drm/msm/dpu: drop separate dpu_core_perf_tune overrides

The values in struct dpu_core_perf_tune are fixed per the core perf
mode. Drop the 'tune' values and substitute them with known values when
performing perf management.

Note: min_bus_vote was not used at all, so it is just silently dropped.
Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/550208/
Link: https://lore.kernel.org/r/20230730010102.350713-4-dmitry.baryshkov@linaro.org

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

@@ -286,10 +286,16 @@ void dpu_core_perf_crtc_release_bw(struct drm_crtc *crtc)
 
 static u64 _dpu_core_perf_get_core_clk_rate(struct dpu_kms *kms)
 {
-	u64 clk_rate = kms->perf.perf_tune.min_core_clk;
+	u64 clk_rate;
 	struct drm_crtc *crtc;
 	struct dpu_crtc_state *dpu_cstate;
 
+	if (kms->perf.perf_tune.mode == DPU_PERF_MODE_FIXED)
+		return kms->perf.fix_core_clk_rate;
+
+	if (kms->perf.perf_tune.mode == DPU_PERF_MODE_MINIMUM)
+		return kms->perf.max_core_clk_rate;
+
 	drm_for_each_crtc(crtc, kms->dev) {
 		if (crtc->enabled) {
 			dpu_cstate = to_dpu_crtc_state(crtc->state);
@@ -300,11 +306,6 @@ static u64 _dpu_core_perf_get_core_clk_rate(struct dpu_kms *kms)
 		}
 	}
 
-	if (kms->perf.perf_tune.mode == DPU_PERF_MODE_FIXED)
-		clk_rate = kms->perf.fix_core_clk_rate;
-
-	DRM_DEBUG_ATOMIC("clk:%llu\n", clk_rate);
-
 	return clk_rate;
 }
 
@@ -392,6 +393,8 @@ int dpu_core_perf_crtc_update(struct drm_crtc *crtc,
 	if (update_clk) {
 		clk_rate = _dpu_core_perf_get_core_clk_rate(kms);
 
+		DRM_DEBUG_ATOMIC("clk:%llu\n", clk_rate);
+
 		trace_dpu_core_perf_update_clk(kms->dev, stop_req, clk_rate);
 
 		clk_rate = min(clk_rate, kms->perf.max_core_clk_rate);
@@ -413,7 +416,6 @@ static ssize_t _dpu_core_perf_mode_write(struct file *file,
 		    const char __user *user_buf, size_t count, loff_t *ppos)
 {
 	struct dpu_core_perf *perf = file->private_data;
-	const struct dpu_perf_cfg *cfg = perf->catalog->perf;
 	u32 perf_mode = 0;
 	int ret;
 
@@ -428,14 +430,9 @@ static ssize_t _dpu_core_perf_mode_write(struct file *file,
 		DRM_INFO("fix performance mode\n");
 	} else if (perf_mode == DPU_PERF_MODE_MINIMUM) {
 		/* run the driver with max clk and BW vote */
-		perf->perf_tune.min_core_clk = perf->max_core_clk_rate;
-		perf->perf_tune.min_bus_vote =
-				(u64) cfg->max_bw_high * 1000;
 		DRM_INFO("minimum performance mode\n");
 	} else if (perf_mode == DPU_PERF_MODE_NORMAL) {
 		/* reset the perf tune params to 0 */
-		perf->perf_tune.min_core_clk = 0;
-		perf->perf_tune.min_bus_vote = 0;
 		DRM_INFO("normal performance mode\n");
 	}
 	perf->perf_tune.mode = perf_mode;
@@ -451,10 +448,8 @@ static ssize_t _dpu_core_perf_mode_read(struct file *file,
 	char buf[128];
 
 	len = scnprintf(buf, sizeof(buf),
-			"mode %d min_mdp_clk %llu min_bus_vote %llu\n",
-			perf->perf_tune.mode,
-			perf->perf_tune.min_core_clk,
-			perf->perf_tune.min_bus_vote);
+			"mode %d\n",
+			perf->perf_tune.mode);
 
 	return simple_read_from_buffer(buff, count, ppos, buf, len);
 }

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

@@ -29,13 +29,9 @@ struct dpu_core_perf_params {
 /**
  * struct dpu_core_perf_tune - definition of performance tuning control
  * @mode: performance mode
- * @min_core_clk: minimum core clock
- * @min_bus_vote: minimum bus vote
  */
 struct dpu_core_perf_tune {
 	u32 mode;
-	u64 min_core_clk;
-	u64 min_bus_vote;
 };
 
 /**