diff mbox series

[net-next,v3,19/19] net: ravb: Add runtime PM support

Message ID 20240105082339.1468817-20-claudiu.beznea.uj@bp.renesas.com (mailing list archive)
State Changes Requested
Delegated to: Netdev Maintainers
Headers show
Series net: ravb: Add suspend to RAM and runtime PM support for RZ/G3S | expand

Checks

Context Check Description
netdev/series_format fail Series longer than 15 patches (and no cover letter)
netdev/tree_selection success Clearly marked for net-next
netdev/ynl success Generated files up to date; no warnings/errors; no diff in generated;
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 1113 this patch: 1113
netdev/cc_maintainers success CCed 0 of 0 maintainers
netdev/build_clang success Errors and warnings before: 1140 this patch: 1140
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 1140 this patch: 1140
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 139 lines checked
netdev/build_clang_rust success No Rust files in patch. Skipping build
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0

Commit Message

Claudiu Beznea Jan. 5, 2024, 8:23 a.m. UTC 
From: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>

Add runtime PM support for the ravb driver. As the driver is used by
different IP variants, with different behaviors, to be able to have the
runtime PM support available for all devices, the preparatory commits
moved all the resources parsing and allocations in the driver's probe
function and kept the settings for ravb_open(). This is due to the fact
that on some IP variants-platforms tuples disabling/enabling the clocks
will switch the IP to the reset operation mode where registers' content is
lost and reconfiguration needs to be done. For this the rabv_open()
function enables the clocks, switches the IP to configuration mode, applies
all the registers settings and switches the IP to the operational mode. At
the end of ravb_open() IP is ready to send/receive data.

In ravb_close() necessary reverts are done (compared with ravb_open()), the
IP is switched to reset mode and clocks are disabled.

The ethtool APIs or IOCTLs that might execute while the interface is down
are either cached (and applied in ravb_open()) or rejected (as at that time
the IP is in reset mode). Keeping the IP in the reset mode also increases
the power saved (according to the hardware manual).

Reviewed-by: Sergey Shtylyov <s.shtylyov@omp.ru>
Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
---

Changes in v3:
- this was patch 21/21 in v2
- collected tags
- fixed typos in patch description

Changes in v2:
- keep RPM support for all platforms

 drivers/net/ethernet/renesas/ravb_main.c | 54 ++++++++++++++++++++++--
 1 file changed, 50 insertions(+), 4 deletions(-)

Comments

Sergey Shtylyov Jan. 9, 2024, 7:53 p.m. UTC | #1 
On 1/5/24 11:23 AM, Claudiu wrote:

> From: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
> 
> Add runtime PM support for the ravb driver. As the driver is used by
> different IP variants, with different behaviors, to be able to have the
> runtime PM support available for all devices, the preparatory commits
> moved all the resources parsing and allocations in the driver's probe
> function and kept the settings for ravb_open(). This is due to the fact
> that on some IP variants-platforms tuples disabling/enabling the clocks
> will switch the IP to the reset operation mode where registers' content is
> lost and reconfiguration needs to be done. For this the rabv_open()
> function enables the clocks, switches the IP to configuration mode, applies
> all the registers settings and switches the IP to the operational mode. At
> the end of ravb_open() IP is ready to send/receive data.
> 
> In ravb_close() necessary reverts are done (compared with ravb_open()), the
> IP is switched to reset mode and clocks are disabled.
> 
> The ethtool APIs or IOCTLs that might execute while the interface is down
> are either cached (and applied in ravb_open()) or rejected (as at that time
> the IP is in reset mode). Keeping the IP in the reset mode also increases
> the power saved (according to the hardware manual).
> 
> Reviewed-by: Sergey Shtylyov <s.shtylyov@omp.ru>
> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
[...]

> diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
> index e909960fbc30..e99351fe8d7f 100644
> --- a/drivers/net/ethernet/renesas/ravb_main.c
> +++ b/drivers/net/ethernet/renesas/ravb_main.c
[...]
> @@ -2233,7 +2243,14 @@ static int ravb_close(struct net_device *ndev)
>  	ravb_get_stats(ndev);
>  
>  	/* Set reset mode. */
> -	return ravb_set_opmode(ndev, CCC_OPC_RESET);
> +	error = ravb_set_opmode(ndev, CCC_OPC_RESET);
> +	if (error)
> +		return error;
> +
> +	pm_runtime_mark_last_busy(dev);
> +	pm_runtime_put_autosuspend(dev);

   BTW, doesn't make sense to check/return the result?

> +
> +	return 0;
>  }
>  
>  static int ravb_hwtstamp_get(struct net_device *ndev, struct ifreq *req)
[...]

MBR, Sergey
Claudiu Beznea Jan. 10, 2024, 1:23 p.m. UTC | #2 
On 09.01.2024 21:53, Sergey Shtylyov wrote:
> On 1/5/24 11:23 AM, Claudiu wrote:
> 
>> From: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
>>
>> Add runtime PM support for the ravb driver. As the driver is used by
>> different IP variants, with different behaviors, to be able to have the
>> runtime PM support available for all devices, the preparatory commits
>> moved all the resources parsing and allocations in the driver's probe
>> function and kept the settings for ravb_open(). This is due to the fact
>> that on some IP variants-platforms tuples disabling/enabling the clocks
>> will switch the IP to the reset operation mode where registers' content is
>> lost and reconfiguration needs to be done. For this the rabv_open()
>> function enables the clocks, switches the IP to configuration mode, applies
>> all the registers settings and switches the IP to the operational mode. At
>> the end of ravb_open() IP is ready to send/receive data.
>>
>> In ravb_close() necessary reverts are done (compared with ravb_open()), the
>> IP is switched to reset mode and clocks are disabled.
>>
>> The ethtool APIs or IOCTLs that might execute while the interface is down
>> are either cached (and applied in ravb_open()) or rejected (as at that time
>> the IP is in reset mode). Keeping the IP in the reset mode also increases
>> the power saved (according to the hardware manual).
>>
>> Reviewed-by: Sergey Shtylyov <s.shtylyov@omp.ru>
>> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
> [...]
> 
>> diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
>> index e909960fbc30..e99351fe8d7f 100644
>> --- a/drivers/net/ethernet/renesas/ravb_main.c
>> +++ b/drivers/net/ethernet/renesas/ravb_main.c
> [...]
>> @@ -2233,7 +2243,14 @@ static int ravb_close(struct net_device *ndev)
>>  	ravb_get_stats(ndev);
>>  
>>  	/* Set reset mode. */
>> -	return ravb_set_opmode(ndev, CCC_OPC_RESET);
>> +	error = ravb_set_opmode(ndev, CCC_OPC_RESET);
>> +	if (error)
>> +		return error;
>> +
>> +	pm_runtime_mark_last_busy(dev);
>> +	pm_runtime_put_autosuspend(dev);
> 
>    BTW, doesn't make sense to check/return the result?

Most users of this are not checking return code, I followed this pattern,
too. But, yes, would be better to check it, AFAICT.

> 
>> +
>> +	return 0;
>>  }
>>  
>>  static int ravb_hwtstamp_get(struct net_device *ndev, struct ifreq *req)
> [...]
> 
> MBR, Sergey
diff mbox series

Patch

diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
index e909960fbc30..e99351fe8d7f 100644
--- a/drivers/net/ethernet/renesas/ravb_main.c
+++ b/drivers/net/ethernet/renesas/ravb_main.c
@@ -1840,16 +1840,21 @@  static int ravb_open(struct net_device *ndev)
 {
 	struct ravb_private *priv = netdev_priv(ndev);
 	const struct ravb_hw_info *info = priv->info;
+	struct device *dev = &priv->pdev->dev;
 	int error;
 
 	napi_enable(&priv->napi[RAVB_BE]);
 	if (info->nc_queues)
 		napi_enable(&priv->napi[RAVB_NC]);
 
+	error = pm_runtime_resume_and_get(dev);
+	if (error < 0)
+		goto out_napi_off;
+
 	/* Set AVB config mode */
 	error = ravb_set_config_mode(ndev);
 	if (error)
-		goto out_napi_off;
+		goto out_rpm_put;
 
 	ravb_set_delay_mode(ndev);
 	ravb_write(ndev, priv->desc_bat_dma, DBAT);
@@ -1883,6 +1888,9 @@  static int ravb_open(struct net_device *ndev)
 	ravb_stop_dma(ndev);
 out_set_reset:
 	ravb_set_opmode(ndev, CCC_OPC_RESET);
+out_rpm_put:
+	pm_runtime_mark_last_busy(dev);
+	pm_runtime_put_autosuspend(dev);
 out_napi_off:
 	if (info->nc_queues)
 		napi_disable(&priv->napi[RAVB_NC]);
@@ -2184,6 +2192,8 @@  static int ravb_close(struct net_device *ndev)
 	struct ravb_private *priv = netdev_priv(ndev);
 	const struct ravb_hw_info *info = priv->info;
 	struct ravb_tstamp_skb *ts_skb, *ts_skb2;
+	struct device *dev = &priv->pdev->dev;
+	int error;
 
 	netif_tx_stop_all_queues(ndev);
 
@@ -2233,7 +2243,14 @@  static int ravb_close(struct net_device *ndev)
 	ravb_get_stats(ndev);
 
 	/* Set reset mode. */
-	return ravb_set_opmode(ndev, CCC_OPC_RESET);
+	error = ravb_set_opmode(ndev, CCC_OPC_RESET);
+	if (error)
+		return error;
+
+	pm_runtime_mark_last_busy(dev);
+	pm_runtime_put_autosuspend(dev);
+
+	return 0;
 }
 
 static int ravb_hwtstamp_get(struct net_device *ndev, struct ifreq *req)
@@ -2725,6 +2742,8 @@  static int ravb_probe(struct platform_device *pdev)
 	clk_prepare(priv->refclk);
 
 	platform_set_drvdata(pdev, ndev);
+	pm_runtime_set_autosuspend_delay(&pdev->dev, 100);
+	pm_runtime_use_autosuspend(&pdev->dev);
 	pm_runtime_enable(&pdev->dev);
 	error = pm_runtime_resume_and_get(&pdev->dev);
 	if (error < 0)
@@ -2830,6 +2849,9 @@  static int ravb_probe(struct platform_device *pdev)
 	netdev_info(ndev, "Base address at %#x, %pM, IRQ %d.\n",
 		    (u32)ndev->base_addr, ndev->dev_addr, ndev->irq);
 
+	pm_runtime_mark_last_busy(&pdev->dev);
+	pm_runtime_put_autosuspend(&pdev->dev);
+
 	return 0;
 
 out_napi_del:
@@ -2847,6 +2869,7 @@  static int ravb_probe(struct platform_device *pdev)
 	pm_runtime_put(&pdev->dev);
 out_rpm_disable:
 	pm_runtime_disable(&pdev->dev);
+	pm_runtime_dont_use_autosuspend(&pdev->dev);
 	clk_unprepare(priv->refclk);
 out_reset_assert:
 	reset_control_assert(rstc);
@@ -2860,6 +2883,12 @@  static void ravb_remove(struct platform_device *pdev)
 	struct net_device *ndev = platform_get_drvdata(pdev);
 	struct ravb_private *priv = netdev_priv(ndev);
 	const struct ravb_hw_info *info = priv->info;
+	struct device *dev = &priv->pdev->dev;
+	int error;
+
+	error = pm_runtime_resume_and_get(dev);
+	if (error < 0)
+		return;
 
 	unregister_netdev(ndev);
 	if (info->nc_queues)
@@ -2871,8 +2900,9 @@  static void ravb_remove(struct platform_device *pdev)
 	dma_free_coherent(ndev->dev.parent, priv->desc_bat_size, priv->desc_bat,
 			  priv->desc_bat_dma);
 
-	pm_runtime_put_sync(&pdev->dev);
+	pm_runtime_put_sync_suspend(&pdev->dev);
 	pm_runtime_disable(&pdev->dev);
+	pm_runtime_dont_use_autosuspend(dev);
 	clk_unprepare(priv->refclk);
 	reset_control_assert(priv->rstc);
 	free_netdev(ndev);
@@ -2954,6 +2984,10 @@  static int ravb_suspend(struct device *dev)
 	if (ret)
 		return ret;
 
+	ret = pm_runtime_force_suspend(&priv->pdev->dev);
+	if (ret)
+		return ret;
+
 reset_assert:
 	return reset_control_assert(priv->rstc);
 }
@@ -2976,16 +3010,28 @@  static int ravb_resume(struct device *dev)
 		ret = ravb_wol_restore(ndev);
 		if (ret)
 			return ret;
+	} else {
+		ret = pm_runtime_force_resume(dev);
+		if (ret)
+			return ret;
 	}
 
 	/* Reopening the interface will restore the device to the working state. */
 	ret = ravb_open(ndev);
 	if (ret < 0)
-		return ret;
+		goto out_rpm_put;
 
 	ravb_set_rx_mode(ndev);
 	netif_device_attach(ndev);
 
+	return 0;
+
+out_rpm_put:
+	if (!priv->wol_enabled) {
+		pm_runtime_mark_last_busy(dev);
+		pm_runtime_put_autosuspend(dev);
+	}
+
 	return ret;
 }