Re: [PATCH v4 1/2] drm/msm/dpu: simplify clocks handling

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On 16/02/2022 05:31, Stephen Boyd wrote:
Quoting Dmitry Baryshkov (2022-01-31 13:05:12)
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c
index 60fe06018581..4d184122d63e 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c
@@ -405,10 +394,11 @@ int dpu_core_perf_crtc_update(struct drm_crtc *crtc,

                 trace_dpu_core_perf_update_clk(kms->dev, stop_req, clk_rate);

-               ret = _dpu_core_perf_set_core_clk_rate(kms, clk_rate);
+               if (clk_rate > kms->perf.max_core_clk_rate)
+                       clk_rate = kms->perf.max_core_clk_rate;

Using

	clk_rate = min(clk_rate, kms->perf.max_core_clk_rate)

would be type safer. And min_t() would be explicit if the types don't
match, but we should try to make them be compatible.

Ack


+               ret = dev_pm_opp_set_rate(&kms->pdev->dev, clk_rate);
                 if (ret) {
-                       DPU_ERROR("failed to set %s clock rate %llu\n",
-                                       kms->perf.core_clk->clk_name, clk_rate);
+                       DPU_ERROR("failed to set core clock rate %llu\n", clk_rate);
                         return ret;
                 }

@@ -529,13 +519,13 @@ void dpu_core_perf_destroy(struct dpu_core_perf *perf)
  int dpu_core_perf_init(struct dpu_core_perf *perf,
                 struct drm_device *dev,
                 struct dpu_mdss_cfg *catalog,
-               struct dss_clk *core_clk)
+               struct clk *core_clk)
  {
         perf->dev = dev;
         perf->catalog = catalog;
         perf->core_clk = core_clk;

-       perf->max_core_clk_rate = core_clk->max_rate;
+       perf->max_core_clk_rate = clk_get_rate(core_clk);
         if (!perf->max_core_clk_rate) {
                 DPU_DEBUG("optional max core clk rate, use default\n");
                 perf->max_core_clk_rate = DPU_PERF_DEFAULT_MAX_CORE_CLK_RATE;
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h
index 2d385b4b7f5e..5f562413bb63 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h
@@ -21,7 +21,6 @@
  #include "dpu_hw_lm.h"
  #include "dpu_hw_interrupts.h"
  #include "dpu_hw_top.h"
-#include "dpu_io_util.h"
  #include "dpu_rm.h"
  #include "dpu_core_perf.h"

@@ -113,7 +112,8 @@ struct dpu_kms {
         struct platform_device *pdev;
         bool rpm_enabled;

-       struct dss_module_power mp;
+       struct clk_bulk_data *clocks;
+       int num_clocks;

size_t?


         /* reference count bandwidth requests, so we know when we can
          * release bandwidth.  Each atomic update increments, and frame-
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c
index 131c1f1a869c..8c038416e119 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c
@@ -29,7 +29,8 @@ struct dpu_irq_controller {
  struct dpu_mdss {
         struct msm_mdss base;
         void __iomem *mmio;
-       struct dss_module_power mp;
+       struct clk_bulk_data *clocks;
+       int num_clocks;

size_t?

         struct dpu_irq_controller irq_controller;
  };



--
With best wishes
Dmitry



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