Hi,
On 07/04/2018 10:35 AM, Daniel Vetter wrote:
On Tue, Jul 03, 2018 at 09:14:50PM +0200, Thomas Hellstrom wrote:
From: Sinclair Yeh <syeh@xxxxxxxxxx>
vmw_kms_atomic_check_modeset() is currently checking config using the
legacy state, which is updated after a commit has happened.
This means vmw_kms_atomic_check_modeset() will reject an invalid config
on the next update rather than the current one.
Fix this by using the new states for config checking
Signed-off-by: Sinclair Yeh <syeh@xxxxxxxxxx>
Reviewed-by: Deepak Rawat <drawat@xxxxxxxxxx>
Signed-off-by: Thomas Hellstrom <thellstrom@xxxxxxxxxx>
---
drivers/gpu/drm/vmwgfx/vmwgfx_kms.c | 40 +++++++++++++++++++----------
1 file changed, 26 insertions(+), 14 deletions(-)
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
index e7a7a2e73bbf..6b8541f9215d 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
@@ -1526,33 +1526,45 @@ static int
vmw_kms_atomic_check_modeset(struct drm_device *dev,
struct drm_atomic_state *state)
{
- struct drm_crtc_state *crtc_state;
+ struct drm_crtc_state *new_crtc_state;
+ struct drm_plane_state *new_plane_state;
+ struct drm_plane *plane;
struct drm_crtc *crtc;
struct vmw_private *dev_priv = vmw_priv(dev);
- int i;
+ int i, ret, cpp = 0;
- for_each_new_crtc_in_state(state, crtc, crtc_state, i) {
- unsigned long requested_bb_mem = 0;
+ ret = drm_atomic_helper_check(dev, state);
- if (dev_priv->active_display_unit == vmw_du_screen_target) {
- struct drm_plane *plane = crtc->primary;
- struct drm_plane_state *plane_state;
+ /* If this is not a STDU, then no more checking is necessary */
+ if (ret || dev_priv->active_display_unit != vmw_du_screen_target)
+ return ret;
- plane_state = drm_atomic_get_new_plane_state(state, plane);
+ for_each_new_plane_in_state(state, plane, new_plane_state, i) {
+ if (new_plane_state->fb) {
+ int current_cpp = new_plane_state->fb->pitches[0] /
+ new_plane_state->fb->width;
- if (plane_state && plane_state->fb) {
- int cpp = plane_state->fb->format->cpp[0];
+ if (cpp == 0)
+ cpp = current_cpp;
+ else if (current_cpp != cpp)
+ return -EINVAL;
+ }
+ }
- requested_bb_mem += crtc->mode.hdisplay * cpp *
- crtc->mode.vdisplay;
- }
+ for_each_new_crtc_in_state(state, crtc, new_crtc_state, i) {
Note that the above too loops only walk over the changed states (by
default), not all planes/crtc. You either need to add them yourself (which
kinda defeats the point of the per-plane/crtc locks for doing pageflips in
parallel). Or you need to track things in a driver private structure
(which you'll only grab on modesets) and just update the delta.
I didn't check the entire code to see whether this is a real problem for
you, just wanted to point this out.
-Daniel
Thanks for pointing this out. This is actually addressed in a later
patch by Deepak which chooses the second alternative. We should perhaps
have squashed these patches, but keeping track internally becomes easier
this way.
/Thomas
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