[PATCH v4 3/6] drm/msm/dpu: Use OPP API to set clk/perf state

[Rajendra Nayak]

On some qualcomm platforms DPU needs to express a performance state
requirement on a power domain depending on the clock rates.
Use OPP table from DT to register with OPP framework and use
dev_pm_opp_set_rate() to set the clk/perf state.

Signed-off-by: Rajendra Nayak <rnayak@xxxxxxxxxxxxxx>
Reviewed-by: Rob Clark <robdclark@xxxxxxxxxxxx>
Reviewed-by: Matthias Kaehlcke <mka@xxxxxxxxxxxx>
Cc: Rob Clark <robdclark@xxxxxxxxx>
Cc: Sean Paul <sean@xxxxxxxxxx>
Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c |  3 ++-
 drivers/gpu/drm/msm/disp/dpu1/dpu_io_util.c   | 33 ---------------------------
 drivers/gpu/drm/msm/disp/dpu1/dpu_io_util.h   |  1 -
 drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c       | 25 +++++++++++++++++++-
 drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h       |  4 ++++
 5 files changed, 30 insertions(+), 36 deletions(-)

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 11f2beb..fe5717df 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c
@@ -7,6 +7,7 @@
 #include <linux/debugfs.h>
 #include <linux/errno.h>
 #include <linux/mutex.h>
+#include <linux/pm_opp.h>
 #include <linux/sort.h>
 #include <linux/clk.h>
 #include <linux/bitmap.h>
@@ -239,7 +240,7 @@ static int _dpu_core_perf_set_core_clk_rate(struct dpu_kms *kms, u64 rate)
 		rate = core_clk->max_rate;
 
 	core_clk->rate = rate;
-	return msm_dss_clk_set_rate(core_clk, 1);
+	return dev_pm_opp_set_rate(&kms->pdev->dev, core_clk->rate);
 }
 
 static u64 _dpu_core_perf_get_core_clk_rate(struct dpu_kms *kms)
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_io_util.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_io_util.c
index 078afc5..b9a4bf8 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_io_util.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_io_util.c
@@ -51,39 +51,6 @@ int msm_dss_get_clk(struct device *dev, struct dss_clk *clk_arry, int num_clk)
 	return rc;
 }
 
-int msm_dss_clk_set_rate(struct dss_clk *clk_arry, int num_clk)
-{
-	int i, rc = 0;
-
-	for (i = 0; i < num_clk; i++) {
-		if (clk_arry[i].clk) {
-			if (clk_arry[i].type != DSS_CLK_AHB) {
-				DEV_DBG("%pS->%s: '%s' rate %ld\n",
-					__builtin_return_address(0), __func__,
-					clk_arry[i].clk_name,
-					clk_arry[i].rate);
-				rc = clk_set_rate(clk_arry[i].clk,
-					clk_arry[i].rate);
-				if (rc) {
-					DEV_ERR("%pS->%s: %s failed. rc=%d\n",
-						__builtin_return_address(0),
-						__func__,
-						clk_arry[i].clk_name, rc);
-					break;
-				}
-			}
-		} else {
-			DEV_ERR("%pS->%s: '%s' is not available\n",
-				__builtin_return_address(0), __func__,
-				clk_arry[i].clk_name);
-			rc = -EPERM;
-			break;
-		}
-	}
-
-	return rc;
-}
-
 int msm_dss_enable_clk(struct dss_clk *clk_arry, int num_clk, int enable)
 {
 	int i, rc = 0;
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_io_util.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_io_util.h
index e6b5c77..ca25c90 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_io_util.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_io_util.h
@@ -33,7 +33,6 @@ struct dss_module_power {
 
 int msm_dss_get_clk(struct device *dev, struct dss_clk *clk_arry, int num_clk);
 void msm_dss_put_clk(struct dss_clk *clk_arry, int num_clk);
-int msm_dss_clk_set_rate(struct dss_clk *clk_arry, int num_clk);
 int msm_dss_enable_clk(struct dss_clk *clk_arry, int num_clk, int enable);
 int msm_dss_parse_clock(struct platform_device *pdev,
 		struct dss_module_power *mp);
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
index ce19f1d..f16d715 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
@@ -10,6 +10,7 @@
 #include <linux/debugfs.h>
 #include <linux/dma-buf.h>
 #include <linux/of_irq.h>
+#include <linux/pm_opp.h>
 
 #include <drm/drm_crtc.h>
 #include <drm/drm_file.h>
@@ -1033,11 +1034,23 @@ static int dpu_bind(struct device *dev, struct device *master, void *data)
 	if (!dpu_kms)
 		return -ENOMEM;
 
+	dpu_kms->opp_table = dev_pm_opp_set_clkname(dev, "core");
+	if (IS_ERR(dpu_kms->opp_table))
+		return PTR_ERR(dpu_kms->opp_table);
+	/* OPP table is optional */
+	ret = dev_pm_opp_of_add_table(dev);
+	if (!ret) {
+		dpu_kms->has_opp_table = true;
+	} else if (ret != -ENODEV) {
+		dev_err(dev, "invalid OPP table in device tree\n");
+		return ret;
+	}
+
 	mp = &dpu_kms->mp;
 	ret = msm_dss_parse_clock(pdev, mp);
 	if (ret) {
 		DPU_ERROR("failed to parse clocks, ret=%d\n", ret);
-		return ret;
+		goto err;
 	}
 
 	platform_set_drvdata(pdev, dpu_kms);
@@ -1051,6 +1064,11 @@ static int dpu_bind(struct device *dev, struct device *master, void *data)
 
 	priv->kms = &dpu_kms->base;
 	return ret;
+err:
+	if (dpu_kms->has_opp_table)
+		dev_pm_opp_of_remove_table(dev);
+	dev_pm_opp_put_clkname(dpu_kms->opp_table);
+	return ret;
 }
 
 static void dpu_unbind(struct device *dev, struct device *master, void *data)
@@ -1059,6 +1077,9 @@ static void dpu_unbind(struct device *dev, struct device *master, void *data)
 	struct dpu_kms *dpu_kms = platform_get_drvdata(pdev);
 	struct dss_module_power *mp = &dpu_kms->mp;
 
+	if (dpu_kms->has_opp_table)
+		dev_pm_opp_of_remove_table(dev);
+	dev_pm_opp_put_clkname(dpu_kms->opp_table);
 	msm_dss_put_clk(mp->clk_config, mp->num_clk);
 	devm_kfree(&pdev->dev, mp->clk_config);
 	mp->num_clk = 0;
@@ -1090,6 +1111,8 @@ static int __maybe_unused dpu_runtime_suspend(struct device *dev)
 	struct dpu_kms *dpu_kms = platform_get_drvdata(pdev);
 	struct dss_module_power *mp = &dpu_kms->mp;
 
+	/* Drop the performance state vote */
+	dev_pm_opp_set_rate(dev, 0);
 	rc = msm_dss_enable_clk(mp->clk_config, mp->num_clk, false);
 	if (rc)
 		DPU_ERROR("clock disable failed rc:%d\n", rc);
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h
index 211f5de9..2a52e4e 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h
@@ -128,6 +128,10 @@ struct dpu_kms {
 
 	struct platform_device *pdev;
 	bool rpm_enabled;
+
+	struct opp_table *opp_table;
+	bool has_opp_table;
+
 	struct dss_module_power mp;
 
 	/* reference count bandwidth requests, so we know when we can
-- 
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