netdev - [PATCH net-next v2 6/9] net: ethernet: ti: am65-cpsw: keep active if cpts enabled

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20201015231913.30280-7-grygorii.strashko@ti.com>
Date:   Fri, 16 Oct 2020 02:19:10 +0300
From:   Grygorii Strashko <grygorii.strashko@...com>
To:     "David S. Miller" <davem@...emloft.net>, <netdev@...r.kernel.org>,
        Jakub Kicinski <kuba@...nel.org>,
        Vignesh Raghavendra <vigneshr@...com>
CC:     Sekhar Nori <nsekhar@...com>, <linux-kernel@...r.kernel.org>,
        <linux-omap@...r.kernel.org>,
        Murali Karicheri <m-karicheri2@...com>,
        Grygorii Strashko <grygorii.strashko@...com>
Subject: [PATCH net-next v2 6/9] net: ethernet: ti: am65-cpsw: keep active if cpts enabled

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@...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