drm/atomic-helper: Again check modeset *before* plane states
This essentially reverts
commit 934ce1c23624526d9d784e0499190bb48113e6f4
Author: Rob Clark <robdclark@gmail.com>
Date: Wed Nov 19 16:41:33 2014 -0500
drm/atomic: check mode_changed *after* atomic_check
Depending upon the driver both orders (or maybe even interleaving) is
required:
- If ->atomic_check updates ->mode_changed then helper_check_modeset
must be run afters.
- If ->atomic_check depends upon accurate adjusted dotclock values for
e.g. watermarks, then helper_check_modeset must be run first.
The failure mode in the first case is usually a totally angry hw
because the pixel format switching doesn't happen. The failure mode in
the later case is usually nothing, since in most cases the old
adjusted mode from the previous modeset wont be too far off to be a
problem. So just underruns and perhaps even just suboptimal (from a
power consumption) watermarks.
Furthermore in the transitional helpers we only call ->atomic_check
after the new modeset state has been fully set up (and hence
computed).
Given that asymmetry in expected failure modes I think it's safer to
go back to the older order. So do that and give msm a special check
function to compensate.
Also update kerneldoc to explain this a bit.
v2: Actually add the missing hunk Rob spotted.
v3: Move msm_atomic_check into msm_atomic.c, requested by Rob.
Cc: Rob Clark <robdclark@gmail.com>
Reviewed-by: Rob Clark <robdclark@gmail.com>
Tested-by: Rob Clark <robdclark@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index 0cd71da..eb380ee 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -508,6 +508,12 @@
* Drivers without such needs can directly use this as their ->atomic_check()
* callback.
*
+ * This just wraps the two parts of the state checking for planes and modeset
+ * state in the default order: First it calls drm_atomic_helper_check_modeset()
+ * and then drm_atomic_helper_check_planes(). The assumption is that the
+ * ->atomic_check functions depend upon an updated adjusted_mode.clock to
+ * e.g. properly compute watermarks.
+ *
* RETURNS
* Zero for success or -errno
*/
@@ -516,11 +522,11 @@
{
int ret;
- ret = drm_atomic_helper_check_planes(dev, state);
+ ret = drm_atomic_helper_check_modeset(dev, state);
if (ret)
return ret;
- ret = drm_atomic_helper_check_modeset(dev, state);
+ ret = drm_atomic_helper_check_planes(dev, state);
if (ret)
return ret;
diff --git a/drivers/gpu/drm/msm/msm_atomic.c b/drivers/gpu/drm/msm/msm_atomic.c
index f0de412..f8f18e8 100644
--- a/drivers/gpu/drm/msm/msm_atomic.c
+++ b/drivers/gpu/drm/msm/msm_atomic.c
@@ -81,6 +81,26 @@
}
+int msm_atomic_check(struct drm_device *dev,
+ struct drm_atomic_state *state)
+{
+ int ret;
+
+ /*
+ * msm ->atomic_check can update ->mode_changed for pixel format
+ * changes, hence must be run before we check the modeset changes.
+ */
+ ret = drm_atomic_helper_check_planes(dev, state);
+ if (ret)
+ return ret;
+
+ ret = drm_atomic_helper_check_modeset(dev, state);
+ if (ret)
+ return ret;
+
+ return ret;
+}
+
/**
* drm_atomic_helper_commit - commit validated state object
* @dev: DRM device
diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
index d3b791b..473e4d6 100644
--- a/drivers/gpu/drm/msm/msm_drv.c
+++ b/drivers/gpu/drm/msm/msm_drv.c
@@ -29,7 +29,7 @@
static const struct drm_mode_config_funcs mode_config_funcs = {
.fb_create = msm_framebuffer_create,
.output_poll_changed = msm_fb_output_poll_changed,
- .atomic_check = drm_atomic_helper_check,
+ .atomic_check = msm_atomic_check,
.atomic_commit = msm_atomic_commit,
};
diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h
index 1363038..d408e02 100644
--- a/drivers/gpu/drm/msm/msm_drv.h
+++ b/drivers/gpu/drm/msm/msm_drv.h
@@ -144,6 +144,8 @@
(_cb)->func = _func; \
} while (0)
+int msm_atomic_check(struct drm_device *dev,
+ struct drm_atomic_state *state);
int msm_atomic_commit(struct drm_device *dev,
struct drm_atomic_state *state, bool async);