On 30/07/2023 22:52, Marijn Suijten wrote:
On 2023-07-30 03:35:18, Dmitry Baryshkov wrote:
As the INTF is fixed at the encoder creation time, we can move the
check whether INTF supports tearchck to dpu_encoder_phys_cmd_init().
This function can return an error if INTF doesn't have required feature.
Performing this check in dpu_encoder_phys_cmd_tearcheck_config() is less
useful, as this function returns void.
Signed-off-by: Dmitry Baryshkov <dmitry.barysh...@linaro.org>
---
.../drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c | 41 +++++++++++--------
1 file changed, 25 insertions(+), 16 deletions(-)
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c
b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c
index 012986cff38c..adbd559a5290 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c
@@ -325,24 +325,21 @@ static void dpu_encoder_phys_cmd_tearcheck_config(
unsigned long vsync_hz;
struct dpu_kms *dpu_kms;
- if (phys_enc->has_intf_te) {
- if (!phys_enc->hw_intf ||
- !phys_enc->hw_intf->ops.enable_tearcheck) {
- DPU_DEBUG_CMDENC(cmd_enc, "tearcheck not supported\n");
- return;
- }
-
- DPU_DEBUG_CMDENC(cmd_enc, "");
- } else {
- if (!phys_enc->hw_pp ||
- !phys_enc->hw_pp->ops.enable_tearcheck) {
- DPU_DEBUG_CMDENC(cmd_enc, "tearcheck not supported\n");
- return;
- }
-
- DPU_DEBUG_CMDENC(cmd_enc, "pp %d\n", phys_enc->hw_pp->idx -
PINGPONG_0);
+ /*
+ * TODO: if/when resource allocation is refactored, move this to a
+ * place where the driver can actually return an error.
+ */
+ if (!phys_enc->has_intf_te &&
+ (!phys_enc->hw_pp ||
+ !phys_enc->hw_pp->ops.enable_tearcheck)) {
We're probably overdoing it here if I request a WARN_ON when has_intf_te
is true while enable_tearcheck is also non-NULL?
+ DPU_DEBUG_CMDENC(cmd_enc, "tearcheck not supported\n");
+ return;
}
+ DPU_DEBUG_CMDENC(cmd_enc, "intf %d pp %d\n",
+ phys_enc->hw_intf->idx - INTF_0,
+ phys_enc->hw_pp->idx - PINGPONG_0);
Note that hw_pp wasn't printed when has_intf_te is true. And it doesn't
seem like that pointer is dereferenced anywhere in that case, perhaps
hw_pp may even be NULL within dpu_encoder_phys_cmd_tearcheck_config() at
some point.
No, if I understand correctly. It is only called from
_dpu_encoder_phys_cmd_pingpong_config(), which checks for hw_pp. One can
not run CMD mode display without a pingpong block anyway.
+
mode = &phys_enc->cached_mode;
dpu_kms = phys_enc->dpu_kms;
@@ -768,10 +765,22 @@ struct dpu_encoder_phys *dpu_encoder_phys_cmd_init(
phys_enc->intf_mode = INTF_MODE_CMD;
cmd_enc->stream_sel = 0;
+ if (!phys_enc->hw_intf) {
+ DPU_ERROR_CMDENC(cmd_enc, "no INTF provided\n");
+
No need for this newline?
I just usually insert an empty line before return. Let's remove it.
+ return ERR_PTR(-EINVAL);
+ }
+
/* DPU before 5.0 use PINGPONG for TE handling */
if (phys_enc->dpu_kms->catalog->mdss_ver->core_major_ver >= 5)
phys_enc->has_intf_te = true;
+ if (phys_enc->has_intf_te && !phys_enc->hw_intf->ops.enable_tearcheck) {
+ DPU_ERROR_CMDENC(cmd_enc, "tearcheck not supported\n");
+
Same here?
- Marijn
+ return ERR_PTR(-EINVAL);
+ }
+
atomic_set(&cmd_enc->pending_vblank_cnt, 0);
init_waitqueue_head(&cmd_enc->pending_vblank_wq);
--
2.39.2
--
With best wishes
Dmitry
