Re: [REPOST PATCH v4 08/13] drm/msm/disp/dpu1: Don't use DSC with mode_3d

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On 2/16/2022 10:10 PM, Vinod Koul wrote:
On 16-02-22, 19:11, Abhinav Kumar wrote:


On 2/10/2022 2:34 AM, Vinod Koul wrote:
We cannot enable mode_3d when we are using the DSC. So pass
configuration to detect DSC is enabled and not enable mode_3d
when we are using DSC

We add a helper dpu_encoder_helper_get_dsc() to detect dsc
enabled and pass this to .setup_intf_cfg()

Signed-off-by: Vinod Koul <vkoul@xxxxxxxxxx>

We should not use 3D mux only when we use DSC merge topology.
I agree that today we use only 2-2-1 topology for DSC which means its using
DSC merge.

But generalizing that 3D mux should not be used for DSC is not right.

You can detect DSC merge by checking if there are two encoders and one
interface in the topology and if so, you can disable 3D mux.

Right now with DSC we disable that as suggested by Dmitry last time.
Whenever we introduce merge we should revisit this, for now this should
suffice


Sorry I didnt follow.

The topology which you are supporting today IS DSC merge 2-2-1. I didnt get what you mean by "whenever we introduce".

I didnt follow Dmitry's comment either.

"anybody adding support for SDE_RM_TOPOLOGY_DUALPIPE_3DMERGE_DSC handle this."

3D mux shouldnt be used when DSC merge is used.

The topology Dmitry is referring to will not use DSC merge but you are using it here and thats why you had to make this patch in the first place. So I am not sure why would someone who uses 3D merge topology worry about DSC merge. Your patch is the one which deals with the topology in question.

What I am suggesting is a small but necessary improvement to this patch.

All that you have to do is in query whether DSC merge is used from the topology. You can do it in multiple ways:

1) Either query this from the encoder
2) Store a bool "dsc_merge" in the intf_cfg




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