Re: [PATCH v2 06/11] drm/msm/disp/dpu1: Don't use DSC with mode_3d

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On 20/10/2021 09:57, Vinod Koul wrote:
On 14-10-21, 16:50, Dmitry Baryshkov wrote:
On 14/10/2021 16:41, Dmitry Baryshkov wrote:
On 07/10/2021 10:08, 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_mode() to detect dsc
enabled and pass this to .setup_intf_cfg()

Signed-off-by: Vinod Koul <vkoul@xxxxxxxxxx>
---
Changes since
v1:
   - Move this patch from 7 to 6
   - Update the changelog
   - Make dsc as int and store the DSC indices

   drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h     | 11 +++++++++++
   drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c |  2 ++
   drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c           |  5 +++--
   drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.h           |  2 ++
   4 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h
b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h
index e7270eb6b84b..fca07ed03317 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h
@@ -332,6 +332,17 @@ static inline enum dpu_3d_blend_mode
dpu_encoder_helper_get_3d_blend_mode(
       return BLEND_3D_NONE;
   }
+static inline bool dpu_encoder_helper_get_dsc_mode(struct
dpu_encoder_phys *phys_enc)
+{
+    struct drm_encoder *drm_enc = phys_enc->parent;
+    struct msm_drm_private *priv = drm_enc->dev->dev_private;
+
+    if (priv->dsc)
+        return BIT(0) | BIT(1); /* Hardcoding for 2 DSC topology */

Please use defined values here rater than just BIT().

Ah, it's a list of DSC blocks used. So the function name is misleading (as
it's not a mode). I think we'd better pass DSC_n names here. What about
using an array for cfg->dsc?

Yeah I can do better names.



+
+    return 0;
+}
+
   /**
    * dpu_encoder_helper_split_config - split display configuration
helper function
    *    This helper function may be used by physical encoders to
configure
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 aa01698d6b25..8e5c0911734c 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
@@ -70,6 +70,8 @@ static void _dpu_encoder_phys_cmd_update_intf_cfg(
       intf_cfg.intf_mode_sel = DPU_CTL_MODE_SEL_CMD;
       intf_cfg.stream_sel = cmd_enc->stream_sel;
       intf_cfg.mode_3d = dpu_encoder_helper_get_3d_blend_mode(phys_enc);
+    intf_cfg.dsc = dpu_encoder_helper_get_dsc_mode(phys_enc);
+
       ctl->ops.setup_intf_cfg(ctl, &intf_cfg);
   }
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c
b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c
index 64740ddb983e..3c79bd9c2fe5 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c
@@ -118,7 +118,7 @@ static u32 dpu_hw_ctl_get_pending_flush(struct
dpu_hw_ctl *ctx)
       return ctx->pending_flush_mask;
   }
-static inline void dpu_hw_ctl_trigger_flush_v1(struct dpu_hw_ctl *ctx)
+static void dpu_hw_ctl_trigger_flush_v1(struct dpu_hw_ctl *ctx)
   {
       if (ctx->pending_flush_mask & BIT(MERGE_3D_IDX))
@@ -519,7 +519,8 @@ static void dpu_hw_ctl_intf_cfg(struct
dpu_hw_ctl *ctx,
       intf_cfg |= (cfg->intf & 0xF) << 4;
-    if (cfg->mode_3d) {
+    /* In DSC we can't set merge, so check for dsc too */
+    if (cfg->mode_3d && !cfg->dsc) {

The more I think about this hunk, the more I'm unsure about it.
Downstream has the following topoligies defined:
   * @SDE_RM_TOPOLOGY_DUALPIPE_3DMERGE_DSC: 2 LM, 2 PP, 3DMux, 1 DSC, 1
INTF/WB
   * @SDE_RM_TOPOLOGY_QUADPIPE_3DMERGE_DSC  4 LM, 4 PP, 3DMux, 3 DSC, 2 INTF

While the latter is not supported on sdm845, the former one should be
(by the hardware). So in the driver I think we should make sure that
mode_3d does not get set rather than disallowing it here.

           intf_cfg |= BIT(19);
           intf_cfg |= (cfg->mode_3d - 0x1) << 20;
       }
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.h
b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.h
index 806c171e5df2..5dfac5994bd4 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.h
@@ -39,6 +39,7 @@ struct dpu_hw_stage_cfg {
    * @mode_3d:               3d mux configuration
    * @merge_3d:              3d merge block used
    * @intf_mode_sel:         Interface mode, cmd / vid
+ * @dsc:                   DSC BIT masks
    * @stream_sel:            Stream selection for multi-stream interfaces
    */
   struct dpu_hw_intf_cfg {
@@ -46,6 +47,7 @@ struct dpu_hw_intf_cfg {
       enum dpu_3d_blend_mode mode_3d;
       enum dpu_merge_3d merge_3d;
       enum dpu_ctl_mode_sel intf_mode_sel;
+    unsigned int dsc;

I think this should be:
enum dpu_dsc dsc[MAX_DSCS];
unsigned int num_dsc;

hmmm, how do we go about getting the num_dsc value here.
dpu_encoder_phys does not know about that..


dpu_encoder_get_topology() can decide whether to use DSC or not and then set num_dsc. For now it will always set 2 if we are using DSC at all, but let's keep the decision in a single place rather than having it scattered all over the driver.


--
With best wishes
Dmitry



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