drm/msm/dpu: move max clock decision to dpu_kms.

dpu_core_perf should not make decisions on the maximum possible core
clock rate. Pass the value from dpu_kms_hw_init() and drop handling of
core_clk from dpu_core_perf.c
Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/550201/
Link: https://lore.kernel.org/r/20230730010102.350713-10-dmitry.baryshkov@linaro.org

drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c

@@ -489,21 +489,14 @@ void dpu_core_perf_destroy(struct dpu_core_perf *perf)
 	}
 
 	perf->max_core_clk_rate = 0;
-	perf->core_clk = NULL;
 }
 
 int dpu_core_perf_init(struct dpu_core_perf *perf,
 		const struct dpu_perf_cfg *perf_cfg,
-		struct clk *core_clk)
+		unsigned long max_core_clk_rate)
 {
 	perf->perf_cfg = perf_cfg;
-	perf->core_clk = core_clk;
-
-	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;
-	}
+	perf->max_core_clk_rate = max_core_clk_rate;
 
 	return 0;
 }

drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.h

@@ -12,8 +12,6 @@
 
 #include "dpu_hw_catalog.h"
 
-#define	DPU_PERF_DEFAULT_MAX_CORE_CLK_RATE	412500000
-
 /**
  * struct dpu_core_perf_params - definition of performance parameters
  * @max_per_pipe_ib: maximum instantaneous bandwidth request
@@ -37,7 +35,6 @@ struct dpu_core_perf_tune {
 /**
  * struct dpu_core_perf - definition of core performance context
  * @perf_cfg: Platform-specific performance configuration
- * @core_clk: Pointer to the core clock
  * @core_clk_rate: current core clock rate
  * @max_core_clk_rate: maximum allowable core clock rate
  * @perf_tune: debug control for performance tuning
@@ -48,7 +45,6 @@ struct dpu_core_perf_tune {
  */
 struct dpu_core_perf {
 	const struct dpu_perf_cfg *perf_cfg;
-	struct clk *core_clk;
 	u64 core_clk_rate;
 	u64 max_core_clk_rate;
 	struct dpu_core_perf_tune perf_tune;
@@ -92,11 +88,11 @@ void dpu_core_perf_destroy(struct dpu_core_perf *perf);
  * dpu_core_perf_init - initialize the given core performance context
  * @perf: Pointer to core performance context
  * @perf_cfg: Pointer to platform performance configuration
- * @core_clk: pointer to core clock
+ * @max_core_clk_rate: Maximum core clock rate
  */
 int dpu_core_perf_init(struct dpu_core_perf *perf,
 		const struct dpu_perf_cfg *perf_cfg,
-		struct clk *core_clk);
+		unsigned long max_core_clk_rate);
 
 struct dpu_kms;
 

drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c

@@ -1052,11 +1052,14 @@ unsigned long dpu_kms_get_clk_rate(struct dpu_kms *dpu_kms, char *clock_name)
 	return clk_get_rate(clk);
 }
 
+#define	DPU_PERF_DEFAULT_MAX_CORE_CLK_RATE	412500000
+
 static int dpu_kms_hw_init(struct msm_kms *kms)
 {
 	struct dpu_kms *dpu_kms;
 	struct drm_device *dev;
 	int i, rc = -EINVAL;
+	unsigned long max_core_clk_rate;
 	u32 core_rev;
 
 	if (!kms) {
@@ -1170,8 +1173,14 @@ static int dpu_kms_hw_init(struct msm_kms *kms)
 		dpu_kms->hw_vbif[vbif->id] = hw;
 	}
 
-	rc = dpu_core_perf_init(&dpu_kms->perf, dpu_kms->catalog->perf,
-			msm_clk_bulk_get_clock(dpu_kms->clocks, dpu_kms->num_clocks, "core"));
+	/* TODO: use the same max_freq as in dpu_kms_hw_init */
+	max_core_clk_rate = dpu_kms_get_clk_rate(dpu_kms, "core");
+	if (!max_core_clk_rate) {
+		DPU_DEBUG("max core clk rate not determined, using default\n");
+		max_core_clk_rate = DPU_PERF_DEFAULT_MAX_CORE_CLK_RATE;
+	}
+
+	rc = dpu_core_perf_init(&dpu_kms->perf, dpu_kms->catalog->perf, max_core_clk_rate);
 	if (rc) {
 		DPU_ERROR("failed to init perf %d\n", rc);
 		goto perf_err;