Re: [v1] drm/msm/disp/dpu1: add support for hierarchical flush for dspp in sc7280

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On 08/08/2022 13:44, Kalyan Thota wrote:




-----Original Message-----
From: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
Sent: Thursday, August 4, 2022 9:29 PM
To: Kalyan Thota (QUIC) <quic_kalyant@xxxxxxxxxxx>
Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx; linux-arm-msm@xxxxxxxxxxxxxxx;
freedreno@xxxxxxxxxxxxxxxxxxxxx; devicetree@xxxxxxxxxxxxxxx; linux-
kernel@xxxxxxxxxxxxxxx; robdclark@xxxxxxxxx; dianders@xxxxxxxxxxxx;
swboyd@xxxxxxxxxxxx; Vinod Polimera (QUIC) <quic_vpolimer@xxxxxxxxxxx>;
Abhinav Kumar (QUIC) <quic_abhinavk@xxxxxxxxxxx>
Subject: Re: [v1] drm/msm/disp/dpu1: add support for hierarchical flush for dspp
in sc7280

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On Thu, 4 Aug 2022 at 13:29, Kalyan Thota <quic_kalyant@xxxxxxxxxxx> wrote:


Flush mechanism for DSPP blocks has changed in sc7280 family, it
allows individual sub blocks to be flushed in coordination with master
flush control.

representation: master_flush && (PCC_flush | IGC_flush .. etc )

This change adds necessary support for the above design.

Signed-off-by: Kalyan Thota <quic_kalyant@xxxxxxxxxxx>


I'd like to land at least patches 6-8 from [1] next cycle. They clean up the CTL
interface. Could you please rebase your patch on top of them?



Sure I'll wait for the series to rebase. @Doug can you comment if this is okay and this patch is not needed immediately ?
The respective patches have been picked up for 6.1 and were pushed to https://gitlab.freedesktop.org/lumag/msm.git msm-next-lumag . Could you please rebase your patch on top of them? 

All other comments also needs addressing.




[1] https://patchwork.freedesktop.org/series/99909/


---
  drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c       |  4 +++
  drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c |  5 +++-
drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h |  2 ++
  drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c     | 40

+++++++++++++++++++++++++-

  drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.h     |  3 ++
  drivers/gpu/drm/msm/disp/dpu1/dpu_hw_mdss.h    |  7 +++++
  6 files changed, 59 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
index 7763558..4eca317 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
@@ -703,6 +703,10 @@ static void _dpu_crtc_setup_cp_blocks(struct

drm_crtc *crtc)

                 mixer[i].flush_mask |= ctl->ops.get_bitmask_dspp(ctl,
                         mixer[i].hw_dspp->idx);

+               if(ctl->ops.set_dspp_hierarchical_flush)
+                       ctl->ops.set_dspp_hierarchical_flush(ctl,
+                                               mixer[i].hw_dspp->idx,
+ DSPP_SUB_PCC);
+
                 /* stage config flush mask */
                 ctl->ops.update_pending_flush(ctl,
mixer[i].flush_mask);

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c
b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c
index 021eb2f..3b27a87 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c
@@ -58,7 +58,10 @@
         (PINGPONG_SDM845_MASK | BIT(DPU_PINGPONG_TE2))

  #define CTL_SC7280_MASK \
-       (BIT(DPU_CTL_ACTIVE_CFG) | BIT(DPU_CTL_FETCH_ACTIVE) |

BIT(DPU_CTL_VM_CFG))

+       (BIT(DPU_CTL_ACTIVE_CFG) | \
+        BIT(DPU_CTL_FETCH_ACTIVE) | \
+        BIT(DPU_CTL_VM_CFG) | \
+        BIT(DPU_CTL_HIERARCHICAL_FLUSH))

  #define MERGE_3D_SM8150_MASK (0)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
index b85b24b..7922f6c 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
@@ -185,6 +185,7 @@ enum {
   * @DPU_CTL_SPLIT_DISPLAY:     CTL supports video mode split display
   * @DPU_CTL_FETCH_ACTIVE:      Active CTL for fetch HW (SSPPs)
   * @DPU_CTL_VM_CFG:            CTL config to support multiple VMs
+ * @DPU_CTL_HIERARCHICAL_FLUSH: CTL config to support hierarchical
+ flush
   * @DPU_CTL_MAX
   */
  enum {
@@ -192,6 +193,7 @@ enum {
         DPU_CTL_ACTIVE_CFG,
         DPU_CTL_FETCH_ACTIVE,
         DPU_CTL_VM_CFG,
+       DPU_CTL_HIERARCHICAL_FLUSH,
         DPU_CTL_MAX
  };

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 3584f5e..b34fc30 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c
@@ -28,6 +28,8 @@
  #define   CTL_INTF_FLUSH                0x110
  #define   CTL_INTF_MASTER               0x134
  #define   CTL_FETCH_PIPE_ACTIVE         0x0FC
+#define   CTL_DSPP_0_FLUSH             0x13C


Please change to CTL_DSPP_n_FLUSH(n).


+

  #define CTL_MIXER_BORDER_OUT            BIT(24)
  #define CTL_FLUSH_MASK_CTL              BIT(17)
@@ -292,6 +294,36 @@ static uint32_t dpu_hw_ctl_get_bitmask_dspp(struct

dpu_hw_ctl *ctx,

         return flushbits;
  }

+static uint32_t dpu_hw_ctl_get_bitmask_dspp_v1(struct dpu_hw_ctl *ctx,
+       enum dpu_dspp dspp)
+{
+       return BIT(29);
+}
+
+static void dpu_hw_ctl_set_dspp_hierarchical_flush(struct dpu_hw_ctl *ctx,
+       enum dpu_dspp dspp, enum dpu_dspp_sub_blk dspp_sub_blk) {
+       uint32_t flushbits = 0, active = 0;
+
+       switch (dspp_sub_blk) {
+       case DSPP_SUB_IGC:
+               flushbits = BIT(2);
+               break;
+       case DSPP_SUB_PCC:
+               flushbits = BIT(4);
+               break;
+       case DSPP_SUB_GC:
+               flushbits = BIT(5);
+               break;
+       default:
+               return;
+       }
+
+       active = DPU_REG_READ(&ctx->hw, CTL_DSPP_0_FLUSH + ((dspp - 1)
+ * 4));


So that this line will be simpler to read.


+
+       DPU_REG_WRITE(&ctx->hw, CTL_DSPP_0_FLUSH + ((dspp - 1) * 4),
+active | flushbits); }
+
  static u32 dpu_hw_ctl_poll_reset_status(struct dpu_hw_ctl *ctx, u32
timeout_us)  {
         struct dpu_hw_blk_reg_map *c = &ctx->hw; @@ -600,7 +632,13 @@
static void _setup_ctl_ops(struct dpu_hw_ctl_ops *ops,
         ops->setup_blendstage = dpu_hw_ctl_setup_blendstage;
         ops->get_bitmask_sspp = dpu_hw_ctl_get_bitmask_sspp;
         ops->get_bitmask_mixer = dpu_hw_ctl_get_bitmask_mixer;
-       ops->get_bitmask_dspp = dpu_hw_ctl_get_bitmask_dspp;
+       if (cap & BIT(DPU_CTL_HIERARCHICAL_FLUSH)) {
+               ops->get_bitmask_dspp =
+ dpu_hw_ctl_get_bitmask_dspp_v1;


We have used _v1 for active CTLs. What is the relationship between
CTL_HIERARCHILCAL_FLUSH and active CTLs?

Active CTL design replaces legacy CTL_MEM_SEL, CTL_OUT_SEL registers in grouping the resources such as WB, INTF, pingpong, DSC etc into the data path
DSPP hierarchical flush will gives us a finer control on which post processing blocks to be flushed as part of the composition ( like IGC, PCC, GC .. etc )
These blocks are contained in DSPP package.
So, I assume that hierarchical DSPP flush does not exist on non-active CTL SoCs. Which supported SoCs do support the hierarchichal DSPP flush? 




+               ops->set_dspp_hierarchical_flush =

dpu_hw_ctl_set_dspp_hierarchical_flush;

+       } else {
+               ops->get_bitmask_dspp = dpu_hw_ctl_get_bitmask_dspp;
+       }
+
         if (cap & BIT(DPU_CTL_FETCH_ACTIVE))
                 ops->set_active_pipes =
dpu_hw_ctl_set_fetch_pipe_active;  }; 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 ac15444..8ecab91 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.h
@@ -160,6 +160,9 @@ struct dpu_hw_ctl_ops {
         uint32_t (*get_bitmask_dspp)(struct dpu_hw_ctl *ctx,
                 enum dpu_dspp blk);

+       void (*set_dspp_hierarchical_flush)(struct dpu_hw_ctl *ctx,
+               enum dpu_dspp blk, enum dpu_dspp_sub_blk
+ dspp_sub_blk);


The word "hierarchical" means particular (internal) implementation.
Please change to something like set_dspp_block_flush().
Or with [2] in place, it can be hidden in the
update_pending_flush_dspp() function. Just pass the subblock to the function and
let the dpu_hw_ctl care about it.

[2] https://patchwork.freedesktop.org/patch/473159/?series=99909&rev=1



+
         /**
          * Set all blend stages to disabled
          * @ctx       : ctl path ctx pointer
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_mdss.h
b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_mdss.h
index bb9cead..561e2ab 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_mdss.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_mdss.h
@@ -166,6 +166,13 @@ enum dpu_dspp {
         DSPP_MAX
  };

+enum dpu_dspp_sub_blk{
+       DSPP_SUB_PCC = 1,
+       DSPP_SUB_IGC,
+       DSPP_SUB_GC,
+       DSPP_SUB_MAX
+};


I'd prefer if we can use DPU_DSPP_* definitions instead.


+
  enum dpu_ctl {
         CTL_0 = 1,
         CTL_1,




--
With best wishes
Dmitry


--
With best wishes
Dmitry
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