On 21/02/2023 20:42, Jessica Zhang wrote:
Currently, DPU will enable TE during prepare_commit(). However, this
will cause a crash and reboot to sahara when trying to read/write to
register in get_autorefresh_config(), because the core clock rates
aren't set at that time.
This used to work because phys_enc->hw_pp is only initialized in mode
set [1], so the first prepare_commit() will return before any register
read/write as hw_pp would be NULL.
However, when we try to implement support for INTF TE, we will run into
the clock issue described above as hw_intf will *not* be NULL on the
first prepare_commit(). This is because the initialization of
dpu_enc->hw_intf has been moved to dpu_encoder_setup() [2].
To avoid this issue, let's enable TE during prepare_for_kickoff()
instead as the core clock rates are guaranteed to be set then.
Depends on: "Implement tearcheck support on INTF block" [3]
Changes in V3:
- Added function prototypes
- Reordered function definitions to make change more legible
- Removed prepare_commit() function from dpu_encoder_phys_cmd
Changes in V4:
- Reworded commit message to be more specific
- Removed dpu_encoder_phys_cmd_is_ongoing_pptx() prototype
[1]
https://gitlab.freedesktop.org/drm/msm/-/blob/msm-next/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c#L1109
[2]
https://gitlab.freedesktop.org/drm/msm/-/blob/msm-next/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c#L2339
[3] https://patchwork.freedesktop.org/series/112332/
Signed-off-by: Jessica Zhang <[email protected]>
---
drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
Reviewed-by: Dmitry Baryshkov <[email protected]>
--
With best wishes
Dmitry
