drm/msm/dpu: Delete bonkers code

dpu_crtc_atomic_flush() was directly poking it's attached planes in a
code path that ended up in dpu_plane_atomic_update(), even if the plane
was not involved in the current atomic update.  While a bit dubious,
this worked before because plane->state would always point to something
valid.  But now using drm_atomic_get_new_plane_state() we could get a
NULL state pointer instead, leading to:

   [   20.873273] Call trace:
   [   20.875740]  dpu_plane_atomic_update+0x5c/0xed0
   [   20.880311]  dpu_plane_restore+0x40/0x88
   [   20.884266]  dpu_crtc_atomic_flush+0xf4/0x208
   [   20.888660]  drm_atomic_helper_commit_planes+0x150/0x238
   [   20.894014]  msm_atomic_commit_tail+0x1d4/0x7a0
   [   20.898579]  commit_tail+0xa4/0x168
   [   20.902102]  drm_atomic_helper_commit+0x164/0x178
   [   20.906841]  drm_atomic_commit+0x54/0x60
   [   20.910798]  drm_atomic_connector_commit_dpms+0x10c/0x118
   [   20.916236]  drm_mode_obj_set_property_ioctl+0x1e4/0x440
   [   20.921588]  drm_connector_property_set_ioctl+0x60/0x88
   [   20.926852]  drm_ioctl_kernel+0xd0/0x120
   [   20.930807]  drm_ioctl+0x21c/0x478
   [   20.934235]  __arm64_sys_ioctl+0xa8/0xe0
   [   20.938193]  invoke_syscall+0x64/0x130
   [   20.941977]  el0_svc_common.constprop.3+0x5c/0xe0
   [   20.946716]  do_el0_svc+0x80/0xa0
   [   20.950058]  el0_svc+0x20/0x30
   [   20.953145]  el0_sync_handler+0x88/0xb0
   [   20.957014]  el0_sync+0x13c/0x140

The reason for the codepath seems dubious, the atomic suspend/resume
heplers should handle the power-collapse case.  If not, the CRTC's
atomic_check() should be adding the planes to the atomic update.

Reported-by: Stephen Boyd <swboyd@chromium.org>
Reported-by: John Stultz <john.stultz@linaro.org>
Fixes: 37418bf14c13 ("drm: Use state helper instead of the plane state pointer")
Tested-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Rob Clark <robdclark@chromium.org>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://patchwork.freedesktop.org/patch/msgid/20210430171744.1721408-1-robdclark@gmail.com

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
index 9607a76..e65ff81 100644 (file)
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
@@ -566,16 +566,6 @@ static void dpu_crtc_atomic_flush(struct drm_crtc *crtc,
        if (unlikely(!cstate->num_mixers))
                return;
 
-       /*
-        * For planes without commit update, drm framework will not add
-        * those planes to current state since hardware update is not
-        * required. However, if those planes were power collapsed since
-        * last commit cycle, driver has to restore the hardware state
-        * of those planes explicitly here prior to plane flush.
-        */
-       drm_atomic_crtc_for_each_plane(plane, crtc)
-               dpu_plane_restore(plane, state);
-
        /* update performance setting before crtc kickoff */
        dpu_core_perf_crtc_update(crtc, 1, false);
 

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c
index df7f3d3..7a99354 100644 (file)
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c
@@ -1258,22 +1258,6 @@ static void dpu_plane_atomic_update(struct drm_plane *plane,
        }
 }
 
-void dpu_plane_restore(struct drm_plane *plane, struct drm_atomic_state *state)
-{
-       struct dpu_plane *pdpu;
-
-       if (!plane || !plane->state) {
-               DPU_ERROR("invalid plane\n");
-               return;
-       }
-
-       pdpu = to_dpu_plane(plane);
-
-       DPU_DEBUG_PLANE(pdpu, "\n");
-
-       dpu_plane_atomic_update(plane, state);
-}
-
 static void dpu_plane_destroy(struct drm_plane *plane)
 {
        struct dpu_plane *pdpu = plane ? to_dpu_plane(plane) : NULL;

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.h
index 03b6365..34e03ac 100644 (file)
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.h
@@ -85,12 +85,6 @@ void dpu_plane_get_ctl_flush(struct drm_plane *plane, struct dpu_hw_ctl *ctl,
                u32 *flush_sspp);
 
 /**
- * dpu_plane_restore - restore hw state if previously power collapsed
- * @plane: Pointer to drm plane structure
- */
-void dpu_plane_restore(struct drm_plane *plane, struct drm_atomic_state *state);
-
-/**
  * dpu_plane_flush - final plane operations before commit flush
  * @plane: Pointer to drm plane structure
  */