_atomic(struct fb_var_screeninfo *var,
+ struct fb_info *info)
+{
+ struct drm_fb_helper *fb_helper = info->par;
+ int ret;
-out_state:
- drm_atomic_clean_old_fb(dev, plane_mask, ret);
+ pan_set(fb_helper, var->xoffset, var->yoffset);
- if (ret == -EDEADLK)
- goto backoff;
-
- drm_atomic_state_put(state);
-out_ctx:
- drm_modeset_drop_locks(&ctx);
- drm_modeset_acquire_fini(&ctx);
+ ret = restore_fbdev_mode(fb_helper);
+ if (!ret) {
+ info->var.xoffset = var->xoffset;
+ info->var.yoffset = var->yoffset;
+ } else
+ pan_set(fb_helper, info->var.xoffset, info->var.yoffset);
return ret;
-
-backoff:
- drm_atomic_state_clear(state);
- drm_modeset_backoff(&ctx);
-
- goto retry;
}
static int pan_display_legacy(struct fb_var_screeninfo *var,
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