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From: Grygorii Strashko <grygorii.strashko@ti.com>
To: "David S. Miller" <davem@davemloft.net>, <netdev@vger.kernel.org>,
	Jakub Kicinski <kuba@kernel.org>,
	Vignesh Raghavendra <vigneshr@ti.com>
Cc: Sekhar Nori <nsekhar@ti.com>, <linux-kernel@vger.kernel.org>,
	<linux-omap@vger.kernel.org>,
	Murali Karicheri <m-karicheri2@ti.com>,
	Grygorii Strashko <grygorii.strashko@ti.com>
Subject: [PATCH net-next 6/8] net: ethernet: ti: am65-cpsw: keep active if cpts enabled
Date: Thu, 1 Oct 2020 13:52:56 +0300	[thread overview]
Message-ID: <20201001105258.2139-7-grygorii.strashko@ti.com> (raw)
In-Reply-To: <20201001105258.2139-1-grygorii.strashko@ti.com>

Some K3 CPSW NUSS instances can lose context after PM runtime ON->OFF->ON
transition depending on integration (including all submodules: CPTS, MDIO,
etc), like J721E Main CPSW (CPSW9G).

In case CPTS is enabled it's initialized during probe and does not expect
to be reset. Hence, keep K3 CPSW active by forbidding PM runtime if CPTS is
enabled.

Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
---
 drivers/net/ethernet/ti/am65-cpsw-nuss.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/net/ethernet/ti/am65-cpsw-nuss.c b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
index fecaf6b8270f..0bc0eec46709 100644
--- a/drivers/net/ethernet/ti/am65-cpsw-nuss.c
+++ b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
@@ -1727,6 +1727,13 @@ static int am65_cpsw_init_cpts(struct am65_cpsw_common *common)
 		return ret;
 	}
 	common->cpts = cpts;
+	/* Forbid PM runtime if CPTS is running.
+	 * K3 CPSWxG modules may completely lose context during ON->OFF
+	 * transitions depending on integration.
+	 * AM65x/J721E MCU CPSW2G: false
+	 * J721E MAIN_CPSW9G: true
+	 */
+	pm_runtime_forbid(dev);
 
 	return 0;
 }
-- 
2.17.1


  parent reply	other threads:[~2020-10-01 10:54 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-01 10:52 [PATCH net-next 0/8] net: ethernet: ti: am65-cpsw: add multi port support in mac-only mode Grygorii Strashko
2020-10-01 10:52 ` [PATCH net-next 1/8] net: ethernet: ti: am65-cpsw: move ale selection in pdata Grygorii Strashko
2020-10-01 10:52 ` [PATCH net-next 2/8] net: ethernet: ti: am65-cpsw: move free desc queue mode " Grygorii Strashko
2020-10-01 10:52 ` [PATCH net-next 3/8] net: ethernet: ti: am65-cpsw: use cppi5_desc_is_tdcm() Grygorii Strashko
2020-10-01 10:52 ` [PATCH net-next 4/8] net: ethernet: ti: cpsw_ale: add cpsw_ale_vlan_del_modify() Grygorii Strashko
2020-10-01 10:52 ` [PATCH net-next 5/8] net: ethernet: ti: am65-cpsw: fix vlan offload for multi mac mode Grygorii Strashko
2020-10-01 10:52 ` Grygorii Strashko [this message]
2020-10-01 10:52 ` [PATCH net-next 7/8] net: ethernet: ti: am65-cpsw: prepare xmit/rx path for multi-port devices in mac-only mode Grygorii Strashko
2020-10-03  2:09   ` David Miller
2020-10-05 10:28     ` Grygorii Strashko
2020-10-01 10:52 ` [PATCH net-next 8/8] net: ethernet: ti: am65-cpsw: add multi port support " Grygorii Strashko
2020-10-01 23:08 ` [PATCH net-next 0/8] " Jakub Kicinski
2020-10-02  9:56   ` Grygorii Strashko
2020-10-02 23:04     ` Jakub Kicinski
2020-10-02 23:07       ` Jakub Kicinski
2020-10-05 10:16         ` Grygorii Strashko

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