[PATCH v2 05/17] drm/msm/dpu: Use OPP API to set clk/perf state

[PATCH v2 05/17] drm/msm/dpu: Use OPP API to set clk/perf state

[Rajendra Nayak]

On some qualcomm platforms DPU needs to express a perforamnce state
requirement on a power domain depennding 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@codeaurora.org>
Cc: Rob Clark <robdclark@gmail.com>
Cc: Sean Paul <sean@poorly.run>
Cc: dri-devel@lists.freedesktop.org
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c |  3 ++-
 drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c       | 20 +++++++++++++++++++-
 drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h       |  4 ++++
 3 files changed, 25 insertions(+), 2 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_kms.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
index ce19f1d..cfce642 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 +1034,18 @@ static int dpu_bind(struct device *dev, struct device *master, void *data)
 	if (!dpu_kms)
 		return -ENOMEM;
 
+	dpu_kms->opp = dev_pm_opp_set_clkname(dev, "core");
+	if (IS_ERR(dpu_kms->opp))
+		return PTR_ERR(dpu_kms->opp);
+	/* OPP table is optional */
+	if (!dev_pm_opp_of_add_table(dev))
+		dpu_kms->opp_table = true;
+
 	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 +1059,11 @@ static int dpu_bind(struct device *dev, struct device *master, void *data)
 
 	priv->kms = &dpu_kms->base;
 	return ret;
+err:
+	if (dpu_kms->opp_table)
+		dev_pm_opp_of_remove_table(dev);
+	dev_pm_opp_put_clkname(dpu_kms->opp);
+	return ret;
 }
 
 static void dpu_unbind(struct device *dev, struct device *master, void *data)
@@ -1059,6 +1072,9 @@ 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->opp_table)
+		dev_pm_opp_of_remove_table(dev);
+	dev_pm_opp_put_clkname(dpu_kms->opp);
 	msm_dss_put_clk(mp->clk_config, mp->num_clk);
 	devm_kfree(&pdev->dev, mp->clk_config);
 	mp->num_clk = 0;
@@ -1090,6 +1106,8 @@ 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..0060709 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;
+	bool opp_table;
+
 	struct dss_module_power mp;
 
 	/* reference count bandwidth requests, so we know when we can
-- 
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of Code Aurora Forum, hosted by The Linux Foundation
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Re: [PATCH v2 05/17] drm/msm/dpu: Use OPP API to set clk/perf state

[Matthias Kaehlcke]

Hi Rajendra,

I have essentially the same comments as for "tty: serial: qcom_geni_serial:
Use OPP API to set clk/perf state" (https://patchwork.kernel.org/patch/11495209/).
about error handling of 'dev_pm_opp_of_add_table' and misleading struct
member names 'opp'/'opp_table'. Please apply the requested changes to the
entire series unless you disagree (we can keep the discussion in the patch
referenced above).

On Fri, Apr 17, 2020 at 07:34:27PM +0530, Rajendra Nayak wrote:
> On some qualcomm platforms DPU needs to express a perforamnce state
> requirement on a power domain depennding 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@codeaurora.org>
> Cc: Rob Clark <robdclark@gmail.com>
> Cc: Sean Paul <sean@poorly.run>
> Cc: dri-devel@lists.freedesktop.org
> ---
>  drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c |  3 ++-
>  drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c       | 20 +++++++++++++++++++-
>  drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h       |  4 ++++
>  3 files changed, 25 insertions(+), 2 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_kms.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
> index ce19f1d..cfce642 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 +1034,18 @@ static int dpu_bind(struct device *dev, struct device *master, void *data)
>  	if (!dpu_kms)
>  		return -ENOMEM;
>  
> +	dpu_kms->opp = dev_pm_opp_set_clkname(dev, "core");
> +	if (IS_ERR(dpu_kms->opp))
> +		return PTR_ERR(dpu_kms->opp);
> +	/* OPP table is optional */
> +	if (!dev_pm_opp_of_add_table(dev))
> +		dpu_kms->opp_table = true;
> +
>  	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 +1059,11 @@ static int dpu_bind(struct device *dev, struct device *master, void *data)
>  
>  	priv->kms = &dpu_kms->base;
>  	return ret;
> +err:
> +	if (dpu_kms->opp_table)
> +		dev_pm_opp_of_remove_table(dev);
> +	dev_pm_opp_put_clkname(dpu_kms->opp);
> +	return ret;
>  }
>  
>  static void dpu_unbind(struct device *dev, struct device *master, void *data)
> @@ -1059,6 +1072,9 @@ 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->opp_table)
> +		dev_pm_opp_of_remove_table(dev);
> +	dev_pm_opp_put_clkname(dpu_kms->opp);
>  	msm_dss_put_clk(mp->clk_config, mp->num_clk);
>  	devm_kfree(&pdev->dev, mp->clk_config);
>  	mp->num_clk = 0;
> @@ -1090,6 +1106,8 @@ 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..0060709 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;
> +	bool opp_table;
> +
>  	struct dss_module_power mp;
>  
>  	/* reference count bandwidth requests, so we know when we can
> -- 
> QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member
> of Code Aurora Forum, hosted by The Linux Foundation
_______________________________________________
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Re: [PATCH v2 05/17] drm/msm/dpu: Use OPP API to set clk/perf state

[Rajendra Nayak]

On 4/17/2020 11:47 PM, Matthias Kaehlcke wrote:
> Hi Rajendra,
> 
> I have essentially the same comments as for "tty: serial: qcom_geni_serial:
> Use OPP API to set clk/perf state" (https://patchwork.kernel.org/patch/11495209/).
> about error handling of 'dev_pm_opp_of_add_table' and misleading struct
> member names 'opp'/'opp_table'. Please apply the requested changes to the
> entire series unless you disagree (we can keep the discussion in the patch
> referenced above).

Thanks, yes, I will apply those changes across the series and respin.
Will wait a few days to see I get any more feedback.

-- 
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of Code Aurora Forum, hosted by The Linux Foundation
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[PATCH v2 06/17] drm/msm: dsi: Use OPP API to set clk/perf state

[Rajendra Nayak]

On SDM845 DSI needs to express a perforamnce 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@codeaurora.org>
Cc: Rob Clark <robdclark@gmail.com>
Cc: Sean Paul <sean@poorly.run>
Cc: dri-devel@lists.freedesktop.org
---
 drivers/gpu/drm/msm/dsi/dsi.h      |  2 ++
 drivers/gpu/drm/msm/dsi/dsi_cfg.c  |  4 +--
 drivers/gpu/drm/msm/dsi/dsi_host.c | 53 ++++++++++++++++++++++++++++++++++++++
 3 files changed, 57 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/msm/dsi/dsi.h b/drivers/gpu/drm/msm/dsi/dsi.h
index 4de771d..ba7583c 100644
--- a/drivers/gpu/drm/msm/dsi/dsi.h
+++ b/drivers/gpu/drm/msm/dsi/dsi.h
@@ -180,10 +180,12 @@ int msm_dsi_runtime_suspend(struct device *dev);
 int msm_dsi_runtime_resume(struct device *dev);
 int dsi_link_clk_set_rate_6g(struct msm_dsi_host *msm_host);
 int dsi_link_clk_set_rate_v2(struct msm_dsi_host *msm_host);
+int dsi_link_clk_set_rate_6g_v2(struct msm_dsi_host *msm_host);
 int dsi_link_clk_enable_6g(struct msm_dsi_host *msm_host);
 int dsi_link_clk_enable_v2(struct msm_dsi_host *msm_host);
 void dsi_link_clk_disable_6g(struct msm_dsi_host *msm_host);
 void dsi_link_clk_disable_v2(struct msm_dsi_host *msm_host);
+void dsi_link_clk_disable_6g_v2(struct msm_dsi_host *msm_host);
 int dsi_tx_buf_alloc_6g(struct msm_dsi_host *msm_host, int size);
 int dsi_tx_buf_alloc_v2(struct msm_dsi_host *msm_host, int size);
 void *dsi_tx_buf_get_6g(struct msm_dsi_host *msm_host);
diff --git a/drivers/gpu/drm/msm/dsi/dsi_cfg.c b/drivers/gpu/drm/msm/dsi/dsi_cfg.c
index 813d69d..773c4fe 100644
--- a/drivers/gpu/drm/msm/dsi/dsi_cfg.c
+++ b/drivers/gpu/drm/msm/dsi/dsi_cfg.c
@@ -210,9 +210,9 @@ static const struct msm_dsi_host_cfg_ops msm_dsi_6g_host_ops = {
 };
 
 static const struct msm_dsi_host_cfg_ops msm_dsi_6g_v2_host_ops = {
-	.link_clk_set_rate = dsi_link_clk_set_rate_6g,
+	.link_clk_set_rate = dsi_link_clk_set_rate_6g_v2,
 	.link_clk_enable = dsi_link_clk_enable_6g,
-	.link_clk_disable = dsi_link_clk_disable_6g,
+	.link_clk_disable = dsi_link_clk_disable_6g_v2,
 	.clk_init_ver = dsi_clk_init_6g_v2,
 	.tx_buf_alloc = dsi_tx_buf_alloc_6g,
 	.tx_buf_get = dsi_tx_buf_get_6g,
diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c
index 11ae5b8..d532fab 100644
--- a/drivers/gpu/drm/msm/dsi/dsi_host.c
+++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
@@ -14,6 +14,7 @@
 #include <linux/of_graph.h>
 #include <linux/of_irq.h>
 #include <linux/pinctrl/consumer.h>
+#include <linux/pm_opp.h>
 #include <linux/regmap.h>
 #include <linux/regulator/consumer.h>
 #include <linux/spinlock.h>
@@ -111,6 +112,9 @@ struct msm_dsi_host {
 	struct clk *pixel_clk_src;
 	struct clk *byte_intf_clk;
 
+	struct opp_table *opp;
+	bool opp_table;
+
 	u32 byte_clk_rate;
 	u32 pixel_clk_rate;
 	u32 esc_clk_rate;
@@ -537,6 +541,38 @@ int dsi_link_clk_set_rate_6g(struct msm_dsi_host *msm_host)
 	return 0;
 }
 
+int dsi_link_clk_set_rate_6g_v2(struct msm_dsi_host *msm_host)
+{
+	int ret;
+	struct device *dev = &msm_host->pdev->dev;
+
+	DBG("Set clk rates: pclk=%d, byteclk=%d",
+		msm_host->mode->clock, msm_host->byte_clk_rate);
+
+	ret = dev_pm_opp_set_rate(dev, msm_host->byte_clk_rate);
+	if (ret) {
+		pr_err("%s: dev_pm_opp_set_rate failed %d\n", __func__, ret);
+		return ret;
+	}
+
+	ret = clk_set_rate(msm_host->pixel_clk, msm_host->pixel_clk_rate);
+	if (ret) {
+		pr_err("%s: Failed to set rate pixel clk, %d\n", __func__, ret);
+		return ret;
+	}
+
+	if (msm_host->byte_intf_clk) {
+		ret = clk_set_rate(msm_host->byte_intf_clk,
+				   msm_host->byte_clk_rate / 2);
+		if (ret) {
+			pr_err("%s: Failed to set rate byte intf clk, %d\n",
+			       __func__, ret);
+			return ret;
+		}
+	}
+
+	return 0;
+}
 
 int dsi_link_clk_enable_6g(struct msm_dsi_host *msm_host)
 {
@@ -665,6 +701,13 @@ void dsi_link_clk_disable_6g(struct msm_dsi_host *msm_host)
 	clk_disable_unprepare(msm_host->byte_clk);
 }
 
+void dsi_link_clk_disable_6g_v2(struct msm_dsi_host *msm_host)
+{
+	/* Drop the performance state vote */
+	dev_pm_opp_set_rate(&msm_host->pdev->dev, 0);
+	dsi_link_clk_disable_6g(msm_host);
+}
+
 void dsi_link_clk_disable_v2(struct msm_dsi_host *msm_host)
 {
 	clk_disable_unprepare(msm_host->pixel_clk);
@@ -1879,6 +1922,13 @@ int msm_dsi_host_init(struct msm_dsi *msm_dsi)
 		goto fail;
 	}
 
+	msm_host->opp = dev_pm_opp_set_clkname(&pdev->dev, "byte");
+	if (IS_ERR(msm_host->opp))
+		return PTR_ERR(msm_host->opp);
+	/* OPP table is optional */
+	if (!dev_pm_opp_of_add_table(&pdev->dev))
+		msm_host->opp_table = true;
+
 	init_completion(&msm_host->dma_comp);
 	init_completion(&msm_host->video_comp);
 	mutex_init(&msm_host->dev_mutex);
@@ -1904,6 +1954,9 @@ void msm_dsi_host_destroy(struct mipi_dsi_host *host)
 	struct msm_dsi_host *msm_host = to_msm_dsi_host(host);
 
 	DBG("");
+	if (msm_host->opp_table)
+		dev_pm_opp_of_remove_table(&msm_host->pdev->dev);
+	dev_pm_opp_put_clkname(msm_host->opp);
 	dsi_tx_buf_free(msm_host);
 	if (msm_host->workqueue) {
 		flush_workqueue(msm_host->workqueue);
-- 
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member
of Code Aurora Forum, hosted by The Linux Foundation
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