Commit 5c2e3448 authored by Daniel Vetter's avatar Daniel Vetter
Browse files

drm/fb-helper: Push locking into pan_display_atomic|legacy 



For the legacy path we'll keep drm_modeset_lock_all, for the atomic
one we drop the use of the magic implicit context and wire it up
properly.

Cc: John Stultz <john.stultz@linaro.org>
Cc: Thierry Reding <treding@nvidia.com>
Reviewed-by: default avatarMaarten Lankhorst <maarten.lankhorst@intel.com>
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170704151833.17304-7-daniel.vetter@ffwll.ch
parent 235d3e4f

drivers/gpu/drm/drm_fb_helper.c

+18 −10
Original line number Diff line number Diff line
@@ -1317,7 +1317,6 @@ int drm_fb_helper_ioctl(struct fb_info *info, unsigned int cmd, 
			unsigned long arg)

{

	struct drm_fb_helper *fb_helper = info->par;

	struct drm_device *dev = fb_helper->dev;

	struct drm_mode_set *mode_set;

	struct drm_crtc *crtc;

	int ret = 0;
@@ -1508,12 +1507,17 @@ static int pan_display_atomic(struct fb_var_screeninfo *var, 
	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)

		return -ENOMEM;

	if (!state) {

		ret = -ENOMEM;

		goto out_ctx;

	}



	state->acquire_ctx = dev->mode_config.acquire_ctx;

	state->acquire_ctx = &ctx;

retry:

	plane_mask = 0;

	for (i = 0; i < fb_helper->crtc_count; i++) {
@@ -1526,7 +1530,7 @@ retry: 


		ret = __drm_atomic_helper_set_config(mode_set, state);

		if (ret != 0)

			goto fail;

			goto out_state;



		plane = mode_set->crtc->primary;

		plane_mask |= (1 << drm_plane_index(plane));
@@ -1535,23 +1539,27 @@ retry: 


	ret = drm_atomic_commit(state);

	if (ret != 0)

		goto fail;

		goto out_state;



	info->var.xoffset = var->xoffset;

	info->var.yoffset = var->yoffset;



fail:

out_state:

	drm_atomic_clean_old_fb(dev, plane_mask, ret);



	if (ret == -EDEADLK)

		goto backoff;



	drm_atomic_state_put(state);

out_ctx:

	drm_modeset_drop_locks(&ctx);

	drm_modeset_acquire_fini(&ctx);



	return ret;



backoff:

	drm_atomic_state_clear(state);

	drm_atomic_legacy_backoff(state);

	drm_modeset_backoff(&ctx);



	goto retry;

}
@@ -1564,6 +1572,7 @@ static int pan_display_legacy(struct fb_var_screeninfo *var, 
	int ret = 0;

	int i;



	drm_modeset_lock_all(fb_helper->dev);

	for (i = 0; i < fb_helper->crtc_count; i++) {

		modeset = &fb_helper->crtc_info[i].mode_set;
@@ -1578,6 +1587,7 @@ static int pan_display_legacy(struct fb_var_screeninfo *var, 
			}

		}

	}

	drm_modeset_unlock_all(fb_helper->dev);



	return ret;

}
@@ -1603,12 +1613,10 @@ int drm_fb_helper_pan_display(struct fb_var_screeninfo *var, 
		return -EBUSY;

	}



	drm_modeset_lock_all(dev);

	if (drm_drv_uses_atomic_modeset(dev))

		ret = pan_display_atomic(var, info);

	else

		ret = pan_display_legacy(var, info);

	drm_modeset_unlock_all(dev);

	mutex_unlock(&fb_helper->lock);



	return ret;

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