diff mbox series

[12/13] net: ravb: Assert/deassert reset on suspend/resume

Message ID 20231120084606.4083194-13-claudiu.beznea.uj@bp.renesas.com (mailing list archive)
State Superseded
Delegated to: Geert Uytterhoeven
Headers show
Series net: ravb: Add suspend to RAM and runtime PM support for RZ/G3S | expand

Commit Message

claudiu beznea Nov. 20, 2023, 8:46 a.m. UTC 
From: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>

RZ/G3S can go to deep sleep states where power to most of the SoC parts
is off. When resumming from such state the Ethernet controller needs to be
reinitialized. Deasserting the reset signal for it should also be done.
Thus add reset assert/deassert on suspend/resume functions.

On resume function the de-assert was not reverted in case of failures to
give user a chance to restore the interface (e.g. bringing down/up the
interface) in case suspend/resume fails.

Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
---
 drivers/net/ethernet/renesas/ravb_main.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

Comments

Sergey Shtylyov Nov. 21, 2023, 7:13 p.m. UTC | #1 
On 11/20/23 11:46 AM, Claudiu wrote:

> From: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
> 
> RZ/G3S can go to deep sleep states where power to most of the SoC parts
> is off. When resumming from such state the Ethernet controller needs to be

   Resuming.

> reinitialized. Deasserting the reset signal for it should also be done.
> Thus add reset assert/deassert on suspend/resume functions.

   Firefox' spell checker trips over deassert[ing] and you have |de-assert"
below:

> On resume function the de-assert was not reverted in case of failures to
> give user a chance to restore the interface (e.g. bringing down/up the
> interface) in case suspend/resume fails.

   I'm not seeing us reverting anything on the resume failure...

> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>

Reviewed-by: Sergey Shtylyov <s.shtylyov@omp.ru>

[...]

MBR, Sergey
Sergey Shtylyov Nov. 22, 2023, 4:41 p.m. UTC | #2 
On 11/21/23 10:13 PM, Sergey Shtylyov wrote:
[...]

>> From: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
[...]

>> reinitialized. Deasserting the reset signal for it should also be done.
>> Thus add reset assert/deassert on suspend/resume functions.
> 
>    Firefox' spell checker trips over deassert[ing] and you have |de-assert"

   s/Firefox/Thunderbird/. :-)

[...]

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 a93b3d6b1863..f4634ac0c972 100644
--- a/drivers/net/ethernet/renesas/ravb_main.c
+++ b/drivers/net/ethernet/renesas/ravb_main.c
@@ -2972,7 +2972,10 @@  static int ravb_suspend(struct device *dev)
 	if (priv->info->ccc_gac)
 		ravb_ptp_stop(ndev);
 
-	return ret;
+	if (priv->wol_enabled)
+		return ret;
+
+	return reset_control_assert(priv->rstc);
 }
 
 static int ravb_resume(struct device *dev)
@@ -2980,7 +2983,11 @@  static int ravb_resume(struct device *dev)
 	struct net_device *ndev = dev_get_drvdata(dev);
 	struct ravb_private *priv = netdev_priv(ndev);
 	const struct ravb_hw_info *info = priv->info;
-	int ret = 0;
+	int ret;
+
+	ret = reset_control_deassert(priv->rstc);
+	if (ret)
+		return ret;
 
 	/* If WoL is enabled set reset mode to rearm the WoL logic */
 	if (priv->wol_enabled)