Re: [PATCH] drm/msm/dpu: update the qos remap only if the client type changes

Mon, 23 Nov 2020 16:39:06 -0800 

Hi Rob

On 2020-11-23 15:18, Rob Clark wrote:
On Thu, Nov 19, 2020 at 1:41 PM Abhinav Kumar <abhin...@codeaurora.org> wrote: 

Update the qos remap only if the client type changes for the plane.
This will avoid unnecessary register programming and also avoid log
spam from the dpu_vbif_set_qos_remap() function.

Signed-off-by: Abhinav Kumar <abhin...@codeaurora.org>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c    | 17 +++++++++++++++++
 drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h    |  7 +++++++
 drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c |  2 ++
 drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c   | 12 ++++++++++--
 drivers/gpu/drm/msm/disp/dpu1/dpu_plane.h   |  5 +++++
 5 files changed, 41 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 d4662e8184cc..3867da47c683 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c

@@ -1037,6 +1037,23 @@ static int dpu_crtc_atomic_check(struct 
drm_crtc *crtc,

        return rc;
 }

+void dpu_crtc_set_qos_dirty(struct drm_crtc *crtc)
+{
+       struct drm_plane *plane;
+       struct drm_plane_state *state;
+       struct dpu_plane_state *pstate;
+
+       drm_atomic_crtc_for_each_plane(plane, crtc) {
+               state = plane->state;
+               if (!state)
+                       continue;
+
+               pstate = to_dpu_plane_state(state);
+
+               pstate->dirty |= DPU_PLANE_DIRTY_QOS;
+       }
+}
+
 int dpu_crtc_vblank(struct drm_crtc *crtc, bool en)
 {
        struct dpu_crtc *dpu_crtc = to_dpu_crtc(crtc);

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h 
b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h

index cec3474340e8..8ba11de605bc 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h

@@ -231,6 +231,13 @@ static inline int dpu_crtc_frame_pending(struct 
drm_crtc *crtc)

  */
 int dpu_crtc_vblank(struct drm_crtc *crtc, bool en);

+/**
+ * dpu_crtc_set_qos_dirty - update plane dirty flag to include
+ * QoS reprogramming
+ * @crtc: Pointer to drm crtc structure
+ */
+void dpu_crtc_set_qos_dirty(struct drm_crtc *crtc);
+
 /**

  * dpu_crtc_vblank_callback - called on vblank irq, issues completion 
events

  * @crtc: Pointer to drm crtc object

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c 
b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c

index f7f5c258b553..c2db9dd6ec67 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c

@@ -1001,6 +1001,8 @@ static void dpu_encoder_virt_mode_set(struct 
drm_encoder *drm_enc,


        trace_dpu_enc_mode_set(DRMID(drm_enc));

+       dpu_crtc_set_qos_dirty(drm_enc->crtc);
+

        if (drm_enc->encoder_type == DRM_MODE_ENCODER_TMDS && 
priv->dp)
                msm_dp_display_mode_set(priv->dp, drm_enc, mode, 
adj_mode);



diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c 
b/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c

index 7ea90d25a3b6..f91d31a31e14 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c

@@ -1066,6 +1066,7 @@ static void dpu_plane_sspp_atomic_update(struct 
drm_plane *plane)

        struct dpu_plane_state *pstate = to_dpu_plane_state(state);
        struct drm_crtc *crtc = state->crtc;
        struct drm_framebuffer *fb = state->fb;
+       bool is_rt_pipe;
        const struct dpu_format *fmt =
                to_dpu_format(msm_framebuffer_format(fb));


@@ -1075,7 +1076,7 @@ static void dpu_plane_sspp_atomic_update(struct 
drm_plane *plane)


        pstate->pending = true;


-       pdpu->is_rt_pipe = (dpu_crtc_get_client_type(crtc) != 
NRT_CLIENT);

+       is_rt_pipe = (dpu_crtc_get_client_type(crtc) != NRT_CLIENT);

        _dpu_plane_set_qos_ctrl(plane, false, 
DPU_PLANE_QOS_PANIC_CTRL);



        DPU_DEBUG_PLANE(pdpu, "FB[%u] " DRM_RECT_FP_FMT "->crtc%u " 
DRM_RECT_FMT
@@ -1181,8 +1182,15 @@ static void dpu_plane_sspp_atomic_update(struct 
drm_plane *plane)

                _dpu_plane_set_ot_limit(plane, crtc);
        }

-       _dpu_plane_set_qos_remap(plane);
+       if (is_rt_pipe != pdpu->is_rt_pipe) {
+               pdpu->is_rt_pipe = is_rt_pipe;
+               pstate->dirty |= DPU_PLANE_DIRTY_QOS;
+       }

+       if (pstate->dirty & DPU_PLANE_DIRTY_QOS) {
+               _dpu_plane_set_qos_remap(plane);
+               pstate->dirty = 0x0;
+       }


So in the end, this looks roughly like "set qos remap on modesets or
switching between right/left pipe"?  Couldn't this be simpler if in
plane->atomic_check() you do something like:

   dpu_plane_state->needs_qos_remap = atomic_state->allow_modeset;

and then in plane->atomic_update:

    if (pstate->needs_qos_remap || (is_rt_pipe != pdpu->is_rt_pipe) {
         pdpu->is_rt_pipe = is_rt_pipe;
         _dpu_plane_set_qos_remap(plane)
    }

?

BR,
-R

Thanks for the suggestion, Yes this will make it much simpler. Let me 
update it.


Just one clarification, I believe you meant that

dpu_plane_state->needs_qos_remap = 
drm_atomic_crtc_needs_modeset(crtc_state)


and then the rest of it looks fine to me.





        _dpu_plane_calc_bw(plane, fb);

        _dpu_plane_calc_clk(plane);

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.h 
b/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.h

index ca83b8753d59..47abd3686a86 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.h
@@ -14,11 +14,15 @@
 #include "dpu_hw_mdss.h"
 #include "dpu_hw_sspp.h"

+/* dirty bits to update QOS */
+#define DPU_PLANE_DIRTY_QOS 0x1
+
 /**

  * struct dpu_plane_state: Define dpu extension of drm plane state 
object

  * @base:      base drm plane state object
  * @aspace:    pointer to address space for input/output buffers
  * @stage:     assigned by crtc blender

+ * @dirty:     bitmask for which pipe h/w config functions need to be 
updated

  * @multirect_index: index of the rectangle of SSPP
  * @multirect_mode: parallel or time multiplex multirect mode
  * @pending:   whether the current update is still pending
@@ -32,6 +36,7 @@ struct dpu_plane_state {
        struct drm_plane_state base;
        struct msm_gem_address_space *aspace;
        enum dpu_stage stage;
+       uint32_t dirty;
        uint32_t multirect_index;
        uint32_t multirect_mode;
        bool pending;
--

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Forum,

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