[RFC,06/19] devfreq: imx8m-ddrc: Use the opps acquired from EL3
diff mbox series

Message ID 1613750416-11901-7-git-send-email-abel.vesa@nxp.com
State New, archived
Headers show
Series
  • Rework support for i.MX8MQ interconnect with devfreq
Related show

Commit Message

Abel Vesa Feb. 19, 2021, 4 p.m. UTC
i.MX8M platforms get their dram OPPs from the EL3.
We don't need to duplicate that in the kernel dram dts node.
We should just trust the OPPs provided by the EL3.

Signed-off-by: Abel Vesa <abel.vesa@nxp.com>
---
 drivers/devfreq/imx8m-ddrc.c | 49 ++----------------------------------
 1 file changed, 2 insertions(+), 47 deletions(-)

Comments

Chanwoo Choi Feb. 26, 2021, 3:12 p.m. UTC | #1
Hi,

On 21. 2. 20. 오전 1:00, Abel Vesa wrote:
> i.MX8M platforms get their dram OPPs from the EL3.
> We don't need to duplicate that in the kernel dram dts node.
> We should just trust the OPPs provided by the EL3.
> 
> Signed-off-by: Abel Vesa <abel.vesa@nxp.com>
> ---
>   drivers/devfreq/imx8m-ddrc.c | 49 ++----------------------------------
>   1 file changed, 2 insertions(+), 47 deletions(-)
> 
> diff --git a/drivers/devfreq/imx8m-ddrc.c b/drivers/devfreq/imx8m-ddrc.c
> index 3a6c04ba4f2e..33de83acfd8b 100644
> --- a/drivers/devfreq/imx8m-ddrc.c
> +++ b/drivers/devfreq/imx8m-ddrc.c
> @@ -333,38 +333,9 @@ static int imx8m_ddrc_init_freq_info(struct device *dev)
>   		if (freq->dram_core_parent_index == 2 &&
>   				freq->dram_alt_parent_index == 0)
>   			return -ENODEV;
> -	}
> -
> -	return 0;
> -}
> -
> -static int imx8m_ddrc_check_opps(struct device *dev)
> -{
> -	struct imx8m_ddrc *priv = dev_get_drvdata(dev);
> -	struct imx8m_ddrc_freq *freq_info;
> -	struct dev_pm_opp *opp;
> -	unsigned long freq;
> -	int i, opp_count;
> -
> -	/* Enumerate DT OPPs and disable those not supported by firmware */
> -	opp_count = dev_pm_opp_get_opp_count(dev);
> -	if (opp_count < 0)
> -		return opp_count;
> -	for (i = 0, freq = 0; i < opp_count; ++i, ++freq) {
> -		opp = dev_pm_opp_find_freq_ceil(dev, &freq);
> -		if (IS_ERR(opp)) {
> -			dev_err(dev, "Failed enumerating OPPs: %ld\n",
> -				PTR_ERR(opp));
> -			return PTR_ERR(opp);
> -		}
> -		dev_pm_opp_put(opp);
>   
> -		freq_info = imx8m_ddrc_find_freq(priv, freq);
> -		if (!freq_info) {
> -			dev_info(dev, "Disable unsupported OPP %luHz %luMT/s\n",
> -					freq, DIV_ROUND_CLOSEST(freq, 250000));
> -			dev_pm_opp_disable(dev, freq);
> -		}
> +		if (dev_pm_opp_add(dev, freq->rate * 250000, 0))
> +			return -ENODEV;
>   	}
>   
>   	return 0;
> @@ -372,7 +343,6 @@ static int imx8m_ddrc_check_opps(struct device *dev)
>   
>   static void imx8m_ddrc_exit(struct device *dev)
>   {
> -	dev_pm_opp_of_remove_table(dev);
>   }
>   
>   static int imx8m_ddrc_probe(struct platform_device *pdev)
> @@ -419,16 +389,6 @@ static int imx8m_ddrc_probe(struct platform_device *pdev)
>   		return ret;
>   	}
>   
> -	ret = dev_pm_opp_of_add_table(dev);
> -	if (ret < 0) {
> -		dev_err(dev, "failed to get OPP table\n");
> -		return ret;
> -	}
> -
> -	ret = imx8m_ddrc_check_opps(dev);
> -	if (ret < 0)
> -		goto err;

In the devfreq_add_device(), if devfreq->profile->freq_table is NULL,
set_freq_table() function fill out the devfreq->profile->freq_table by 
using the OPP information.

After this patch, devfreq->profile.freq_table is NULL and there are no 
any OPP entries for this device, I think that this driver cannot add 
devfreq device without any frequency information. Is it working without 
any device frequency information?

> -
>   	priv->profile.polling_ms = 1000;
>   	priv->profile.target = imx8m_ddrc_target;
>   	priv->profile.get_dev_status = imx8m_ddrc_get_dev_status;
> @@ -441,13 +401,8 @@ static int imx8m_ddrc_probe(struct platform_device *pdev)
>   	if (IS_ERR(priv->devfreq)) {
>   		ret = PTR_ERR(priv->devfreq);
>   		dev_err(dev, "failed to add devfreq device: %d\n", ret);
> -		goto err;
>   	}
>   
> -	return 0;
> -
> -err:
> -	dev_pm_opp_of_remove_table(dev);
>   	return ret;
>   }
>   
>

Patch
diff mbox series

diff --git a/drivers/devfreq/imx8m-ddrc.c b/drivers/devfreq/imx8m-ddrc.c
index 3a6c04ba4f2e..33de83acfd8b 100644
--- a/drivers/devfreq/imx8m-ddrc.c
+++ b/drivers/devfreq/imx8m-ddrc.c
@@ -333,38 +333,9 @@  static int imx8m_ddrc_init_freq_info(struct device *dev)
 		if (freq->dram_core_parent_index == 2 &&
 				freq->dram_alt_parent_index == 0)
 			return -ENODEV;
-	}
-
-	return 0;
-}
-
-static int imx8m_ddrc_check_opps(struct device *dev)
-{
-	struct imx8m_ddrc *priv = dev_get_drvdata(dev);
-	struct imx8m_ddrc_freq *freq_info;
-	struct dev_pm_opp *opp;
-	unsigned long freq;
-	int i, opp_count;
-
-	/* Enumerate DT OPPs and disable those not supported by firmware */
-	opp_count = dev_pm_opp_get_opp_count(dev);
-	if (opp_count < 0)
-		return opp_count;
-	for (i = 0, freq = 0; i < opp_count; ++i, ++freq) {
-		opp = dev_pm_opp_find_freq_ceil(dev, &freq);
-		if (IS_ERR(opp)) {
-			dev_err(dev, "Failed enumerating OPPs: %ld\n",
-				PTR_ERR(opp));
-			return PTR_ERR(opp);
-		}
-		dev_pm_opp_put(opp);
 
-		freq_info = imx8m_ddrc_find_freq(priv, freq);
-		if (!freq_info) {
-			dev_info(dev, "Disable unsupported OPP %luHz %luMT/s\n",
-					freq, DIV_ROUND_CLOSEST(freq, 250000));
-			dev_pm_opp_disable(dev, freq);
-		}
+		if (dev_pm_opp_add(dev, freq->rate * 250000, 0))
+			return -ENODEV;
 	}
 
 	return 0;
@@ -372,7 +343,6 @@  static int imx8m_ddrc_check_opps(struct device *dev)
 
 static void imx8m_ddrc_exit(struct device *dev)
 {
-	dev_pm_opp_of_remove_table(dev);
 }
 
 static int imx8m_ddrc_probe(struct platform_device *pdev)
@@ -419,16 +389,6 @@  static int imx8m_ddrc_probe(struct platform_device *pdev)
 		return ret;
 	}
 
-	ret = dev_pm_opp_of_add_table(dev);
-	if (ret < 0) {
-		dev_err(dev, "failed to get OPP table\n");
-		return ret;
-	}
-
-	ret = imx8m_ddrc_check_opps(dev);
-	if (ret < 0)
-		goto err;
-
 	priv->profile.polling_ms = 1000;
 	priv->profile.target = imx8m_ddrc_target;
 	priv->profile.get_dev_status = imx8m_ddrc_get_dev_status;
@@ -441,13 +401,8 @@  static int imx8m_ddrc_probe(struct platform_device *pdev)
 	if (IS_ERR(priv->devfreq)) {
 		ret = PTR_ERR(priv->devfreq);
 		dev_err(dev, "failed to add devfreq device: %d\n", ret);
-		goto err;
 	}
 
-	return 0;
-
-err:
-	dev_pm_opp_of_remove_table(dev);
 	return ret;
 }