drm/msm/dpu: Introduce PINGPONG_NONE to disconnect DSC from PINGPONG

Disabling the crossbar mux between DSC and PINGPONG currently
requires a bogus enum dpu_pingpong value to be passed when calling
dsc_bind_pingpong_blk() with enable=false, even though the register
value written is independent of the current PINGPONG block.  Replace
that `bool enable` parameter with a new PINGPONG_NONE dpu_pingpong
flag that triggers the write of the "special" 0xF "crossbar
disabled" value to the register instead.

Changes in v4:
-- more details to commit text

Changes in v5:
-- rewording commit text suggested by Marijn
-- add DRM_DEBUG_KMS for DSC unbinding case

Changes in v8:
-- fix checkpatch warning

Signed-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Marijn Suijten <marijn.suijten@somainline.org>
Patchwork: https://patchwork.freedesktop.org/patch/539505/
Link: https://lore.kernel.org/r/1685036458-22683-6-git-send-email-quic_khsieh@quicinc.com
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
index d7cd473..9e0b630 100644 (file)
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
@@ -1850,7 +1850,7 @@ static void dpu_encoder_dsc_pipe_cfg(struct dpu_hw_dsc *hw_dsc,
                hw_pp->ops.setup_dsc(hw_pp);
 
        if (hw_dsc->ops.dsc_bind_pingpong_blk)
-               hw_dsc->ops.dsc_bind_pingpong_blk(hw_dsc, true, hw_pp->idx);
+               hw_dsc->ops.dsc_bind_pingpong_blk(hw_dsc, hw_pp->idx);
 
        if (hw_pp->ops.enable_dsc)
                hw_pp->ops.enable_dsc(hw_pp);

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_dsc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_dsc.c
index 89e1a9f..6484791 100644 (file)
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_dsc.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_dsc.c
@@ -154,7 +154,6 @@ static void dpu_hw_dsc_config_thresh(struct dpu_hw_dsc *hw_dsc,
 
 static void dpu_hw_dsc_bind_pingpong_blk(
                struct dpu_hw_dsc *hw_dsc,
-               bool enable,
                const enum dpu_pingpong pp)
 {
        struct dpu_hw_blk_reg_map *c = &hw_dsc->hw;
@@ -163,14 +162,15 @@ static void dpu_hw_dsc_bind_pingpong_blk(
 
        dsc_ctl_offset = DSC_CTL(hw_dsc->idx);
 
-       if (enable)
+       if (pp)
                mux_cfg = (pp - PINGPONG_0) & 0x7;
 
-       DRM_DEBUG_KMS("%s dsc:%d %s pp:%d\n",
-                       enable ? "Binding" : "Unbinding",
-                       hw_dsc->idx - DSC_0,
-                       enable ? "to" : "from",
-                       pp - PINGPONG_0);
+       if (pp)
+               DRM_DEBUG_KMS("Binding dsc:%d to pp:%d\n",
+                             hw_dsc->idx - DSC_0, pp - PINGPONG_0);
+       else
+               DRM_DEBUG_KMS("Unbinding dsc:%d from any pp\n",
+                             hw_dsc->idx - DSC_0);
 
        DPU_REG_WRITE(c, dsc_ctl_offset, mux_cfg);
 }

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_dsc.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_dsc.h
index 287ec5f..138080a 100644 (file)
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_dsc.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_dsc.h
@@ -44,7 +44,6 @@ struct dpu_hw_dsc_ops {
                                  struct drm_dsc_config *dsc);
 
        void (*dsc_bind_pingpong_blk)(struct dpu_hw_dsc *hw_dsc,
-                                 bool enable,
                                  enum dpu_pingpong pp);
 };