On 7/9/2024 6:48 AM, Dmitry Baryshkov wrote:
In order to prevent any errors on connector being disabled, move the
state->crtc check upfront. This should fix the issues during suspend
when the writeback connector gets forcebly disabled.
Fixes: 71174f362d67 ("drm/msm/dpu: move writeback's atomic_check to dpu_writeback.c")
Cc: stable@xxxxxxxxxxxxxxx
Reported-by: Leonard Lausen <leonard@xxxxxxxxx>
Closes: https://gitlab.freedesktop.org/drm/msm/-/issues/57
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
---
drivers/gpu/drm/msm/disp/dpu1/dpu_writeback.c | 14 +++++++-------
1 file changed, 7 insertions(+), 7 deletions(-)
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_writeback.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_writeback.c
index 16f144cbc0c9..5c172bcf3419 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_writeback.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_writeback.c
@@ -39,6 +39,13 @@ static int dpu_wb_conn_atomic_check(struct drm_connector *connector,
DPU_DEBUG("[atomic_check:%d]\n", connector->base.id);
+ crtc = conn_state->crtc;
We are checking for !conn_state a few lines below but we are
dereferencing conn_state here.
This is bound to hit a smatch error and also does not look right.
If conn_state will always be valid, we should drop that check too rather
than checking it later.
Coming to the issue itself, I tried checking the logs but it was not clear.
During force disable, were we hitting below check and hence the
connector was not getting disabled?
else if (conn_state->connector->status != connector_status_connected) {
DPU_ERROR("connector not connected %d\n",
conn_state->connector->status);
return -EINVAL;
}
I did not see this error log there, so can you pls explain where we were
bailing out? The check seems valid to me.
+ if (!crtc)
+ return 0;
+
+ if (!conn_state->writeback_job || !conn_state->writeback_job->fb)
+ return 0;
+
if (!conn_state || !conn_state->connector) {
DPU_ERROR("invalid connector state\n");
return -EINVAL;
@@ -47,13 +54,6 @@ static int dpu_wb_conn_atomic_check(struct drm_connector *connector,
return -EINVAL;
}
- crtc = conn_state->crtc;
- if (!crtc)
- return 0;
-
- if (!conn_state->writeback_job || !conn_state->writeback_job->fb)
- return 0;
-
crtc_state = drm_atomic_get_crtc_state(state, crtc);
if (IS_ERR(crtc_state))
return PTR_ERR(crtc_state);
