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[net-next,v2,06/21] net: ravb: Assert/de-assert reset on suspend/resume

Message ID 20231214114600.2451162-7-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State Superseded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 Dec. 14, 2023, 11:45 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 resuming from such a state, the Ethernet controller needs to be
reinitialized. De-asserting the reset signal for it should also be done.
Thus, add reset assert/de-assert on suspend/resume functions.

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

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

Changes in v2:
- fixed typos in patch description and subject
- on ravb_suspend() assert the reset signal in case interface is down;
  due to this the Sergey's Rb tag was left aside in this version

 drivers/net/ethernet/renesas/ravb_main.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

Comments

Sergey Shtylyov Dec. 14, 2023, 8:58 p.m. UTC | #1 
On 12/14/23 2:45 PM, 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 resuming from such a state, the Ethernet controller needs to be
> reinitialized. De-asserting the reset signal for it should also be done.
> Thus, add reset assert/de-assert on suspend/resume functions.
> 
> On the resume function, the de-assert was not reverted in case of failures
> to give the user a chance to restore the interface (e.g., bringing down/up
> the interface) in case suspend/resume failed.
> 
> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>

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

[...]

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 5a57383762e7..9a618d8dbfcd 100644
--- a/drivers/net/ethernet/renesas/ravb_main.c
+++ b/drivers/net/ethernet/renesas/ravb_main.c
@@ -2985,7 +2985,7 @@  static int ravb_suspend(struct device *dev)
 	int ret;
 
 	if (!netif_running(ndev))
-		return 0;
+		goto reset_assert;
 
 	netif_device_detach(ndev);
 
@@ -2997,7 +2997,11 @@  static int ravb_suspend(struct device *dev)
 	if (priv->info->ccc_gac)
 		ravb_ptp_stop(ndev);
 
-	return ret;
+	if (priv->wol_enabled)
+		return ret;
+
+reset_assert:
+	return reset_control_assert(priv->rstc);
 }
 
 static int ravb_resume(struct device *dev)
@@ -3005,7 +3009,11 @@  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) {